This document discusses various methods for germline transformation in plants. It begins with introducing germline transformation as the process of altering an organism's genetic makeup by inserting new DNA into its genome, usually using vectors like plasmids. It then describes several methods for accomplishing plant transformation, including the pollen tube pathway method, Agrobacterium-mediated method, electrofusion, floral dip method, and biolistic method. The document provides details on the history and protocol of the pollen tube pathway method for plant transformation.