MATHEMATICAL APPROACHES FOR GROUPING TOPCROSS MAIZE HYBRIDS WITH PHK-42 AND DK-16/G2 PATERNAL LINES

Albena Pencheva

Abstract


A three-year study of 38 maize crosses obtained with the paternal lines PHK-42 and DK-16/G2 and the hybrids Kn-435, PR-9578 and Lg-3475 as a standards (checks) was carried out. Through cluster analysis, the test-crosses with paternal component PHK-42 were divided into two clusters-one larger and one smaller with differentiated 4 subgroups. The analysis shows that the grouping of samples is based on the average values of yield obtained in the relevant cluster. The impact of the yield and its elements, determined by applying the factor analysis, shows that of the possible 10 components, the analysis is presented to the second, explaining 77,0% of the total variation. DK-16/G2 crosses clustering results show that, depending on the relative distance between them, the test-crosses are also grouped into two clusters - one larger and one smaller. The distribution of the variants here is also based on the average yields obtained for the respective group. Crosses: A9E0371xDK-16/G2, 88BM29xDK-16/G2 and 88BM34xDK-16/G2 exceed the Kn-435 and Lg-3475 standards as well as all other variants. Using the factor analysis at crosses with DK-16/G2 paternal line, the variables are grouped into three components as they explains for 65,5% of the total variation.


Keywords


test-crosses, cluster analysis, basic components, average yield.

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