低湿胁迫下卡森斯氏线虫0657L和短尾异小杆线虫0641TY的避逆策略

doi:10.16409/j.cnki.2095-039x.2022.03.016

摘要/Abstract

摘要： 低湿胁迫下，昆虫病原线虫呈现耐受行为特征，这直接影响和决定昆虫病原线虫对逆境的适应度和对害虫的控制效能。为阐明昆虫病原线虫对低湿胁迫的行为响应，本试验用卡森斯氏线虫Steinernema kraussei 0657L和短尾异小杆线虫Heterorhabditis brevicaudis 0641TY品系作为研究对象，观察这两种昆虫病原线虫在30%低湿度环境中的行为特征，分析其避逆策略。结果显示，两种昆虫病原线虫在低湿环境中各种避逆行为表现能力不同，卡森斯氏线虫0657L表现出较强的避逆迁移能力，短尾异小杆线虫0641TY的抱团能力强。两种昆虫病原线虫应对低湿胁迫的避逆策略不同，卡森斯氏线虫0657L表现为干燥逃避，短尾异小杆线虫0641TY表现为低湿休眠。两种昆虫病原线虫的避逆行为会受环境中的干扰因素发生变化，但是避逆策略不会发生改变。在水或者昆虫体液存在的低湿环境中，卡森斯氏线虫0657L的迁移能力下降，短尾异小杆线虫0641TY的迁移能力得到增强，抱团能力下降。

关键词: 昆虫病原线虫, 低湿胁迫, 避逆策略

Abstract: Under low humidity stress, entomopathogenic nematodes exhibit resistance characteristics, which directly affect and determines the adaptability of entomopathogenic nematodes to stress and the control efficiency of insect pests. Steinernema kraussei 0657L and Heterorhabditis brevicaudis 0641TY were used in this study to elucidate the behavioral responses of entomopathogenic nematodes to low humidity stress. The behavior characteristics of these two nematode species in low humidity environment of 30% RH were observed and their avoidance strategies were analyzed. The results revealed that S. kraussei 0657L showed dry escape, while H. brevicaudis 0641TY showed low moisture dormancy. S. kraussei 0657L showed a strong ability to leave stress, while H. brevicaudis 0641TY showed a strong ability to form a group. Environmental factors might disturb the stress avoiding behaviors in the two nematode species, but their avoidance strategy did not change. In the low-humidity environment with water or insect body fluid, the migration ability of S. kraussei 0657L decreased, while the migration ability of H. brevicaudis 0641TY was enhanced and the group holding ability decreased.

Key words: entomopathogenic nematodes, low humidity stress, avoidance strategy

中图分类号:

S476

张晓波, 朱小芳, 钱秀娟. 低湿胁迫下卡森斯氏线虫0657L和短尾异小杆线虫0641TY的避逆策略[J]. 中国生物防治学报, 2023, 39(2): 320-330.

ZHANG Xiaobo, ZHU Xiaofang, QIAN Xiujuan. Responses of Steinernema kraussei 0657L and Heterorhabditis brevicaudis 0641TY to Low Humidity Stress[J]. Chinese Journal of Biological Control, 2023, 39(2): 320-330.

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