Morpho-physiological studies on Na^+ exclusion system of a root under saline stress

盐胁迫下根系Na^排阻系统的形态生理研究

• 批准号: 05454048
• 负责人: TSUCHIYA Mikio
• 金额: $ 2.37万
• 依托单位: Okayama Univ.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05454048/
• 关键词: Cellulose; Graminese; Ion exclusion; Lignin; Reverse osmosis; Root; Salt tolerance; Stress relaxation; イオン透過性; イネ; ソルガム; 代謝阻害剤; トウモロコシ

In order to improve crop productivity under saline condition, it is importnat to identify the plant characters relating to salt tolerance and to strengthen them by breeding or improved cultivation. For example, though rice salt tolerant varieties absorb and accumulate less sodium in a shoot, the characters relating to less absorption of sodium is not clear.In this research, a mechanism of Na^+ exclusion, structural characteristics and a easy method for evaluating root capacity of ion exclusion were studied.The effect of supplied pressure, temperature, pH,dissolved air content, ion species and metabolic inhibitors on ion exclusion rate of a rice root exposed to salt solution suggested that the ion exclusion in a root was based on the principle of revers osmosis ; with cell layrs of exodermis and endodermis worked as semipermeable membrane, and with negative pressure as a driving force produced by transpriration.The difference in Na^+ exclusion rate was found among some species of Gramineae and varieties of rice and barley. From anatomical and chemical analysis, it was indicated that the characteristics of high cellulose content in root and high lignin content inroot and shoot was closely related to high rate of Na^+ exclusion. Moreover, it was suggested that the measurement of stress relaxation curve of a root in salt solution was helpful to easily evaluate root capacityn of ion exclusion.

为了在盐水状况下提高农作物的生产率，要确定与耐盐性耐受性有关的植物特征并通过繁殖或改善培养来增强它们是很重要的。例如，尽管在拍摄中吸收水稻耐受性品种并积累了较少的钠，但与钠的吸收较少有关的字符尚不清楚。在这项研究中，Na^+排除的机制，结构性特征，简单的方法和一种评估离子排除的根源的方法。暴露于盐溶液中表明，根中的离子排除是基于反向渗透原理。外胚层和内胚层的细胞外层是半透明的膜，并且负压是通过超推动产生的驱动力。Na^+排除速率的差异在某些gramineae和大米和大麦的种类中发现。从解剖学和化学分析中，可以表明根和高木质素含量在根和芽中的高纤维素含量的特征与Na^+排除的高速率密切相关。此外，有人提出，盐溶液中根部应力松弛曲线的测量有助于轻松评估离子排除的根容量。

项目成果

Tsuchiya,M.: "Physiological Response to Salinity in Rice Plant, V. Varietal difference in ion exclusion of root exposed to NaCl stress under defferent hydraulic pressures" Japanese Journal of Crop Science. 64. 102-108 (1995)

Tsuchiya,M.：“水稻植物对盐度的生理反应，V.不同水压下暴露于氯化钠胁迫的根离子排除的品种差异”《日本作物科学杂志》。

Tsuchiya,M.: "Physiological Response to Salinity in Rice Plant,IV. Ion exclusion in the excised root exposed to NaCl stress with hydraulic presssure" Japanese Journal of Crop Science. 64. 93-101 (1995)

Tsuchiya,M.：“水稻植物对盐度的生理反应，IV。暴露于水压氯化钠胁迫下的切除根中的离子排除”《日本作物科学杂志》。

Tsuchiya, M.: "Physiological Response to Salinity in Rice Plant, V.Varietal difference in ion exclusion of root exposed to NaCl stress under defferent hydraulic pressures" Japanese Journal of Crop Science. 64. 101-108 (1995)

Tsuchiya, M.：“水稻植物对盐度的生理反应，V.不同水压下暴露于 NaCl 胁迫的根离子排除的品种差异”《日本作物科学杂志》。

Tsuchiya, M.: "Physiological Response to Salinity in Rice Plant, IV.Ion exclusion in the excised root exposed to NaCl stress with hydraulic pressure" Japanese Journal of Crop Science. 64. 93-101 (1995)

Tsuchiya, M.：“水稻植物对盐度的生理反应，IV.暴露于水压氯化钠胁迫下的切除根中的离子排除”《日本作物科学杂志》。