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Development of Oryza rufipogon and O. sativa introgression lines and Assessment for Yield-related Quantitative Trait Loci

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Journal of Integrative Plant Biology 2007年第6期49卷 871-884页

作者： Lubin Tan Department of Plant Genetics and Breeding and State Key Laboratory of Agro-biotechnology China Agricultural University Beijing 100094 China Key Laboratory of Crop Heterosis and Utilization of Ministry of Education Beijing 100094 China Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture China Agricultural University Beijing 100094 China Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100094 China

introgression lines population was effectively used in mapping quantitative trait loci （QTLs）, identifying favorable genes, discovering hidden genetic variation, evaluating the action or interaction of QTLs in multiple conditions and providing the favorable experimental materials for plant breeding and genetic research. In this study, an advanced backcross and consecutive selfing strategy was used to develop introgression lines （ILs）, which derived from an accession of Oryza rufipogon Griff. collected from Yuanjiang County, Yunnan Province of China, as the donor, and an elite indica cultivar Teqing （O. sativa L.）, as the recipient. introgression segments from O. rufipogon were screened using 179 polymorphic simple sequence repeats （SSR） markers in the genome of each IL. Introgressed segments carried by the introgression lines population contained 120 ILs covering the whole O. rufipogon genome. The mean number of homozygous O. rufipogon segments per introgression line was about 3.88. The average length of introgressed segments was approximate 25.5 cM, and about 20.8% of these segments had sizes less than 10 cM. The genome of each IL harbored the chromosomal fragments of O. rufipogon ranging from 0.54% to 23.7%, with an overall average of 5.79%. At each locus, the ratio of substitution of O. rufipogon alleles had a range of 1.67-9.33, with an average of 5.50. A wide range of alterations in morphological and yield-related traits were also found in the introgression lines population. Using single-point analysis, a total of 37 putative QTLs for yield and yield components were detected at two sites with 7%-20% explaining the phenotypic variance. Nineteen QTLs （51.4%） were detected at both sites, and the alleles from O. rufipogon at fifteen loci （40.5%） improved the yield and yield components in the Teqing background. These O. rufipogon-O, sativa introgression lines will serve as genetic materials for identifying and using favorable genes from common wild rice.

关键词： common wild rice cultivated rice introgression lines quantitative trait locus yield-related trait.

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Dissection of heterosis for yield and related traits using populations derived from introgression lines in rice

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The Crop Journal 2016年第6期4卷 468-478页

作者： Chao Xiang Hongjun Zhang Hui Wang Shaobo Wei Binying Fu Jiafa Xia Zefu Li Yongming Gao Guoyou Ye Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement Chinese Academy of Agricultural Sciences Rice Research Institute Anhui Academy of Agricultural Sciences Genetics and Biotechnology Division International Rice Research Institute

Despite the great success achieved by the exploitation of heterosis in rice,the genetic basis of heterosis is still not well *** adopted an advanced-backcross breeding strategy to dissect the genetic basis of heterosis for yield and eight related *** testcross(TC) populations with 228 testcross F1 combinations were developed by crossing57 introgression lines with four types of widely used male sterile lines using a North Carolina II mating *** of variance indicated that the effects of testcross F1 combinations and their parents were significant or highly significant for most of the traits in both years,and all interaction effects with year were significant for most of the *** midparent heterosis(HMP) was observed for most traits in the four TC populations in the two *** relative HMPlevels for most traits varied from highly negative to highly ***-two dominant-effect QTL were identified for HMPof the nine traits in the four TC populations in the two *** these,22 QTL were also identified for the performance of testcross *** dominant-effect QTL could individually explain more than 10% of the phenotypic *** QTL clusters were observed including the region surrounding the RM9–RM297 region on chromosome 1,the RM110–RM279–RM8–RM5699–RM452 region on chromosome 2,the RM5463 locus on chromosome 6 and the RM1146–RM147 region on chromosome *** identified QTL for heterosis provide valuable information for dissecting the genetic basis of heterosis.

