Abstract
Heat stress is one of the production constraints for tomato (Solanum lycopersicum L.) due to unfavorable, above optimum temperatures. This research was undertaken to evaluate growth and fruit yield of tomato genotypes under three contrasting growing conditions (i.e., optimal temperature in field-, high temperature in field- and high temperature in greenhouse conditions) to determine their relative heat tolerance. Eleven tomato genotypes, including two local check varieties, were evaluated, and data on growth and yield were measured and analyzed. The interactions between the genotypes and growing conditions for all yield traits were significant. In general, the performance of tomato under optimal temperature field conditions was better than under high temperature field- and greenhouse conditions. Genotypes CLN1621L, CLN2026D, CLN3212C, and KK1 had consistently greater fruit yield per plant in all growing conditions. Although the local genotype, Neang Tamm, had lower yield under optimal conditions, it performed moderately well under high temperature field- and high temperature greenhouse conditions, and yield decrease under high temperature condition was minimal. Genotype CLN1621L had stable fruit setting compared to other genotypes under high temperature conditions. Since fruit setting and yield are important traits for heat tolerance, genotypes CLN1621L and Neang Tamm are potential candidates for breeding programs focused on improved yield and heat stress tolerance.
Highlights
Introduction published maps and institutional affilThe Solanaceae family consists of more than 3000 species [1], among which tomato (Solanum lycopersicum L.) is one of the most important vegetables in the world [2]
Similar trends for higher fruit yields per Kanwar [24]. These results were probably due to differences in other abiotic and biotic plant in the controlled environment relative to open field conditions were reported by factors rather than temperature in the field [6,7], as our results indicated that overall
These results were probably due to differences in other abiotic and biotic performance tended to be better in the greenhouse even while facing greater maximum factors rather than temperature in the field [6,7], as our results indicated that overall pertemperatures than the high temperature field conditions
Summary
Introduction published maps and institutional affilThe Solanaceae family consists of more than 3000 species [1], among which tomato (Solanum lycopersicum L.) is one of the most important vegetables in the world [2]. Asia [3], making tomato the most important vegetable crop in the region. Tomatoes have significant market potential and are considered a high value vegetable in Cambodia. Tomatoes in Cambodia’s markets are mostly imported from Vietnam [4]. This crop is grown in a wide range of climatic conditions from temperate to hot and humid tropics [5], its production is threatened and impacted by abiotic constraints, which limits productivity [6,7]. Type and occurrence of abiotic stresses often vary according to growing seasons. Among those abiotic stresses, heat stressis common and results in lower crop productivity
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