• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.2
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• pp.151-156
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• 1987

Eleven F$_1$ rice hybrids were developed by using the genetic male sterile lines having the backgrounds of Korean variety. The average heterosis, heterobeltiosis and standard heterosis for grain yield were 15.2%, 8.7% and 17.9%, respectively. Significant heterobe1tiosis for number of grains per panicle was observed. The leaf blast reaction of the hybrids was mostly similar to that of the more resistant parent. Amylose content of the hybrids ranged from 20.5% to 22.5% and protein content from 10.4% to 11.1%. The degrees of alkali digestion value, white center or white belly, clearance and heading date of the hybrids were almost same as their parents.

• Journal of Sericultural and Entomological Science
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• v.1
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• pp.5-8
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• 1960

가잠에 있어 교잡제1대가 실용상 유리한것은 1841년 Robinert씨가 처음 실험한 보고가 있었고 일본에 있어서는 1906년 외출구태랑씨가 구주관후 귀국즉시 일대잡종이 경제상 유리한 점을 주장하면서 일방으로는 국립잠업시험장에서 우선 시험하여 장려해온 결과 1912 년경부터 점차보급되어 기후 1920년경에는 사견의 전부가 일대잡종으로 전환되었다. 1917년 일본잠업시험장 보고에 의하면(총괄적보고) 1. 일반으로 사육일수는 원종의 어느편보다 또는 기평균식보다 단축한다. (중략)

• FLOWER RESEARCH JOURNAL
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• v.16 no.4
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• pp.304-308
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• 2008

Lilium longiflorum 'Charm' as a $F_1$ hybrid cultivar was released by crossing inbred line '$L_2$-14' and '$L_2$-21' which were obtained from 5 self crosses originated from 'Nellie White', 'Ace' and 'Hinomoto'. The growth and flowering characteristics were evaluated in a greenhouse maintained at a minimum of $13^{\circ}C$ at night during winter in 2006 and 2007. The flower of 'Charm' is white color and horizontal-facing. The flower number of a plant and its diameter is 7.4 and 16.5 cm with 24.5 ornamental(flowering) days. The plant height is 60.3 cm with 70.3 number of leaves. The stem diameter and internode length is 1.2 cm and 1.1 cm, respectively, meaning the plant is compact and sturdy. And the number of seed per a capsule is 251.1. The results of these evaluation, therefore, suggest that seedling Lilium longiflorum 'Charm' can be used as a pot plant due to its short stems, many number of flowers per plant, long ornamental period, strong growth habit with many leaves and thick stem diameter.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.25 no.3
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• pp.21-30
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• 1980

This is the fourth report in serial studies on the botanical characters of Korean maize lines collected. Several plant characters and genetical nature of lines were investigated and compared among selfed, sibbed and test crossed lines. Inbreeding depression and heterosis, and homozygosity expressed in percent were calculated. Throughout the study a great extent of variation of plant characters and genetical variation expressed in terms of inbreeding depression and heterosis were observed. The observed plant and genetic variation of plant characters were assumed to be enough for providing new breeding materials for future maize breeding program. The degree of homozygosity of Korean local maize lines suggested that a great portion of maize grown by Korean farmers presently are near or close to inbred and presumed to show a great heterosis when crossed to divergent lines.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.5
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• pp.418-424
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• 1993

In order to test combining ability of the cytoplasmic-genetic male sterile(CGMS) and restorer lines with backgrounds of Korean japonica rice varieties, diallel crosses were made among the early maturing CGMS lines Sobaegbyeo A, Odaebyeo A, Gwanagbyeo A and Daeseongbyeo A, and the restorer lines Sobaegbyeo R, Odaebyeo R, Gwanagbyeo Rand Daeseongbyeo R, and among the medium maturing CGMS lines Hwajinbyeo A, Paldal A, Suwon 224 A and Iri 386 A and the restorer lines Hwajinbyeo R, Paldal R, Suwon 224 Rand Iri 386 R, and among the late maturing CGMS lines Nagdongbyeo A, Palkweng A, Hwacheongbyeo A and Milyang 97 A and the restorer lines Nagdongbyeo R, Palkweng R, H wacheongbyeo Rand Milyang 97 R. The fourty eight combinations of the hybrids, their parents and the maintainers were grown in field condition in 1992. General combining ability, relative specific combining ability and relative combining ability for yield of the CGMS and restorer lines were tested. Combining ability of the CGMS lines Odaebyeo A, Iri 386 A, Nagdongbyeo A and Palkweng A, and of the restorer lines Odaebyeo R, Hwajinbyeo R, Hwacheongbyeo Rand Palkweng R was relatively high. Heterobeltiosis for grain yield over the better parent of the early maturing hybrids ranged from -17 % to 15%, and that of the medium maturing ones from -4% to 22%, and that of the late maturing ones from -46% to 30% respectively, Standard heterosis over the standard variety of the early maturing hybrids ranged from -13 % to 12 %, and that of the medium maturing ones from 0 % to 26%, and that of the late maturing ones from -38% to 26% respectively, Positive and negative heterosis for grain yield of the hybrid rices were observed depending on cross combinations, In the positive heterosis hybrids, number of panicles per hill and number of spikelets per panicle contributed mostly to grain yield, while in the negative heterosis hybrids, spikelet fertility and 1000 grain weight were closely correlated to grain yield. Amylose content of the hybrid rices, maintainer and restorer lines was mostly lower than 20 %, and alkali digestion value was higher than 6.0. Grain appearance of the hybrids tested was similar to the korean japonica rice varieties.

