【摘要】 研究了外源亚精胺对盐胁迫下耐盐水稻品种Pokkali和盐敏感水稻品种Peta根系抗氧化酶活性、脯氨酸、可溶性蛋白含量及根系活力的影响。结果表明:外源亚精胺可以提高盐胁迫下不同耐盐性水稻品种根系中超氧化物歧化酶(SOD),过氧化物酶(POD)和过氧化氢酶(CAT)活性,降低超氧阴离子(O2-.)产生速率和丙二醛(MDA)含量;使盐胁迫下根系脯氨酸的含量升高;并且可以阻止盐胁迫下两品种水稻根系可溶性蛋白含量及根系活力的降低。这表明,外源亚精胺可缓解盐胁迫对两品种水稻根系的伤害,并且对盐敏感品种Peta的缓解作用大于耐盐品种Pokkali。更多还原

【Abstract】 The effects of exogenous spermidine on anti-oxidative enzyme activities,contents of proline and soluble protein and root vigor in roots of rice cultivars(Pokkali,salt-tolerant and Peta,salt-sensitive) under salt stress were studied in this paper.The results showed that the activities of SOD,POD and CAT and contents of proline in roots of two rice cultivars with exogenous spermidine treatment under salt stress were increased,while the O2-· producing rate and contents of MDA were decreased.Moreover,the decline of contents of soluble protein and root vigor in roots of rice cultivars was alleviated by exogenous spermidine treatment.These results suggested that exogenous spermidine could alleviate the injury of NaCl stress in roots of rice cultivars.Moreover,the alleviation effect of exogenous Spd in roots of salt-tolerant was less than that of salt-sensitive Peta under salt stress.更多还原