Last update : 24 January 2018

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Faculties
Prof. Takayuki HOSON (hoson@sci.osaka-cu.ac.jp)
Assoc. Prof. Kazuyuki WAKABAYASHI (wakaba@sci.osaka-cu.ac.jp)
Assoc. Prof. Kouichi SOGA (soga@sci.osaka-cu.ac.jp)

Overview of Research
  Plants must have a suitable size and shape, for performing an efficient life. We have been studying the mechanisms of growth regulation and morphogenesis in higher plants. Plant cells are surrounded by well-developed cell walls, which provide the protoplasts with the structural rigidity. Therefore, the cell wall determines most directly the size and shape of plant cells. During plant development, the mechanical properties of the cell wall dramatically change through the structural modifications. The cell wall plays an important role not only in the regulation of plant growth and morphogenesis, but also in the regulation of other various functions in plants.
  The physiological functions of the cell wall are sustained by the active metabolic turnover of its constituents. The metabolism of cell wall constituents is fundamentally directed by a genetic program. At the same time, plants are surrounded by a variety of environmental signals, which greatly modify the genetic program. Actually, when plants are subjected to the environmental signals, the mechanical properties of the cell wall are prominently changed. Plant hormones are involved in transduction of perceived environmental signals. The hormones also play a role as a mediator of gene functions. Thus, processes of growth regulation and morphogenesis, and therefore of regulation of various plant functions, are summarized as the following series of events:

  Environmental signals → Hormones → Genes → Hormones → Cell walls →

  We are interested in mechanisms of the whole of the events, and studying them with a combination of physiological, biochemical, molecular biological, morphological, and physical approaches. One of themes we are currently focusing is the mechanism of gravity responses in plants. We are analyzing them with both space and ground-based experiments.


English Publications (Since 1998)

2018

Soga K, Wakabayashi K and Hoson T (2018) Growth and cortical microtubule dynamics in shoot organs under microgravity and hypergravity conditions. Plant Signal. Behav. 13: e1422468. doi: 10.1080/15592324.2017.1422468

Soga K, Yamazaki C, Kamada M, Tanigawa N, Kasahara H, Yano S, Kojo KH, Kutsuna N, Kato T, Hashimoto T, Kotake T, Wakabayashi K and Hoson T (2018) Modification of growth anisotropy and cortical microtubule dynamics in Arabidopsis hypocotyls grown under microgravity conditions in space. Physiol. Plant. 162: 135-144. doi: 10.1111/ppl.12640

2017


Wakabayashi K, Soga K, Hoson T, Kotake T, Kojima M, Sakakibara H, Yamazaki T, Higashibata A, Ishioka N, Shimazu T and Kamada M (2017) Persistence of plant hormone levels in rice shoots grown under microgravity conditions in space: its relationship to maintenance of shoot growth. Physiol. Plant. 161: 285-293. doi: 10.1111/ppl.12591

2016


Murakami M, Soga K, Kotake T, Kato T, Hashimoto T, Wakabayashi K and Hoson T (2016) Roles of MAP65-1 and BPP1 in gravity resistance of Arabidopsis hypocotyls. Biol. Sci. Space, 30: 1-7. doi: 10.2187/bss.30.1

Mabuchi A, Soga K, Wakabayashi K and Hoson T (2016) Phenotypic screening of Arabidopsis T-DNA insertion lines for cell wall mechanical properties revealed ANTHOCYANINLESS2, a cell wall-related gene. J. Plant Physiol. 191: 29-35. doi: 10.1016/j.jplph.2015.11.011

2015


Wakabayashi K, Soga K, Hoson T, Kotake T, Yamazaki T, Higashibata A, Ishioka N, Shimazu T, Fukui K,Osada I, Kasahara H and Kamada M (2015) Suppression of hydroxycinnamate network formation in cell walls of rice shoots grown under microgravity conditions in space. PLoS ONE 10: e0137992. doi: 10.1371/journal.pone.0137992

Hossain MT, Soga K, Wakabayashi K and Hoson T (2015) Effects of lead toxicity on growth and cell wall extensibility in rice seedlings. Bangladesh J. Bot. 44(2): 333-336.

