Combining abilities and mode of inheritance of yield components in wheat (Triticum sp.)
2003
Ivanovic, B.
Using the line x tester analysis (Sing and Choudhary, 1979), we studied the combining ability, gene effects and mode of inheritance of plant height, number of spikelets per spike, grain weight per spike and harvest index, using 5 lines, 3 testers and 15 hybrids of bread and durum wheat. The results of the study show that nonadditive genes play the most important role in the inheritance of plant height, grain weight per spike and harvest index. Additive gene effects have been found to be more important than nonadditive ones in the inheritance of the number of spikelets per spike in case of Triticum aestivum, and in the inheritance of the plant height in case of the Triticum aestivum in the first year of the research. The mode of inheritance of characters under study depended on the cross combination and the year of growing. In most cases the mode of inheritance was dominant. On the basis of GCA (general combining ability) and SCA (special combining ability) for all analysed characters, it can be concluded that the best general combiner in case of Triticum aestivum was the line NS 31/96, and in case of Triticum turgidum var. durum, it was the Yantar odeskij. In most cases, the genotypes with negative and positive GCA (general combining ability) values produced hybrids with the best SCA (special combining ability).
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