Diapause Induction and Termination in the Small Brown Planthopper, Laodelphax striatellus (Hemiptera: Delphacidae)

文献类型： 外文期刊

第一作者： Wang, LiuFeng

作者： Wang, LiuFeng;Chen, Chao;Fu, Shu;Xue, FangSen;Lin, KeJian

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 9 期

页码：

收录情况： SCI

摘要： The small brown planthopper, Laodelphax striatellus (Fallen) enters the photoperiodic induction of diapause as 3rd or 4th instar nymphs. The photoperiodic response curves in this planthopper showed a typical long-day response type with a critical daylength of approximately 11 h at 25 degrees C, 12 h at 22 and 20 degrees C and 12.5 h at 18 degrees C, and diapause induction was almost abrogated at 28 degrees C. The third stage was the most sensitive stage to photoperiod. The photoperiodic response curve at 20 degrees C showed a gradual decline in diapause incidence in ultra-long nights, and continuous darkness resulted in 100% development. The required number of days for a 50% response was distinctly different between the short-and long-night cycles, showing that the effect of one short night was equivalent to the effect of three long nights at 18 degrees C. The rearing day length of 12 h evoked a weaker intensity of diapause than did 10 and 11 h. The duration of diapause was significantly longer under the short daylength of 11 h than it was under the long daylength of 15 h. The optimal temperature for diapause termination was 26 and 28 degrees C. Chilling at 5 degrees C for different times did not shorten the duration of diapause but significantly lengthened it when chilling period was included. In autumn, 50% of the nymphs that hatched from late September to mid-October entered diapause in response to temperatures below 20 degrees C. The critical daylength in the field was between 12 h 10 min and 12 h 32 min (including twilight), which was nearly identical to the critical daylength of 12.5 h at 18 degrees C. In spring, overwintering nymphs began to emerge in early March-late March when the mean daily temperature rose to 10 degrees C or higher.

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