首页> 外文期刊>Russian Journal of Plant Physiology >Tenuazonic acid, toxin of rice blast fungus, induces disease resistance and reactive oxygen production in plants.
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Tenuazonic acid, toxin of rice blast fungus, induces disease resistance and reactive oxygen production in plants.

机译:稻瘟病菌毒素Tenuazonic acid可诱导植物抗病和产生活性氧。

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摘要

Effects of tenuazonic acid (TA) on rice leaf segments and on their interaction with compatible races of the blast fungus (Magnaporthe grisea, former name is Pyricularia oryzae) were studied. TA induced small brown necrotic spots on leaves. Application of TA (1 or 5 mM) to leaves in mixtures with M. grisea spores induced a local disease resistance, which reduced the frequency of compatible lesions. TA was not fungitoxic but, in contact with the leaf, increased the capability of leaf diffusates to inhibit germination of M. grisea spores. In the infected leaves, the diffusate fungitoxicity was higher than in the healthy ones. Antioxidant enzymes, superoxide dismutase and catalase, and scavengers of hydroxyl radical, mannitol and formate, strongly inhibited the TA-induced diffusate fungitoxicity. It is suggested that the disease resistance induced by TA is mediated, at least partially, by generation of reactive oxygen species by rice leaves, which inhibit the development of the fungus directly or indirectly.
机译:研究了tenuazonic acid(TA)对稻叶片段及其与稻瘟病菌(稻瘟病菌,原名Pyricularia oryzae)的相容小种相互作用的影响。 TA诱导叶片上出现小的褐色坏死斑。将TA(1或5 mM)施用到与稻瘟病菌孢子混合的叶片中可引起局部抗病性,从而降低了相容性病斑的发生频率。 TA没有真菌毒性,但是与叶接触增加了叶扩散抑制稻瘟病菌孢子萌发的能力。在被感染的叶片中,扩散的真菌毒性高于健康叶片。抗氧化酶,超氧化物歧化酶和过氧化氢酶以及羟自由基,甘露醇和甲酸的清除剂强烈抑制了TA诱导的扩散性真菌毒性。提示TA诱导的抗病性至少部分地通过稻叶产生活性氧来介导,所述活性氧直接或间接抑制真菌的发育。

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