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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.
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.
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.
雄株間播 및 栽植密度가 交雜種 옥수수 種子親의 生育 및 採種量에 미치는 影響
S. U. Park(朴勝義),S. K. Jong(鄭丞根),K. Y. Park(朴根龍),H. G. Moon(文賢貴) 한국육종학회 1983 한국육종학회지 Vol.15 No.2
Solid planting or male-interplanting method has been used successtully in hybrid seed production in Korea since 1978. However, some managerial disadvantages such as side-dressing, weed control and detasseling were resulted in due to narrower distances between male and female rows. Studies were made to understand the effects of planting patterns and popuation densities on the growth and seed production of parental inbred of maize single cross. Solid planting and 1:2 planting patterns were compared in three population densities ranging from 5,000 to 8,300 plants of seed parent per 10 ares. Tasseling and silking dates were not affected by planting patterns or population densities, but plant height seemed to higher at higher population densities. Seed production was higher in solid planting than 1: 2 planting pattern under the same popuation density. But the yield advantage of solid planting was not obseved when population density of seed parent was similar in both planting patterns. A significant increase of seed production was obtained at 8,300plants of seed parent per 10 ares However, seed size was smaller at higher densities. Number of ears per unit area, number of kernels per ear and 100 kernel weight were important yield components determining seed yield.