GENOTYPIC DIFFERENCES IN SOME PHYSIOLOGICAL PARAMETERS UNDER MODERATE DROUGHT STRESS IN TOMATO

Abstract

A pot experiment was conducted in the net house of the Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka- 1207, during the months of November 2018 to March 2019 observed the Genotypic differences of ten tomato genotypes under three different drought treatments. Two factorial experiment including ten tomato genotypes viz. G iv

1 (local variety), G 2 (BARI Tomato 16), G

(BARI Tomato 3), G 4 (BARI Tomato 15), G 5 (BARI Tomato 2),G (BARI Tomato 18), G 7 (BARI Tomato 19), G 8 (BARI Tomato 14), G 9 6 (BARI Tomato 11), G

(ROMA VF), and three drought treatments, T 1 (Control), T (15 days withholding of water) and T 3 2 (35 days withholding of water) were outlined in completely randomized design (CRD) with three replications. The results showed that both the tomato genotypes and drought treatments had significant influence independently and dependently on agromorphogenic, physiological, antioxidant and nutritional traits of tomato plant. Almost all traits responded negatively as the drought level increased except days to first flowering, maturity, proline and brix (%). Regarding yield performance G 8 showed tolerance at moderate drought stress and G at severe drought stress. Regarding antioxidant and nutritional traits, G 5 for brix (%), G 9

,G 10 for Vitamin-C content and G for lycopene content showed tolerance at moderate drought stress period and G 10 3 2 , G 3 ,G for prolonged and severe drought stress. These genotypes could be recommended to the farmers for cultivation in the drought prone areas of Bangladesh and also could be used in future hybridization or other gene transfer programmes.