Overexpression of the wheat trehalose 6-phosphate synthase 11 gene enhances cold tolerance in Arabidopsis thaliana.

Low temperature is a key stress factor for the growth and development of wheat (Triticum aestivum L.), and glycometabolism plays an important role in plant cold tolerance. Our previous study identified trehalose 6-phosphate synthase 11 gene (TaTPS11), which had a significantly different expression pattern between a high freezing-tolerant wheat cultivar and a low freezing-tolerant wheat cultivar. In this study, TaTPS11 was isolated from a winter-hardy wheat cultivar (D1) and overexpressed in Arabidopsis thaliana to study its effect on cold tolerance in plants. Transgenic plants expressing TaTPS11 had lower sucrose content, higher starch content, and higher activity of key enzyme (sucrose phosphate synthase, sucrose synthase, and invertase) involved in sucrose metabolism. In addition, the expression level of sucrose non-fermenting 1-related kinase 1 (SnRK1), which catalyzes the sucrose in plants, increased in the TaTPS11-overexpressed plants. These results indicated that heterologous expression of TaTPS11 influenced carbohydrate metabolism in Arabidopsis plants. The resultant plants had a significantly higher survival rate after -5 °C treatment for 2 h and exhibited enhanced cold tolerance without unfavorable phenotypes compared to wild-type. Our findings indicated that manipulation of TaTPS11 improved cold tolerance in plants and TaTPS11 had potential values in wheat cold-tolerance breeding.