Polyamine Accumulation in Transgenic Tomato Enhances the Tolerance to High Temperature Stress

作     者：Lin Cheng Yijing Zou Shuli Ding Jiajing Zhang Xiaolin Yu Jiashu Cao Gang Lu 

作者机构：Key Laboratory of Horticultural Plant Growth Development and Biotechnology Ministry of Agriculture Department of Horticulture Zhejiang University Hangzhou 310029 China 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2009年第51卷第5期

页      面：489-499页

核心收录：

学科分类：0710[理学-生物学] 09[农学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 090202[农学-蔬菜学] 

基　　金：Supported by the State Key Basic Research and Development Plan of China (2009CB119000) the National Natural Science Foundation of China(30571268) the Hi-Tech Research and Development Plan of China(G2006AA100108) 

主　　题：heat stress Lycopersicon esculentum polyamines Saccharomyces cerevisiae S-adenosylmethionine decarboxylase transformation. 

摘      要：Polyamines play an important role in plant response to abiotic stress. S-adenosyl-l-methionine decarboxylase （SAMDC） is one of the key regulatory enzymes in the biosynthesis of polyamines. In order to better understand the effect of regulation of polyamine biosynthesis on the tolerance of high-temperature stress in tomato, SAMDC cDNA isolated from Saccharomyces cerevisiae was introduced into tomato genome by means of Agrobacterium tumefaciens through leaf disc transformation. Transgene and expression was confirmed by Southern and Northern blot analyses, respectively. Transgenic plants expressing yeast SAMDC produced 1.7- to 2.4-fold higher levels of spermidine and spermine than wildtype plants under high temperature stress, and enhanced antioxidant enzyme activity and the protection of membrane lipid peroxidation was also observed. This subsequently improved the efficiency of CO2 assimilation and protected the plants from high temperature stress, which indicated that the transgenic tomato presented an enhanced tolerance to high temperature stress （38℃） compared with wild-type plants. Our results demonstrated clearly that increasing polyamine biosynthesis in plants may be a means of creating high temperature-tolerant germplasm.