Comparative analysis of early H2O2 accumulation in compatible and incompatible wheat-powdery mildew interactions

文献类型： 外文期刊

第一作者： Li, AL

作者： Li, AL;Wang, ML;Zhou, RH;Kong, XY;Huo, NX;Wang, WS;Jia, JZ

作者机构：

关键词： compatible interaction;hypersensitivity;incompatible interaction;powdery mildew;reactive oxygen species;wheat

期刊名称：PLANT PATHOLOGY （ 影响因子：2.59； 五年影响因子：2.924 ）

ISSN： 0032-0862

年卷期： 2005 年 54 卷 3 期

页码：

收录情况： SCI

摘要： Comparative analysis was carried out for hydrogen peroxide (H2O2) accumulation in response to powdery mildew (Blumeria graminis[Erysiphe graminis] f.sp. tritici) primary germ tube (PGT) and appressorial germ tube (AGT) contact, and in papilla (cell wall apposition) and hypersensitive responses (HR) in wheat (Triticum aestivum). Using primary leaves of three susceptible wheat lines (Bainong 3217; Beijing 837; Jingshuang 16) and five resistant lines [Mardler (Pm2 + Pm6); Ulka/8 x Cc (Pm2); Mardler/7 x Bainong 3217 (Pm2); Pm16; Pm16/7 x Beijing 837 (Pm16)], early H2O2 accumulation between 10 and 48 h after inoculation was studied. Strong H2O2 accumulation was found in effective papillae and associated cytosolic vesicles in both susceptible and resistant wheat lines, suggesting the important role of H2O2 in effective papillae formed as a general plant defence against powdery mildew. High frequency of effective papilla formation was observed in all five resistant lines. Among resistant lines, hypersensitive cell death was detected earlier in Mardler and Ulka/8 x Cc than in Pm16 and Pm16/7 x Beijing 837. In all cases this was associated with H2O2 accumulation in attacked epidermal cells. Interestingly, penetration resistance but not HR appeared to be mediated by the Pm2 gene in the Mardler/7 x Bainong 3217 line, suggesting that Pm2 may govern an HR-independent defence pathway in this genetic background. As effective papillae and HR did not occur in the same cells, papilla deposition may be independent of the HR response, despite the fact that both defence mechanisms were associated with high H2O2 accumulation. In wheat powdery mildew-incompatible interactions, HR acts as a second line of defence to contain infection when the papilla defence fails.

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