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Omethoate-lnduced Changes of (+)-δ-Cadinene Synthase Activity and Gossypol Content in Cotton Seedlings 预览

Omethoate-lnduced Changes of (+)-δ-Cadinene Synthase Activity and Gossypol Content in Cotton Seedlings
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摘要 The gene expression and activity of (+)-δ-cadinene synthase during cotton development and in response to stress, as well as the spatial and temporal pattern of sesquiterpene biosynthesis, constitute one of chemical defense mechanisms in cotton plants. In order to explore the effects of omethoate on the cotton defense in relation to (+)-δ-cadinene synthase and gossypol, effects of omethoate treatments on activity of (+)-δ-cadinene synthase and gossypol content in cotton seedlings were investigated. Cotton seedlings treated with 400 mg L-1 omethoate exhibited a significant decrease in the specific activity of (+)-δ-cadinene synthase from 12 to 120 h after treating when compared to the untreated control; significantly lower (+)-δ-cadinene synthase activity was also observed in cotton seedlings treated with 200 mg L-1 omethoate from 72 to 120 h after treating; but for cotton seedlings treated with 100 mg L-1 omethoate, from 12 to 120 h after treating, no significant changes were observed for activity of (+)-δ-cadinene synthase. The gossypol content in cotton seedlings treated with 100, 200 or 400 mg L-1 omethoate for different time periods showed no significant changes compared to that of the control. These results indicated that the activity of (+)-δ-cadinene synthase in cotton seedlings in responses to exposure of omethoate at three concentrations for different time periods followed dose- and time-dependent responses to omethoate exposure. With omethoate as a chemical stress factor for cotton seedlings, the cotton defense in relation to the activity of (+)-δ-cadinene synthase in cotton seedlings may be affected by omethoate application. The gene expression and activity of (+)-δ-cadinene synthase during cotton development and in response to stress, as well as the spatial and temporal pattern of sesquiterpene biosynthesis, constitute one of chemical defense mechanisms in cotton plants. In order to explore the effects of omethoate on the cotton defense in relation to (+)-δ-cadinene synthase and gossypol, effects of omethoate treatments on activity of (+)-δ-cadinene synthase and gossypol content in cotton seedlings were investigated. Cotton seedlings treated with 400 mg L-1 omethoate exhibited a significant decrease in the specific activity of (+)-δ-cadinene synthase from 12 to 120 h after treating when compared to the untreated control; significantly lower (+)-δ-cadinene synthase activity was also observed in cotton seedlings treated with 200 mg L-1 omethoate from 72 to 120 h after treating; but for cotton seedlings treated with 100 mg L-1 omethoate, from 12 to 120 h after treating, no significant changes were observed for activity of (+)-δ-cadinene synthase. The gossypol content in cotton seedlings treated with 100, 200 or 400 mg L-1 omethoate for different time periods showed no significant changes compared to that of the control. These results indicated that the activity of (+)-δ-cadinene synthase in cotton seedlings in responses to exposure of omethoate at three concentrations for different time periods followed dose- and time-dependent responses to omethoate exposure. With omethoate as a chemical stress factor for cotton seedlings, the cotton defense in relation to the activity of (+)-δ-cadinene synthase in cotton seedlings may be affected by omethoate application.
作者 YANG Wen-ling SHI Xue-yan ZHONG Li LIANG Pei SONG Dun-lun GAO Xi-wu YANG Wen-ling, SHI Xue-yan, ZHONG Li, LIANG Pei, SONG Dun-lun and GAO Xi-wu Department of Entomology, China Agricultural University, Beijing 100193, P.R.China
出处 《农业科学学报:英文版》 SCIE CSCD 2012年第10期1682-1690,共9页 Agricultural Sciences in China
基金 Acknowledgements This work was supported by the National Natural Science Foundation of China (30771426), the National "973" Program of China (2006CB102003), the Mechanisms and Detection of Insecticide Resistance of Important Pests Insects in China and Japan (NSFC and JSPS, 30911140107), and the Program for China New Century Excellent Talents in University of China (NCET-06-0113). We thank technician Hao Xianghong, China Agricultural University, for help in finishing GC/MS experiments.
关键词 棉花幼苗 棉酚含量 酶活性 杜松 氧乐果 合成酶基因 氧化乐果 应激反应 cotton, (+)-δ-cadinene synthase, gossypol, omethoate stress, defense
作者简介 Correspondence SHI Xue-yan, Tel/Fax: +86-10-62731306, E-mail: shixueyan@cau.edu.cn; GAO Xi-wu, Tel/Fax: +86-10-62732974, E-mail: xiwugao@263.net.cn
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