Salicylic acid improved the heat tolerance by enhancing growth, gas exchange attributes and chlorophyll contents of tomato
2019
Shaheen, M. R. | Ayyub, C. M. | Hussain, R. | Manan, A. | Mustafa, Z. | Sarwar, M. | Ahsan, M. | Sarwar, N. | Imran, M.
Heat stress is one of the major issues that are curtailing yield and productivity of the crops. This situation is to aggravate further under the global warming scenario. Keeping in consideration the prevailing problem, the present study was designed to investigate the role of exogenously applied salicylic acid in enhancing heat tolerance of tomato. Tomato genotypes (two heat tolerant and two heat sensitive) were exposed to controlled conditions of high temperature (40/32°C day and night) and were sprayed with salicylic acid at various concentrations. The data regarding growth related attributes, gas exchange related attributes and chlorophyll contents were recorded and analyzed statistically. The study proved that exogenously applied salicylic acid induced heat tolerance in tomato genotypes as enhanced tolerance was noted as compared to control. The results revealed that the foliar application of salicylic acid with a concentration of 1.5 mM was found appropriate in alleviating the drastic effects of high temperature as compared to other concentrations tested. It can be concluded that heat tolerance potential of the tomato can be enhanced by applying salicylic acid exogenously. The findings of this study will not only help in boosting yield but will also expand the growing period of tomato in the summer months.
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