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Not AvailableA regular (cv. Thothapuri) and an irregular (cv. Langra) bearing cultivar of mango were selected to study the gas exchange parameters such as photosynthesis, stomatal conductance and internal carbon dioxide concentrations in flowering and non-flowering branches. Photosynthetic rates at different carbon dioxide concentrations were also recorded in both the branches to calculate the carboxylation efficiency by generating CO2 response curves. Photosynthetic rate and stomatal conductance were higher in non-flowering branches as compared to the flowering ones, in both cultivars. The reduction in photosynthetic rate was not due to variation in the water status of the leaves, since relative water content (RWC) of the leaves in both types of branches was not significantly different. Hence, the reduction in photosynthetic rate could be mainly due to the reduction in carboxylation efficiencyNot Availabl