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首页> 外文期刊>Biology Open >Cold adaptive potential of pine wood nematodes overwintering in plant hosts
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Cold adaptive potential of pine wood nematodes overwintering in plant hosts

机译：植物宿主中松木线虫越冬的冷适应潜力

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The pine wood nematode (PWN;Bursaphelenchus xylophilus) is the causal agent of pine wilt disease, which results in severe ecological and economic losses in coniferous forests. During overwintering, PWNs undergo morphological and physiological changes to adapt to low temperature environments. Here, the physiological changes of the PWN populations sampled in the summer and winter were compared to analyze the role of low temperatures in their response. The PWN overwinters as third-stage dispersal juveniles, which showed significantly greater survival rates than summer populations (propagative forms) at sub-zero temperatures. The major biochemical compounds in the populations were analyzed by gas chromatography. Eight dominant fatty acids, with stearic acid being the most important, were identified from PWN propagative stage and third-stage dispersal stage. Compared with the propagative stage, the dispersal stage showed significant increases in the fatty acid content and the proportion of unsaturated fatty acids. Three carbohydrates, trehalose, glycerol and glucose, were detected in the PWN. Compared with the summer population, the levels of trehalose and glycerol increased significantly, while glucose decreased, in the winter population. The modifications in fatty acid composition and cryoprotectant levels, as elements of its changing physiology, play important roles in the overwintering success of the PWN.
机译：松木线虫（PWN; Bursaphelenchus xylophilus）是松树枯萎病的病原体，在针叶林中造成严重的生态和经济损失。在越冬期间，PWN会发生形态和生理变化，以适应低温环境。在这里，比较了夏季和冬季采样的PWN种群的生理变化，以分析低温在其响应中的作用。 PWN越冬越是第三阶段的散布少年，在零度以下温度下，其存活率比夏季种群（繁殖体）高得多。通过气相色谱法分析了种群中的主要生化化合物。从PWN繁殖阶段和第三阶段分散阶段确定了八种主要脂肪酸，其中硬脂酸是最重要的。与繁殖阶段相比，分散阶段的脂肪酸含量和不饱和脂肪酸的比例明显增加。在PWN中检测到三种碳水化合物，海藻糖，甘油和葡萄糖。与夏季人群相比，冬季人群中海藻糖和甘油的水平显着增加，而葡萄糖降低。作为其不断变化的生理因素，脂肪酸组成和防冻剂含量的改变在PWN的越冬成功中起着重要作用。

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