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首页> 外文期刊>Forest Pathology >Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet-C radiation
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Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet-C radiation

机译：使用茉莉酸甲酯和紫外线-C辐射增强辐射松幼苗对弯曲弯曲的抵抗力（Colletotrichum acutatum）

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摘要

Colletotrichum acutatum is a fungal pathogen that causes terminal crook disease in radiata pine (Pinus radiata) seedlings in New Zealand forest nurseries. Symptoms of infection include malformation or death of the growing tip and a stiffening and thickening of the stem. Although the disease can be managed effectively using fungicides, the New Zealand forest industry is interested in alternative control options such as induced resistance. The aim of this study was to evaluate spray application of chitosan (1.4g/l) or 2.25mm methyl jasmonate (MeJA) and irradiation with UV-C (2.16kJ/m(2)) for their potential to induce resistance to terminal crook. The treatments were applied to 4-month-old seedlings at 1week before pathogen inoculation. By the end of the experimental period (42days after inoculation), there was 80% disease incidence in the controls, with 48% of seedlings exhibiting severe terminal crook symptoms. The most effective treatment (p0.05) was MeJA with 16% disease incidence and none with severe symptoms. UV-C also significantly (p0.05) reduced infection with 52% incidence and 20% of seedlings exhibiting severe symptoms. Chitosan did not reduce disease incidence (72%) compared with the control (80%) but did significantly reduce (p0.05) disease severity with 28% exhibiting severe symptoms. MeJA was the only treatment that significantly (p0.05) reduced the detrimental effects of infection on seedling apical growth and stem diameter. To our knowledge, this is the first report demonstrating the potential for MeJA and UV-C to control terminal crook in radiata pine.
机译：Colcutotrichum acutatum是一种真菌病原体，在新西兰森林苗圃的辐射松（Pinus radiata）幼苗中引起终末弯曲病。感染的症状包括生长尖端的畸形或死亡以及茎变硬和变粗。尽管可以使用杀真菌剂有效地控制该病，但新西兰林业界对替代控制方法（如诱导抗性）感兴趣。这项研究的目的是评估壳聚糖（1.4g / l）或2.25mm茉莉酸甲酯（MeJA）的喷雾施用以及UV-C（2.16kJ / m（2））的辐照潜力，以诱导其抗最终弯曲性能。在病原体接种前的第1周，将处理施用于4个月大的幼苗。到实验期结束时（接种后42天），对照组的病害发病率为80％，其中48％的幼苗表现出严重的末端弯曲症状。最有效的治疗方法（p <0.05）是MeJA，疾病发生率16％，无严重症状。 UV-C还可以显着（p <0.05）减少感染，发生率达52％，有20％的幼苗表现出严重的症状。与对照组（80％）相比，壳聚糖未降低疾病发生率（72％），但确实显着降低了疾病严重程度（p <0.05），其中28％表现出严重症状。 MeJA是唯一能够显着（p <0.05）减少感染对幼苗根尖生长和茎直径的有害影响的处理。据我们所知，这是第一份证明MeJA和UV-C控制辐射松中终端弯曲的潜力的报告。

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