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An egg parasitoid assesses host egg quality from afar using oviposition-induced plant volatiles

文献类型： 外文期刊

作者： Tian, Zhiqiang 1 ; Wang, Yuanyuan 2 ; Sun, Tao 1 ; Hu, Xiaoyun 1 ; Hao, Wanting 1 ; Zhao, Te 4 ; Wang, Yanan 1 ; Zhang, Lei 2 ; Jiang, Xingfu 2 ; Turlings, Ted C. J. 1 ; Li, Yunhe 1 ;

作者机构： 1.Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, State Key Lab Cotton Biobreeding & Integrated Util, Kaifeng 475004, Peoples R China

2.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

3.Weifang Vocat Coll, Coll Agr & Forestry Sci & Technol, Weifang 262737, Peoples R China

4.Henan Agr Univ, Colleage Plant Protect, Zhengzhou 450046, Peoples R China

5.Univ Neuchatel, Lab Fundamental & Appl Res Chem Ecol, CH-2000 Neuchatel, Switzerland

6.Penn State Univ, Dept Entomol, University Pk, PA 16802 USA

期刊名称：CURRENT BIOLOGY （ 影响因子：7.5； 五年影响因子：9.3 ）

ISSN： 0960-9822

年卷期： 2025 年 35 卷 13 期

页码：

收录情况： SCI

摘要： Parasitoids of herbivores exploit inducible plant volatiles to find plants with potential hosts from a distance, whereas at close range they typically use host-derived cues to pinpoint and identify suitable hosts. Here, we show, however, that the egg parasitoid Trichogramma japonicum assesses host egg quality far more efficiently by remotely using oviposition-induced plant volatiles (OIPVs). In olfactometer assays, female T. japonicum wasps showed a strong preference for the odor of rice plants carrying 2-day-old eggs of the rice leaf folder Cnaphalocrocis medinalis over the odor of plants with younger or older eggs, a preference that correlated with higher parasitism rates. In accordance with the preference-performance hypothesis, the offspring of T. japonicum showed superior performance in 2-day-old eggs, including shorter development times and higher eclosion rates. Volatile analysis revealed significantly increased emission of D-limonene and alpha-pinene from plants with 2-day-old eggs, and we found that synthetic versions of these two monoterpenes were highly attractive to the wasp. Knockout rice plants deficient in D-limonene and alpha-pinene synthesis lost their appeal to the wasps, but attraction could be restored by dispensing synthetic versions of the attractants alongside the knockouts. These findings reveal a novel and highly efficient host-assessment strategy in egg parasitoids, whereby plant-provided cues inform the wasps about host quality from afar. This discovery is illustrative of the clever strategies that have evolved out of plant-insect interactions and offers fresh ideas to optimally exploit plant traits for biocontrol approaches against C. medinalis, a major rice pest.

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