煙草의 諸 形質에 대한 遺傳分析 Ⅰ. 몇가지 量的 形質의 組合能力

Genetic analysis of some quantitative characters in nicotiana tabacum L. Ⅰ. Combining abilities of some quantitative characters

General and specific combining ability among eight diallel crosses in tobacco were studied for six agronomic characters and five chemical components. The eight parents and a set of 28 crosses of F₁’s and F₂’s were used as materials, and planted on Oriental’s and Burley cultural practices. Mean squares of general and specific combining ability were significant for all agronomic characters and chemical components. In the effects of general combining ability, variety Samsun in number of leaves per plant, variety Xanthi-Basma in plant height and nicotine, variety Ky 17 in leaf width and total volatile base, variety Va 509 in leaf length, days to flowering, total nitrogen and yield, and variety LA Burley 21 in protein nitrogen showed the higher GCA effects without regard to generations and cultural practices. The effects of specific combining ability were different from both generations and different cultural practices, but higher SCA effects were observed when used as parents varieties Va 509, Burley 21 and LA Bruley 21 for yield, variety Burley 21, Xanthi-Basma and Va 509 for nicotine. The negative SCA effects induced as earlier flowering were higher found to combinations between Burley 21 and Va 509, between Burley 21 and Kaba-Koulak.