Physiological and biochemical responses in sunflower leaves infected by Sclerotinia sclerotiorum

文献类型： 外文期刊

第一作者： Liu, Jia

作者： Liu, Jia;Liu, Jia;Zhang, Yunhua;Meng, Qinglin;Shi, Fengmei;Ma, Ligong;Li, Yichu

作者机构：

关键词： Antioxidant enzymes;Phytohormone;Physiological response;Resistance mechanisms;Sclerotinia sclerotiorum;Sunflower

期刊名称：PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY （ 影响因子：2.747； 五年影响因子：2.388 ）

ISSN： 0885-5765

年卷期： 2017 年 100 卷

页码：

收录情况： SCI

摘要： Sclerotinia sclerotiorum is a necrotrophic fungal pathogen that causes severe yield loss of sunflower, an economically important oilseed crop. Despite years of effort to understand resistance mechanisms of sunflower toward S. sclerotiorum, such knowledge, however, is still far from complete. We assessed physiological and biochemical responses following S. sclerotiorum invasion, over a 72-h time-course, in two sunflower varieties-a resistant variety (var.) Fengkuiza No. 1 and a susceptible var. 7101. Activities of several antioxidant enzymes were found to be altered by pathogen infection in both varieties. Moreover, the concentration of two stress-inducible phytohormones-salicylic acid and abscisic acid-were dramatically elevated by S. sclerotiorum infection. Similarly, upon infection, levels of total protein, carbohydrates, and chlorogenic acid were significantly higher in leaves of the resistant var. than in those of the susceptible var., indicating a positive correlation between resistance and these indicative indexes. In contrast, the malondialdehyde (MDA) level was found to be negatively correlated with sunflower resistance to S. sclerotiorum. Findings from this study improve knowledge of sunflower resistance toward S. sclerotiorum and provide an inventory of potential indicators for future sunflower screening and breeding with an aim toward enhanced resistance. (C) 2017 Elsevier Ltd. All rights reserved.

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