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Cold tolerance in Osmotin transgenic tomato (Solanum lycopersicum L.) is associated with modulation in transcript abundance of stress responsive genes

Vikas Yadav Patade*, Deepti Khatri, Maya Kumari, Atul Grover, Sanjay Mohan Gupta and Zakwan Ahmed

Author Affiliations

Molecular Biology and Genetic Engineering Division, Defence Institute of Bio-Energy Research, Haldwani 263 139, Uttarakhand, INDIA

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SpringerPlus 2013, 2:117  doi:10.1186/2193-1801-2-117

Published: 19 March 2013

Abstract

Our containment trials have established cold tolerance in Nicotiana tabacum osmotin (Nt Osm) transgenic tomato (Solanum lycopersicum L. cv. Pusa Ruby). Though, the stress tolerance mechanisms have been studied at physio-biochemical levels, molecular mechanisms underlying the tolerant response are still not well studied. Therefore, quantitative transcript expression of Osmotin and other stress responsive genes (CBF1, P5CS and APX) was studied in response to cold (4°C; 2 and 24 h) treatment in the transgenic and wild type tomato plants. The expression analysis revealed differential transcript regulation in the transgenic and wild type plants on the cold exposure. In general, the genes were either earlier induced or the extent of fold change in transcript expression over the respective untreated controls was higher in transgenic than in the wild type plants on cold exposure. The transcript expression data also supported the metabolite analysis on free Proline and ascorbate content. The results thus suggest that constitutive over expression of the Osmotin modulate transcript abundance and functional expression products of the other stress responsive genes thereby, imparting cold tolerance in the transgenic tomato plants.

Keywords:
Osmotin; Transgenic tomato; qRT PCR; Transcript expression; Free Proline; Ascorbate; Cold stress