Page 144 - Zbornik_Konf_2019

https://doi.org/10.15414/2019.9788055220703

4 International Scientific Conference Abstracts Book
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EFFECT OF WATER STRESS ON PHYSIOLOGICAL AND GENETIC PARAMETERS AT
ANTHESIS STAGE IN WINTER WHEAT GENOTYPES DIFFERING BY MATURITY
Tamraz Tamrazov

Research Institute of Crop Husbandry, Ministry of Agriculture, Baku, Azerbaijan;
E-mail.: tamraz.tamrazov@mail.ru
The effectiveness of the research is that the study of the dynamics of changes in
physiological and genetic parameters of wheat genotypes, differing from the drought effects of
the soil according to the soil climate of the country, and its role in productivity. The aim of
the research is to teach the dynamics of morphophysiology and genetic variation of the durum
and bread wheat genotypes, which are introduced from international breeding centers and
adapted to local conditions, and also to give specific recommendations on the selection of
wheat genotypes in different soil and climatic conditions.
The objects under studying in the 2017–2018 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. During the research, genotypes were
determined by the speed of photosynthesis (Fi), transpiration speed (Ti), carbon dioxide
(CO2g) in intercellular areas, and the American-made LI-6400 in upper layer leaves. The main
results were as followed: developmental stages influenced wheat photosynthesis greatly and
tiller stage played more roles; there is significant difference in the main photosynthetic
parameters, photosynthesis rates (Photo), stomata conductance (Cond) and transpiration
rates (Trans), general photosynthesis and drought resistance in different wheat genotypes
was related much to their domesticated origin soil-water environment and selected
generations and there was a photosynthetic threshold effect in terms of different wheat
genotypes at soil water deficits.
From the early maturing wheat genotypes Garakılchık-2 durum wheat genotype, both in
the two versions, separately on the 8 and 7 layer leaves, Fi-14,2, 16.9/8.3-13.5 (mmol CO2
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m-2s-1), CO2g 342; 365/355; 376 (mmol CO2 moll / 2) and finally Ti-value 3.9; 6.7/2.8; 4.2
(mol H2O m-2s-1), bread wheat genotypes of Nurlu-99 type Fi-13,5; 11.6/10.2; 12.4 (mmol
CO2 m-2s-1), CO2q-328; 345/356; 388 mmol of CO2 moll / 2 and finally Ti-4.2; 7.1/3.9; 5.4
(mol H2O m-2s-1 ). At the flowering phase Fi-19,6; 17.4/21.9; 18.7 (mmol CO2 m-2s-1), Ti-9,2;
7.4/6.3; 8.2 (mol H2O m-2s-1 ), compared to the previous measurements, the difference between
the variants was significantly lower compared to those observed in the third measure.
From here, it can be concluded that there is a difference between durum and bread
wheat genotypes, compared to the other varieties within the group. This is due to the fact that
early maturing genotypes complete their development before the severe drought occurs,
which leads to a small difference in variants. This in turn ultimately leads to yield loss. In the
future, it is important to pay attention to the fact that such genotypes should be taken as
parental forms for the creation of new varieties.
According to the obtained results, for the all assimilating organs of the early maturing
genotypes, the earing phase is considered to be the most favorable. Thus, the most active
metabolism occurs during the mentioned growth phase of the plant.

Keywords: water stress, wheat genotypes, physiological and genetic parameters, drought resistance.

|144 4 International Scientific Conference Agrobiodiversity Nutrition, Health and Quality of Human and Bees Life
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September 11–13, 2019