Soga K, Yano S, Matsumoto S, and Hoson T (2015) Hypergravity experiments to evaluate gravity resistance mechanisms in plants. In Plant Gravitropism: Methods and Protocols (Ed. Blancaflor EB). Methods Mol. Biol. p. 307-319. doi: 10.1007/978-1-4939-2697-8_21

Hoson T and Wakabayashi K (2015) Role of the plant cell wall in gravity resistance. Phytochemistry 112: 84-90.
doi: 10.1016/j.phytochem.2014.08.022


Kittang Jost A-I, Hoson T, and Iversen T-H (2015) The utilization of plant facilities on the international space station - The composition, growth, and development of plant cell walls under microgravity conditions. Plants 4: 44-62. doi: 10.3390/plants4010044

2014


Soga K, Biology Club, Kurita A, Yano S, Ichikawa T, Kamada M and Takaoki M (2014) Growth and morphogenesis of azuki bean seedlings in space during SSAF2013 program. Biol. Sci. Space 28: 6-11. doi: 10.2187/bss.28.6

Hoson T (2014) Plant growth and morphogenesis under different gravity conditions: Relevance to plant life in space. Life 4: 205-216. doi: 10.3390/life4020205

Hoson T, Soga K, Wakabayashi K, Hashimoto T, Karahara I, Yano S, Tanigaki F, Shimazu T, Kasahara H, Masuda D and Kamisaka S (2014) Growth stimulation in inflorescences of an Arabidopsis tubulin mutant under microgravity conditions in space. Plant Biol.16(S1):91-96. doi: 10.1111/plb.12099

2013


Soga K (2013) Resistance of plants to the gravitational force. J. Plant Res. 126: 589-596. doi: 10.1007/s10265-013-0572-4

Yano S, Kasahara H, Masuda D, Tanigaki F, Shimazu T, Suzuki H, Karahara,I, Soga K, Hoson T, Tayama I, Tsuchiya Y and Kamisaka S (2013) Improvements in and actual performance of the Plant Experiment Unit onboard Kibo, the Japanese Experiment Module on the International Space Station. Adv. Space Res. 51: 780-788. doi: 10.1016/j.asr2012.10.002

Zhang Y, Soga K, Wakabayashi K and Hoson T (2013) Effects of gravistimuli on osmoregulation in azuki bean epicotyls. Adv. Space Res. 51: 458-464. doi: 10.1016/j.asr2012.09.013

2012


Yano S, Masuda D, Kasahara H, Omor K, Higashibata A, Asashima M, Ohnishi T, Yatagai F, Kamisaka S, Furusawa T, Higashitani A, Majima HJ, Nikawa T, Wakabayashi K, Takahashi H, Suzuki H, Shimazu T, Fukui K, Hattori A, Tanigaki F, Shirakawa M, Nakamura T, Yoshimura Y, Suzuki N and Ishioka N (2012) Excellent thermal control ability of Cell Biology Experiment Facility (CBEF) for ground based experiments and experiments onboard the Kibo Japanese experiment module of International Space Station. Biol. Sci. Space 26: 12-20. doi: 10.2187/bss.26.12

Hoson T, Akamatsu H, Soga K, Wakabayashi K, Hashimoto H, Yamashita M, Hasegawa K, Yano S, Omori K, Ishioka N, Matsumoto S, Kasahara H, Shimazu T, Baba SA and Hashimoto T (2012) Objectives, outlines, and preparation for the Resist Tubule space experiment to understand the mechanism of gravity resistance in plants. Aerospace Technol. Japan 10: Tp 1-5. doi:10.2322/tastj.10.Tp_1

Soga K, Kotake T, Wakabayashi K and Hoson T (2012) Changes in the transcript levels of microtubule-associated protein MAP65-1 during reorientation of cortical microtubules in azuki bean epicotyls. Acta Physiol. Plant. 34: 533-540. doi:10.1007/s11738-011-0850-5

Wakabayashi K, Soga K and Hoson T (2012) Phenylalanine ammonia-lyase and cell wall peroxidase are cooperatively involved in the extensive formation of ferulate network in cell walls of developing rice shoots. J. Plant Physiol. 169: 262-267. doi:10.1016/j.jplph.2011.10.002

2011


Hoson T, Takahashi A, Nikawa T, Fukui K, Ogawa S and Higashitani A (2011) Toward future space experiments for life sciences. Biol. Sci. Space 25: 21-24.

