文献类型： 外文期刊
作者： Zhai, Yifan 1 ; Zhang, Xiaoyan 1 ; Yin, Zhenjuan 1 ; Zhu, Qisong 1 ; Tao, Mei 1 ; Yu, Yi 1 ; Zheng, Li 1 ;
作者机构： 1.Shandong Acad Agr Sci, Inst Plant Protect, Jinan 250100, Shandong, Peoples R China
2.Yunnan Agr Univ, Coll Plant Protect, Kunming 650000, Yunnan, Peoples R China
3.Shandong Rice Res Inst, Jinan 250100, Shandong, Peoples R China
关键词： Laodelphax striatellus; nymphal diapause; cold hardiness
期刊名称：JOURNAL OF ENTOMOLOGICAL SCIENCE （ 影响因子：0.618； 五年影响因子：0.769 ）
ISSN： 0749-8004
年卷期： 2018 年 53 卷 2 期
页码：
收录情况： SCI
摘要： Diapause, an important developmental process in insects, is a physiological adaptation for avoiding adverse environmental conditions. Laodelphax striatellus Fallen is an important graminaceous crop pest in East Asia, and there are few reports regarding the nymphal diapause from fields with rice-wheat rotation. In the present study, we determined the fourth-instar nymph as the main diapause stage through investigation under field and laboratory conditions. Developmental duration of the third and fourth instars was longer during the short day-length (10 h light: 14 h dark [10L:14D]) at 20 degrees C than during other photoperiods. The third-instar nymph is the most sensitive stage to changes in the photoperiod. The optimal environmental factor for diapause termination was long day-length (16L:8D) at 25 to 28 degrees C. The supercooling point was significantly reduced in diapause nymphs, and activities of trehalase, pyruvate kinase, and sorbitol dehydrogenase were significantly decreased (46.46, 37.90, and 17.64%, respectively). The information obtained in this study may be beneficial to the development of control strategies for this pest.
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