Selection of bread wheat genotypes against heat and drought tolerance based on chlorophyll content and stem reserves
2009
Mohammadi, M. (Dryland Agricultural Research Inst. (Iran)) | Karimizadeh, R.A. (Dryland Agricultural Research Inst. (Iran)) | Naghavi, M.R. (Tehran Univ., Karaj (Iran). Agronomy and Plant Breeding Dept.)
In order to compare some bread wheat cultivars against heat and drought tolerance stresses, two different experiments were done at Gachsaran Agricultural Research Station during, 2006-2007. In the first experiment, chlorophyll content was measured for 18 genotypes and in the second experiment, 5 genotypes desiccated with iodide potassium 0.4% at 10 days after anthesis. Both experiments laid out in complete randomized block design with 4 replications. Significant correlation between chlorophyll content and grain yield under heat and drought stresses can contribute to decrease of drought intensity damage due to reduction of chlorophyll content through light absorption. Stem reserves was obtained by comparing mean kernel weight under desiccation with mean kernel weight in the controls, for each tested genotype. Stem reserves, based on "Percent reduction in kernel weight" was from 15 to 36% in five cultivars. Meanwhile, there was high correlation between stem reserves with grain yield and plant height under dryland conditions. Hence, stem reserves is an important source of carbon for grain filling.
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