Developmental responses of crop root system to water stress and its physiological basis

作物根系对水分胁迫的发育响应及其生理基础

• 批准号: 11660017
• 负责人: YAMAUCHI Akira
• 金额: $ 2.24万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660017/
• 关键词: cowpea; drought tolerance; plasticity; rice; root; water stress; senescence; 老化; 根系; 水吸収

This study aimed to investigate the responses of crop root system to water stress. Special attention was paid to plastic responses exhibited by component roots that consist of the root system.Specifically, first developmental and functional plasticity of rice root system to various water regimes was evaluated. The water regimes included soil moisture fluctuations such as water stress followed by rewatering simulating raining after drought, and waterlogging, drought and then rewatering simulating rainfed lowland conditions. Next, we examined the effects of water stress on senescence and turn over of root system for maize, cowpea and rice. Finally, we attempted to quantitatively evaluate the water supply ability of root tuber of sweetpotato under water stress conditions.Results revealed that root system development and morphology are greatly affected by soil water conditions, such large plasticity of root system ensures the growth of plant under water stress, and the plasticity exhibited by the root system is the integrated results of differentiated responses of component roots to the stress. Further, we found that root tuber of sweetpotato may play a substantial role in supplying water to shoot especially when soil dries. These findings provides with bases on the role of root system in crop drought tolerance, and are expected to contribute to the progress of breeding program for drought tolerance and production technology in drought prone areas.

本研究旨在探讨作物根系对水分胁迫的响应。特别关注组成根系的根系所表现出的可塑性反应。具体来说，首先评估了水稻根系对各种水况的发育和功能可塑性。水状况包括土壤湿度波动，例如水分胁迫，然后模拟干旱后下雨的补水，以及模拟雨养低地条件的涝渍、干旱然后补水。接下来，我们研究了水分胁迫对玉米、豇豆和水稻根系衰老和更新的影响。最后，我们尝试定量评价水分胁迫条件下甘薯块根的供水能力。结果表明，根系发育和形态受土壤水分条件影响较大，根系如此大的可塑性保证了植物在水分胁迫下的生长，根系表现出的可塑性是组成根对胁迫差异反应的综合结果。此外，我们发现甘薯的块根可能在为芽供水方面发挥重要作用，尤其是在土壤干燥时。这些研究结果为根系在作物耐旱性中的作用提供了依据，有望为干旱地区耐旱育种和生产技术的进步做出贡献。

项目成果

Pardales Jr.J.R. et al.: "The Effect of Soil Moisture Fluctuation on Root Development During the Establishment Phase of Sweetpotato"Plant Production Science. 3・2. 134-139 (2000)

Pardales Jr.J.R. 等：“甘薯根系发育的影响”植物生产科学 134-139。

Pardales Jr.J.R., Banoc, D.M., Yamauchi, A., Iijima M., and Esquibel, C.B.: "The Effect of Soil Moisture Fluctuation on Root Development During the Establishment Phase of Sweetpotato."Plant Production Science. 3(2). 134-139 (2000)

Pardales Jr.J.R.、Banoc, D.M.、Yamauchi, A.、Iijima M. 和 Esquibel, C.B.：“土壤湿度波动对甘薯根系发育的影响”。植物生产科学。

Banoc, D.M., Yamauchi, A., Kamoshita, A., Wade, L.J.and Pardales, Jr.J.R: "Genotypic variations in response of lateral root development to fluctuating soil moisture in rice."Plant Production Science. 3(3). 335-343 (2000)

Banoc, D.M.、Yamauchi, A.、Kamoshita, A.、Wade, L.J. 和 Pardales, Jr.J.R：“水稻侧根发育对土壤湿度波动的响应的基因型变化。”植物生产科学。

Banoc, D.M., Yamauchi, A., Kamoshita, A., Wade, L.J.and Pardales, Jr.J.R.: "Dry matter production and root system development of rice cultivars under fluctuating soil moisture."Plant Production Science. 3(2). 197-207 (2000)

Banoc, D.M.、Yamauchi, A.、Kamoshita, A.、Wade, L.J. 和 Pardales, Jr.J.R.：“土壤湿度波动下水稻品种的干物质生产和根系发育。”植物生产科学。

Banoc,D.M. et al.: "Genotypic variations in response of lateral root development to fluctuating soil moisture in rice"Plant Production Science. 3・3. 335-343 (2000)

Banoc，D.M. 等：“水稻侧根发育对土壤湿度波动的反应的基因型变化”《植物生产科学》3・3（2000 年）。