Understanding the impact of drought stress in tomato (Lycopersicon esculentum L.) genotypes is essential under such global climate change situations which will facilitate drought tolerance potential information and crop improvement in future. The study assessed the morpho-physiological variability of four tomato genotypes in response to drought stress. Drought treatment caused an average reduction to about 45% in plant height in all genotypes. Similarly there was a rapid decrease in the root length under stress, which can be considered as negative aspect towards tolerance. Apart from this, there was also a drastic reduction seen in the leaf number and leaf area, which indirectly indicate the decline in growth attributes. The water stress of the crop under depleting soil moisture status resulted in declined RLWC to about 25% in the entire maximum reduced RLWC (about two fold) under drought stress. Drought stress altered the concentration of Chlorophylls, Carotenoids and Xanthophylls which in turn altered the CSI. Correlating MSI with these parameters, variety ML which showed better adaptation also proved to be less injured under stress with a minimal injury index. Additional to this membrane injury, the lipid Peroxidation also proved the damage levels under stress, where MP showed highest (0.62) Peroxidation, where MR recorded the lowest (0.46). Hence the response to drought stress in genotypes involved some modifications in morphology, physiology, and growth.
B Sajitha, S Menaga, S M Dhivya. Drought induced morpho physiological responses in tomato Lycopersicon esculentum (L.) genotypes. International Journal of Botany Studies, Volume 7, Issue 4, 2022, Pages 88-96