Scientific Observing and Experimental Station of Crop Pests in Korla, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, China.
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
J Chem Ecol. 2021 Jan;47(1):87-98. doi: 10.1007/s10886-020-01236-9. Epub 2021 Jan 6.
Plant-derived volatiles play a significant role in host selection of phytophagous insects, but their role in seasonal host shifts remain unclear. The polyphagous mirid bug Apolygus lucorum displays marked seasonal host alternation. During summer, volatiles from flowering plants play a key role in A. lucorum foraging. Though A. lucorum adults deposit overwintering eggs on jujube (Ziziphus jujuba) and grape (Vitis vinifera) during autumn, it is unclear whether plant volatiles equally mediate this host selection behavior. During 2015 and 2016, we found that population densities of A. lucorum adults on cotton (Gossypium hirsutum) during August were higher than those in September, whereas the opposite pattern was observed on fruit trees (i.e., jujube and grape). The dispersal factor of the adult population that dispersed from cotton fields during September was higher than in August, whereas opposite patterns were observed in the neighboring jujube/grape orchard. In Y-tube olfactometer trials, A. lucorum adults preferred cotton plant volatiles over fruit tree odors in August, whereas the opposite patterns were found in September. Three electro-physiologically active volatiles (butyl acrylate, butyl propionate and butyl butyrate) were identified from jujube and grape plants. During September, active volatiles are emitted in considerably greater amounts by jujube and grape than in August, while the amount of volatile emissions in cotton decreases in September. Temporal shifts in plant volatile emission thus may modulate host plant foraging of A. lucorum, and appear to guide its colonization of different host plants. Our findings help understand the role of plant volatiles in the host plant selection and seasonal dynamics of polyphagous herbivores.
植物源挥发物在植食性昆虫的寄主选择中起着重要作用，但它们在季节性寄主转移中的作用仍不清楚。多食性盲蝽 Apolygus lucorum 表现出明显的季节性寄主交替。在夏季，开花植物的挥发物在 A. lucorum 的觅食中起着关键作用。尽管 A. lucorum 成虫在秋季会在枣（Ziziphus jujuba）和葡萄（Vitis vinifera）上产卵越冬，但尚不清楚植物挥发物是否同样介导了这种寄主选择行为。在 2015 年和 2016 年，我们发现，8 月棉田 A. lucorum 成虫的种群密度高于 9 月，而果树（即枣和葡萄）上的情况则相反。9 月从棉田扩散的成虫种群的扩散因子高于 8 月，而在相邻的枣/葡萄园则相反。在 Y 型嗅觉仪试验中，8 月 A. lucorum 成虫更喜欢棉花植物挥发物而不是果树气味，而 9 月则相反。从枣和葡萄植物中鉴定出三种电生理活性挥发物（丙烯酸丁酯、丙酸丁酯和丁酸丁酯）。9 月，枣和葡萄挥发物的排放量明显高于 8 月，而棉花的挥发物排放量在 9 月减少。因此，植物挥发物的时间变化可能调节 A. lucorum 对寄主植物的觅食，并似乎指导其对不同寄主植物的定殖。我们的发现有助于理解植物挥发物在多食性植食性昆虫的寄主植物选择和季节性动态中的作用。
