Described herein is a process of genetic transformation in W. somnifera by Agrobacterium tumefaciens mediated transformation to overexpress squalene synthase gene (WsSQS) encoding WsSQS enzyme that catalyzes the synthesis of squalene from farnesyl pyrophosphate. Increased withanolide level including withaferin-A, withanolide A and B and withanone is attained in transformed plant tissues.

The invention provides methods for identifying regenerated transformed plants and differentiated transformed plant parts, obtained without subjecting plant cells to selective conditions prior to regenerating the cells to obtain differentiated tissues. In particular embodiments, the plant cells are corn plant cells. Methods for growing and handling plants, including identifying plants that demonstrate specific traits of interest are also provided.