摘要
2个品种 (余水糯 ,浙辐 80 2 )的水稻幼苗经白叶枯菌 (Xanthomonasoryzaepv .oryzae)弱毒株 75 - 1处理后 ,均获得了对白叶枯菌强毒株 76 - 2 5的系统抗性 ,超氧化物歧化酶 (SOD)、过氧化氢酶 (CAT)活性下降 ,脂氧合酶 (LOX)、丙二醛含量升高 Tiron削弱了 75 - 1对上述指标的诱导作用 ,导致 75 - 1对余水糯和浙福 80 2的互作由非亲和性类型转变为类似亲和性性类型 提示O-.2
Seedlings of two rice cultivars,Yushuinuo and Zhefu 802,acquired systemic resistance to Xanthomonas oryzae pv. oryzae (XOO) strain 76-25 with high virulence when induced by XOO 75-1 strain with weak virulendce.Activities of superoxide dismutase(SOD),catalase(CAT) decreased in leaves pre-treated with XOO 75-1,However,lipoxygenase(LOX) activity and malondialdehyde(MDA) content increased after treatment.Tiron(4,5-dihydroxy1-1,3-bezene-disulfonic acid),which can specially react with O -. 2,weakened induction effect on the items mentioned above by XOO 75-1.It was also found that the incompatible interaction type between 75-1 strain and the two cultivars turned into something like compatible interacton.It suggested that membrane lipid peroxidation damage mediated by active oxygens like O -. 2 and changes of defense enzyme activities were related to systemic acquired resistance to XOO in rice seedlings.
