摘要
以两个不同耐盐力水稻品种80—85(耐盐)和83—51(不耐盐)为材料进行研究。根系Na^+总吸收随盐胁迫的加重而增高,耐盐品种始终具有较低的Na^+总吸收和较高的整株K^+/Na^+比;在10mmol/1 NaCl浓度下显示出根系具有较低的Na^+吸收速率和较强的对K^+选择性(S_K:Na)。低盐浓度(0.2％NaCl)对根质膜ATP酶活性略有提高;在高盐浓度(0.5％NaCl以上)下,质膜ATP酶活性受到明显抑制,不耐盐品种受抑程度更大。ATP酶活性的下降与根部Na^+积累以及K^+吸收的减少相伴随,推测根系K^+、Na^+吸收与质膜ATP酶有关。
The absorption of Na^+ and function of plasma membrane ATPase from rice roots ex- posed to salt stress were investigated using two varieties, 80--85 (salt-tolerant) and 83--51 (susceptible). The rice seedlings were grown in Espino culture solution containing different NaCl concentrations. Na^+ content in the whole plants (including root and shoot) increased with increasing ex- ternal NaCl concentration and prolonging the treatment. There was a apparent varietal difference in Na^+ absortion of the root. For the salt-tolerant variety, with low total Na^+ uptake by the root and high K^+ / Na^+ ratio in tha whole plant, the Na^+ uptake rate was lower and selectivity for K^+ uptake over Na^+ uptake (S_(K:Na)) was higher at 10 mmol/1 ion concentration than that of the salt susceptible variety. It was observed that low NaCl (0. 2% or 34 mmol/1) caused a slight increase in the plasma membrane ATPase activity from rice roots. However, the ATPase activity was inhibited obviously by high Na^+ (above 0. 5% or 86 mmol/1), especially for the susceptible. The define of the enzyme activity was accompanied by accumulation of Na^+ and decrease of K^+ uptake in the roots. The results suggest that K^+ and Na^+ uptake might be controlled by the plasma membrane ATPase.
出处
《中国水稻科学》
CAS
CSCD
北大核心
1992年第1期27-32,共6页
Chinese Journal of Rice Science
基金
国家自然科学基金
关键词
钠吸收
质膜ATP酶
耐盐性
水稻
Ion selectivity
Na^+ uptake
Plasma membrane ATPase
Salt tolerance
