Seed treatment with salicylic acid invokes defence mechanism of Helianthus annuus against Orobanche cumana

文献类型： 外文期刊

第一作者： Yang, C.

作者： Yang, C.;Hu, L. Y.;Ali, B.;Islam, F.;Zhou, W. J.;Yang, C.;Hu, L. Y.;Ali, B.;Islam, F.;Zhou, W. J.;Bai, Q. J.;Yun, X. P.;Yoneyama, K.

作者机构：

关键词： Hypersensitive response;Orobanche cumana;phytohormone;reactive oxygen species;salicylic acid;sunflower;systemic acquired resistance

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

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年卷期：

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收录情况： SCI

摘要： The root holoparasitic angiosperm sunflower broomrape (Orobanche cumana) specifically affects sunflower (Helianthus annuus) growth and causes severe damage all over the world. This investigation was designed to examine the protective effects of salicylic acid (SA) treatment to the seeds of an O. cumana-susceptible cultivar of sunflower (TK0409). Sunflower seeds were pretreated with different concentrations (0, 0.5 and 1mM) of SA and inoculated with O. cumana for 4weeks. O. cumana infection resulted in reduction in plant biomass, endogenous SA level, and the expression of SA-related genes including pal, chs and NPR1. By contrast, O. cumana infection enhanced the production of reactive oxygen species, activities of antioxidant enzymes as well as contents of phenolics and lignin. Seed treatment with 1mM SA increased sunflower biomass in terms of plant height, fresh weight and dry weight by 10%, 13% and 26%, respectively, via reducing the number and biomass of established O. cumana. The increase of hydrogen peroxide contents by 14% in the 1mM SA treated sunflower plants appeared to be because of the inhibition of ascorbate peroxidase and catalase by exogenous SA. The enhanced expression of pathogenesis-related genes (PR3 and PR12, encoding chitinase and defensin, respectively) after 4weeks of inoculation indicated that systemic acquired resistance was induced in the SA treated sunflower in which the level of endogenous SA was also elevated in a dose-dependent manner. The increased expression of a hypersensitive-responsive (HR) gene hsr indicated that the resistance of sunflowers might be associated with a hypersensitive reaction which was activated by exogenous SA treatment.

分类号： Q1-0

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