东南景天SaWRKY7基因对镉胁迫的响应研究

doi:10.3969/j.issn.1000-2006.201810007

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南京林业大学学报（自然科学版） ›› 2019, Vol. 43 ›› Issue (03): 59-66.doi: 10.3969/j.issn.1000-2006.201810007

东南景天SaWRKY7基因对镉胁迫的响应研究

王影^1,2,邱文敏²,李鹤²,贺雪莲²,刘明英²,韩小娇²,曲同宝^1*,卓仁英^2*

1.吉林农业大学园艺学院,吉林长春 130118; 2.中国林业科学研究院亚热带林业研究所,浙江省林木育种重点实验室,浙江杭州 311400

出版日期:2019-05-15 发布日期:2019-05-15
基金资助:
收稿日期:2018-10-09 修回日期:2018-12-24
基金项目:国家重点研发计划子课题(2016YFD080080104)。
第一作者:王影(1120637812@qq.com)。*通信作者:曲同宝(qvtb@sina.com),副教授,ORCID(0000-0002-3777-120X),负责论文框架设定与修改; 卓仁英(zhuory@gmail.com),研究员,博士,ORCID(0000-0002-7063-3714),负责指导项目的具体实施。

Research on the response of SaWRKY7 gene to cadmium stress in Sedum alfredii Hance

WANG Ying^1,2, QIU Wenmin², LI He², HE Xuelian², LIU Mingying², HAN Xiaojiao², QU Tongbao^1*, ZHUO Renying^2*

1. College of Horticulture, Jilin Agricultural University, Changchun 130118, China; 2 Key Laboratory of Tree Breeding of Zhejiang Province, The Research Institute of Subtropical of Forestry, Chinese Academy of Forestry, Hangzhou 311400, China

Online:2019-05-15 Published:2019-05-15

摘要/Abstract

摘要： 【目的】镉对植物具有高毒性,WRKY转录因子广泛参与植物逆境胁迫。研究镉诱导下WRKY基因的胁迫响应和抗性机制。【方法】以超积累型东南景天为试材,通过PCR克隆得到1个东南景天WRKY转录因子家族基因序列,结合生物信息学方法,分析其蛋白质结构和亲缘关系,构建GFP(绿色荧光蛋白)融合蛋白,观察其亚细胞定位,利用酵母验证其转录激活活性,通过qRT-PCR分析在镉胁迫下该基因的表达特性和组织特异性。【结果】获得了1条新的东南景天WRKY转录因子家族基因并命名为SaWRKY7,包含完整的开放阅读框,长度为1 011 bp,共编码336个氨基酸,为WRKY基因家族Ⅱd成员。SaWRKY7定位在细胞核,属于核蛋白,不具有转录自激活活性。SaWRKY7在东南景天的根、茎、叶中均有表达,且在根中相对有较高的表达量。与对照相比,在100 μmol/L CdCl₂处理0.5 h时,SaWRKY7在根茎叶中有较高的表达量,随后逐渐降低,属于早期诱导表达基因。【结论】SaWRKY7为WRKY转录因子家族成员,该基因定位在细胞核,不具有转录自激活活性,在早期响应镉胁迫诱导表达,推测其可能在东南景天镉积累或镉耐受过程中发挥重要作用。

