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Fine Mapping of A Quantitative Trait Loci Controlling the Number of Spikelets Per Panicle in Rice
안상낙,김동민,이현숙 한국육종학회 2012 한국육종학회지 Vol.44 No.4
Spikelets per panicle (SPP) is one of the most important traits associated with rice yield. In this study, IL28, a near isogenic line (NIL) developed by introgressing chromosomal segments from ‘Moroberekan’ into ‘Ilpumbyeo’ showed significantly higher number of spikelets per panicle than the recurrent parent, ‘Ilpumbyeo’. Quantitative trait locus (QTL) analysis in 243 F2plants derived from a cross between IL28 and Ilpumbyeo indicated that a QTL for spikelets per panicle, qSPP6 was located in the interval RM3430 - RM20580. The Moroberekan allele increased SPP. The fact that QTLs for panicle length and the number of secondary branches were mapped in the same interval as qSPP6 appears to indicate that this locus was associated with panicle structure. To map the QTL more precisely, substitution mapping of qSPP6 using F3 lines was conducted. Substitution mapping with 41 F3 lines further narrowed the interval containing not only qSPP6 for spikelets per panicle but also qNDW6 for node width to about 680-kb between markers RM20521 and RM20572 based on Nipponbare genome sequence. The locus, qSPP6 is of particular interest because of its independence from undesirable height and flowering time. SSR markers tightly linked to the qSPP6 will facilitate cloning of the gene underlying this QTL as well as marker assisted selection for variation in SPP in the breeding program.
안상낙,송미화,김동민,오창식,강주원,박인규 한국육종학회 2009 한국육종학회지 Vol.41 No.3
"화원2호"는 종간교잡을 통해 화성벼의 근동질계통을 육성하고자 '97년 화성벼와 O. rufipogon을 교배하고, 계속적인 여교배와 MAS를 병행 실시하여 CR121-1-1 계통을 선발하였다. 생산력검정 시험 결과 조사된 형질 중 천립중, 출수기, 간장, 수당립수 등에서 화성벼와 차이를 보이는 화성벼 근동질계통으로, 품종보호원 출원 조건에 부합하여 "화원2호"로 명명하고 품종보호원을 출원하였다. 화원 2호는 중간모본 혹은 분자연구를 위한 재료로서도 유 "Hwaweon 2" was developed from an interspecific cross between Hwaseongbyeo and a wild species, Oryza rufipogon L. (IRGC 105491) based on marker-aided selection. The recurrent parent "Hwaseongbyeo" is a high grain quality cultivar with medium-maturity. Hwaweon 2 is nearly isogenic to Hwaseongbyeo except a small O. rufipogon introgression on chromosome 9. This segment was associated with genes controlling a number of traits including grain weight, heading date, culm length, and spikelets per panicle. The preliminary and replicated yield trial was conducted at Chungnam National University in 2004, 2005 and 2006. The local adaptability test was carried out by the National Seed Management Office (NSMO) in 2007 and 2008. This cultivar was registered to NSMO with a cultivar designated as "Hwaweon 2". This cultivar averaged 98cm in culm length and has a medium to late growth duration. This variety is resistant to stripe virus as the recurrent parent. Milled rice of "Hwaweon 2" is translucent and the grain quality traits are comparable to those of the recurrent parent. The yield potential of "Hwaweon 2" in grain is about 7.68 MT/ha at the ordinary fertilizer level about 14% higher than that of Hwaseongbyeo due to increase in grain weight and spikelets per panicle.
Effect of Low Temperature on Heterosis for Traits Related to Cold Tolerance in Japonica Rice
안상낙,정응기,예종두 한국육종학회 2004 한국육종학회지 Vol.36 No.3
Forty-four F1 hybrids derived from crosses among eleven temperate japonica rice cultivars were grown and evaluated for traits related to cold tolerance including days to heading and spikelet fertility in the cold-water irrigated plot (17oC) and the control plot. Cold water treatment had highly significant influences on all traits measured in the parents and F1 hybrids. Significant positive correlation (r=0.58**) was observed between culm length and spikelet fertility in the cold water plot whereas poor correlation (r=0.25) was detected between spikelet fertility and culm length in the control. This finding indicates that spikelet fertility is affected by culm length and the cold water depth in the cold-water irrigated plot. The amount of heterosis showed variation from trait to trait. Fertility showed the highest heterosis among the five traits in the cold-water irrigated plot. In contrast, all the traits except for panicles per plant displayed negligible heterosis in the control plot. Sizes of heterosis under both field conditions were compared. In the cold- water irrigated plot midparent and better parent heterosis for spikelet fertility and heading date and midparent heterosis for culm length were significantly higher than those in the control. For panicles per plant, in contrast, midparent and better parent heterosis were significantly higher in the control than that in the cold-water irrigated plot. Our observation that heterosis can be expressed under low temperature conditions supports the idea that japonica hybrids can be grown in low temperature-prone areas where the limited growing period due to low temperature poses a ceiling on the cultivation of productive, cold-susceptible and medium-to late maturing japonica cultivars.