【摘要】 为缓解高盐对玉米幼苗生长的抑制作用,提高其抗盐性。本研究采用150 mmol/L的Na Cl溶液进行浸根方式模拟玉米幼苗在高盐下生长状况,通过施用不同浓度的外源SA和ABA激素,探究盐胁迫下对玉米幼苗生长和抗氧化物酶活性的变化以及外源激素调控的效果,为高盐地区提高玉米苗期耐盐性提供理论依据。实验表明:在高盐胁迫下施用一定浓度水杨酸(SA)和脱落酸(ABA)处理能显著增加玉米幼苗株高、根长、鲜重、干重,提高了植物体内过氧化氢酶(CAT)、超氧化为歧化酶(SOD)活性、过氧化物酶(POD)活性,减少了丙二醛(MDA)的含量,保护了膜系统的完整性,增强了幼苗在高盐条件的耐盐性。综合分析认为施用25 mg/L的水杨酸(SA)和2.5 mg/L的脱落酸(ABA)更有助于玉米幼苗在高盐胁迫的适应性。更多还原

【Abstract】 In order to alleviate the inhibitory effect of high salt on the growth of maize seedlings, and to improve its salt tolerance. In this study, 150 mmol/L Na Cl solution was used to stimulate the growth of maize seedlings under high salt stress. The effects of exogenous SA and ABA hormones on the growth of maize seedlings under salt stress and the activities of antioxidant enzymes and the effects of exogenous hormones on the growth and development of high-salt corn. The results showed that plant height, root length, fresh weight, and dry weight of maize seedlings increased significantly under high salt stress by SA and ABA treatments, and increased the contents of hydrogen peroxide(CAT), superoxide dismutase(SOD) activity, peroxidase(POD) activity, reduced malon dialdehyde(MDA) content, protected the integrity of the membrane system, enhanced the seedlings in high salt conditions of the salt tolerance. It was concluded that the application of salicylic acid(SA) of 25 mg/L to 50 mg/L and abscisic acid(ABA) of 0.5 mg/L to 2.5 mg/L could improve the adaptability of maize seedlings to high salt stress.更多还原