Wakabayashi K, Soga K and Hoson T (2011) Cell wall oxalate oxidase modifies the ferulate metabolism in cell walls of wheat shoots. J. Plant Physiol. 168: 1997-2000. doi:10.1016/j.plph..2011.05.010

Miedes E, Zarra I, Hoson T, Herbers K, Sonnewald U and Lorences EP (2011) Xyloglucan endotransglucosylase and cell wall extensibility. J. Plant Physiol. 168: 196-203.doi:10.1016/j.jplph.2010.06.029

2010


Soga K (2010) Gravity resistance in plants. Biol. Sci. Space 24: 129-134.doi: 10.2187/bss.24.129

Soga K, Yamaguchi A, Kotake T, Wakabayashi K and Hoson T (2010) Transient increase in the levels of γ-tubulin complex and katanin are responsible for reorientation by ethylene and hypergravity of cortical microtubules. Plant Signal. Behav. 5: 1480-1482. doi: 10.4161/psb.5.11.13561

Soga K, Yamaguchi A, Kotake T, Wakabayashi K and Hoson T (2010) 1-Aminocyclopropane-1-carboxylic acid (ACC)-induced reorientation of cortical microtubules is accompanied by a transient increase in the transcript levels of γ-tubulin complex and katanin genes in azuki bean epicotyls. J. Plant Physiol. 167: 1165-1171. doi:10.1016/j.jplph.2010.04.001

Hoson T, Matsumoto S, Soga K and Wakabayashi K (2010) Cortical microtubules are responsible for gravity resistance in plants. Plant Signal. Behav. 5: 752-754. doi: 10.4161/psb.5.6.11706

Hoson T (2010) Cellulose as the anti-gravitational polysaccharide. In Cellulose: Structure and Properties, Derivatives and Industrial Uses, Edited by Lejeune A and Deprez T, Nova Science Publishers, New York. p. 293-307.

Arai K, Wakabayashi K, Soga K and Hoson T (2010) Fucosylated high molecular mass but not non-fucosylated low molecular mass xyloglucans undergo an extensive depolymerization in cell walls of azuki bean epicotyls. J. Plant Physiol. 167: 800-804. doi:10.1016/j.jplph.2010.01002

Matsumoto S, Kumasaki S, Soga K, Wakabayashi K, Hashimoto T and Hoson T (2010) Gravity-induced modifications to development in hypocotyls of Arabidopsis tubulin mutants. Plant Physiol. 152: 918-926. doi:10.1104/pp.109.147330

2009


Hoson T and Fujii N (2009) Preface: Gravity responses and the cell wall in plants. Biol. Sci. Space 23: 113. doi: 10.2187/bss.23.113

Kamada M, Omori K, Yokoyama R, Nishitani K, Hoson T, Shimazu T and Ishioka N (2009) Preparation and outline of space-based studies on gravity responses and cell wall formation in plants. Biol. Sci. Space 23: 115-120. doi: 10.2187/bss.23.115

Hoson T, Soga K and Wakabayashi K (2009) Role of the cell wall-sustaining system in gravity resistance in plants. Biol. Sci. Space 23: 131-136. doi: 10.2187/bss.23.131

Wakabayashi K, Soga K and Hoson T (2009) Modification of cell wall architecture in gramineous plants under altered gravity conditions. Biol. Sci. Space 23: 137-142. doi: 10.2187/bss.23.137

Kotake T, Hirata N, Kitazawa K, Soga K and Tsumuraya Y (2009) Arabinogalactan-proteins in the evolution of gravity resistance in land plants. Biol. Sci. Space 23: 143-149. doi: 10.2187/bss.23.143

Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2009) Growth and cell wall properties in hypocotyls of Arabidopsis tua6 mutant under microgravity conditions in space. Biol. Sci. Space 23: 71-76. doi: 10.2187/bss.23.71

Soga K, Kotake T, Wakabayashi K, Kamisaka S and Hoson T (2009) The transcript level of katanin gene is increased transiently in response to changes in gravitational conditions in azuki bean epicotyls. Biol. Sci. Space 23: 23-28. doi: 10.2187/bss.23.23

Kamada M, Omori K, Nishitani K, Hoson T, Takeoka H, Shimazu T, Yoda S and Ishioka N (2009) Germination and growth test in four strains of Arabidopsis thaliana in the reference model of European Modular Cultivation System. J. Jpn. Soc. Microgravity Appl. 26: 249-254.

