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Not AvailableThe increases in daily mean temperature can have negative impact on different agricultural crops. Tomato being one of the important horticultural crops in India is sensitive to temperature elevations. Although extreme temperature episodes lead t o severe effects, even the mild temperature elevation, which is just above the optimal threshold, can considerably alter crop growth and development. However, no mechanistic studies have been conducted to understand the growth, reproductive development and yield response of popular tomato genotypes under mild temperature elevation (MTE). Hence, the effect of MTE on four selected tomato genotypes ( Solanum lycopersicum L.) was examined in temperature gradient tunnel (TGT). The MTE led to reduction in in vitro pollen germination, number of fruits, fruit set per centage, fruit weight, number of leaves, number of branches, plant height, total dry matter accumulation and harvest index. Concurrently, number of trusses, number of flowers and flower abortion were incr eased. The results imply that, even the mild MTE can adversely affect the growth, development and yield of tomato. Based on the maintenance of harvest index and fruit weight per plant under MET, cv. Arka Vikas and advanced breeding line IIHR 2195 are found to be potential candidates with diverse genetic capability to include in breeding programs for developing temperature tolerant cultivars for future climatic conditions.ICAR-NICR

Response of tomato (Lycopersicon esculentum Mill.) genotypes to elevated temperature

Not AvailableGlobal warming is an important issue threatening agriculture and allied sectors with serious consequences on food production. Tomato being sensitive to temperature would be influenced by elevated temperatures under climate change scenarios. Physiological response of five tomato genotypes, Arka Vikas, Arka Saurabh, Abhinava, RF4A and 2195 to mild elevated temperatures at peak flowering and peak fruiting stages was evaluated in temperature gradient tunnel (TGT) facility. The increase in temperature above the optimal, caused reductions in net photosynthesis rate, transpiration and stomatal conductance with differences in response among the five genotypes. The reductions were large at peak flowering stage compared to peak fruiting stage. The Photochemical efficiency of PSII was also reduced at both peak flowering and fruiting stages due to increase in temperature. At peak fruiting stage, due to increase in temperature, leaf epicuticular wax content increased across the genotypes and higher total soluble sugars, reducing sugars and proline content contributed to increase in leaf osmotic potential. Overall, better performance of germplasm line 2195 and cv. Arka Vikas was observed under elevated temperature.ICAR under NICRA projec