The present experiment on "Biochemical and Molecular Characterization of Cotton (Gossypium hirsutum L.) Genotypes for Drought Tolerance" was conducted at Department of Biochemistry, Main Cotton Research Station, Navsari Agricultural University, Surat. Twelve genotypes were selected for screening in experiment-1. Seeds were grown in pots filled with sand culture for 15 days. The seedling were subjected to control and 10 % PEG-6000 treatment for 48 hour and samples were analyzed for relative water content, membrane stability index, proline, chlorophyll stability index and molecular diversity...