• Title/Summary/Keyword: 임성

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Natural Crossing of Flue -cured Tobacco Variety (황색종 연초품종의 자연교잡율)

  • 정윤화;금완수;조명조;이승철
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.38 no.6
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    • pp.495-508
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    • 1993

  • This experiment was conducted to investigate the amount of natural crossing at varying isolation distance and various transplanting time in tobacco. Normal variety and male sterile line showed an average of 1. 6 and 29% natural crossing in the adjacent plantings, respectively. The natural crossing was highest in the adjacent planting, as expected, and less at the farther distance from pollinator plants. Plants transplanted in April 20th were higher in natural crossing than those of other transplanting time.

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Cross Affinity of Korean Weedy Rice to the Cultivars (국내 수집 잡초성 벼의 재배 품종에 대한 잡종 친화성)

  • Heu, Mun-Hue;Cho, Yong-Chul;Suh, Hak-Soo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.35 no.3
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    • pp.233-238
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    • 1990

  • Weedy rice(red rice) collected in Korea were crossed with the Japonica, Javanica and Indica tester cultivars, and also crossed among those collected lines. Their seed fertility was counted and refered to their cross affinities. Some tester cultivars such as, Suweongjo, Malagkit Sinaguing and wx 817 which were regarded as belong to the Japonica, Javanica and Indica respectively, showed the typical tendencies of hybrid sterility when they were crossed each other. But, other testers such as Kwanak, Tapaiko, Belle Patna and Tarichaosun showed some differencies from those typical patterns, implying some varigations within a ecotype. The hybrids of weedy rice crossed to the Japonica testers showed higher fertility with a few semisterilities. While the crosses of weedy rice to the Javanicas or Indicas showed high sterility implying closer affinity relationships of weedy rice to the Japonicas. Even those weedy rice lines such as Samsanmyeon 8 and Sanchungaengmi B which showed semi-sterility when they were crossed to the Japonica testers showed high sterility when they were crossed to both Javanicas and Indicas. The hybrids among weedy rice lines showed high fertility raning 69% to 96%. Even those weedy rice lines which showed semi-sterility in the crosses with Japonica testers, showed high-fertility when they were crossed with those weedy rice lines. Though the amylose content, Alkali Digestive Value, Phenol reaction and grain shapes of theose weedy rice lines showed divers variations, the cross affinities of them showed closer phylogenie relationship to the Japonicas than to Japvanicas or Indicas. But the genetic influinces of Indicas to those weedy rices were not ignorable.

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Studies on the Heterosis Breeding in Rapeseed Using Cytoplasmic Genic Male Sterility 4. The Effects of Improved Domestic Lines as Pollen Parents for Fertility Restoration, Maintenance of MS Lines and the Heterosis Expression in Economic Characters in $F_1$'s. (세포질 유전자적 웅성불임 계통을 이용한 유채 Heterosis육성 개발에 관한 연구 제4보 양질유, 양질박 국내 육성계통을 화분친으로 이용한 $F_1$의 임성회복력과 MS 유지능력 및 $F_1$ 유용형질의 Heterosis 발현)

  • Jung-Il Lee;;Young-Am Chae
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.25 no.4
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    • pp.73-80
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    • 1980

  • To facilitate the heterosis breeding which utilizes cytoplasmic-genetic male sterile lines in rape (Brassica napus L.), 511 improved domestic lines were tested for their fertility restoration, maintaining ability and heterosis expression in agronomic characters. About 81 % of 511 lines showed complete fertility restoration and 11 lines could be used as maintainer of male sterility. All yield components except pod length showed greater heterotic effects than that of midparent in $F_1$. These heterotic effects resulted in extraordinary yielding ability as high as 5.6 T/ha in several $F_1$`s.

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