The mapping population was developed by crossing ‘Plainsman v.’ (♀), a us wheat variety well-known of its drought resistance and ‘Cappelle Desprez‘(♂), a French wheat variety sensitive to drought. The entire mapping population consisted of more than four hundred DH (doubled haploid) wheat lines. Due to the large population size, a necessary step was to refine the mapping population. according to the technical literature, the average size of a mapping population consists of 100–200 genotypes.
after collecting the phenotypic data, the most important goal was to create a reduced size of population for easier handling. The screening for plant height, heading time, grain yield and 1000-kernel weight has resulted in a mapping population of 137 DH lines by now. In our work, we try to ensure the normal distribution. We checked this by using the ‘three-sigma rule’, a statistical rule used for checking the normal distribution.
at present the limited mapping population is 137 DH line (including the parent genotype as well), which is an appropriate population size for the further phenotyping and genotyping work. The final goal of our experiments will be the understanding the genetic basis of drought tolerance. In this paper, the first part of our researches has been summarized.
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