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conditional qtl mapping of Sedimentation Volume on Seven Quality Traits in Common Wheat

Journal of Integrative Agriculture 2013年第12期12卷 2125-2133页

作者： DENG Zhi-ying ZHAO Liang LIU Bin ZHANG Kun-pu CHEN Jian-sheng QU Hou-lan SUN Cai-ling ZHANG Yong-xiang TIAN Ji-chun State Key Laboratory of Crop Biology Ministry of Science and Technology/Key Laboratory of Crop Biology of Shandong ProvinceDepartment of Agronomy/Group of Wheat Quality BreedingShandong Agricultural University Agricultural Technology Popularization Station State Key Laboratory of Plant Cell and Chromosome Engineering Ministry of Science and Technology/Institute of Genetics and Developmental BiologyChinese Academy of Sciences Central Agricultural Technology Station

To evaluate the possible genetic interrelationships between flour components and the sedimentation volume（SD）,a doubled haploid（DH） population comprising 168 lines were used to identify the conditional quantitative trait loci（qtls） for SD in three *** additive qtls and 15 pairs of epistatic qtls were detected for SD through unconditional and conditional qtl *** major additive qtls were detected for SD conditioned on the seven quality *** additive qtls were found to be independent of these *** additive qtls were suppressed by three of the seven traits because of non-detection in unconditional *** pairs of epistatic qtls were completely affected by the seven traits because of detection in unconditional mapping but no-detection in conditional *** pairs of epistatic qtls were detected in conditional *** results indicated that conditional mapping could contribute to a better understanding of the interdependence of different and closely correlated traits at the qtl molecular level,especially some minor qtls were *** conditional mapping approach provides new insights that will make it possible to avoid the disadvantages of different traits by breeding through molecular design.

关键词： wheat(Triticum aestivum L.) sedimentation volume conditional qtl mapping

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Unconditional and conditional qtl mapping for Tiller Numbers at Various Stages with Single Segment Substitution Lines in Rice(Oryza sativa L.)

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Agricultural Sciences in China 2008年第3期7卷 257-265页

作者： ZHAO Fang-ming LIU Gui-fu ZHU Hai-tao DING Xiao-hua ZENG Rui-zhen ZHANG Ze-min LI Wen-tao ZHANG Gui-quan Guangdong Key Laboratory of Plant Molecular Breeding South China Agricultural University Guangzhou 510642 P.R.China

Tiller is one of the most important agronomic traits which influences quantity and quality of effective panicles and finally influences yield in rice. It is important to understand ＂static＂ and ＂dynamic＂ information of the qtls for tillers in rice. This work was the first time to simultaneously map unconditional and conditional qtls for tiller numbers at various stages by using single segment substitution lines in rice. Fourteen qtls for tiller number, distributing on the corresponding substitution segments of chromosomes 1, 2, 3, 4, 6, 7 and 8 were detected. Both the number and the effect of the qtls for tiller number were various at different stages, from 6 to 9 in the number and from 1.49 to 3.49 in the effect, respectively. Tiller number qtls expressed in a time order, mainly detected at three stages of 0-7 d, 14-21 d and 35-42 d after transplanting with 6 positive, 9 random and 6 negative expressing qtls, respectively. Each of the qtls expressed one time at least during the whole duration of rice. The tiller number at a specific stage was determined by sum of qtl effects estimated by the unconditional method, while the increasing or decreasing number in a given time interval was controlled by the total of qtl effects estimated by the conditional method. These results demonstrated that it is highly effective and accurate for mapping of the qtls by using single segment substitution lines and the conditional analysis methodology.

关键词： single segment substitution line unconditional qtl mapping conditional qtl mapping tiller number rice

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Mining Applicable Elite Alleles of Growth Duration, Plant Height and Panicle Number per Plant by conditional qtl mapping in Japonica Rice

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Rice science 2011年第3期18卷 196-203页

作者： Jian-hua JIANG[a] Qi-bing ZHAO[b] Qiang-ming LIU[a] Lan CHEN[a] Fu-long CHEN[b] Bao-jian QIAO[b] De-lin HONG[a] [a]State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural University Nanjing 210095 China [b]Fengshou Seed Corporation Limited Plantation of Sihong County of Jiangsu Province Sihong 223905 China

Unconditional and conditional qtl mapping were conducted for growth duration (GD), plant height (PH) and effective panicle number per plant (PN) using a recombinant inbred line (RIL) population derived from a cross between two japonica rice varieties Xiushui 79 and C Bao. The RIL population consisted of 254 lines was planted in two environments, Nanjing and Sihong, Jiangsu Province, China. Results showed that additive effects were major in all of qtls for GD, PH and PN detected by the two methods, and the epistatic effects explained a small proportion of phenotypic variation. No interactions were detected between additive qtl and environment, and between epistatic qtl pairs and environment. After growth duration was adjusted to an identical level, RM80-160bp was detected as an applicable elite allele for PN, with an additive effect of 0.71. When effective panicle number per plant was adjusted to an identical level, RM448-240bp was detected as an applicable elite allele for GD, with an additive effect of 4.64. After plant height was adjusted to an identical level, RM80-160bp was detected as an applicable elite allele for PN, with an additive effect of 0.62, and RM448-240bp was detected as an applicable elite allele for GD, with an additive effect of 3.89. These applicable elite alleles could be used to improve target traits without influencing the other two traits.

