SELECTING PARENT PAIRS IN PEAR BREEDING BY THE CRITERION “EUCLIDEAN DISTANCES”
- The authors:
- Kiseleva N. S.
- Page numbers:
- 91 - 97
- pear, cultivar, genotype, breeding, complex of signs, “Euclidean distances”, breeding effect.
In fruit crops breeding crossing combinations are usually estimated on the basis of data about their posterity, therefore the problem of selecting parental pairs under initial forms is rather actual. The given work realized two following principles in selecting parent pairs by statistical methods: a choice of one parent form on a complex of the expressed valuable signs; parent forms are selected according to an assessment of their genotypic remoteness from each other. In our case, the assessment was carried out with the help of “Euclidean distances” (from 1 to 1.9) on a 9 ball scale of signs coding used in order to estimate the distinguishability, uniformity and stability, and the degree of their expressiveness. The breeding effect of the studied crossing combinations is defined as the relation of the number of productive pairs to the number of parent pairs tested by selectors. The great values of “Euclidean distances”, calculated for different parent pairs by a complex of signs, correspond to a high probability to receive a new cultivar. Thus, when selecting by a complex of signs, “Euclidean distances” can be the criterion to estimate the selection of parent pairs.