Wakabayashi K, Nakano S, Soga K and Hoson T (2009) Cell wall-bound peroxidase activity and lignin formation in azuki bean epicotyls grown under hypergravity conditions. J. Plant Physiol. 166: 947-954. doi:10.1016/j.jplph.2008.12.006

Ooume K, Inoue Y, Soga K, Wakabayashi K, Fujii S, Yamamoto R and Hoson T (2009) Cellular basis of growth suppression by submergence in azuki bean epicotyls. Ann. Bot. 103: 325-332. doi:10.1093/aob/mcn198

2008


Soga K, Kotake T, Wakabayashi K, Kamisaka S and Hoson T (2008) Transient increase in the transcript levels of γ-tubulin complex genes during reorientation of cortical microtubules by gravity in azuki bean (Vigna angularis) epicotyls. J. Plant Res. 121: 493-498. doi:10.1007/s10265-008-0179-3

Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2008) The Resist Wall experiment on EMCS. J. Gravit. Physiol. 15: 303-304.

Kimpara T, Aohara T, Soga K, Wakabayashi K, Hoson T, Tsumuraya Y and Kotake T (2008) β-1,3:1,4-Glucan synthase activity in rice seedlings under water. Ann. Bot. 102: 221-226. doi:10.1093/aob/mcn077

Ikushima T, Soga K, Hoson T and Shimmen T (2008) Role of xyloglucan in gravitropic bending of azuki bean epicotyl. Physiol. Plant. 132: 552-565. doi:10.1111/j.1399-3054.2007.01047.x

2007


Nakano S, Soga K, Wakabayashi K and Hoson T (2007) Different cell wall polysaccharides are responsible for gravity resistance in the upper and the basal regions of azuki bean epicotyls. Biol. Sci. Space 21: 113-116. doi: 10.2187/bss.21.113

Hoson T (2007) Preface: Cell Wall/Resist Wall Experiment in EMCS. Biol. Sci. Space 21: 47. doi: 10.2187/bss.21.47

Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2007) The Outline and Significance of the Resist Wall Experiment: Role of Microtubule-Membrane-Cell Wall Continuum in Gravity Resistance in Plants. Biol. Sci. Space 21: 56-61. doi: 10.2187/bss.21.56

Kamada M, Omori K, Nishitani K, Hoson T, Shimazu T and Ishioka N (2007) JAXA Space Plant Research on the ISS with European Modular Cultivation System. Biol. Sci. Space 21: 62-66. doi: 10.2187/bss.21.62

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2007) Effects of hypergravity on expression of XTH genes in azuki bean epicotyls. Physiol. Plant. 131: 332-340. doi:10.1111/j.1399-3054.2007.00949.x

Soga K, Arai K, Wakabayashi K, Kamisaka S and Hoson T (2007) Modifications of xyloglucan metabolism in azuki bean epicotyls under hypergravity conditions. Adv. Space Res. 39: 1204-1209. doi:10.1016/j.asr.2006.12.011

Koizumi T, Sakaki T, Usui S, Soga K, Wakabayashi K and Hoson T (2007) Changes in membrane lipid composition in azuki bean epicotyls under hypergravity conditions: Possible role of membrane sterols in gravity resistance. Adv. Space Res. 39: 1198-1203. doi:10.1016/j.asr.2007.02.040

Matsumoto S, Saito Y, Kumasaki S, Soga K, Wakabayashi K and Hoson T (2007) Up-regulation of expression of tubulin genes and roles of microtubules in hypergravity-induced growth modification in Arabidopsis hypocotyls. Adv. Space Res. 39: 1176-1181. doi:10.1016/j.asr.2007.03.074

Hossain MT, Soga K, Wakabayashi K, Kamisaka S, Fujii S, Yamamoto R and Hoson T (2007) Modification of chemical properties of cell walls by silicon and its role in regulation of the cell wall extensibility in oat leaves. J. Plant Physiol. 164: 385-393. doi:10.1016/j.jplph.2006.02.003

Lee EJ, Matsumura Y, Soga K, Hoson T and Koizumi N (2007) Glycosyl hydrolases of cell wall are induced by sugar starvation in Arabidopsis. Plant Cell Physiol. Plant Cell Physiol. 48: 405-413. doi:10.1093/pcp/pcm009

2006


Hoson T (2006) The mechanism and significance of gravity resistance in plants. J. Gravit. Physiol. 13: 97-100.

