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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2015年52 No.4

Differences in heat tolerance and physio-biochemical mechanisms between adult female and male Calliptamus italicus (Orthopera:Acrididae)
Author of the article:LI Shuang** WANG Dong-Mei LI Juan HU Hong-Xia JI Rong***
Author's Workplace:College of Life Sciences, Xinjiang Normal University, Key Laboratory of Conservation Biology and Management for Xinjiang Special Species, National Central for International Joint Research on Cross-border Pest Management in Central Asia, Urumqi 830054, China
Key Words:Calliptamus italicus (L.),heat tolerance,mortality,stress resistant substances
Abstract:[Objectives]  Calliptamus italicus is a major plague pest species in the arid and semi-arid grasslands of Xinjiang. Previous studies claimed that outbreaks of this pest were closely related to climate warming in Xinjiang since the 1980s. Females outnumbered males in natural populations. This study aimed to explore differences in heat tolerance between adult females and males, including the physiological and biochemical mechanisms underlying these differences. [Methods]  The free water/combined water, trehalose, soluble protein, oleic acid, linoleic acid and linolenic acid content of females and males was measured after adults were placed into a climate cabinet under consistent temperature regimes of 27-48at 3 intervals for 4 h. [Results]  Mortality of females and males did not significantly differ when exposed to < 39 (P0.05), whereas the mortality of males was significantly higher than that of females when exposed to temperatures > 39 (P0.05). Mortality of both sexes reached 100% at 51. The contents of the six stress resistant substances in females and males showed a trend of first increasing, then decreasing, with temperature. Although the free water/combined water ratios of females and males were not significantly different under different temperatures (P0.05), their trehalose and oleic acid contents were significantly different (P0.05). The linolenic acid content of females and males was also significantly different (P0.05) at all temperatures other than 45, and soluble protein content was also significantly different between the sexes (P0.05) at all temperatures other than 27 and 48.There was no apparent regulation of the change in linoleic acid content. The accumulation rates of the six stress resistant substances differed with temperature; unsaturated fatty acids had the highest accumulation rate, peaking at 82.53% and 117.13% for females and males, respectively. [Conclusion]  C. italicus can adapt to higher temperatures by accumulating stress resistant substances, and females have higher capacity for heat tolerance than males.
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