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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。
In order to alleviate the inhibitory effect of high salt on the growth of maize seedlings and improve their salt resistance. In this study, 150 mmol / L NaCl solution was used to simulate the growth of maize seedlings under high salt stress. By applying different concentrations of exogenous SA and ABA hormones, the effects of salt stress on the growth of maize seedlings and the activities of antioxidant enzymes Activity changes and the effect of exogenous hormone regulation, provide the theoretical basis for improving the salt tolerance of maize seedlings in high salt areas. The results showed that SA and ABA could significantly increase the plant height, root length, fresh weight and dry weight of corn seedlings under high salt stress and increase the activity of catalase CAT), superoxide dismutase (SOD) activity and peroxidase (POD) activity, decreased the content of malondialdehyde (MDA), protected the integrity of the membrane system and enhanced seedling tolerance in high salt conditions Salt. The comprehensive analysis indicated that the application of 25 mg / L salicylic acid (SA) and 2.5 mg / L abscisic acid (ABA) was more helpful to the adaptability of corn seedlings under high salt stress.