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首页> 外文期刊>Plant Pathology >Biochemical responses to uitravioiet-C radiation and methyl jasmonate in Pinus radiata seedlings that accompany induced resistance to Diplodia pinea
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Biochemical responses to uitravioiet-C radiation and methyl jasmonate in Pinus radiata seedlings that accompany induced resistance to Diplodia pinea

机译：辐射松的诱导抗性对辐射松幼苗中超紫外线C辐射和茉莉酸甲酯的生化响应

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摘要

Irradiation of Finus radiata seedlings with ultraviolet-C (UV-C) radiation or spray application of methyl jasmonate (MeJA) each resulted in induced resistance to subsequent wound inoculation with Diplodia pinea. Induced resistance was expressed by lower incidence of disease and by reduced size of stem lesions than in untreated seedlings. UV-C was more effective than MeJA and the induced resistance was greatest in seedlings that were irradiated with UV-C for 60 min, 1 week before pathogen inoculation. Induced resistance in the UV-C treated stems was concomitant with increases in peroxidase (POX) and polyphenol oxidase (PPO) activity but showed no correlation with concentrations of α-pinene and β-pinene or total phenolics. Furthermore, POX induction in stem tissue was cumulative and was greatest after three repeat treatments with UV-C at 6, 3 and 1 week before inoculation. In contrast to UV-C, MeJA induced a significant increase in β-pinene concentration in stem tissue but did not affect PPO activity. POX activity was induced by MeJA in stems, although to a lesser extent than by UV-C, but was not affected in needles. This appears to be the first report demonstrating the use of UV-C radiation to induce resistance to fungal infection in a coniferous species. The implications of the underlying differences between UV-C- and MeJA-mediated resistance to D. pinea are discussed.
机译：用紫外线-C（UV-C）辐射或辐射施用茉莉酸甲酯（MeJA）辐射无花果幼苗均导致对随后用双翅目接种的伤口产生抗药性。与未处理的幼苗相比，诱导的抗性通过较低的病害发病率和减小的茎损伤大小来表达。 UV-C比MeJA更有效，在病原菌接种前1周，用UV-C照射60分钟的幼苗诱导的抗性最大。经UV-C处理的茎中诱导的抗性与过氧化物酶（POX）和多酚氧化酶（PPO）活性的增加同时发生，但与α-pine烯和β-pine烯的浓度或总酚含量无关。此外，在接种前6、3和1周用UV-C重复3次治疗后，干组织中的POX诱导是累积的，并且最大。与UV-C相反，MeJA诱导茎组织中β-pine烯浓度显着增加，但不影响PPO活性。 MeJA诱导茎中的POX活性，虽然程度不如UV-C，但在针中不受影响。这似乎是第一个证明使用UV-C辐射诱导对针叶树种真菌感染的抵抗力的报告。讨论了UV-C和MeJA介导的对松枝线虫的抗性之间潜在差异的含义。

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