【摘要】 玉米种子经水杨酸(SA)预处理后其幼苗的耐热性与耐冷性提高。其中以300μmol·L-1SA预处理的玉米幼苗对46℃高温胁迫2d的耐热性提高最大,150μmol·L-1SA预处理的玉米幼苗对1℃低温胁迫5d的耐冷性提高最大。在高温和低温胁迫过程中,SA预处理过的玉米幼苗中过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、过氧化物酶(GPX)、超氧化物歧化酶(SOD)和谷胱甘肽还原酶(GR)的活性水平均高于未经SA处理的。更多还原

【Abstract】 Salicylic acid (SA) treatment of maize seeds could markedly enhanced heat and chilling tolerance of maize seedlings. 300 μmol·L-1 of SA could increase the heat tolerance of maize seedlings under 46℃ for 2 d and 150 μmol·L-1 of SA could enhance the chilling tolerance under 1℃ for 5 d. The activities of antioxidant enzymes CAT,APX,GPX,SOD and GR in maize seedlings induced by SA during heat and chilling stress were all higher than the control.更多还原