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2006) Hypergravity induces reorientation of cortical microtubules and modifies growth anisotropy in azuki bean epicotyls. Planta 224: 1485-1494. doi:10.1007/s00425-006-0319-8

Saito T, Soga K, Hoson T and Terashima I (2006) The bulk elastic modulus and the reversible properties of cell walls in developing Quercus leaves. Plant Cell Physiol. 46: 715-725. doi:10.1093/pcp/pcj042

Nakabayashi I, Karahara I, Tamaoki D, Masuda K, Wakasugi T, Yamada K, Soga K, Hoson T and Kamisaka S (2006) Hypergravity stimulus enhances primary xylem development and decreases mechanical properties of secondary cell walls in inflorescence stems of Arabidopsis thaliana. Ann. Bot. 97: 1083-1090. doi:10.1093/aob/mcl055

2005


Wakabayashi K, Soga K, Kamisaka S and Hoson T (2005) Increase in the level of arabinoxylan-hydroxycinnamate network in cell walls of wheat coleoptiles grown under continuous hypergravity conditions. Physiol. Plant. 125: 127-134. doi:10.1111/j.1399-3054.2005.00544.x

Saiki M, Fujita H, Soga K, Wakabayashi K, Kamisaka S, Yamashita M and Hoson T (2005) Cellular basis for the automorphic curvature of rice coleoptiles on a three-dimensional clinostat: Possible involvement of reorientation of cortical microtubules. J. Plant Res. 118: 199-205. doi:10.1007/s10265-005-0210-x

Hoson T, Saito Y, Soga K and Wakabayashi K (2005) Signal perception, transduction, and response in gravity resistance. Another graviresponse in plants. Adv. Space Res. 36: 1196-1202. doi:10.1016/j.asr.2005.04.095

Wakabayashi K, Soga K, Kamisaka S and Hoson T (2005) Changes in levels of cell wall constituents in wheat seedlings grown under continuous hypergravity conditions. Adv. Space Res. 36: 1292-1297. doi:10.1016/j.asr.2005.02.066

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2005) Hypergravity inhibits elongation growth of azuki bean epicotyls independently of the direction of stimuli. Adv. Space Res. 36: 1292-1297. doi:10.1016/j.asr.2005.05.029

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2005) Mechanoreceptors rather than sedimentable amyloplasts perceive the gravity signal in hypergravity-induced inhibition of root growth in azuki bean. Funct. Plant Biol. 32: 175-179. doi:10.1071/FP04145

2004


Hoson T, Soga K, Mori R, Saiki M, Nakamura Y, Wakabayashi K and Kamisaka S (2004) Cell wall changes involved in the automorphic curvature of rice coleoptiles under microgravity conditions in space. J. Plant Res. 117: 449-455. doi:10.1007/s10265-004-0182-2

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2004) Graviperception in growth inhibition of plant shoots under hypergravity conditions producedby centrifugation is independent of that in gravitropism and may involve mechanoreceptors. Planta 218: 1054-1061. doi:10.1007/s00425-003-1187-0

Uno-Okamura K, Soga K, Wakabayashi K, Kamisaka S and Hoson T (2004) Purification and properties of apoplastic amylase from oat (Avena sativa L.) seedlings. Physiol. Plant. 121: 117-123. doi:10.1111/j.0031-9317.2004.00298.x

Kaku T, Tabuchi A, Wakabayashi K and HosonT (2004) Xyloglucan oligosaccharides cause cellwall loosening by enhancing xyloglucan endotransglucosylase/hydrolase activityin azuki bean epicotyls. Plant Cell Physiol. 45: 77-82. doi: 10.1093/pcp/pch007

2003


Hoson T and Soga K (2003) New aspects of gravity responses in plant cells. Int. Rev. Cytol. 229: 209-244. doi:10.1016/S0074-7696(03)29005-7

Soga K, Wakabayashi K, Kamisaka S and HosonT (2003) Growth restoration in azuki bean and maize seedlings by removalof hypergravity stimuli. Adv. Space Res. 31: 2269-2274. doi:10.1016/S0273-1177(03)00254-0

Yoshioka R, Soga K, Wakabayashi K, Takeba G and Hoson T (2003) Hypergravity-induced changes in gene expression in Arabidopsis hypocotyls. Adv. Space Res. 31: 2187-2193. doi:10.1016/S0273-1177(03)00243-6

