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Resequencing-based QTL mapping for yield and resistance traits reveals great potential of oryza longistaminata in rice breeding

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The Crop Journal 2023年第5期11卷 1541-1549页

作者： Weixiong Long Nengwu Li Jie Jin Jie Wang Dong Dan Fengfeng Fan Zhiyong Gao Shaoqing Li State Key Laboratory of Hybrid Rice Key Laboratory for Research and Utilization of Heterosis in Indica Rice of Ministry of AgricultureEngineering Research Center for Plant Biotechnology and Germplasm Utilization of Ministry of EducationCollege of Life SciencesWuhan UniversityWuhan 430072HubeiChina Hongshan Laboratory of Hubei Province Wuhan 430072HubeiChina

As a natural genetic reservoir, wild rice contains many favorable alleles and mutations conferring high yield and resistance to biotic and abiotic stresses. However, there are few reports describing favorable genes or QTL from the AA genome wild rice O. longistaminata, which is characterized by tall and robust habit and long tassels and anthers and shows high potential for use in cultivated rice improvement. We constructed a stable BC_(2)F_(20) backcross inbred line(BIL) population of 152 lines from the cross of 9311 × ***. Some BILs showed large panicles, large seeds, and strong resistance to rice false smut, bacterial leaf blight, rice blast spot, and brown planthopper. Genomic resequencing showed that the 152 BILs covered about 99.6% of the O. longistaminata genome. QTL mapping with 2432 bin markers revealed 13QTL associated with seven yield traits and eight with resistance to brown planthopper and to four diseases. Of these QTL, 12 for grain yield and 11 for pest and disease resistance are novel in oryza species.A large-panicle NIL1880 line containing QTL qPB8.1 showed a nearly 50% increase in spikelet number and27.5% in grain yield compared to the recurrent parent 9311. These findings support the potential value of O. longistaminata for cultivated rice improvement.

关键词： oryza longistaminata High yield High disease and pest resistance QTL

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Quantitative Trait Locus Mapping of High Photosynthetic Efficiency and Biomass in oryza longistaminata

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Rice science 2022年第6期29卷 569-576,I0034,I0035页

作者： SI Fengfeng FAN Fengfeng WEI Xiao HE Shihao LI Xianlong PENG Xiaojue LI Shaoqing State Key Laboratory of Hybrid Rice/Hongshan Laboratory of Hubei Province/Key Laboratory for Research and Utilization of Heterosis in indica Rice of Ministry of Agriculture and Rural Affairs/Engineering Research Center for Plant Biotechnology and Germplasm Utilization of Ministry of Education/College of Life Science Wuhan UniversityWuhan 430072China Key Laboratory of Molecular Biology and Gene Engineering of Jiangxi Province/College of Life Science Nanchang UniversityNanchang 330031China

Photosynthetic efficiency,a key trait that determines yield potential in rice,is quantitatively regulated by multiple *** of valuable genetic resources hidden in wild rice is an effective way to improve rice photosynthesis and yield *** this study,152 backcross inbred lines derived from wild rice oryza longistaminata were explored for QTL mapping of photosynthetic rate(Pn)and biomass(BM)in natural *** novel QTLs for Pn and seven QTLs for BM or daily biomass(DBM)derived from *** were *** of these QTLs,qPn8.1,could significantly improve Pn and was located in a 68-kb region containing only 11 candidate ***,qBM1.1 and qDBM1.1 for BM and DBM on chromosome 1 were overlapped with qPn1.1 for Pn from 9311,and could affect both Pn and BM in natural *** QTLs identified in *** may provide a novel alternative to explore new genes and resources for yield potentiality,highlighting the important role of wild rice in rice breeding programs.

关键词： QTL oryza longistaminata photosynthetic rate biomass wild rice

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Novel QTLs from Wild Rice oryza longistaminata Confer Strong Tolerance to High Temperature at Seedling Stage

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Rice science 2023年第6期30卷 577-586页

作者： FAN Fengfeng CAI Meng LUO Xiong LIU Manman YUAN Huanran CHENG Mingxing Ayaz AHMAD LI Nengwu LI Shaoqing State Key Laboratory of Hybrid Rice Key Laboratory for Research and Utilization of Heterosis in Indica Rice of Ministry of Agriculture and Rural AffairsEngineering Research Center for Plant Biotechnology and Germplasm Utilization of Ministry of EducationCollege of Life ScienceWuhan UniversityWuhan 430072China Hubei Hongshan Laboratory Wuhan 430072China

Global warming poses a threat to rice *** heat-tolerant rice is an effective and economical approach to address this *** rice is a valuable genetic resource for developing heat-tolerant crops due to its intricate mechanism for adapting to high *** longistaminata,a widely distributed wild rice species in Africa,may harbor an even richer gene pool for heat tolerance,which remains *** this study,we identified three heat tolerance QTLs from *** at the seedling stage,including novel heat tolerance loci qTT4 and *** findings demonstrated that the *** alleles for these two QTLs can enhance the heat tolerance of rice ***,qTT5 was mapped to a region spanning approximately 287.2 kb,which contains 46 expressing *** the analysis of Gene Ontology and expression differences under heat induction,we identified four candidate *** results lay the foundation for discovering heat tolerance genes underlying *** and developing new genetic resources for heat-tolerant rice breeding.