关键词： Rice Yield and related traits introgression lines Heterosis Quantitative trait loci

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Development of upland rice introgression lines and identification of QTLs for basal root thickness under different water regimes

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Journal of Genetics and Genomics 2011年第11期38卷 547-556页

作者： Junzhou Li Deping Wang Yan Xie Hongliang Zhang Guanglong Hu Jinjie Li Anyong Dai Lifeng Liu Zichao Li Key Laboratory of Crop Heterosis and Utilization （MOE） and Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100193 China College of Agriculture Henan Agricultural University Zhengzhou 450002China China National Centre for Biotechnology Development Beijing 100039 China

introgression lines （ILs） are valuable materials for identifying quantitative trait loci （QTLs）, evaluating genetic interactions, and marker assisted breeding. A set of 430 ILs （BC5F3） containing segments from upland tropical japonica cultivar IRAT109 in a lowland temperate japonica cultivar Yuefu background were developed. One hundred and seventy-six polymorphic markers were used to identify introgressed segments. No segment from IRAT109 was found in 160 lines. Introgressed segments of the other 270 lines covered 99.1% of the donor genome. The mean number of introgressed donor segments per individual was 3.3 with an average length of 14.4 cM. QTL analysis was conducted on basal root thickness （BRT） of the 270 ILs grown under irrigated lowland, upland and hydroponic conditions. A total of 22 QTLs affecting BRT were identified, six QTLs （qBRT3.1, qBRT3.2, qBRT6.1, qBRTS.2, qBRT9.1, and qBRT9.2） were consistently expressed under at least two environments （location and water regime）, and qBRT7.2 was a new BRT QTL identified under lowland conditions. IL255 containing qBRT9.1 showed an increase of 10.09% and 7.07% BRT over cultivar Yuefu when grown under upland and lowland conditions, respectively. Using a population of 304 F2：3 lines derived from the cross IL255 Yuefu, qBRT9.1 was validated and mapped to a 1.2 cM interval between RM24271 and RM566. The presence of qBRT9.1 explained 12% of BRT variation. The results provide upland rice ILs and BRT QTLs for analyzing the genetic basis of drought resistance, detecting favorable genes from upland rice, and rice drought resistance breeding.

关键词： Upland rice Quantitative trait loci introgression lines Basal root thickness

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Root and shoot traits responses to phosphorus deficiency and QTL analysis at seedling stage using introgression lines of rice

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Journal of Genetics and Genomics 2009年第3期36卷 173-183页

作者： Junzhou Li Yan Xie Anyong Dai Lifeng Liu Zichao Li Key Laboratory of Crop Genomics and Genetic Improvement of Ministry of Agriculture and Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100193 China

Phosphorous （P） deficiency is a major restraint factor for crop production and plants have developed several mechanisms to adapt to low P stress. In this study, a set of 271 introgression lines （ILs） were used to characterize the responses of seedlings to low P availability and to identify QTLs for root traits, biomass, and plant height under P-deficiency and P-sufficiency conditions. Plant height, total dry weight, shoot dry weight, and root number were inhibited under P-deficiency, whereas maximum root length （MRL） and root-shoot ratio （RS） were induced by P-deficiency stress. Relative MRL （RMRL, the ratio of MRL under P-deficiency to MRL under P-sufficiency con- dition） and relative RS （RRS） were used to evaluate P-deficiency tolerance at the seedling stage. A total of 24 additive QTLs and 29 pairs of epistatic QTLs were detected, but only qRN4 was detected in both conditions. This suggested that different mechanisms may exist in both P supply levels. QTLs for adaptive traits （RMRL, RRS, RRV, and RRDW） and qRN4 consistently expressed to increase trait stability may contribute to P-deficiency tolerance. Twelve intervals were cluster regions of QTLs for P-deficiency tolerance, and one QTL （qRRSS） showed pleiotropic effects on P-deficiency tolerance and drought tolerance. These interesting QTLs can be used in marker-assisted breeding through the target ILs.

