不同旱稻品种灌浆期抗旱生理适应性的研究

选择抗旱性不同的4个旱稻品种,对其灌浆期旗叶抗旱性生理指标进行测定。结果表明:超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性及游离脯氨酸含量均为抗旱性较强品种(旱稻15号,旱稻2号)极显著地高于抗旱性较弱品种(旱稻1号,旱稻3号);丙二醛(MDA)含量和细胞膜相对透性大小表现为抗旱性较强品种(旱稻15号,旱稻2号)极显著地低于抗旱性较弱品种(旱稻1号,旱稻3号)。SOD、POD、CAT活性和丙二醛含量、游离脯氨酸含量、细胞膜相对透性可用来说明旱稻品种之间的抗旱生理适应性的差异。

Study on physiological adaptation of drought stress on up-rice at filling stage

The flag leaves stress physiological index of four breeds of upland rice were studied on filling stage.The result showed that the activity of superoxide dismutase(SOD),peroxidase(POD),Catalase(CAT) and the content of Proline in drought stronger varieties(Handao15 and Handao 2)were observably higher than drought resistance of the weaker varieties(Handao 3 and Handao 1),and the content of Malondialdehyde(MDA) and the electrical conductivity in drought stronger varieties(Handao 15 and Handao 2) were significantly lower than drought resistance of the weaker varieties(Handao 1 and Handao 3).So the activity of SOD,POD,CAT and the content of MDA,Proline,the electrical conductance reveal the difference of physiological adaptation in different varieties.