Selection of testers for combining ability analysis and relationship between per se performance and GCA [general combining ability] in sunflower
1997
Virupakshappa, K. | Nehru, S.D. | Gowda, J. | Hegde, S. (GKVK, Bangalore (India). U.A.S., Project Co-ordinating Unit, Sunflower)
Studies were conducted to determine the optimum number of testers required to rank lines according to their GCA (general combining ability) and to understand the quantitative relationship between per se performance and combining ability of the lines in sunflower. Forty-eight lines were crossed to 3 types of testers; an inbred, an open pollinated population and a single cross hybrid. The hybrids were evaluated during summer 1994. Spearman's rank correlation coefficient indicated that the 3 testers as well as 2 tester combinations ranked the lines similarly for GCA (general combining ability). The correlations between per se performance and GCA (general combining ability) were not significant for the studied characters except for days to 50 per cent flowering, days to maturity, plant height and oil content. Hence per se performance cannot be taken as a criterion for high GCA (general combining ability) for yield and means of its components
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