关键词： introgression lines phosphorous deficiency tolerance QTL mapping rice root traits

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Preliminary Phenotypic and SNP-Based Molecular Characterization of Maize (Zea maysL.)-Mexicana (Zea maysSSP. Mexicana) introgression lines under Inbred Background of 48-2

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American Journal of Plant Sciences 2021年第7期12卷 1073-1089页

作者： Abdoul Raouf Sayadi Maazou Ju Qiu Ling Ai Mohammad G. Arabzai Mengya Qian Hameed Gul Xuemei Du Fangyu Xing Jiarui Yan Keyi Zhang Ziqi Zhang Qiannan Ma Tianhui Huang Hong Duan Qianlin Xiao Zhizhai Liu College of Agronomy and Biotechnology Southwest University Chongqing China Pan African University Life and Earth Sciences Institute (Including Health and Agriculture) University of Ibadan Ibadan Nigeria International Institute of Tropical Agriculture (IITA) Ibadan Nigeria Paktia University Gardiz Afghanistan

Wild relatives possess potential genetic diversity for maize (Zea mays L.) improvement. Characterization of maize-mexicana introgression lines (ILs) is of great value to diversify the genetic base and improve the maize germplasm. Four maize-mexicana IL generations, i.e. BC1, BC2, BC3, and RIL, were constructed under the elite inbred background of 48-2, elite inbred line that is widely used in maize breeding in Southwestern China, and were phenotyped in different years and genotyped with 56110 SNPs. The results indicated that 48-2 had higher phenotypic performances than all the characterized ILs on most of the agronomic traits. Compared with other ILs, BC2 individuals exhibited more similar performance to 48-2 on most traits and possessed the highest kernel ratio (66.5%). Population structure and principal component analysis indicated that BC3 individuals gathered closer to 48-2 and exhibited the lowest mexicana-introgression frequency (0.50%), while BC2 (29.06%) and RIL (18.52%) showed higher introgression frequency. The high level of genetic diversity observed in the maize-mexicana ILs demonstrated that Z. mays ssp. mexicana can serve as a potential source for the enri

关键词： Maize (Zea mays L.) Mexicana (Zea mays SSP. Mexicana) introgression lines Phenotypic Characterization Molecular Characterization

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QTL location for yield traits under two nitrogen conditions using selected introgression lines in rice

QTL location for yield traits under two nitrogen conditions ...

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第十四届全国植物基因组学大会

作者： Jing Zhang Jie Ren Chao Wang Junwei Zhang Yingyao Shi Yongming Gao Zhikang Li Institute of Crop Sciences Chinese Academy of Agricultural Sciences Anhui Agricultural University

Shuhui527(SH527) which was widely used elite indica restorer in China,was used as recurrent parent,2004 and TKM9 as donors for developing two BC2F4 selected backcrossing populations(SH527/2004,SH527/TKM9).Eight import... 详细信息

关键词： rice low nitrogen tolerance introgression lines yield QTL

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Genetic analysis of 1000-paddy grain weight using introgression lines

Genetic analysis of 1000-paddy grain weight using Introgress...

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2013全国植物生物学大会

作者： BIAN Jianmin HE Haohua SHI Huan ZHU Guoqiang ZHU Changlan PENG Xiaosong YU Qiuying HE Xiaopeng FU Junru CHEN Xiaorong HU Lifang OUYANG Linjuan College of Agronomy Jiangxi Agricultural University/Key Laboratory of Crop PhysiologyEcology and Genetic Breeding

Paddy grain weight is important component determining rice grain yield,and this trait is controlled by quantitative trait loci(QTL).To study the genetic basis of 1 000-paddy grain weight,quantitative genetic analysis was conducted in a population of 37 introgression lines(ILs) of indica elite variety Habataki in the background of japonica cuhivar Sasanishiki across two different environments(2011 Hainan and 2012 Nanchang).The results revealed that the trait investigated was affected by eleven QTL that individually explained 5.50%- 16.00%of the phenotypic *** of these QTL explained a modest proportion of the phenotypic variance,confirming that 1 000-paddy grain weight was inherited polygenically. Moreover,three QTL qPW3(between RM3766 and RM3513) on chromosome 3,qPW8 (between RM5767 and RM5891 ) on chromosome 8 and qPW11(between RM5824 and RM2191)on chromosome 11 were consistently detected across the both environments,whereas the remainder QTL were specific to one environment or the *** positive alleles for paddy grain weight came from Habataki for qPW8 and qPW11 except for *** introgression lines harboring the three major stable QTL represent a useful genetic resource for rice yield improvement via a design-breeding approach in the future.

