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Combining ability for tassel characteristics in corn (Zea mays L.)
S. K. Jong(鄭丞根) 한국육종학회 1984 한국육종학회지 Vol.16 No.1
Fourty-five hybrids of a 10-entry diallel cross involving five Corn Belt inbreds and five tropical inbreds were tested to study the combining abilities for eight tassel characteristics. Corn Belt inbreds B 37, B 68, Mo 17 and Oh 545 produced hybrids with long or short tassel and a few branches, while tropical inbreds Hi 27, Hi 28 and Mp 68 : 616 produced hybrids with long or short tassel and many branches. Bath general and specific combining ability effects were highly significant for all tassel characteristics studied, indicating that both additive and nonadditive gene effects are involved. However, the predominance of GCA effects indicated the possible selection of hybrids with small tassel based on the individual inbreds. Two Corn Belt inbreds B 37 and B 68 appeared as the best combiners for the small tassel size in hybrids. Insignificant phenotypic correlations between length traits and branch number traits indicated the possible independent inheritance of these two tassel characters.
고구마의 몇가지 形質에 對한 一般 및 特殊組合 能力에 關한 硏究
S. K. Jong(鄭丞根) 한국육종학회 1974 한국육종학회지 Vol.6 No.2
Among 6 sweet potato (lponwea batatas Lam) clones studied TIS-2129 exhibiited high general combining ability variance component and low specific combining ability variance component for tuberous root weight, average size cf tuberous root, dry matter percentage, dry weight of tuberous root and top weight and clone TIS-2172 had high general combining ability variance component for the number of tuberous root and dry matter percentage. It is suggested that the additive genetic variance is more important than nonadditive. genetic variance in determining tuberous root weight, average size of tuberous root, dry matter percentage, dry weight of tuberous root and top weight. But for the number of tuberous root per plant the main component cf genetic variance is of the nonadditive type.
Joint combining ability and regression analysis for the study of genotype environment interactions
Seung Keun Jong(鄭丞根) 한국육종학회 1981 한국육종학회지 Vol.13 No.3
Statistical procedures to analyse joint combining ability and regression analysis are presented following Griffing (1956), Singh (1974) and Lin et al. (1977). Procedures of calculating sums of squares for Method I, II, III and IV and analysis of variance tables are also provided. A numerical example of analysis-IV is also used to show the advantages of this method in selecting parents for better performance with high stability.
Seung Keun Jong(鄭丞根),Hyeon Gui Moon(文賢貴),Bong Ho Choe(崔鳳鎬),Keun Yong Park(朴根龍) 한국육종학회 1986 한국육종학회지 Vol.18 No.1
Black streaked dwarf virus(BSDV) is one of the most important diseases of corn(Zea nays L.) in Korea. Dissemination of new high yielding corn hybrids is limited to the southern areas due to only this epidemic disease. There are no known published reports concerning the inheritance of reaction to BSDV in corn. This study was conducted to select resistant genotypes to BSDV and elucidate the genetic control of resistance to BSDV. Total of 965 local collections, introduced inbreds and hybrids were screened under field conditions in 1980 and 1981, 8-entry diallel crosses were tested in 1980 and generation mean analysis of parental, F₁, F₂ and backcross populations from the crosses of 5 resistant and susceptible lines were made under field conditions in 1981. Nine Korean local collections, KL-2, KL-10, KL-11, K79004, K79091, K79111, K79123 and K79124, and one introduced inbred, Ga 209, were selected as resistant genotypes to BSDV. Only specific combining ability was appeared to be significant in determination of BSDV resistance in the diallel analysis, indicating the relative importance of nonadditive genes for BSDV resistance. Crosses between resistant local collections and susceptible introduced inbreds such as KS15×KL-7, KS15×KL-1, KL-4×KS15 and KL-5×A635 showed high specific combining ability effects to increase resistance to BSDV in their F₁s. Generation mean analysis also indicated that dominance effect was more important than additive gene effect in inheritance of resistance to BSDV in corn, although the relative importance varied with the populations. Significant heterosis effect was also detected between resistant and susceptible lines. This study suggested that BSDV reaction in tested lines was conditioned by primarily nonadditive genes and breeding for resistant to this disease should be effectively accomplished by reciprocal recurrent selection procedure.
