Li Hong-Ru, Xiang Hui-Min, Zhong Jia-Wen, Ren Xiao-Qiao, Wei Hui, Zhang Jia-En, Xu Qiu-Yuan, Zhao Ben-Liang
Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou 510642, China.
Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Plants (Basel). 2020 Jul 13;9(7):881. doi: 10.3390/plants9070881.
Worldwide, rice blast () causes more rice crop loss than other diseases. Acid rain has reduced crop yields globally for nearly a century. However, the effects of acid rain on rice- systems are still far from fully understood. In this study, we conducted a lab cultivation experiment of under a series of acidity conditions as well as a glasshouse cultivation experiment of rice that was inoculated with either before ( + SAR) or after (SAR + ) simulated acid rain (SAR) at pH 5.0, 4.0, 3.0 and 2.0. Our results showed that the growth and pathogenicity of was significantly inhibited with decreasing pH treatments in vitro culture. The SAR + treatment with a pH of 4.0 was associated with the highest inhibition of expansion. However, regardless of the inoculation time, higher-acidity rain treatments showed a decreased inhibition of via disease-resistance related enzymes and metabolites in rice leaves, thus increasing disease index. The combined effects of high acidity and fungal inoculation were more serious than that of either alone. This study provides novel insights into the effects of acid rain on the plant-pathogen interaction and may also serve as a guide for evaluating disease control and crop health in the context of acid rain.
在全球范围内，稻瘟病导致的水稻作物损失比其他病害更多。近一个世纪以来，酸雨已使全球农作物产量下降。然而，酸雨对水稻系统的影响仍远未得到充分了解。在本研究中，我们在一系列酸度条件下进行了稻瘟病菌的实验室培养实验，以及在pH值为5.0、4.0、3.0和2.0的模拟酸雨（SAR）处理之前（+SAR）或之后（SAR+）接种稻瘟病菌的水稻温室培养实验。我们的结果表明，在体外培养中，随着pH处理值的降低，稻瘟病菌的生长和致病性受到显著抑制。pH值为4.0的SAR+处理对稻瘟病菌扩展的抑制作用最强。然而，无论接种时间如何，较高酸度的降雨处理通过水稻叶片中与抗病相关的酶和代谢产物对稻瘟病菌的抑制作用减弱，从而增加了病害指数。高酸度和真菌接种的联合作用比单独作用更严重。本研究为酸雨对植物-病原体相互作用的影响提供了新的见解，也可为在酸雨背景下评估病害控制和作物健康提供指导。
