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Effects of heat hardening on life parameters and thermostability of Bradysia odoriphaga larva and adults

文献类型： 外文期刊

作者： Zhu, Guodong 1 ; Zhao, Haipeng 2 ; Xue, Ming 2 ; Qu, Cheng 3 ; Liu, Shouzhu 1 ;

作者机构： 1.Liaocheng Univ, Coll Agron, Liaocheng, Shandong, Peoples R China

2.Shandong Agr Univ, Coll Plant Protect, Key Lab Biol Vegetable Pests & Dis, Tai An 271018, Shandong, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Beijing, Peoples R China

关键词： antioxidant responses; Bradysia odoriphaga; heat hardening; heat shock protein; life parameters; thermotolerance

期刊名称：JOURNAL OF APPLIED ENTOMOLOGY （ 影响因子：2.603； 五年影响因子：2.562 ）

ISSN： 0931-2048

年卷期：

页码：

收录情况： SCI

摘要： Environmental temperature is an important factor restricting insect population dynamics. Due to the ongoing global warming, interest in the impact of heat stress on insects has grown. High temperature in summer is a key barrier for Bradysia odoriphaga (Diptera: Sciaridae), a devastating vegetable pest o in China. It is well known that moderate thermal hardening can enhance the thermotolerance of many insects, which is beneficial for adaptation to environmental thermal stress. In order to determine whether heat hardening was beneficial for B. odoriphaga to adapt to high summer temperatures, we studied the biological performance, antioxidant responses and hsp70 and hsp90 expression of B. odoriphaga 4th instar larvae and adults after pre-exposure to mild heat hardening temperatures (30-36 degrees C). Mild heat hardening (32-36 degrees C) enhanced the larval thermal tolerance to extreme heat stress. However, life parameters were significantly inhibited, development was delayed, longevity was shortened, and fecundity was decreased. Mild heat hardening (30-34 degrees C) caused serious adverse effects on life parameters and less enhancement of heat resistance for 4th instar larvae. Mild heat hardening at 36 degrees C weakened the heat tolerance of adults. The activity of four antioxidant enzymes in B. odoriphaga changed dramatically after heat hardening at 32-36 degrees C. During recovery at 25 degrees C, catalase (CAT), peroxidase (POD) and glutathione-S-transferase (GST) in tested larvae maintained successive higher activities after heat hardening. Simultaneously, the expression levels of hsp70 and hsp90 increased significantly after thermal hardening. Higher expression levels were also detected in larvae, pupae and adults after 48 hr recovery at 25 degrees C. Overall, mild heat hardening played an important role in heat tolerance plasticity of B. odoriphaga larvae, and the antioxidant system and hsp70 and hsp90 genes were extremely relevant to this adaptation process.

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