수도의 건물생산 및 배분의 수리적 연구 III. 재식밀도에 따른 부위별 건물배분
조동삼,정승근,허훈,육창수,Cho, Dong-Sam,Jong, Seung-Keun,Heo, Hoon,Yuk, Chang-Soo 한국작물학회 1990 한국작물학회지 Vol.35 No.4
In developing dynamic growth model of a crop, it is important to estimate accurate dry matter partition to different parts of crop plants. Two rice varieties, Samkang and Chucheong, were transnplanted with three planting densities of 72. 90 and 120 hills per 3.3㎡ on May 30 and June 15 in 1988 to study the effect of planting density on dry matter partition in rice plants. Total dry wight per square meter of two varieteis in May 30 transplanting were greater than those in June 15 transplanting. Total dry wights were increased as planting density was increased. The response of dry weights of differents parts of rice plants per hill were decreased as the density was increased. Although the difference in dry weights of leaf blade and stem and sheath between two varieties was not great, greater ear weight of Samkang resulted in greater total dry weight than that of Chucheong. Despite of transplant in date and planting density on dry weights, the ratio of dry matter partition to different parts of rice plants at a certain growth stage remained constant. Estimated dry weights of different parts at two stages of growth based on average ratio of dry matter partition over two transplantion dates and planting densities agreed well with those observed.
수도의 건물 생산 및 배분의 수리적연구 II. 이앙기에 따른 부위별 건물배분
조동삼,정승근,허훈,육창수,Cho, Dong-Sam,Jong, Seung-Keun,Heo, Hoon,Yuk, Chang-Soo 한국작물학회 1990 한국작물학회지 Vol.35 No.3
Two rice varieties, Samkangbyeo and Sangpungbyeo, were transplanted on 1/2000a pots at 6 different dates beginning on May 11 with 10 day interval in 1987 and at 4 different dates beginning on May 21 with 10 day interval in a paddy field at the Chungbuk Provincial Rural Development Administration. Dry matter distributions to stem and leaf sheath, leaves and ear at different growth stages were analyzed to provide basic informations neccessary for the development of dynamic growth model. Dry matter production was reduced as transplanting was delayed and the degree of reduction was greater at the transplanting later than June 1. Dry matter distribution to stem and leaf sheath was increased up to 60-70 days after transplanting with the maximum ratio between 60-70%, which were decreased to 37-43% in pots and 27-33% in field at the end of ripening stage. On the other hand, dry matter distribution to leaf blade was decreased from 40-50% at transplanting to 11-17% at harvesting. Ear dry matter distribution increased rapidly after heading and the distribution ratio was 42-49% in pots and 52-62% in field. Although regression equations to predict dry matter distribution to different parts of rice plant were satisfactory for individual experiment, the application to different experiment was not appropriate.
除雄時 葉損失 및 花粉親 除去時期가 옥수수 交雜種의 採種量에 치는 影響
S. U. Park(朴勝義),S. K. Jong(鄭丞根),K. Y. Par(朴根龍),S. K. Kim(金順權) 한국육종학회 1984 한국육종학회지 Vol.16 No.1
Two field experiments were conducted to study the effects of leaf damage at detasseling and removal time of pollen parent on hybrid seed yield in solid planted corn seed production field. Corn. inbreds KS 5 (seed paent) and KS6 (pollen parent) were planted in a solid planting pattern at Crop Experiment Station, Suweon. Top 1,2 and 3 leaves of seed parent were removed at detasseling, respectively, in 1978 and pollen parent was removed 5 times with 5 day interval begining 5 days after silking of seed parent in 1979. Leaf damage up to top 2 leaves showed no significant effects en seed yield and seed size. However, the results indicated the possible detrimental effect of leaf damage more than 3 top leaves on seed yield. Ear Length, ear diameter and 100 kernel weight appeared to be decreased as removal of pollen parent was delayed. Regression analysis shoved that 2.2 ㎏ of seed yield per l0a were decreased as pollen parent removal was delayed 1 day by 25 days ofter silking.