干旱预处理的玉米幼苗对逆境的交叉适应研究

为了研究玉米干旱胁迫后对其他逆境的适应性,以沈单16和T2208幼苗为试验材料,测定了玉米幼苗干旱预处理后分别在干旱、低温、高温和盐渍的环境中处理一段时间后的存活率、幼苗细胞膜相对透性、MDA含量及POD、CAT、SOD活性。结果表明,短期的干旱预处理会提高玉米幼苗对干旱胁迫、冷胁迫、热胁迫及盐胁迫的抗性,增强了作物的抗逆性,幼苗的存活率提高,细胞膜的相对透性降低,MDA含量减少,三种保护酶CAT、SOD、POD活性提高,表明玉米幼苗具有交叉适应能力。

Cross adaptation of stress on maize seedlings under drought induced

Maize(Shendan16 and T2208) seedlings were used to study on survival rate,electrolyte leakage(EL) of seedlings,content of MDA,activities of CAT,SOD and POD of maize seedlings in drought,chilling,heat and salt stress was induced.The results of cross adaptation showed that,the resistance to drought,chilling,heat and salt stress of maize seedlings was improved through short-term drought pretreatment,the resistance to stress and survival rate of maize were also improved,while EL and the content of MDA were reduced,and the activities of CAT,SOD and POD were improved.The phenomenon of cross adaptation on maize seedlings was demonstrated.These evidences showed that maize seedlings have the ability of cross-adaptation under drought induced.