While examining genotypic variation for photosynthetic capacity, Leidi et al. (1993)found a greater magnitude of genotypic variation for photosynthetic rate at boll formation stage in cotton germplasm.Considerable intra-specific variation for stomatal conductance in Gossypium hirsutum L. under water deficit has also been reported (Laffray and Louguet, 1990).From these studies, it is evident that leaf photosynthesis and stomatal conductance could be potential indicators for drought tolerance in cotton.