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RISS 인기검색어
- 검색키워드
- 저자 : Hong Seok Lee(李弘䄷 ) (검색결과 3 건)
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Hong Seok Lee(李弘䄷,),Chang Hwan Cho(曺章煥),Eun Seop Lee(李殷燮),Byong Hee Hong(洪丙憙),Eun Hee Hong(洪殷憙),Keun Yong Park(朴根龍) 한국육종학회 1985 한국육종학회지 Vol.17 No.3
For upland crops the returns from the investment in variety developmet and improvement are manifested through the increased production and superior quality of the crops grown from the new varieties. The varieties must be distributed widely, and rapidly, and sufficient seed or vegetatively propagated materials must be produced so that the varieties can be grown on the farms in the area in which it is adapted. The benefits from the improved varieties can be realized through growing the certified seed with sufficient genetic identity, purity and plumpness. Of the upland crops including wheat and barley, soybeans and other legumes, minor cereals and root and tuber crops, currently important crops were evaluated for the current situation and problems of seed renewing systems, and for the status of the crop production and demand and supply to find out practical problems in seed production. Solutions to the problems have generally been found from the investigation and long experience. For increased production and grain quality improvement of malting barley and rye, seed renewing programs should be strengthened in the near future. Certified seed supply and shortening of good quality seed renewing-year interval must be made through improvement of varietal and regional seed renewing systems. Particularly, for emergent need of wheat seed, foundation seed storing system must be established. In, soybeans six-year interval renewing system would be desirable in practice and should be fully practiced. Soybean seed production has been conducted by the Farmer’s Corporation Agency in accordance with increased soybean production assistance plan. However, certified seed production system and good quality seed production techniques must be applied desirably. Government-leading purchase price for the soybeans produced by farmers must be increased for farmers’ willingness to produce more soybeans. For corn sufficient amount of certified seed must be produced because a quantity of corn seed has been imported to meet the demand. In 1990, estimated amount of corn seed 1,500 to 2,000 M/T would be needed for silage and grain corn production. Past experience of suplus corn seed suggests that low temperature seed storage facility is to be facilitated for safe storage of high quality of corn seed.
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Keun Jin Choi(崔根鎭),Seung Eui Park(朴勝義),Moon Sup Chin(陳文燮),Hong Seok Lee(李弘䄷,),Keun Young Park(朴根龍) 한국육종학회 1994 한국육종학회지 Vol.26 No.1
High heterosis was expressed in the days from silking to ear leaf senescence(DELS) of F₁ and even in that of F₂ population with Hi39/KS75. In the number of fresh leaf, fresh leaf area and chlorophyll content, highly positive heterosis was observed in F₁ but negative heterosis in F₂ population except Hi39/KS75. Inbreeding depression in the number of fresh leaf, fresh leaf area and chlorophyll content appeared remarkably with the progress of growth especially from 37 to 52 days after silking(DAS) in April 23 planting, but Hi39/KS75 had low inbreeding depression in DELS compared to other two F₂ populations. Among the characters related to stay-green, the number of fresh leaf showed the highest heritability in the crosses with three inbreds Ga209, Hi39 and KS75. The other characters except the days to maturity also exhibited relatively high heritability. Hi39/KS75 showed very high heritability irrespective of planting dates. The stay-green score was found to be significantly correlated with the number of fresh leaf, fresh leaf area and chlorophyll content at the DAS 52. A multiple regression analysis with F₂ population revealed that the number of fresh leaf was much accountable for the variation in DELS and stay-green score, but less accountable in later growing stage.
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Keun Jin choi(崔根鎭),Keun Yong Park(朴根龍),Hong Seok Lee(李弘䄷,) 한국육종학회 1995 한국육종학회지 Vol.27 No.1
Maize yield could be increased by selecting promising individual plants with ideal plant type not only for total leaf area index(LAI), but also for larger leaf size near the extremes of the canopy. This approach might have limits as total LAI is increased unless selection for leaf angle is practiced concurrently because above leaf angle is very important to increase the productivity at greater LAI than 5.0. Estimated value for leaf angle at the third leaf above and below the ear leaf, and for leaf width and length of topmost ear leaf of three inbred lines and their diallel cross F₁ and F₂ were obtained to investigate the inheritance of leaf angle, width and length. Third leaf above the ear leaf of topmost ear was tied more errect than that of third leaf below the ear leaf. Leaf width became larger when planted on April 23 than May 22, but leaf length became little longer when planted on May 22 than April 23. The cross between two inbreds with maximum-different leaf angle was 41.7˚ for the above leaf, and 31.0˚ for the below leaf expressed high heterosis in F₁ and F₂ population. Leaf angle showed the highest heritability (0.508) among three leaf characters. Among three crosses, Hi39/KS75 showed the highest heritability for leaf angle and length, and Ga209/KS75 for leaf width. Leaf angle, width and length revealed normal distributions in F₂ populations. The erect type, larger and longer leaf presented complete or partial dominance. The frequency distribution patterns of three characters showed similar curvatures at two planting times in F₂ populations of three crosses.
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