Indole acetonitrile-sensitivity of transgenic tobacco containing Arabidopsis thaliana nitrilase genes

被引:8
作者
Dohmoto, M [1 ]
Sano, J [1 ]
Isaji, G [1 ]
Yamaguchi, K [1 ]
机构
[1] Kanazawa Univ, Inst Gene Res, Kanazawa, Ishikawa 9200934, Japan
关键词
transgenic tobacco; Arabidopsis thaliana; nitrilase; NIT genes; indole-3-acetic acid;
D O I
10.1007/s002990000218
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The Arabidopsis thaliana genome has four nitrilase (nitrile aminohydrolase, EC 3.5.5.1) genes (NIT1 to NIT4). These nitrilases catalyze hydrolysis of indole-3-acetonitrile (IAN) to indole-3-acetic acid (IAA). Growth of A. thaliana is inhibited by IAN probably due to hydrolysis of IAN to IAA, while the tobacco (Nicotiana tabacum) genome has only NIT4 homologs and is resistant-to IAN. In this study, we introduced A. thaliana NIT1 to NIT4 into tobacco. Introduction of NIT1, NIT2 or NIT3 into tobacco conferred growth inhibition by IAN. NIT2 transgenic plants were highly sensitive to IAN, and NIT1 and NIT3 transgenic plants were moderately sensitive. On the other hand, NIT4 transgenic plants were less sensitive to IAN, although some morphological changes in the roots were observed as the wild-type tobacco. These findings suggest that the ability of transgenic tobacco to convert IAN to IAA in vivo is markedly different among transgenes of NIT1 to NIT4.
引用
收藏
页码:1027 / 1032
页数:6
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