关键词： wild rice oryza longistaminata heat tolerance QTL

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Improvement of Wild Rice oryza longistaminata through Mutation Induction

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Journal of Food Science and Engineering 2016年第2期6卷 82-89页

作者： Fousseyni Cisse Medoune Papa Khouma Institut d 'Economie Rurale (IER) Centre Regional de la Recherche Agronomique (CRRA) Sikasso BP. 16 Mall

Influence of a mutation to improve the undesirable traits （shattering, red caryopsis etc.） of wild rice O. longistaminata while preserving its useful genes by radiation 20 Kr gamma rays from 60Co was studied. The mutants issued this irradiation were crossed with the interspecific variety SIK385-b-42-28-28 （O. glaberrima x O. sativa）. Irradiation followed by crossing with interspecific variety generated a large genetic variability, in the subsequent generations, in plant height, maturity, non-shattering grain, kernel colour, spikelets fertility, panicle length, and grain size. This has resulted in identification of promising mutants which possess all the traits of cultivated rice O. sativa （white kernel, non-shattering grain, secondary branchies etc.）. During 2012 rainy season, nineteen selected mutants from M5 and M7 generations were evaluated for yield potential in replicated trials at Longorola station.

关键词： Wild rice oryza longistaminata mutagenesis mutants.

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Genetic analysis of a hybrid sterility gene that causes both pollen and embryo sac sterility in hybrids between oryza sativa L. and oryza longistaminata

Genetic analysis of a hybrid sterility gene that causes both...

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江苏省遗传学会2017年学术研讨会——“技术创新与遗传学发展”

作者：陈海元 Zhigang Zhao Linglong Liu Weiyi Kong Yun Lin Shimin You Wenting Bai Yanjia Xiao Hai Zheng Ling Jiang Jing Li Jiawu Zhou Dayun Tao Jianmin Wan Nanjing Agricultural University Yunnan Academy of Agricultural Sciences Chinese Academy of Agricultural Sciences

oryza longistaminata originates from African wild rice and contains valuable traits conferring tolerance to biotic and abiotic stress. However, interspecific crosses between O. longistaminata and O. sativa cultivars are hindered by reproductive barriers. To dissect the mechanism of interspecific hybrid sterility, we developed a near-isogenic line(NIL) using indica variety RD23 as the recipient parent and O. longistaminata as the donor parent. Both pollen and embryo sac semi-sterility were observed in F1 hybrids between RD23 and NIL. Cytological analysis demonstrated that pollen abortion in F1 hybrids occurred at the early binucleate stage due to a failure of the first mitosis in microspores. Partial embryo sacs in the F1 hybrids were defective during the functional megaspore formation stage. Most notably, nearly half of the male or female gametes were aborted in heterozygotes S40 iS40 l, regardless of their genotypes. Thus, S40 was indicated as a one-locus sporophytic sterility gene controlling both male and female fertility in hybrids between RD23 and oryza longistaminata. A population of 16,802 plants derived from the hybrid RD23/NIL-S40 was developed to fine-map S40. Finally, the S40 locus was delimited to an 80-kb region on the short arm of chromosome 1 in terms with reference sequences of cv. 93-11. Eight open reading frames(ORFs) were localized in this region. Based on gene expression and genomic sequence analysis, ORF5 and ORF8 were identified as candidate genes for the S40 locus. These results are helpful in cloning the S40 gene and marker-assisted transferring of the corresponding neutral allele in rice breeding programs.

关键词： oryza longistaminata Reproductive isolation Gamete abortion Cytological abnormality Genetic mechanisms

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Genome and comparative transcriptomics of African wild rice oryza longistaminata provide insights into molecular mechanism of rhizomatousness and self-incompatibility

Genome and comparative transcriptomics of African wild rice ...

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2016年全国植物生物学大会

作者： Yesheng Zhang Wen Wang Fengyi Hu State Key Laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of Sciences Food Crops Research Institute Yunnan Academy of Agricultural Sciences

oryza longistaminata is a close wild relative of the African cultivated rice and has several hallmark biological traits,such as rhizomatousness,self-incompatibility and high resistances to biotic and abiotic stresses. Deciphering genome of O. longistaminata has been hindered by the high heterozygosity of this species,which is a result of its inherent self-incompatibility. Here,we present the reference genome of O. longistaminata based on a large quantity of combined sequencing data(96× Illumina short reads and .9× Roche GS FLX+ long reads) and compared genomics revealed more resistance(R) genes/families. By comparing transcriptomes of 4 pairs of tissues related to the presence/absence of rhizomes or self-incompatibility,we identified candidate genes related to rhizomatousness and self-incompatibility. In aggregate,the draft genome and large quantity of transcriptome data of O. longistaminata provide a basic evidentiary foundation for targeted studies into the genes underlying its valuable phenotypic traits,future gene mining or breeding efforts,and further study into the evolution of African rice and the oryza genus.

关键词： oryza longistaminata genome rhizomatousness self-incompatability

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Identification and characterization of miRNA transcriptome in rhizome of oryza longistaminata by high-throughput sequencing

Identification and characterization of miRNA transcriptome i...

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第十四届全国植物基因组学大会

作者： Ying Zong Ting Zhang Liyu Hang Wensheng Wang Binying Fu Institute of Crop Sciences Chinese Academy of Agricultural Sciences

In plants,endogenous small RNAs,including microRNAs(miRNAs) and trans-acting small interfering RNAs play an important role in biological processes such as development and stress *** the diverse functions of miRNAs in ... 详细信息

关键词： oryza longistaminata deep sequencing miRNA Northern blot 5’RACE

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