黃色種 煙草(nicotiana tabacum L.)의 主要形質과 葉位別 葉形質에 對한 遺傳分析 Ⅰ. 二面交配에 依한 雜種强勢와 組合能力

Genetic analysis for agronomic, chemical and leaf characters according to stalk position in flue-cured tobacco(nicotiana tabacum L.) Ⅰ. Heterosis and Combining Ability by Diallel Crosses

The experiment was conducted to obtain basic information on breeding of flue-cured tobacco varieties. Nine cultivars and partial diallel set of 36 Fi hybrids were grown at Daegu Experiment Station, Korea Ginseng and Tobacco Research Institute in 1983. The average heterosis for yield, stalk height, leaf weight, leaf length, leaf width and midrib weight was significantly positive. Negative heterosis was shown for leaves per plant, days to flower and leaf shape index. The estimated variance in the general combining ability(GCA) was highly significant for all characters and specific combining ability(SCA) also showed significance for’ all characters except reducing sugar content and leaf length in the middle leaves. The variance of GCA was larger than SCA for all characters. NC 2326 and NC 628 had high positive GCA effect for yield, leaf weight, leaf length, leaf width, midrib weight and midrib width Mc Nair 373 and DG-72 showed negative GCA effect for all characters of leaf and midrib in the both stalk positions.