Hoson T, Soga K, Wakabayashi K, Kamisaka S and Tanimoto E (2003) Growth and cell wall changes in rice roots during spaceflight. Plant Soil 255: 19-26. doi:10.1023/A:1026105431505

Hoson T (2003) Development of the anti-gravitational system in land plants and its implication for the interaction between plants and other organisms. Biol. Sci. Space 17: 54-56. doi:10.2187/bss.17.54

Wakabayashi K, Hoson T and Huber DJ (2003) Methyl de-esterification as a major factor regulating the extent of pectin depolymerization during fruit ripening: a comparison of the action of avocado (Persea americana) and tomato (Lycopersicon esculentum) polygalacturonases. J. Plant Physiol.160: 667-673. doi:10.1078/0176-1617-00951

Nakamura Y, Wakabayashi K and Hoson T (2003) Temperature modulates the cell wall mechanical properties of rice coleoptiles by altering the molecular mass of hemicellulosic polysaccharides. Physiol. Plant 118: 597-604. doi:10.1034/j.1399-3054.2003.00144.x

Tokumoto H, Wakabayashi K, Kamisaka S, and Hoson T (2003) Xyloglucan breakdown during cotton fiber development. J. Plant Physiol.160: 1411-1414. doi:10.1078/0176-1617-01066

2002


Soga K, Wakabayashi K, Kamisaka S and Hoson T (2002) Stimulation of elongation growth and xyloglucan breakdown in Arabidopsis hypocotyls under microgravity conditions in space. Planta 215: 1040-1046. doi:10.1007/s00425-002-0838-x

Hoson T, Soga K, Mori R, Saiki M, Nakamura Y, Wakabayashi K and Kamisaka S (2002) Stimulation of elongation growth and cellwall loosening in rice coleoptiles under microgravity conditions in space. Plant Cell Physiol. 43: 1067-1071. doi:10.1093/pcp/pcf126

Hoson T (2002) Physiological functions of plant cell coverings. J. Plant Res. 115: 277-282. doi:10.1007/s10265-002-0035-9

Nakamura Y, Wakabayashi K, Kamisaka S and Hoson T (2002) Effects of temperature on the cell wall and osmotic properties in dark-grown rice and azuki bean seedlings. J. Plant Res. 115: 455-461. doi:10.1007/s10265-002-0058-2

Hossain MT, Mori R, Soga K, Wakabayashi K, Kamisaka S, Fujii S, Yamamoto R and Hoson T (2002) Growth promotion and increasein cell wall extensibility by silicon in rice and some other Poaceae seedlings. J. Plant Res. 115: 23-27. doi:10.1007/s102650200004

Tokumoto H, Wakabayashi K, Kamisaka S and Hoson T (2002) Changes in the sugar composition and molecular mass distribution of matrix polysaccharides during cell elongation of cotton fibers. Plant Cell Physiol. 43: 411-418. doi:10.1093/pcp/pcf048

Kaku T, Tabuchi A, Wakabayashi K, Kamisaka S and Hoson T (2002) Action of xyloglucan hydrolase within the native cell wall architecture and its effect on cell wall extensibility in azuki bean epicotyls. Plant Cell Physiol. 43: 21-26. doi:10.1093/pcp/pch007

2001


Soga K, Wakabayashi K, Hoson T and Kamisaka S (2001) Gravitational force regulates elongation growth of Arabidopsis hypocotyls by modifying xyloglucan metabolism. Adv. Space Res. 27: 1011-1016. doi:10.1016/S0273-1177(01)00176-4

Hoson T, Saiki M, Kamisaka S and Yamashita M (2001) Automorphogenesis and gravitropism of plant seedlings grown under microgravity conditions. Adv. Space Res. 27: 933-940. doi:10.1016/S0273-1177(01)00157-0

Wakabayashi K, Soga K, Hoson T, Kamisaka S,Yoshimura H and Shibata K (2001) Growth inhibition of lettuce ( Lactuca sativa L.) roots by α-amino acids, 2-amino-3-cyclopropyl-butanoic acidand 2-amino-5-chloro-4-pentenoic acid, isolated from Amanita castanopsidis Hongo. Plant Growth Regul. 33: 169-173. doi:10.1023/A:1017527421294

Wakabayashi K. and Huber DJ. (2001) Purification and catalytic properties of polygalacturonase isoforms from ripe avocado (Persea americana) fruit mesocarp. Physiol. Plant. 113: 210-216. doi:10.1034/j.1399-3054.2001.1130208.x

