JUVENILE HORMONE CHANGES ASSOCIATED WITH DIAPAUSE INDUCTION, MAINTENANCE, AND TERMINATION IN THE BEET WEBWORM, Loxostege sticticalis (LEPIDOPTERA: PYRALIDAE)

文献类型： 外文期刊

第一作者： Jiang, Xingfu

作者： Jiang, Xingfu;Huang, Shaohong;Luo, Lizhi

作者机构：

关键词： HPLC;juvenile hormone titer;Loxostege sticticalis;larval diapause

期刊名称：ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：1.698； 五年影响因子：1.758 ）

ISSN： 0739-4462

年卷期： 2011 年 77 卷 3 期

页码：

收录情况： SCI

摘要： At 22 degrees C and under a long-day photoperiod of L: D 16: 8, all the last fifth instar Loxostege sticticalis larvae undergo prepupal stage and pupate without diapause. Under a short-day photoperiod of L: D 12: 12, in contrast, they all enter diapause with approximately 36 days diapause maintenance and then terminate diapause spontaneously, although only 44% of the larvae terminated diapause successfully. Changes in hemolymph juvenile hormone (JH I) titers of diapause-destined larvae across diapause induction, maintenance and termination were examined using HPLC, and were compared with those of non-diapause-destined larvae from the fifth instar through pupation. JH I titer of the earliest fifth instar diapause-destined larvae remained at a high level with a peak of 220.4 ng/ml, though it decreased continuously to a minimum of 69.0 ng/ml on day 5 in the fifth instar when the larvae stopped feeding to enter diapause. During the diapause maintenance, JH I titer of the mature larvae increased significantly and maintained a high level until day 31 in prepupae. JH I titer declined and fluctuated at low level from 5 days before pupation. In contrast, JH I titer of both the fifth instar non-diapause-destined larvae and prepupae remained and fluctuated at low level consistently, as well as decreased before pupation. These results indicate that diapause induction and maintenance in this species might be a consequence of high JH, whereas diapause termination can be attributed to low JH titer, which was in agreement with the hormonal regulation observed in many other larval-diapausing insects. (C) 2011 Wiley Periodicals, Inc.

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