关键词： japonica rice growth duration plant height effective panicle number per plant unconditional qtl mapping conditional qtl mapping recombinant inbred line

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conditional and unconditional qtls mapping of gluten strength in common wheat (Triticum aestivum L.)

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Journal of Integrative Agriculture 2017年第10期16卷 2145-2155页

作者： LIU Tong-tong LIU Kai WANG Fang-fang ZHANG Ying LI Qing-fang ZHANG Kai-ran XIE Chu-peng TIAN Ji-chun CHEN Jian-sheng State Key Laboratory of Crop Biology/Group of Wheat Quality Breeding Key Laboratory of Crop Water Physiology and Drought-tolerance Germplasm Improvement Ministry of Agriculture/College of Agronomy Shandong Agricultural University Tai'an 271018 P. R. China

Dissecting the genetic relationships among gluten-related traits is important for high quality wheat breeding. Quantita- tive trait loci （qtls） analysis for gluten strength, as measured by sedimentation volume （SV） and gluten index （GI）, was performed using the qtlNetwork 2.0 software. Recombinant inbred lines （RILs） derived from the winter wheat varieties Shannong 01-35xGaocheng 9411 were used for the study. A total of seven additive qtls for gluten strength were identi- fied using an unconditional analysis. QGi1D-13 and QSv1D-14 were detected through unconditional and conditional qtls mapping, which explained 9.15-45.08% of the phenotypic variation. qtls only identified under conditional qtl mapping were located in three marker intervals： WPT-3743-GLU-D1 （1D）, WPT-7001-WMC258 （1B）, and WPT-8682-WPT-5562 （1B）. Six pairs of epistatic qtls distributed nine chromosomes were identified. Of these, two main effect qtls （QGi1D-13 and QSvlD-14） and 12 pairs of epistatic qtls were involved in interactions with the environment. The results indicated that chromosomes 1B and 1D are important for the improvement of gluten strength in common wheat. The combination of conditional and unconditional qtls mapping could be useful for a better understanding of the interdependence of different traits at the qtl molecular level.

关键词： wheat (Triticum aestivum L.) gluten strength gluten index sedimentation volume unconditional qtl mapping conditional qtl mapping

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Dynamics and genetic regulation of macronutrient concentrations during grain development in maize

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Journal of Integrative Agriculture 2024年第3期23卷 781-794页

作者： Pengcheng Li Shuangyi Yin Yunyun Wang Tianze Zhu Xinjie Zhu Minggang Ji Wenye Rui Houmiao Wang Chenwu Xu Zefeng Yang Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Agricultural CollegeYangzhou UniversityYangzhou 225009China Jiangsu Co-lnnovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009China

Nitrogen(N), phosphorus(P), and potassium(K) are essential macronutrients that are crucial not only for maize growth and development, but also for crop yield and quality. The genetic basis of macronutrient dynamics and accumulation during grain filling in maize remains largely unknown. In this study, we evaluated grain N, P, and K concentrations in 206 recombinant inbred lines generated from a cross of DH1M and T877 at six time points after pollination. We then calculated conditional phenotypic values at different time intervals to explore the dynamic characteristics of the N, P, and K concentrations. Abundant phenotypic variations were observed in the concentrations and net changes of these nutrients. Unconditional quantitative trait locus(qtl) mapping revealed 41 non-redundant qtls, including 17, 16, and 14 for the N, P, and K concentrations, respectively. conditional qtl mapping uncovered 39 non-redundant qtls related to net changes in the N, P, and K concentrations. By combining qtl, gene expression, co-expression analysis, and comparative genomic data, we identified 44, 36, and 44 candidate genes for the N, P, and K concentrations, respectively, including GRMZM2G371058 encoding a Doftype zinc finger DNA-binding family protein, which was associated with the N concentration, and GRMZM2G113967encoding a CBL-interacting protein kinase, which was related to the K concentration. The results deepen our understanding of the genetic factors controlling N, P, and K accumulation during maize grain development and provide valuable genes for the genetic improvement of nutrient concentrations in maize.

关键词： maize nutrient concentration unconditional qtl mapping conditional qtl mapping dynamic trait

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Wheat kernel dimensions:how do they contribute to kernel weight at an individual qtl level

Wheat kernel dimensions:how do they contribute to kernel wei...

