[Objective] This study was carried out to determine the induction effect of jasmonic acid（JA）on powdery mildew resistance in wheat,the activation effect on the expressions of plant disease resistance related genes,and to investigate the relationship between the induced resistance and the gene expression patterns.[Method] Three powdery mildew susceptible cultivars of ＂Chinese Spring＂,＂Pumai 9＂ and ＂Zhoumai 18＂ typically representing different phenotypes in the field were employed.The powdery mildew was assessed by detached leaf assay,and real time quantitative RT-PCR was used to determine the expression patterns of 9 disease resistance related genes of PR1（PR1.1）,PR2（β,1-3 glucanase）,PR3（chitinase）,PR4（wheatwin1）,PR5（thaumatin-like protein）,PR9（TaPERO,peroxidase）,PR10,TaGLP2a（germin-like）and Ta-JA2（jasmonate-induced protein）in leaf of the three cultivars.[Result] MeJA application enhanced the powdery mildew resistances of ＂Chinese Spring＂,＂Pumai 9＂ and ＂Zhoumai 18＂.The induced powdery mildew resistance could be detected from 12 h to 96 h after MeJA treatment,and the peak value was at 24 h.Though there were differences between the three cultivars,MeJA significantly effect on the expressions of the 8 disease resistance related genes except TaGLP2a,and the peak values were at 12 h,24 h or 48 h after treatments.The strongest activation of MeJA was on PR9 and PR1 that their expressions could reach more than 100 times of the untreated samples.MeJA strongly activated PR2、PR4、PR5、PR3、PR10 and Ta-JA2,their expression could reach 10 to 70 times,and there was almost no activation effect on TaGLP2a.The induced powdery mildew resistance positively correlated with the induced expressions of the 8 disease related genes.[Conclusion] The induced powdery mildew resistance positively correlated with the induced expressions of the disease related genes.Jasmonate signalling plays a role in defence against Blumeria graminis f.sp.tritici.and future manipulation of this
为了解目前普通小麦育成品种（系）间醇溶蛋白的遗传多样性,利用酸性聚丙烯酰胺凝胶电泳（Acidpolyacrylamide gel electrophoresis,A-PAGE）技术对国内99份小麦新品种（系）进行了醇溶蛋白分析。结果表明,供试材料中共分离出蛋白带2 192条,迁移率不同的谱带类型106种,其中迁移率编号为9和11的2种谱带出现频率最高,均为82.11%;有38条谱带的出现频率低于10%,这些低频率谱带仅出现在极少数的材料中;其余66条谱带出现频率为10.53%~64.21%,具有较高的多态性。每个被检测材料可电泳分离出15~30条带,其中大部分为18~24条。供试材料间遗传距离（Genetic distance,GD）为0.07~0.73,平均为0.59,遗传变异较大。聚类分析可将其分为4大类。与过去的小麦品种醇溶蛋白研究结果相比,新品种（系）的平均遗传距离缩小,遗传基础变窄。
