Abstract
Present investigation was focused on the response and regulation of the antioxidant defense system and photosynthetic pigment variation effect of two important fungicides or plant growth regulators Hexaconazole (HEX) and Tebuconazole (TBZ) on drought stressed tomato (Lycopersicon esculentum Mill.) plants. Drought stress was imposed for 30 Days after sowing (DAS) of tomato plant. The water was irrigated by 4 Days Interval Drought (DID) and the control plants were regularly irrigated. Triazole treatment like HEX at 15 mg L-1 and TBZ at 10 mg L-1 imposed on 30, 40 and 50 DAS. The plant samples were collected on 40, 50 and 60 DAS. The photosynthetic pigments like chlorophyll – a, chlorophyll – b and total chlorophyll were estimated. The drought stress reduced the photosynthetic pigments and increased the antioxidant contents and antioxidant enzymes activities. The combined drought stress with triazole treatments increased the photosynthetic pigments then reduced the ascorbic acid (AA), α-tocopherol, catalase (CAT), peroxidase (POX) and superoxide dismutase (SOD) activities, when compared to drought stressed plants. It can be concluded that the triazole treatment partially mitigated the adverse effects of drought stress in L. esculentum.
Highlights
Tomato (Lycopersicon esculentum Mill) is an important, popular and nutritious vegetable grown all over the world in outdoor fields, greenhouses and net houses (Sharma et al, 2017)
Drought with triazole treatments to increase the photosynthetic pigments when compared to drought stressed plants and it was 80.03, 83.14 and 81.58 in TBZ treated plants 90.08, 92.05 and 91.23 percent over control in chl-a, chl-b and total chlorophyll content respectively at 60 Days after sowing (DAS) plants (Table 1)
Effect of Triazole treatments on Ascorbic acid content of Tomato under drought condition Drought stress caused an increase in the ascorbic acid content and it was 147.22, 147.83 and 137.64 percent over control on root, stem and leaves on 60 DAS plants respectively
Summary
Tomato (Lycopersicon esculentum Mill) is an important, popular and nutritious vegetable grown all over the world in outdoor fields, greenhouses and net houses (Sharma et al, 2017). They contribute to a healthy, wellbalanced diet in rich minerals, vitamins, essential amino acids, sugars and dietary fibres, iron and phosphorus. Drought is a major abiotic stress for tomato but for almost all the agricultural crops around the world (Yordanov et al, 2003). Zhou et al (2017) recently reported effect of drought in producing over heat stress on three tomato varieties Drought is a major abiotic stress for tomato but for almost all the agricultural crops around the world (Yordanov et al, 2003). Zhou et al (2017) recently reported effect of drought in producing over heat stress on three tomato varieties
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