PJB-2020-136
ASSESSMENT OF THE EFFECTS OF DROUGHT ON SOME MORPHOPHYSIOLOGICAL FEATURES AND PRODUCTIVITY OF DIFFERENT WHEAT GENOTYPES, DEPENDING ON THE RIPENING PERIOD
Tamraz Tamrazov
Abstract
Drought stress during the grain filling period has recently become more common in Azerbaijan, where wheat (Triticum aestivum L., Triticum durum desf.). Particular attention should be paid to physiological studies to increase resistance to drought and other stress factors of the wheat genotypes and identify sustainability mechanisms, on the other hand, to determine the physiological and genetic changes occurring in genotypes. The study of the effects of drought resistance on fertility measurements and the effect of fertility indicators on typical wheat investigated based on different soil and climatic conditions. In the 2018-2019 academic year,12 different wheat genotypes were measured in the Absheron Experimental Base of the Institute in three groups (early, medium and late maturing). As a result, two genotypes from each group were compared, including durum and bread wheat. The net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate per leaf area (E), leaf temperature (Tl) and intercellular CO2 concentration(Ci) were measured using a portable photosynthesis system LI-6400 (LI-COR, USA) on the flag leaves on midday (09:00-12:00) at after anthesis. Photosynthetically- active radiation (PAR) of 1,200-1,600 µmol (photon) m-2 s-1 was provided at each measurement by the ambient CO2 concentration of 380-400 ppm and full sunlight. Photosynthetic water use efficiency (PWUE) was calculated by dividing Pn to gs During the study, we analyzed changes in gas metabolism and some physiological features of different wheat genotypes responding to drought stress. Such research will provide valuable information that can be used as a genetic basis for wheat production to increase productivity and productivity from stress.
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