Expression of a Grape -Increased Resistance to Powdery Mildew and Osmotic Stress in Arabidopsis but Enhanced Susceptibility to in Arabidopsis and Tomato.

Stilbene synthase genes make a contribution to improving the tolerances of biotic and abiotic stress in plants. However, the mechanisms mediated by these genes remain unclear. To provide insight into the role of genes defense against biotic and abiotic stress, we overexpressed in and tomato (Micro-Tom) via -mediated transformation. -transformed Arabidopsis lines displayed an increased resistance to powdery mildew, but both -transformed Arabidopsis and tomato lines showed the increased susceptibility to . Besides, transgenic Arabidopsis lines were found to confer tolerance to salt and drought stress in seed and seedlings. When transgenic plants were treated with a different stress, qPCR assays of defense-related genes in transgenic Arabidopsis and tomato suggested that played a specific role in different phytohormone-related pathways, including salicylic acid, jasmonic acid, and abscisic acid signaling pathways. All of these results provided a better understanding of the mechanism behind the role of in biotic and abiotic stress.