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中国作物学会50周年庆祝会暨2011年学术年会

作者： Fa Cui ~(1,2),Anming Ding~1,Jun Li~1,Chunhua Zhao~1,Junming Li ~2,and Honggang Wang~(1*) 1 State Key Laboratory of Crop Biology,Shandong Key Laboratory of Crop Biology,Taian Subcenter of National Wheat Improvement Center,College of Agronomy,Shandong Agricultural University,Taian 271018,China 2 Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang,050021,Hebei,China

Kernel dimensions(KD) contribute greatly to thousand-kemel weight(TKW) in *** the present study,quantitative trait locus(qtl) for causal analysing of TKW were detected at kernel length (KL),kernel width(KW) and kernel diameter ratio(KDR) influences by both conditional and unconditional qtl mapping *** related F recombinant inbred line(RIL) populations,

关键词： Wheat Kernel dimensions Thousand-kernel weight conditional qtl mapping Genetic relationship

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qtls for flag leaf size and their influence on yield-related traits in wheat(Triticum aestivum L.)

QTLs for flag leaf size and their influence on yield-related...

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2014年中国作物学会学术年会

作者： Xiaoli Fan Fa Cui Chunhua Zhao Wei Zhang Lijuan Yang Xueqiang Zhao Qiannan Su Jun Ji Zongwu Zhao Yiping Tong Junming Li Center for Agricultural Resources Research Institute of Genetics and Developmenlal Biology Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Plant Cell and Chromosome Engineering Chinese Academy of Sciences Xinxiang Academy of Agricultural Sciences

Common wheat(Triticum aestivum L.) is one of the most important food crops *** varieties that maintain ideal leaf morphology in multiple environments are in favor of improving yield *** this study,an F recombinant inbred line population derived from the cross between KN9204 and J411 was used to detect quantitative trait loci(qtl) for flag leaf size traits(FLSTs) among eight environments and to examine the genetic effect of FLSTs on the expression of qtl for yield related trais(YTRs).A total of 38 qtl for flag leaf length(FLL),flag leaf width(FLW) and flag leaf area(FLA) were *** them,one major stable qtl for FLA(qFlaSB) was mapped to the bin of C-5BL6-0.29,with KN9204-derived allele increasing FLA significantly in the allelic effect *** to the mapping results of co-located qtl,FLW was inferred as the major contributor to affect the flag leaf *** major stable qtl for FLW(qFlw-4B.3 and qFIw-6B.2) were mapped to the bin of C-4BL5-0.71 and the bin of C-6BS5-0.76,respectively,which were valuable for improving the leaf morphology and grain output through pyramiding the elite alleles from both ***,both unconditional and conditional qtl mapping for YRTs with respect to each FLST were conducted to investigate the genetic effects of FLSTs on YRTs at the qtl *** results indicated that the expression of the qtl for YRTs which clustered with the qtl for FLSTs were generally improved by FLSTs,while their sensitivity to environments was also *** identification of qtl for FLSTs provides useful markers for wheat molecular breeding program designed to obtain desirable plant types,and the dissection of the genetic relationship between FLSTs and YRTs at the qtl level offers a foundation for further increasing yield potential.

关键词： Flag leaf related traits Yield potential Quantitative trait locus conditional qtl mapping Wheat

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Marker Based Genetic Analysis For Yield Components And Their Relationships With Developmental Stages In A European x Chinese Rapeseed DH population

Marker Based Genetic Analysis For Yield Components And Their...

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中国遗传学会植物遗传与基因组学专业委员会2005年学术研讨会

作者： BECKER Heiko ECKE Wolfgang Institute of Agronomy and Plant Breeding Georg-August-UniversityVon Siebold Strasse 837075 GoettingenGermany

In this study, we mapped qtls with additive and additive x additive epistasis as well as their interactions by environments underlying three quantitative traits of yield components using a population of 282 doubled haploid lines derived from a cross between European and Chinese rapeseed cultivars. Furthermore, we did conditional mapping analysis by combining the statistical procedures of analyzing conditional genetic effects with qtl mapping method to analyze the genetic relationship between yield components and plant developmental stages on individual qtl level. Measurements for the traits were obtained from 4 environments, 2 in Europe and 2 in China. A linkage map was constructed using 125 microsatellites marker loci. mapping results revealed in total 7, 6 and 9 qtls with additive main effects and/or additive by environment interaction effects for these three traits and collectively explained about 40, 35 and 70% of the mean phenotypic variation observed in the DH population, respectively. Digenic epistasis was small for thousand seeds weight, negligible for silique length but significant for the *** seeds per silique. Significant interaction was detected for thousand seeds weight, while minor for other two traits. The genetic relationships among these three traits were discussed on the qtl level. Information obtained from this study is valuable for marker-based selection to improve yield components and yield level. in breeding program. conditional mapping analysis revealed that qtls for thousand seeds weight were more related with flowering time and grain filling period, while qtls for the number of seeds per silique were more influenced by flowering period.

关键词： Brassica napus L. Yield components qtl mapping conditional qtl mapping Digenic interaction qtl by environment interaction

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