盐胁迫下ABA对刺槐幼苗体内腐胺,脯氨酸和保护酶系统的影响

盐胁迫下刺槐幼苗的生长明显受抑,相对含水量(RWC)降低,质膜透性变大,超氧物歧化酶(SOD)和过氧化氢酶(CAT)活性变小,同时大量积累游离脯氨酸和腐胺含量。外源ABA能缓和盐胁迫对生长的抑制,减少质膜透性,提高RWC,SOD和CAT活性,脯氨酸量被继续增加,但腐胺量却被减少,表明腐胺量的变化与幼苗的水分状况和遭受胁迫的程度一致,腐胺积累的多少可作为植物遭受胁迫程度的生理指标。

Effects of ABA on Putrescine, Proline and Protec-tive Enzyme System in Black Locust Seedling Under Salt Stress.

Salt stress enables the growth of black locust seedling to inhibite distinctly and makes plasma membrane permeability larger and the activities of superoxide dismutase (SOD) and catalase (CAT) smaller. It makes relative water content (RWC) lower, too. At the Fame time, free proline and putrescine accumulate greatly. Exogenous ABA can relax the growth retardation of black locust seedlings under salt stress, and reduce the relative permeability of plasma membrane and improve RWC and the activities of SOD and CAT. Proline content increases stably and putrescine content reduces. The change of putrescine content is in keeping with the water status of seedling and the level which is subjected to stress. Accumulated amount of putrescine can regard as a physiological indicator of plants under salt stress.