Tabuchi A, Mori H, Kamisaka S and Hoson T (2001) A new type of endo-xyloglucan transferase devoted to xyloglucan hydrolysis in the cell wall of azuki bean epicotyls. Plant Cell Physiol. 42: 154-161. doi:10.1093/pcp/pce016

2000


Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Flower stalk segments of Arabidopsis thaliana ecotype Columbia lack the capacity to grow in response to exogenously applied auxin. Plant Cell Physiol. 41: 1327-1333. doi:10.1093/pcp/pcd066

Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Hypergravity-induced increase in the apoplastic pH and its possible involvement in suppression of β-glucan breakdown in maize seedlings. Aust. J. Plant Physiol. 27: 967-972. doi:10.1071/PP00035

Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Changes in the apoplastic pH are involved in regulation of xyloglucan breakdown of azuki bean epicotyls under hypergravity conditions. Plant Cell Physiol. 41: 509-514. doi:10.1093/pcp/41.4.509

Wakabayashi K (2000) Changes in cell wall polysaccharides during fruit ripening. J. Plant Res. 113: 231-237. doi:10.1007/PL00013932

Wakabayashi K, Chun J-P and Huber DJ (2000) Extensive solubilization and depolymerization of cell wall polysaccharides during avocado (Persea americana) ripening involves concerted action of polygalacturonase and pectinmethylesterase. Physiol. Plant. 108: 345-352. doi:10.1034/j.1399-3054.2000.t01-1-100402.x

Hoson T, Kamisaka S, Wakabayashi K, Soga K,Tabuchi A, Tokumoto H, Okamura K, Nakamura Y, Mori R, Tanimoto E, Takeba G, Nishitani K, Izumi R, Ishioka N, Kamigaichi S, Aizawa S, Yoshizaki I, Shimazu T and Fukui K (2000) Growth regulation mechamisms in higher plants under microgravity conditions - Changes in cell wall metabolism. Biol. Sci.Space 14: 75-96. doi:10.2187/bss.14.75

Rahman A, Tsurumi S, Amakawa T, Soga K, Hoson T, Goto N and Kamisaka S (2000) Involvement of ethylene and gibberellin signalings in chromosaponin I-induced cell division and cell elongation in the roots of Arabidopsis seedlings. Plant Cell Physiol. 41: 1-9. doi:10.1093/pcp/41.1.1

Tsurumi S, Ishizawa K, Soga K, Hoson T, Goto N and Kamisaka S (2000) Effects of chromosaponin I and brassinolide on the growth of roots in etiolated Arabidopsis seedlings. J. Plant Physiol. 156: 60-67. doi:10.1016/S0176-1617(00)80273-4

Shimazu T, Miyamoto K, Hoson T, Kamisaka S and Ueda J (2000) Suitable experimental design for determination of auxin polar transport in space using a spacecraft. Biol. Sci. Space 14: 9-13. doi:10.2187/bss.14.9

Kawamura Y, Wakabayashi K, Hoson T, Yamamoto R and Kamisaka S (2000) Stress-relaxation analysis of submerged and air-grown rice coleoptiles. Correlations with cell wall biosynthesis and growth. J. Plant Physiol. 156: 689-694. doi:10.1016/S0176-1617(00)80233-3

Miyamoto K, Ito E, Yamamoto H, Ueda J and Kamisaka S (2000) Gibberellin-enhanced growth and sugar accumulation in growing subhooks of etiolated Pisum sativum seedlings: Effects of actinomycin D on invertaseactivity, soluble sugars and stem elongation. J. Plant Physiol. 156: 449-453. doi:10.1016/S0176-1617(00)80157-1

Hoson T (2000) Peroxidases. In Glycoenzymes, Edited by Ohnishi M, p. 137-147, Japan Scientific Societies Press, Tokyo.