关键词： quantitative trait loci(QTL) 1000-paddy grain weight introgression lines

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第十四届全国植物基因组学大会

作者： Yonghong Tao Jianlong Xu Institute of Crop Sciences National Key Facility for Crop Gene Resources and Genetic ImprovementChinese Academy of Agricultural Sciences

Rice(Oryza sativa L.) is a staple food for more than half of the world population, therefore increasing crop yield is one of the most important goals of plant science *** 496 introgression lines(ILs) derived from the ... 详细信息

关键词： quantitative trait loci gene×environment interaction introgression lines panicle length spikelets per panicle grains per panicle thousand-grain weight heading date yield pleiotropy

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Identification of quantitative trait loci for resistance to white-backed planthopper using introgression lines from Oryza minuta

Identification of quantitative trait loci for resistance to ...

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第十四届全国植物基因组学大会

作者： Sibin Guo Guoqing Gao Rice Research Institute Guangxi Academy of Agricultural Sciences

The whitebacked planthopper(WBPH),Sogatella furcifera Horvath,is one of the most serious sucking insect pest of rice,Oryza sativa *** this study,Quantitative trait loci(QTLs) for resistance to WBPH,were determined usi... 详细信息

关键词： whitebacked planthopper quantitative trait locus introgression lines Oryza minuta

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Analysis on Genomic Structure Changes and Diversity of introgression lines in Dongxiang Wild Rice(Oryza rufipogon Griff.)

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Agricultural Science & Technology 2012年第1期13卷 93-97页

作者：邓晓娟罗向东谢建坤万勇胡标林曹娟芳戴亮芳江西师范大学生命科学学院江西南昌330022 江西省农业科学水稻研究所江西省水稻生理及遗传重点实验室江西南昌330200

[Objective] The aim of the study was to make research on genomic struc- ture variation and variety analysis of Dongxiang wild rice. [Method] introgression groups of BC1F6 were based on donor of Oryza rufipogon Griff. and receptor of O. sativa sp. indica Kate. Strains of 239 in the group were analyzed on Polymor- phism with the help of 25 couples of SSR primers distributed in 12 pairs of chromo- somes. [Result] Gene fragments of O. rufipogon Griff. were found penetrated in the 25 microsatellite sites and most of the groups kept the parents of Xieqinzao B or DNA sequence of O. rufipogon Griff. The average rate of recurrent homozygous bands was 78.13% in the ILs, but the highest was 94.98% （amplified by primer RM131） and the lowest was 60.25% （RM171）. The average rate of donor homozy- gous bands was 13.37%, but the highest was 32.64% （RM171） and the lowest was 2.93% （RM1095）. There were numerous heterozygous sites in the population and the average heterozygosis rate was 5.62%, while the highest was 10.04%（RM401）. Moreover, we found some parental fragments were lost and some novel fragments were not detected in either parent in BC1F6 population. The average rate of lost bands was 2.88%, while the highest was 13.39% （RM311） and the lowest was 0 （RM401）. The average rate of new bands was 1%. The average of Nei＇s gene di- versity （He） and Shannon＇s Information index （I） were 0.276 and 0.457 respectively in high generation of introgression lines. [Conclusion] The study demonstrated that distant hybridization led to extensive genetic and epigenetic variations in high gener- ation of introgression lines, which expanded the base of genetic variation and laid an important foundation for rice improvement and germplasm innovation.

关键词： Oryza rufipogon Griff. introgression lines SSR analysis Genomic structure changes Genetic variation

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