J Integr Plant Biol. ›› 2009, Vol. 51 ›› Issue (5): 489-499.DOI: 10.1111/j.1744-7909.2009.00816.x

Special Issue: Abiotic Stresses

• Plant-environmental Interactions • Previous Articles     Next Articles

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

Lin Cheng, Yijing Zou, Shuli Ding, Jiajing Zhang, Xiaolin Yu, Jiashu Cao and Gang Lu*   

  1. Key Laboratory of Horticultural Plant Growth, Development and Biotechnology, Ministry of Agriculture, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
  • Received:2008-06-21 Accepted:2008-12-28 Published:2009-02-27
  • About author: *Author for correspondence. Tel: +86 571 8697 1349; Fax: +86 571 8697 1188; E-mail: glu@zju.edu.cn

Abstract:

Polyamines play an important role in plant response to abiotic stress. S-adenosyl-l-methionine decarboxylase (SAMDC ) one of the key regulatory enzymes in the biosynthesis of polyamines. In order to better understand the effect of gulation of polyamine biosynthesis on the tolerance of high-temperature stress in tomato, SAMDC cDNA isolated from accharomyces 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 ◦C) 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.

Cheng L, Zou Y, Ding S, Zhang J, Yu X, Cao J, Lu G (2009). Polyamine accumulation in transgenic tomato enhances the tolerance to high temperature stress. J. Integr. Plant Biol. 51(5), 489-499.

Key words: heat stress, Lycopersicon esculentum, polyamines, Saccharomyces cerevisiae, S-adenosylmethionine decarboxylase, transformation.

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