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中国农学通报 ›› 2022, Vol. 38 ›› Issue (35): 111-118.doi: 10.11924/j.issn.1000-6850.casb2021-1144

所属专题: 生物技术

• 畜牧·动物医学·蚕·蜂 • 上一篇    下一篇

高温胁迫对耐受性不同的家蚕品种幼虫抗氧化酶活与基因表达的影响

肖阳(), 李庆荣, 邢东旭, 杨琼()   

  1. 广东省农业科学院蚕业与农产品加工研究所,广州 510610
  • 收稿日期:2021-11-29 修回日期:2022-01-15 出版日期:2022-12-15 发布日期:2022-12-09
  • 通讯作者: 杨琼
  • 作者简介:肖阳,女,1982年出生,湖南长沙人,副研究员,硕士研究生,主要从事家蚕育种与分子机理方面的研究。通信地址:510610 广东省广州市天河区东莞庄一横路蚕业所,Tel:020-89282649,E-mail:xiaoyang@gdaas.cn
  • 基金资助:
    国家自然科学基金项目“家蚕化学感受蛋白BmCSPs 基因在高温应答中的功能解析”(31802135);2022年省级乡村振兴战略专项资金种业振兴项目“家蚕核心种源创新培育提升与示范推广”;广东省现代农业产业技术体系(蚕桑)(2022KJ124);2022年度高水平广东省农业科技示范市建设资金市院合作项目“佛山基塘农业研究院”

Effects of High Temperature Stress on Antioxidant Enzyme Activity and Gene Expression in Larvae of Silkworm Varieties with Different Tolerance

XIAO Yang(), LI Qingrong, XING Dongxu, YANG Qiong()   

  1. Sericulture & Agri-food Research Institute, Guangdong Academy of Agriculture Sciences, Guangzhou 510610
  • Received:2021-11-29 Revised:2022-01-15 Online:2022-12-15 Published:2022-12-09
  • Contact: YANG Qiong

摘要:

探讨高温环境对家蚕血淋巴中抗氧化酶活性及其基因表达的影响,为家蚕对高温环境胁迫的应答生理与分子适应机制的揭示提供参考。本实验以高温耐受性家蚕品种932G与敏感性品种HY为研究对象,采用实时荧光定量PCR等方法测定高温胁迫下5龄幼虫血淋巴中的抗氧化酶活性及酶基因表达水平的变化。实验结果表明,受35℃高温胁迫后,耐受性品种与敏感性品种血淋巴中SOD、CAT和GST的相对酶活力变化趋势相似,均为胁迫前期变化幅度较小,中后期显著升高,胁迫后期显著降低,整体变化趋势为先升高后降低。酶基因相对表达水平与酶活变化趋势基本一致,在胁迫中后期出现不同程度的升高,胁迫后期有所降低,但品种间变化幅度有差异,BmSOD与绝大多数BmGSTs基因的相对表达量以耐受性品种的升高幅度较大,而BmCAT则以敏感性品种的升高幅度较大。由此可见,抗氧化酶SOD、CAT和GST在蚕体血淋巴组织中的高温响应趋势较为一致,仅在品种间存在变化幅度的差异。

关键词: 高温胁迫, 耐受性, 抗氧化酶活, 基因表达, 家蚕

Abstract:

The effects of high temperature environment on antioxidant enzyme activity and gene expression in hemolymph of silkworm were explored, which may provide reference for revealing the physiological and molecular adaptation mechanism of silkworm to high temperature environmental stress. The tolerant variety to high temperature 932G and sensitive variety HY were taken as the studied objects, and the changes of antioxidant enzyme activities and enzyme gene expression levels in the hemolymph of the 5th instar larvae under high temperature stress were measured by real-time fluorescence quantitative PCR. The results showed that under 35℃ high temperature stress, the change trend of relative activities of SOD, CAT and GST in tolerant variety and sensitive variety were similar. The change ranges were all small in the early stage of stress, then increased significantly in the middle and late stages, and decreased significantly in the final stage of stress. The overall change trend was first increase then decrease. The relative expression levels of enzyme genes increased in varying degrees in the middle and late stages of stress, and decreased in the final stage of stress, which were basically consistent with the change trend of enzyme activities, but the change ranges among the varieties were different. The relative expression levels of BmSOD and most of BmGSTs genes increased significantly in tolerant variety, while that of BmCAT increased significantly in sensitive variety. In conclusion, the high temperature response trend of antioxidant enzymes SOD, CAT and GST in silkworm hemolymph are relatively consistent, and there are only differences in the change ranges among the varieties.

Key words: high temperature stress, tolerance, antioxidant enzyme activity, gene expression, Bombyx mori

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