外源水杨酸对水稻幼苗盐胁迫下生理效应的影响

Effects of Exogenous Salicylic Acid on Physiology of Rice Seedlings under Salt Stress

研究了在盐胁迫条件下外源水杨酸(SA)对水稻幼苗耐受性应答的影响.本研究以水稻为材料,用1 mmol/L的外源水杨酸对水稻幼苗叶片进行喷雾处理,静置24 h后,经SA处理后的水稻幼苗再经过100 mmol/L的NaCl胁迫处理0-48 h.结果表明,经外源水杨酸处理的水稻幼苗,能显著增强体内脯氨酸(Pro)、可溶性蛋白的含量以及超氧化物歧化酶(SOD)、过氧化物酶(POD)等保护酶的活性,显著降低丙二醛(MDA)的含量.表明在盐胁迫条件下,外源水杨酸能增强水稻幼苗自身抗氧化系统中酶的活性,减轻和缓解盐胁迫带来的伤害.

The effect of extraneous salicylic acid （SA） on the tolerance responses to NaCl stress in rice seedlings was studied. Rice seedlings were sprayed by 1 mmol/L SA and were then stressed under 100 mmol/L NaCl for 0 -48h. The results indicated that exogenous salicylic acid significantly increased the contents of proline （Pro） and soluble protein and also increased the activities of protected enzymes such as superoxide dismutase （ SOD） and peroxidase （POD） in rice seedlings leaves, but decreased the content of malondialdehyde （MDA） in rice leaves. It is proposed that exogenous salicylic acid participated in the tolerance responses to NaCl stress in rice, which enhanced the tolerance of rice against NaCl stress by regulated the activity of antioxidant enzymes and decrease damage degree of salt stress.