Expression of the glutathione S-transferase gene (NT107) in transgenic Dianthus superbus

Author： Lim Jung   Hahn Sang   Yu Chang   Chung Ill  

Publisher： Springer Publishing Company

ISSN： 0167-6857

Source： Plant Cell, Tissue and Organ Culture, Vol.80, Iss.3, 2005-03, pp. : 277-286

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Using an Agrobacterium-mediated transformation method based on wounding cultured immature seeds with carborundum (600 mesh) in liquid, auxin-regulated tobacco glutathione S -transferase (GST) (NT107) constructs were used to transform Dianthus superbusL. A 663 bp DNA band was found in the transgenic plant genome by PCR analysis using NT107-1 and NT107-2 primers, and a Southern blot analysis showed that the DIG-labelled GST gene was hybridized to the expected amplified genomic DNA fragment from transgenic D. superbus. An overexpression of NT107 led to a twofold increase in GST-specific activity compared to the non-transgenic control plants, and the GST overexpression plants showed an enhanced acclimatization in the soil. To investigate whether an increased expression of GST could affect the resistance of photosynthesis to environmental stress, these plants were subjected to drought and various light intensities from 100 to 3000 μmol m−2s−1. Copper accumulation and the translocation rate were also analysed in the transgenic lines, and the GST overexpression plants were found to synthesize phytochelatin (PC), which functions by sequestering and detoxifying excess copper ions.

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