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作物学报 ›› 2016, Vol. 42 ›› Issue (09): 1374-1380.doi: 10.3724/SP.J.1006.2016.01374

• 耕作栽培·生理生化 • 上一篇    下一篇

高温胁迫对Bt棉蕾中杀虫蛋白含量及氮代谢的影响

衡丽1,李亚兵2,胡大鹏1,王桂霞1,吕春花1,张祥1,陈源1,陈德华1,*   

  1. 1扬州大学农学院 / 江苏省作物遗传生理重点实验室，江苏扬州225009；2中国农业科学院棉花研究所，河南安阳 455000
  • 收稿日期:2016-03-14 修回日期:2016-06-20 出版日期:2016-09-12 网络出版日期:2016-06-27
  • 通讯作者: 陈德华, E-mail: cdh@yzu.edu.cn, Tel: 18051058960
  • 基金资助:

    本研究由国家自然科学基金项目(31171479, 31301263, 31471435), 教育部博士学科点专项基金(博导类)项目(20113250110001), 江苏省三新工程项目(SXGC(2014)317)和江苏省高等教育优势学科发展计划项目资助。

Effect of High Temperature Stress on Bt Insecticidal Protein Content and Nitrogen Metabolism of Square in Bt Cotton

HENG Li,HU Da-Peng,WANG Gui-Xia,LYU Chun-Hua,ZHANG Xiang,CHEN Yuan,CHEN De-Hua*   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province / College of Agriculture, Yangzhou University, Yangzhou 225009, China?
  • Received:2016-03-14 Revised:2016-06-20 Published:2016-09-12 Published online:2016-06-27
  • Contact: 陈德华, E-mail: cdh@yzu.edu.cn, Tel: 18051058960
  • Supported by:

    The research was supported by the National Natural Science Foundation of China (31171479, 31301263, 31471435), the Ministry of Education Research Fund for the Doctoral Program (20113250110001), Jiangsu “Three-innovation” Agricultural Project [SXGC(2014)317], and the Development Plan of Higher Education Advantaged Discipline in Jiangsu Province.

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摘要：

为明确高温气候下Bt棉抗虫性下降的原因，以2个不同类型Bt棉品种为材料，2011年于盛蕾期设计38℃高温胁迫3、5和7 d；2012年设计38℃/25℃的昼夜变温胁迫4、7和10 d，研究其对转Bt棉蕾的杀虫蛋白表达量影响及其生理机理。结果表明，持续高温胁迫7 d内，棉蕾中Bt杀虫蛋白含量呈下降趋势，持续胁迫3 d内下降幅度最大，与未胁迫相比，泗抗3号和泗抗1号分别下降18.71%和26.54%；昼夜变温下高温胁迫4 d时蕾中Bt杀虫蛋白表达量无显著变化，当胁迫7 d以上时，Bt杀虫蛋白含量显著下降，泗抗3号和泗抗1号分别比对照下降11.32%和14.18%。持续高温或昼夜变温高温持续胁迫下，棉蕾中游离氨基酸含量和蛋白酶活性都显著增加，可溶性蛋白含量和GPT活性都显著下降。相关分析表明，游离氨基酸含量、蛋白酶活性与Bt杀虫蛋白含量呈极显著负相关；可溶性蛋白含量和GPT活性与Bt杀虫蛋白含量呈极显著正相关。分析表明，高温胁迫下蛋白质合成功能下降，分解能力增强导致可溶蛋白含量，包括Bt杀虫蛋白含量下降。常规种泗抗1号的抗虫性和氮代谢受高温的影响较大。

关键词: Bt棉, 蕾, Bt杀虫蛋白, 氮代谢, 高温胁迫

Abstract:

To explore the reason for low insect resistance under high temperature climate in Bt cotton production, we selected two Bt cotton cultivars as experimental material with treatments of 38°C for three, five and seven days in 2011, and 38°C/25°C at day /night for four, seven and ten days, respectively at the artificial climate chamber in 2012. The results showed that the Bt insecticidal protein contents declined within seven days under 38℃, with the largest reduction occurred within three days. Compared with control, the square Bt insecticidal protein contents decreased by 18.71% and 26.54% for cultivar Sikang3 and Sikang1, respectively. Under 38°C/25°C at day /night , the square Bt insecticidal protein contents had no obvious reduction within four days, and significant reduced after seven days with the reduction of 11.32% for SK-3and 14.18% for SK-1. Under the treatment conditions the soluble protein contents, glutamate pyruvate transaminase (GPT) activities reduced, but the free amino acid contents, protease activities increased. There existed significant negative correlation of insecticidal protein content with free amino acid contents, and protease activities ; and significantly positive correlation of insecticidal protein content with soluble protein contents, and GPT activities under high temperature stresses. Therefore, the reduced synthesis and the enhanced degradation for protein in the square under the high temperature condition resulted in the decrease of soluble protein content, including Bt insecticidal protein content. The larger reductions of the square Bt insecticidal protein content and nitrogen metabolic strength were detected in cultivar Sikang1 as confound with cultivar SK-3 under the high temperature treatments.

Key words: Bt cotton, Square, Bt insecticidal protein, Nitrogen metabolism, High temperature stress

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