防卫基因PAL,LOX和PBZ1在水稻白叶枯病成株抗性中的作用(英文)

Roles of Defense Genes PAL,LOX and PBZ1 in Adult Plant Resistance to Rice Bacterial Blight

为了探讨水稻白叶枯病成株抗性是否与防卫基因相关 ,通过RT PCR研究了几种防卫基因PAL、LOX、PBZ1、Cht 1和PR1a的表达 ,同时也分析了PAL和LOX的酶活性变化 .结果表明 ,苗期PAL受病原菌诱导上调表达 ,而成株期病原菌和伤害均可诱导PAL上调表达 ,且成株期诱导表达强于苗期 .LOX在苗期和成株期都可受病原菌诱导表达 ,但成株期表达强于苗期且更持久 .PBZ1在苗期和成株期均受病原菌和伤害诱导表达 ,但成株期表达较苗期早且更强 .PR1a和Cht1没检测到期望的扩增片段 .PAL和LOX的酶活性分析结果与基因表达分析结果一致 .因此 ,PAL、LOX和PBZ1在苗期和成株期的表达差异可能与水稻白叶枯病成株抗性相关 .

In order to investigate whether defense genes PAL,LOX,PBZ1,PR1a and Cht1 participate in APR(adult plant resistance)to rice bacterial blight, their expression were analyzed using RT-PCR. Enzymatic activities of PAL and LOX were also measured. Results indicated that PAL was induced by pathogen and wounding in adult plants while it only induced by pathogen at the seedlings,and the expression of PAL was stronger in adult plants than that in seedlings. Expression of LOX was induced by pathogen both in seedlings and adult plants and it was stronger in adult plants than that in seedlings. Expression PBZ1 was induced by both pathogen and wounding in both seedlings and adult plants and it is earlier and stronger in adult plants than that in seedlings. No expected fragments were obtained for PR1a and Cht1. Enzymatic activities of PAL and LOX were consistent with their mRNA accumulations,respectively. It is probable that activation of PAL,LOX, and PBZ1 play crucial roles in APR to rice bacterial blight.