Analysis of depth effects on maintenance of water-uptake ability of rice root system in relation to drought resistance under rewatering conditions

复水条件下水稻根系吸水能力维持与抗旱性的深度效应分析

• 批准号: 08456010
• 负责人: INAMURA Tatsuya
• 金额: $ 3.9万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08456010/
• 关键词: rice cultivar; drought resistance; root; hydraulic conductance; イネ; 耐旱性; 吸水速度; 蒸散; 耐干性; 通導コンダクタンス; 水ポテンシャル

In this study, the depth effects on water-uptake ability of rice root system were investigated in relation to root system development and hydraulic conductance under rewatering condition.1. The rapid root system development in the deeper part of soil is one of the most important traits of cultivars in order to have higher recovery from water stress during rewatering period.2. The drought resistance is related to water-uptake ability, and high contents of lignin and cellulose in the root cell wall that support the water-uptake ability by increasing the rigidity of roots under stressed conditions.3. Root systems in the deeper part of soil experience higher water potential than in the surface layer under water stressed condition. Given adequate substrate by higher recovery from water stress under following rewatering condition, their root system development and hydraulic conductance of drought resistance varieties are less restricted than sensitive varieties.

在复水条件下，研究了深度对水稻根系吸水能力的影响，影响因素与根系发育和水分传导性有关。根系在土壤深层的快速发育是品种在复水期从水分胁迫中恢复较快的重要特征之一。抗旱性与其吸水能力有关，根系细胞壁中木质素和纤维素含量高，在逆境条件下，木质素和纤维素通过增加根系的刚性来支持吸水能力。在水分胁迫条件下，土壤深层根系的水势高于表层根系。在后续复水条件下，如果基质充足，抗旱性较强，根系发育和水力导度受到的限制要小于敏感品种。

项目成果

M.Ohnishi: "Modeling and evaluation of producctivity of rainfed rice in northeast Thailand." Proc.Int.Symp. "World Food Security", Kyoto. 173-176 (1999)

M.Ohnishi：“泰国东北部雨养稻生产力的建模和评估。”

M.Ohnishi: "Modeling and evaluation of productivity of rainfed rice in northeast Thailand." Proc.Int.Symp."World Food Security". 173-176 (1999)

M.Ohnishi：“泰国东北部雨养稻生产力的建模和评估”。

Utako Hiramatsu: "Relationship between Cell Wall Components and Water-Uptake Ability in Rice Roots under Water-Stressed Conditions" Proc.Int.Symp.“World Food Security and Crop Production Technologies for Tomorrow". 310-311 (1999)

Utako Hiramatsu：“水分胁迫条件下水稻根部细胞壁成分与吸水能力的关系”Proc.Int.Symp.“未来世界粮食安全和作物生产技术”310-311（1999）。

稲村達也: "イネの栄養生長期間における水ストレスからの回復性." 近畿作物・育種研究. 42. 54-55 (1997)

Tatsuya Inamura：“水稻营养生长期水分胁迫的恢复”，《近畿作物育种研究》，42. 54-55 (1997)。

T.Inamura: "Drought Stress Recovery in Vegetative Stage of Rice." Kinki J.Crop.Sci.Breed. 42. 54-55 (1997)

T.Inamura：“水稻营养阶段的干旱胁迫恢复”。