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Simultaneous production of high-frequency synthetic apomixis with high fertility and improved agronomic traits in hybrid rice

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Molecular Plant 2024年第1期17卷 4-7页

作者： Mengqiu Song Wumei Wang Chun Ji Shengnan Li Wei Liu Xiaoyu Hul Anhui Feng Shuang Ruan Shiyun Du Huan Wang Kui Dai Longbiao Guo Qian Qian Hongqi Si Xingming Hu College of Agronomy Anhui Agricultural UniversityHefeiAnhui 230036China State key laboratory of rice Biology China National Rice Research InstituteHangzhouZhejiang 310006China rice research Institute Anhui Academy of Agricultural SciencesHefeiAnhui 230031China Jiangxi Modern Seed Industry Co.NanchangJiangxi 330026China

Dear Editor,utilization of heterosis is fundamental to modern agricultural improvement and contributes significantly to food security and agricultural development(Ouyang et al.,2022).However,heterosis of F,hybrids cannot be stably ***,or asexual reproduction through seeds,offers the potential for the fixation of heterosis in F,hybrids and the formation of clonal offspring,which could have considerable implications for plant breeding and agriculture(Schmidt,2020).But naturally occurring apomixis has never been found in major ***,synthetic apomixis has been successfully generated by inducing incomplete meiotic development combined with parthenogenesis development to produce cloned rice(Oryza sativa)seeds(Khanday et al.,2019;Wang et al.,2019;Vernet et al.,2022;Wei et al.,2023).

关键词： sativa fertility breeding

Genetic and molecular mechanisms of reproductive isolation in the utilization of heterosis for breeding hybrid rice

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Journal of Genetics and Genomics 2024年第6期51卷 583-593页

作者： Chaolong Wang Xiaowen Yu Jian Wang Zhigang Zhao Jianmin Wan State key laboratory for Crop Genetics&Germplasm Enhancement and Utlization Nanjing Agricultural UniversityZhongshan Biological Breeding LaboratoryNanjingJiangsu210095China State key laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

heterosis,also known as hybrid vigor,is commonly observed in rice *** hybridization of rice species or subspecies exhibits robust hybrid vigor,however,the direct harnessing of this vigor is hindered by reproductive ***,we review recent advances in the understanding of the molecular mechanisms governing reproductive isolation in inter-subspecific and inter-specific *** review encompasses the genetic model of reproductive isolation within and among Oryza sativa species,emphasizing the essential role of mitochondria in this ***,we delve into the molecular intricacies governing the interaction between mitochondria and autophagosomes,elucidating their significant contribution to reproductive ***,our exploration extends to comprehending the evolutionary dynamics of reproductive isolation and speciation in *** on these advances,we offer a forward-looking perspective on how to overcome the challenges of reproductive isolation and facilitate the utilization of heterosis in future hybrid rice breeding endeavors.

关键词： Hybrid vigor Reproductive isolation Hybrid ricebreeding

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

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

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作物学报:英文版 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

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

A genetic linkage map with 178 SSR and 1901 SNP markers constructed using a RIL population in wheat (Triticum aestivum L.)

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Journal of Integrative Agriculture 2015年第9期14卷 1697-1705页

作者： ZHAI Hui-jie FENG Zhi-yu LIU Xin-ye CHENG Xue-jiao PENG Hui-ru YAO Ying-yin SUN Qi-xin NI Zhong-fu State key laboratory for Agrobiotechnology/key laboratory of Crop heterosis and utilization Ministry of Education/Key Laboratory ofCropGenomicsandGeneticImprovementMinistryofAgriculture/BeijingKeyLaboratoryofCropGeneticImprovementNational Plant Gene Research Centre (Beijing)China Agricultural University

The construction of high density genetic linkage map provides a powerful tool to detect and map quantitative trait loci(QTLs) controlling agronomically important traits. In this study, simple sequence repeat(SSR) markers and Illumina 9K i Select single nucleotide polymorphism(SNP) genechip were employed to construct one genetic linkage map of common wheat(Triticum aestivum L.) using 191 recombinant inbred lines(RILs) derived from cross Yu 8679×Jing 411. This map included 1 901 SNP loci and 178 SSR loci, covering 1 659.9 c M and 1 000 marker bins, with an average interval distance of 1.66 c M. A, B and D genomes covered 719.1, 703.5 and 237.3 c M, with an average interval distance of 1.66, 1.45 and 2.9 c M, respectively. Notably, the genetic linkage map covered 20 chromosomes, with the exception of chromosome 5D. Bioinformatics analysis revealed that 1 754(92.27%) of 1 901 mapped SNP loci could be aligned to 1 215 distinct wheat unigenes, among which 1 184(97.4%) were located on o ne single chromosome, and the rest 31(2.6%) were located on 2 to 3 chromosomes. By performing in silico comparison, 214 chromosome deletion bin-mapped expressed sequence tags(ESTs), 1 043 Brachypodium genes and 1 033 rice genes were further added onto the genetic linkage map. This map not only integrated genetic and physical maps, SSR and SNP loci, respectively, but also provided the information of Brachypodium and rice genes corresponding to 1 754 SNP loci. Therefore, it will be a useful tool for comparative genomics analysis, fine mapping of QTL/gene controlling agronomically important traits and marker-assisted selection breeding in wheat.