1999


Soga K, Wakabayashi K, Hoson T and Kamisaka S (1999) Hypergravity increases the molecular mass of xyloglucans by decreasing xyloglucan-degrading activity in azuki bean epicotyls. Plant Cell Physiol. 40: 581-585. doi:10.1093/oxfordjournals.pcp.a029580

Soga K, Harada K, Wakabayashi K, Hoson T and Kamisaka S (1999) Increased molecular mass of hemicellulosic polysaccharides is involved in growth inhibition of maize coleoptiles and mesocotyls under hypergravity conditions. J. Plant Res. 112: 273-278. doi:10.1007/PL00013881

Soga K, Wakabayashi K, Hoson T and Kamisaka S (1999) Inhibition of reproductive growth of Arabidopsis in airtight vessels. Adv. Space Res. 23: 2037-2040. doi:10.1016/S0273-1177(99)00346-4

Wakabayashi K, Hoson T and Sakurai N (1999) Auxin stimulates the synthesis but not the loosening of cell walls in isolated outer tissue of dark-grown squash (Cucurbita maxima Duch.) hypocotyls. J. Plant Physiol. 154: 197-202. doi:10.1016/S0176-1617(99)80210-7

Hoson T (1999) JPR Symposium: Growth and morphogenesis of plant seedlings in space: STS-95 Space Shuttle experiments. J. Plant Res. 112: 475. doi:10.1007/PL00013896

Hoson T, Soga K, Mori R, Saiki M, Wakabayashi K, Kamisaka S, Kamigaichi S, Aizawa S, Yoshizaki I, Mukai C, Shimazu T, Fukui K and Yamashita M (1999) Morphogenesis of rice and Arabidopsis seedlings in space. J. Plant Res. 112: 477-486. doi:10.1007/PL00013903

Hoson T (1999) Interaction of gravity with other environmental factors in growth and development: an introduction. Adv. Space Res. 23: 1971-1974. doi:10.1016/S0273-1177(99)00339-7

Miyamoto K, Yamamoto R, Fujii S, Soga K, Hoson T, Shimazu T, Masuda Y, Kamisaka S and Ueda J (1999) Growth and development in Arabidopsis thaliana through an entire life cycle under simulated microgravity conditions on a clinostat. J. Plant Res. 112: 413-418. doi:10.1007/PL00013865

Miyamoto K, Oka M, Ueda J, Yamamoto R, Masuda Y, Hoson T and Kamisaka S (1999) Auxin polar transport in Arabidopsis under simulated microgravity conditions - Relevance to growth and development. Adv. Space Res. 23: 2033-2036. doi:10.1016/S0273-1177(99)00344-0

Chen L, Kamisaka S and Hoson T (1999) Suppression of (1→3),(1→4)-β-D-glucan turnover during light-induced inhibition of rice coleoptile growth. J. Plant Res. 112: 7-13. doi:10.1007/PL00013861

Chen L, Kamisaka S and Hoson T (1999) Breakdown of (1→3),(1→4)-β-D-glucans during development of rice coleoptiles in air andunder water. J. Plant Physiol. 155: 234-239. doi:10.1016/S0176-1617(99)80012-1

Yoshimura H, Takegami K, Doe M, Yamashita T, Shibata K, Wakabayashi K, Soga K and Kamisaka S (1999) α-Amino acids from a mushroom, Amanita castanopsidis Hongo with growth-inhibiting activity. Phytochemistry 52: 25-27. doi:10.1016/S0031-9422(99)00162-4

Morita A, Soga K, Hoson T, Kamisaka S and Numata H (1999) Changes in mechanical properties of the cuticle and lipid accumulation in relation to adult diapause in the bean bug, Riptortus clavatus. J. Insect Physiol. 45: 241-247. doi:10.1016/S0022-1910(98)00119-X

1998


Soga K, Harada K, Wakabayashi K, Hoson T and Kamisaka S (1998) Inhibition of growth of azuki bean and maize seedlings by hypergravity. J. Jpn Soc. Microgravity Appl. 15: 640-642.

Hoson T, Kamisaka S, Yamashita M and Masuda Y (1998) Automorphosis of higher plants on a 3-D clinostat. Adv. Space Res. 21: 1229-1238. doi:10.1016/S0273-1177(97)00640-6

Hoson T (1998) Apoplast as a site of response to environmental signals. J. Plant Res. 111: 167-177. doi:10.1007/BF02507163

Masuda Y, Kamisaka S and Hoson T (1998) Growth behaviour of rice coleoptiles. J. Plant Physiol.. 152: 180-188. doi:10.1016/S0176-1617(98)80130-2

Parvez MM, Wakabayashi K, Hoson T and Kamisaka S (1998) White light-induced sugar distribution controls growth and osmotic properties in the coleoptile and the first leaf in Zea mays seedlings. Physiol. Plant. 102: 1-8. doi:10.1034/j.1399-3054.1998.1020101.x