Evaluation of Heat Tolerance Potential of OKRA Genotypes in Field Conditions at Different Sowing Dates.
Experiment was conducted with the aim to screen out okra genotypes for heat stress tolerance potential at different sowing dates in field conditions. Experiment was conducted at vegetable research area, Institute of Horticultural Sciences, University of Agriculture, Faisalabad, Punjab, Pakistan in summer season of 2014. For this purpose 25 okra genotypes screened out from 100 genotypes (imported from AVRDC, Taiwan, China.) against heat stress under controlled environmental conditions were sown in field conditions at different sowing dates to check the effect of heat stress under field environment. Three sowing dates were 02 April, 12 April, and 22 April. Data for morphological parameters (number of plant survived, number of leaves per plant, plant height (cm), pod length (cm), number of pods per plant, pod diameter (cm) and leaf area (cm2)) and physiological parameters (photosynthetic rate, transpiration rate, sub-stomatal CO2, leaf temperature, water use efficiency, sub-stomatal conductance to water, electrolyte leakage and chlorophyll contents) was recorded. All cultural practices were kept same for all sowing dates and for all genotypes. Experiment was replicated four times and there were five plants per replication. Randomized Complete Block Design (RCBD) with two factor factorial arrangements was applied to experiment. Collected data was analyzed statistically by employing the Fisher's analysis of variance technique and significance of treatments was tested by using HSD (Tukey Test). Results for morphological, physiological and yield attributes showed that VI051062 and VI060131were found most heat tolerant, while VI046554 and VI048594 were found most heat sensitive genotypes for heat tolerance under field conditions.
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