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【期刊论文】Mapping of QTLs for leaf developmental behavior in rice (Oryza sativa L.)
董彦君, Yanjun Dong, Hiroshi Kamiunten, Tsugufumi Ogawa, Eiji Tsuzuki, Hiroyuki Terao, Dongzhi Lin & Mitsuhiro Matsuo
Euphytica 138: 169-175, 2004.,-0001,():
-1年11月30日
Days to emergence of flag leaf,, leaf emergence rate,, QTL analysis,, recombinant inbred lines,, total number of leaves,, rice(, Oryza sativa L., ),
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【期刊论文】Mapping of QTL for Embryo Size in Rice
董彦君, Yanjun Dong, Eiji Tsuzuki, Hiroshi Kamiunten, Hiroyuki Terao, and Dongzhi Lin
Published in Crop Sci. 43: 1068-1071 (2003),-0001,():
-1年11月30日
The development of molecular genetic maps has accelerated the identification and mapping of genomic regions controlling quantitative trait loci(QTL) in rice (Oryza sativa L.). Minimizing embryo size in rice would increase proportion of edible endosperm.This study was conducted to determine the genetic basis controlling embryo size of rice grains in a recombinant inbred (RI) population derived from cross of a japonica cultivar,Asominori,with an indica cultivar,IR24,by means of 289 restriction fragment length polymorphism (PFLP)markers.Two parameters,embryo length and embryo width,which represent embryo size in rice,were estimated for each RI line and their parental varieties.Continuous distributions and transgressive segregations of embryo length and embryo width in rice were observed in the RI population,suggesting that embryo size was quantitative in grains of conventional varieties.Three QTL for embryo length were detected on chromosomes 1, 2, and 3 explained 17.9, 25.7, and 9.2%, respectively, of the total phenotypic variation. Three QTL for the embryo width were observed on chromosome 2, 8, and 10 and accounted for 13.5, 15.7, and 15.0% of total phenotypic variation, respectively. In addition, alleles with increasing and decreasing effects were detected from the both parents. The results and the tightly linked molecular markers that flank the QTL will be useful in breeding for embryo improvement in rice.
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董彦君, Yanjun Dong, E.Tsuzuki, Kamiunten, H.Terao, Dongzhi Lin, M.Matsuo, Yunfei Zheng
Field Crops Research 81 (2003) 133-139,-0001,():
-1年11月30日
One of the most important agronomic problems in rice production (Oryza sativa L.) in high humidity climates is pre-harvest sprouting (PHS). This study was conducted to identify quantitative trait loci(QITs) for PHS resistance using a recombinant inbred (RI) population derived from a cross between a japonica variety Asominori (relatively susceptible to PHS) and an indica variety IR24 (highly resistant to PHS). Knowledge of the genomic positions of QTLs for PHS resistance in rice could greatly simplify selection of the trait.A total of six QTLs for PHS resistance in rice were detected with 289 restriction fragment length polymorphism (RFLP) markers by both one marker analysis (P<0.005) and composite interval mapping (CIM)(LOD>2.0).The two QTLs,located on chromosome 1, accounted for 10.7-20.o% of total phenotypic variations, and the other four QTLs, located on chromosome 4,5,7 and 8,respectively, explained 12.3-25.3% of total phenotypic variation. As a result, four alleles from IR24 on chromosomes 1 (two QTLs),5,7and two alleles from Asominori on chromosomes 4,8 contributed to PHS resistance in rice,respectively.The RFLP markers tightly linked to PHS resistance in rice may be useful for breeding varieties with greater resistance to PHS and adaptable to high humidity climates during the maturation period through the ues of markerassisted selection.
Quantiative trait loci (, QTLs), , Pre-harvest sprouting(, PHS), resistance, Dormancy, Rice(, Oryza sativa L., ),
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董彦君, Yanjun Dong, Wenqi Dong, Shouyun Shi and Qingsheng Jin
Breeding Science 51: 1-4 (2001),-0001,():
-1年11月30日
A thermo-sensitve seedling-colour mutant 7436S was detected in the field from a breeding nursery in China, in 1991. The experiments were conducted at artificially controlled temperatures (23.1℃,26.1℃,30.1℃) in growth chambers. The results showed that the seedling colour of the mutant 7436S was white (23.1℃), light yellow (26.1℃) and normal green (30.1℃) at 10 days after sowing and yellwish green (23.1℃) and normal green (26.1℃,30.1℃) at 20 days after sowing, respectively. It was concluded that its thermo-sensitivity decreased gradually with the increase of the seedling age. In addition, its thermo-sensitivity for seedling colour was oriented, as white seedlings turned green at high temperatures, but not in the opposite direction. The segregation ratios in the F2 populations showed that a recessive nuclear gene (tentatively designated as tsc-1) controlled the thermo-sensitive seedling-colour character. Based on genetic linkage and the recombination value (34.1%) between the tsc-1 gene and short panicle morphological marker(sp) gene in the F2 generation, the results indicated that the tsc-1 gene was located on chromosome 11.
thermo-sensitive, seedling colour, marker gene, rice
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董彦君, Yanjun Dong, Zhongnan Yang, Jianlong Xu, Dongzhi Lin, Yasuhiro Sugimoto, Lijun Luo, Hanwei Mei
Communications in Biometry and Crop Science Vol. 2, No. 1, 2007, pp. 1-7,-0001,():
-1年11月30日
Knowledge of the genetics of leaf chlorophyll content (LCC) at tillering and heading stages should help develop rice varieties with high photosynthetic ability. In this study, 182 backcross-recombinant inbred lines (BIL), derived from Koshihikari (japonica)/Kasalath (indica)//Koshihikari, were used to identify quantitative trait loci (QTL) for LCC at the tillering and heading stages of rice. Continuous variation and transgressive segregation for LCC were observed in the BIL population, indicating that LCC was a quantitatively inherited trait. Seven QTL for LCC were identified and mapped to chromosomes 1 (two QTL), 2, 3, 4, 6, and 8, which individually accounted for 5.1 to 14.8% of the total phenotypic variation. Three QTL (qLCC-1-1, qLCC-1-2 and qLCC-4) were common between the tillering and heading stages. The alleles at four QTL (qLCC-1-1, qLCC-1-2, qLCC-2, and qLCC-8) from Koshihikari and the alleles at the other three QTL (qLCC-3, qLCC-4 and qLCC-6) from Kasalath increased LCC. The tightly linked molecular markers flanking the QTL detected in this study should be useful in improving photosynthetic ability in rice.
leaf chlorophyll content (, LCC), , quantitative trait locus (, QTL), , rice.,
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