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Among abiotic stresses, high temperature is an obstructive factor in plant growth and physiological activities for sustainable agriculture, worldwide. Chitosan is a bio-based stimulant and may be helpful in reducing adversative effects of temperature stress. A field experiment was conducted to investigate the role of chitosan as high temperature stress regulator in two eggplant genotypes (Black boy and Sandhya) under arid environment. Temperature stress was maintained by delayed planting of eggplant as compared to its optimum planting time. Results showed that foliar application of chitosan has significantly improved the eggplant growth and yield characteristics. The effect of chitosan was more prominent on the genotype Black boy over Sandhya and recovery of plants improved with the increase in its application rate. The maximum yield was obtained in Black boy that was 42% higher to control and 14% to Sandhya at chitosan application of 175 mg L-1. Application of chitosan also improved the proline content, glycinebetain, total soluble solids and total phenolics accumulation. The late season high temperature stress significantly reduced the linear electron flow and non-photochemical quenching but the application of chitosan significantly improved both these characters. The positive effect of chitosan on plant physiochemical traits was more promising on genotype Black boy over Sandhya. These findings showed that the chitosan can be used as an ecofriendly compound to enhance plants activities under stress conditions.