Structural changes of the photosynthetic apparatus; morphological and cultivation responses in different wheat genotypes under drought stress condition
Year: 2008
Type: article
Abstract: To understand genotypic responses of wheat genotypes to drought stress, this project studied 64 different wheat genotypes under both irrigated and drought stress conditions, using simple lattice experimental design with two replication in research area of agricultural research station of Ardabil and research area and laboratory of genetic resources institute of Azerbaijan during two seasons 2006 to 2007.Drought reduced wheat grain yield by 61.9% and stress intensity (SI) for wheat grain yield was 0.62.The genotypes studied were classified into three groups; tolerant, moderate tolerance and susceptible by genotypic responses of wheat genotypes under both irrigated and drought stress conditions and on the basis of values of SSI and STI indices.Results of germination capability of wheat genotypes evaluated under 16 atmosphere drought stress of PEG and control (water) treatments showed the same results as field experiments on the basis of the classifications of wheat genotypes for three classes; tolerant, moderate tolerance and susceptible.Results of changes of amounts of chlorophyll also showed significantly differences (p<0.1) between genotypes examined basis of amount of chl a, chl b, chl a+b and chl a/b under 20 atmosphere drought stress of PEG and control (water) treatments.Drought on average reduced amount of chl a, chl b and chl a+b, by 2.5, 6.6 and 2.5% respectively.However the amounts of reduction in chl a, chl b and chl a+b were different between genotypes studied, so that the amounts of chl a, chl b and chl a+b were increased in drought tolerant wheat genotypes.According to the depression degrees of chl a+b the classifications of wheat genotypes were also the same as the classifications of field experiments and germination capability under 16 atmosphere drought stress of PEG and control (water) treatments.The amount of chlorophyll was positively correlated (r =0.36**) with grain yield and with leaf area index (r =0.15ns) of wheat genotypes.Drought reduced genotypic variation and heritability of wheat genotypes in most of examined characters.However heritability of grain yield and leaf area index was increased in drought stress condition.Finally according the studied characters the genotypes No. 6, 30, 37, 42, 43 and 44 were found to be tolerant genotypes.
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W846351127