Overexpression of Arabidopsis tryptophan synthase beta 1 (AtTSB1) in Arabidopsis and tomato confers tolerance to cadmium stress.

 Overexpression of <i>Arabidopsis tryptophan synthase beta</i> 1 (<i>AtTSB</i>1) in <i>Arabidopsis</i> and tomato confers tolerance to cadmium stress.相片
鎘(Cd)對植物的毒害作用已清非常確定。色胺酸(tryptophan) 是一種人體所需的必須胺基酸,在植物的生長發育與防禦機制的調控中則扮演重要的角色。然而,色胺酸與鎘抗性的關係目前尚未被釐清。本篇文章描述色胺酸在轉殖阿拉伯芥與番茄中抗鎘的分子機制。實驗結果顯示增加阿拉伯芥的色胺酸基因(AtTSB1)的表現量可提高轉殖植物抗鎘能力但不會增加植物鎘吸收的含量。有趣的是,轉殖植株提高體內色胺酸的含量可影響AtZIP4 與 AtZIP9等金屬轉運子的表現量,進而干擾鎘離子的運輸。

Sanjaya, Hsiao, P., Su, R. C., Ko, S. S., Tong, C. G., Yang, R. Y., Chan, M. T.* (2008) Overexpression of Arabidopsis tryptophan synthase beta 1 (AtTSB1) in Arabidopsis and tomato confers tolerance to cadmium stress. Plant, Cell and Environment, 31: 1074-1085