Abstract: 【Objective】 Cadmium is highly toxic to plants. WRKY transcription factors are widely involved in stress response, therefor we studied the stress response and resistance mechanism of cadmium induced WRKY gene.【Method】 Gene sequences were obtained by PCR from the cDNA library of Sedum alfredii. Bioinformatics was used to analyze the protein structure.The green fluorescent protein fusion protein was constructed for the subcellular localization analysis. The transcriptional activation activity was verified with yeast. The expression characteristics and tissue specificity of the gene were analyzed by qRT-PCR under cadmium stress. 【Result】 A new member of the family of WRKY transcription factor genes was obtained and named SaWRKY7. It contained a complete open reading frame, which was 1 011 base pairs in length, encoded 336 amino acids, and was a member of the Ⅱd family of WRKY genes. SaWRKY7 was found in the nucleus, is a nucleoprotein, and showed no transcriptional activation activity. SaWRKY7 was expressed in roots, stems and leaves of S. alfredii, with relatively high expression found in roots. SaWRKY7 showed a higher expression level in the rhizomes and leaves in the 0.5 h with 100 μmol/L cadmium treatment than that of the control, and then decreased gradually; thus, it belonged to the early induced expression gene. 【Conclusion】 SaWRKY7 is a member of the family of WRKY transcription factor genes, which is found in the nucleus and does not have transcriptional self-activation activity. SaWRKY7 gene expression was induced by cadmium stress during the early stages. Results showed that SaWRKY7 might play an important role in S. alfredii response to cadmium stress.

中图分类号:

Q945.78

王影,邱文敏,李鹤,等. 东南景天SaWRKY7基因对镉胁迫的响应研究[J]. 南京林业大学学报（自然科学版）, 2019, 43(03): 59-66.

WANG Ying, QIU Wenmin, LI He, HE Xuelian, LIU Mingying, HAN Xiaojiao, QU Tongbao, ZHUO Renying. Research on the response of SaWRKY7 gene to cadmium stress in Sedum alfredii Hance[J].Journal of Nanjing Forestry University (Natural Science Edition), 2019, 43(03): 59-66.DOI: 10.3969/j.issn.1000-2006.201810007.

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东南景天SaWRKY7基因对镉胁迫的响应研究

Research on the response of SaWRKY7 gene to cadmium stress in Sedum alfredii Hance

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[1]	缪李飞, 于晓晶, 张秋悦, 封超年. 4个杜梨半同胞家系苗期耐盐性分析[J]. 南京林业大学学报（自然科学版）, 2020, 44(5): 157-166.
[2]	张庆, 魏树和, 代惠萍, 贾根良. 硒对茶树镉毒害的缓解作用研究[J]. 南京林业大学学报（自然科学版）, 2020, 44(1): 200-204.
[3]	冯景, 沈永宝, 史锋厚. 银杏种子脱水敏感性的研究[J]. 南京林业大学学报（自然科学版）, 2019, 43(6): 193-200.
[4]	马迎莉,高雨,袁婷婷,代丽,张雨峰,谢寅峰. 重金属铬胁迫对髯毛箬竹光合特性的影响[J]. 南京林业大学学报（自然科学版）, 2019, 43(01): 54-60.
[5]	陈燕琼,沈,范佳露,陈茜,许欣玥,张迪,钱钢,陈颖. 茉莉酸甲酯对干旱及复水下落叶冬青苗叶片抗氧化水平的影响[J]. 南京林业大学学报（自然科学版）, 2018, 42(06): 35-43.
[6]	周余华,梁有旺,彭方仁. 低温胁迫下克恩氏冬青幼苗叶片差异蛋白质分析[J]. 南京林业大学学报（自然科学版）, 2017, 41(06): 187-192.
[7]	马迎莉,谷慧,张雨峰,代丽,李静,江方蕾,夏大娟,谢寅峰. 稀土铈对太子参生长和光合特性的影响[J]. 南京林业大学学报（自然科学版）, 2017, 41(04): 71-79.
[8]	何亚飞,张珊珊,孙鑫,王涛,代丽,谢寅峰. 高频度模拟酸雨胁迫条件下菲白竹的光合响应[J]. 南京林业大学学报（自然科学版）, 2016, 40(04): 49-55.
[9]	鲁路,张景波,陈金慧,周艳威,成铁龙. 比拉底白刺苗期抗旱性分析[J]. 南京林业大学学报（自然科学版）, 2015, 39(06): 51-55.
[10]	芮雯奕，田云录，张纪林，李淑琴. 干旱胁迫对6个树种叶片光合特性的影响[J]. 南京林业大学学报（自然科学版）, 2012, 36(01): 68-72.