关键词： wheat genetic linkage map SNP SSR unigene deletion bin-mapped ESTs

A Set of SCAR Markers Efficiently Differentiating Hybrid rice

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rice science 2012年第1期19卷 14-20页

作者： LI Shu-jing XIE Hong-wei QIAN Ming-juan CHEN Guang-hui LI Shao-qing ZHU Ying-guo State key laboratory of Hybrid rice key laboratory for research and utilization of heterosis in lndica rice Ministry of Agriculture Engineering research Center for Plant Biotechology and Germplasm utilization of Ministry of Education College of Life Sciences Wuhan University Wuhan 430072 China Bangbu Medical College Bangbu 233030 China College of Plant Science Hunan Agricultural University Changsha 410128 China

Molecular markers have been widely used in crop genetic improvement, seed test and genetic mapping. Of which, sequence characterized amplified region （SCAR） markers are particularly popular for its diversity, stable reproducibility, and suitability for analyzing large number of samples. In this study, 500 random amplified polymorphic DNA （RAPD） primers were tested, and a set of SCAR markers comprising 37 pairs of loci-specific primers were developed from the DNA fragments ranging from 300 to 1000 bp which correspond to the stable, distinctive RAPD banding patterns. Using these SCAR markers, 59 hybrid rice combinations were assessed and distinguished into 58 subgroups at the similarity coefficient of 0.97 in a genetic clustering tree based on the allele diversities of the SCAR markers. Furthermore, 13 hybrid rice combinations were reassayed with 40 randomly selected simple sequence repeat （SSR） markers to evaluate the effectiveness of these SCAR markers. SSR markers produced similar results to SCAR markers as the 13 hybrid rice combinations were completely separated at the similarity coefficient of 0.91 in the clustering tree established from SSR patterns. Taken together, SCAR markers prove to be effective tools for identifying and differentiating hybrid rice combinations.

关键词： hybrid rice molecular marker sequence characterized amplified region variety identification

OsCBL1 Modulates Lateral Root Elongation in rice via Affecting Endogenous Indole-3-Acetic Acid Biosynthesis

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Journal of Genetics and Genomics 2015年第6期42卷 331-334页

作者： Jing Yang Xiaomu Zhang Yunqing Huang Yuqi Feng Yangsheng Li State key laboratory of Hybrid rice College of Life SciencesWuhan University key laboratory for research and utilization of heterosis in Indica Ricae Ministry of Agriculture key laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education) Department of ChemistryWuhan University

Root growth is important for plants to efficiently acquire water and mineral nutrients from soil. Root system architecture （RSA）, which is determined mainly by root branching through lateral root formation and root angles, has a significant influ- ence on root growth. Generally, the growth and development of roots are regulated by numerous plant hormones, which respond to external environmental stimulation through com- plex signal transduction pathways.

关键词： CBL root CIPK IAA

LHD1,an Allele of DTH8/Ghd8,Controls Late Heading Date in Common Wild rice (Oryza rufipogon)

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Journal of Integrative Plant Biology 2012年第10期54卷 790-799页

作者： Xiaodong Dai Younian Ding Lubin Tan Yongcai Fu Fengxia Liu Zuofeng Zhu Xianyou Sun Xuewen Sun Ping Gu Hongwei Cai Chuanqing Sun State key laboratory of Plant Physiology and Biochemistry National Evaluation Centre for Agricultural Wild Plants(Rice)Laboratory ofCrop Heterosis and Utilization of the Ministry of EducationBeijing Key Laboratory of Crop Genetic ImprovementDepartment of PlantGenetics and BreedingChina Agricultural UniversityBeijing 100193China

Flowering at suitable time is very important for plants to adapt to complicated environments and produce their seeds successfully for reproduction. In rice （Oryza rufipogon Griff.） photoperiod regulation is one of the important factors for controlling heading date. Common wild rice, the ancestor of cultivated rice, exhibits a late heading date and a more sensitive photoperiodic response than cultivated rice. Here, through map-based cloning, we identified a major quantitative trait loci （QTL） LHD1 （Late Heading Date 1）, an allele of DTH8/Ghd8, which controls the late heading date of wild rice and encodes a putative HAP3/NF-YB/CBF-A subunit of the CCAAT-box-binding transcription factor. Sequence analysis revealed that several variants in the coding region of LHD1 were correlated with a late heading date, and a further complementary study successfully rescued the phenotype. These results suggest that a functional site for LHD1 could be among those variants present in the coding region. We also found that LHD1 could down-regulate the expression of several floral transition activators such as Ehdl, Hd3a and RFT1 under long-day conditions, but not under short-day conditions. This indicates that LHD1 may delay flowering by repressing the expression of Ehdl, Hd3a and RFT1 under long-day conditions.

关键词： rice LHD1 heading date CCAAT-box-binding transcription factor.