PJB-2019-678
Comparative physiological assessment of some edible oil-seed crops under drought stress environment using fluorescence and IR imaging techniques
Fiza Ali, Muhammad Umar and Zamin Shaheed Siddiqui
Abstract
Comparative physiological assessment of some edible oilseed crops under drought stress environments were performed. In this regard, fluorescence and IR thermal imaging techniques were used. Seeds of each sunflower SF0049, SF0054 and soybean NARC-II, William-82 cultivars were germinated. Followed by uniform seedlings of each cultivar were transplanted in rectangular pots of an area 480cm2. Three weeks old plants were subjected to drought stress for the next five days. Chlorophyll ‘a’ fluorescence, IR images, relative water content (RWC) and stomatal conductance (gs) were recorded. In drought stress, NARC II and William-82 showed 26-31% reduction in RWC as compared to 18-20% reduction in SF0049 and SF0054. Similarly, 67- 87% reduction in stomatal conductance was observed in soybean and 59-72% were recorded in sunflower cultivars. Further soybean cultivars displayed 44.4% to 85.7% decrease in performance index (PI) and dark-adapted quantum yield (Fv/Fm) as compared to 40% to 87% in sunflower cultivars. Maximum yield of photochemistry of PSII and chlorophyll content index were also reduced up to 28-68% in all tested cultivars under drought stress. Non-photochemical quenching, heat dissipation, and leaf temperature were increased over control under drought stress showing maximum in soybean as compared to sunflower. The importance of comparative physiological assessment using fluorescence and IR thermal imaging techniques are discussed.
To Cite this article:
Ali, F., M. Umar and Z.S. Siddiqui. 2021. Comparative physiological assessment of some edible oil-seed crops under drought stress environment using fluorescence and IR imaging techniques. Pak. J. Bot., 53(4): DOI: http://dx.doi.org/10.30848/PJB2021-4(13)
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