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.

这项研究旨在研究作物根系对水胁迫的反应。特别注意由根系组成的组件根表现出的塑料反应。特别是，评估了水稻根系对各种水状态的第一发育和功能可塑性。水状态包括土壤水分波动，例如水应力，然后重新水域在干旱后模拟下雨，并在供水，干旱，然后重新水域模拟雨天的低地条件。接下来，我们检查了水应力对玉米，cow豆和大米的衰老和根系的影响。最后，我们试图定量评估在水应力条件下甜果酱根块茎的供水能力。结果表明，根系的发展和形态受到土壤水状况的极大影响，土壤水的较大的可塑性可确保植物在水应力下的生长，并且由根系所表现出的可变性在根系中表现出了构成对压力的综合响应的结果。此外，我们发现Sweetpotato的根块块在供应水中发挥着重要作用，尤其是当土壤干燥时。这些发现为根系在农作物干旱耐受性中的作用提供了基础，并有望为干旱容易发生区域的干旱耐受性和生产技术的繁殖计划做出贡献。

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。

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。

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.: "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）。