Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 1
Written by Neli KERANOVA, Marina DRUMEVA-YONCHEVA, Yonko YONCHEV
Agro-morphological traits of five Virginia tobacco hybrid combinations and standard Virginia 0514 were analyzed. The aim of the study was to group and evaluate hybrid combinations by stem height (SH), leaf number (LN), length of 12th leaf (LL), width of the 12th leaf (WL), days to 50% flowering (D50F), dry leaf yield. Hierarchical cluster analysis and analysis of the main components were applied. The grouping of hybrids in clusters found that Hybrid 27, Hybrid 33 and Hybrid 126 with a common parent component Virginia 385 have larger leave size and higher dry leaf yield, which determines not only their differentiation into a separate cluster, but also their strong distance from the other two hybrids and the Virginia 0514 standard. The Hybrid 126 has the longest growing season. The studied traits were transformed into two factors. The first includes length of 12th leaf and width of the 12th leaf, days to 50% flowering and dry leaf yield and explains 42.8% of the total variance. The second main component consists of plant height and leaf number, explains 32.5%. As a result of the study it was proved that the most effective would be the selection activity, aimed at the selection in the population of the second cluster on the grounds - length and width of the 12th leaf, dry leaf yield and days to 50% flowering.
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