Rice Systemic Resistance Induced by Xanthomonas oryzae pv. oryzae Strain With Weak Virulence——And Changes of Defense Enzyme Activities

Abstract

Abstract: 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.

Key words: Xangthomonas oryzae pv. oryzae, systemic resistance, defense enzyme, active oxygen, rice

CAO Ci-Sheng, WANG Hai-Hua. Rice Systemic Resistance Induced by Xanthomonas oryzae pv. oryzae Strain With Weak Virulence——And Changes of Defense Enzyme Activities[J]. journal6, 2000, 21(2): 58-62.

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