JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleHydrotropism and auxin-inducible gene expression in roots grown under microgravity conditions
Author(jpn)高橋 秀幸; 藤井 伸治; 宮沢 豊
Author(eng)Takahashi, Hideyuki; Fujii, Nobuharu; Miyazawa, Yutaka
Author Affiliation(jpn)東北大学 大学院生命科学研究科; 東北大学 大学院生命科学研究科; 東北大学 大学院生命科学研究科
Author Affiliation(eng)Tohoku University Graduate School of Life Sciences; Tohoku University Graduate School of Life Sciences; Tohoku University Graduate School of Life Sciences
Issue Date2005-03
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title宇宙利用シンポジウム 第21回 平成16年度
Space Utilization Research: Proceedings of the Twenty-first Space Utilization Symposium
Start page301
End page302
Publication date2005-03
AbstractRoots display not only gravitropism but also hydrotropism in determining their growth orientation. It has been reported that gravity alters or interferes with hydrotropism. It is proposed to use the microgravity environment in space to separate hydrotropism from gravitropism and to dissect respective mechanisms in Arabidopsis roots. It has been discovered that the roots sense moisture gradient and guide their growth orientations: this led to demonstrate the existence of hydrotropism. In addition, it has been found that both gravitropism and hydrotropism involve auxin redistribution. Furthermore, a variety of early/primary auxin-inducible genes have been identified, and both hydrotropism and gravitropism are accompanied with asymmetric expressions of such genes. The proposal comprises four specific aims. The first aim is to classify the responses of roots to moisture gradient and gravity, which can be observed when roots are grown with or without gravity, in combination with the presence or absence of moisture gradient. The second aim is to compare auxin redistribution that occurs due to moisture gradient and gravity by analyzing reporter gene expressions controlled by an auxin-inducible promoter. The third aim is to confirm auxin-inducible genes whose expressions are responsible for hydrotropism and gravitropism in roots. The fourth aim is to examine whether guidance of root growth orientation by hydrotropism could be used to cultivate plants under microgravity conditions in space. The investigation will verify the existence of the two regulatory systems for auxin redistribution and reveal the auxin-inducible genes that function in hydrotropism and gravitropism. The results will provide important information to understand the molecular mechanisms underlying the two tropisms. It will also aid the development of a method that will enable the effective and permanent cultivation of plants under microgravity conditions.
Keywordsarabidopsis; auxin; auxin-inducible gene; gravitropism; hydrotropism; microgravity; clinostat; plant growth; plant root; gene; シロイヌナズナ; オーキシン; オーキシン制御遺伝子; 重力屈性; 水分屈性; 微小重力; クリノスタット; 植物成長; 植物の根; 遺伝子
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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