Morpho-physiological evaluation of tomato genotypes under high temperature stress conditions
Journal of the Science of Food and Agriculture, ISSN: 1097-0010, Vol: 96, Issue: 8, Page: 2698-2704
2016
- 53Citations
- 77Captures
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Metrics Details
- Citations53
- Citation Indexes53
- 53
- CrossRef16
- Captures77
- Readers77
- 77
Article Description
BACKGROUND: Tomato (Solanum lycopersicum L.) is an important but heat-sensitive vegetable crop. The losses in tomato production associated with heat stress are aggravating further under a global warming scenario. The present study was designed to investigate the comparative performance of tomato genotypes under high temperature stress. Tomato genotypes (191) were exposed to the controlled conditions of high temperature (40/32°Cday/night temperature). Different morphological (shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight and number of leaves), physiological (photosynthetic rate, transpiration rate, water use efficiency, stomatal conductance to water, sub-stomatal CO and leaf temperature) and SPAD value (chlorophyll content) were recorded to check the diversity among genotypes against heat stress. RESULTS: All the genotypes showed a significantly variable response in almost all the attributes under high-temperature conditions. Correlation among the variables provided a clear understanding of the phenomena involved. Based on all the attributes studied, genotypes L00090 and L00091 were found to be the most heat tolerant compared to other genotypes, whereas CLN1462A and CLN 1466E were found to be comparatively sensitive. CONCLUSION: It was concluded that the studied attributes were genotype dependent, and significant diverse performance was noted. The findings of this study pave the way towards the selection of tolerant genotypes, not only for use under high-temperature conditions but also to employ them in breeding programs to produce heat-tolerant hybrids.
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