• Journal of Korean Society of Forest Science
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• v.66 no.1
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• pp.109-117
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• 1984

Allozyme study for open pollinated seeds of forty nine pitch pine families in an $F_1$-hybrid seed orchard demonstrated that allozyme variants in aspartate aminotransferase(AAT), glutamate dehydrogenase(GDH) and leucine aminopeptidase(LAP) systems are encoded by at Least eight loci; five for AAT, one for GDH and two fur LAP. Allozyme variations showed polymorphisms at seven of the eight loci, except GDH. Average number of alleles examined over six loci were 2.33 and 2.67 for maternal and progeny groups, respectively. Average heterozygosity and genetic diversity computed over six loci were, respectively, 0.235 and 5.409 for maternal tree group, 0.238 and 5.569 for progeny group. The proportion of $F_1$-hybrid seeds estimated by allozyme analysis was 0.77%. The estimated proportion of $F_1$ hybrid seeds by allozyme study is in good agreement with the value 0.73% estimated by morphological study for the proportion of pitch ${\times}$ Loblolly $F_1$ hybrid seedlings at a nursery. Indications for Wahlund effect, high levels of self-fertilization and for non-random matings in the $F_1$ hybrid seed orchard call for cautions in estimating allele frequency changes and mating probabilities for the parental and progeny groups.

• Journal of Practical Agriculture & Fisheries Research
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• v.23 no.2
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• pp.25-32
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• 2021

There is a need to breed and distribute of domestic varieties for Lilium longiflorum because most of the lily bulbs cultivated in Korea were imported from foreign country. The L. longiflorum 'Ace' and 'Nellie White' collected from 1996 had been self-crossed from 1996 to 2010. In 2012, the L. longiflorum 'Bright LoSong' was developed as a F₁ hybrid crossed between 'L₂-17-4' and 'L₂-16-6' that obtained by 7th self-fertilization. The 'Bright LoSong' was tested for homogeneity, regional adaptability test, consumer preference show from 2014 to 2015, and it was registered in 2017. The flower of 'Bright LoSong' is a trumpet shaped single flower with no spots.It has 5.8 flowers per plant, which is a relatively many number compared control 'Mount Carmel', Its flower diamater is 9.8cm, relatively a bit small size. And the flower inflorescence has umbel or raceme while the attitude of longitudinal axis is horizontal. The plant height is 38.4cm with 30.8 leaves per plant and 1.9cm of the leaf width. 'Bright LoSong' has a longer flowering period because of relatively small diameter or many number of flowers than those of the control 'Mount Carmel'. Thus, the 'Bright LoSong' showed a high consumer preference, and the cultivar has the advantage of being able to reproduce since the parents are pure lines.

• Proceedings of the Korean Society of Crop Science Conference
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• 1994.10a
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• pp.18-19
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• 1994

• Proceedings of the Korean Society of Tobacco Science Conference
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• 1998.05a
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• pp.26-26
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• 1998

• Proceedings of the Korean Society of Tobacco Science Conference
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• 2001.05a
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• pp.35-43
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• 2001

일대잡종육종이란 현대의 다양한 육종기술 중 하나로 교배 제1세대의 잡종강세현상을 곧바로 이용하는 것으로 여러 작물에서 실용적으로 이용되고 있다. F$_1$잡종종자를 생산하려면 자가수분을 통제해야 하는데 웅성불임을 이용하면 자친의 화분제거 노력이 생력되어 경제적인 종자생산이 가능하다. 연초는 자식성 작물로 잡종강세는 높지 않으나 종간 교잡에 의한 cms가 만들어진 이후 버어리종 등에서는 60년대부터 직적형질에 가깝게 유전되는 우성 단일유전자의 지배를 받는 N. logniflora의 역병(race 0)저항성을 도입한 웅성불임(cms) F$_1$잡종이 활발하게 이용되어 왔다. 최근에는 cms F$_1$잡종의 이용영역이 넓어져 우리나라의 경우 N. glutinosa에서 유래한 우성 단일인자 TMV저항성을 도입한 황색종 cms F$_1$잡종 KF 114가 주 재배품종이 되었고 버어리종에서는 VAM에서 유래한 열성단일유전자의 지배를 받는 PVY저항성이 도입된 KB 111의 확대재배가 예상되고 있다. 본 글에서는 cms F$_1$잡종의 국내외 이용 사례를 살펴보고 cms F$_1$잡종의 육성과 이용방향, cms F$_1$잡종 종자생산에 관하여 기술하였다. 그리고 병저항성뿐 아니라 알칼로이드함량, 염록소함량, DVT나 챤-abienol 및 SE함량 등 질적형질에 가깝게 유전되고 유전양식이 명확하게 밝혀진 화학성분에 대해서도 F$_1$잡종 육성의 대상 형질로 논의하였다.