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Classification and Identification of indica P/TGMS Lines in China

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Rice science 2019年第3期26卷 195-198页

作者： ZHANG Mengchen WANG Shan YAN Jianfang SUN Shuiyong XU Xin XU Qun YUAN Xiaoping WEI Xinghua yang yaolong State Key Laboratory of Rice Biology China National Rice Research Institute Seeds Administration Center of Zhejiang Province

Despite extensive studies on cultivated rice, the population structure and genetic diversity of the indica photoperiod-and thermo-sensitive genic male sterility(P/TGMS) lines in China remains unclear. Using 48 simple sequence repeat(SSR) markers, we genotyped a panel of 208 indica P/TGMS lines and confirmed three subgroups, named indica-I, indica-II and indica-III, in indica P/TGMS lines. Further diversity analysis indicated indica-II had the highest genetic diversity. The genetic differentiation between indica-II and indica-III was demonstrated as the largest among the three subgroups. Moreover, indica/japonica component identification was detected that five P/TGMS lines possess indica components less than 0.900. These results improve our knowledge on the genetic background for P/TGMS lines in China and will be beneficial for hybrid rice breeding programs.

关键词： Classification Identification Despite

Molecular Evolution of Rice Blast Resistance Gene bsr-d1

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Rice science 2024年第6期31卷 700-711页

作者： LI Wei ZHANG Mengchen yang yaolong WENG Lin HU Peisong WEI Xinghua Research Institute of Life Sciences Computing Zhejiang LabHangzhou 310012China State key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China National Nanfan Research Institute(Sanya) Chinese Academy of Agricultural SciencesSanya 572024China

Rice blast,caused by the fungus Magnaporthe oryzae,reduces rice yields by 10%to 35%.Incorporating blast resistance genes into breeding programs is an effective strategy to combat this *** the genetic variants that confer resistance is crucial to this *** gene Bsr-d1 encodes a C2H2-like transcription factor,and its recessive allele confers broad-spectrum resistance against infections by various strains of *** this study,we investigated the molecular evolution of the rice blast resistance gene bsr-d1 in a representative population consisting of 827 cultivated and wild rice *** results revealed that wild rice exhibited significantly higher nucleotide diversity,with polymorphic regions primarily concentrated in the promoter region,in contrast to indica and japonica rice *** Bsr-d1 gene displayed significant differentiation between indica and japonica rice varieties,with the bsr-d1 resistance allele being unique to indica *** network and phylogenetic analyses suggested that the bsr-d1 resistance allele most likely originated from Oryza nivara in the region adjacent to the Indian Peninsula and the Indochina ***,we explored the utilization of bsr-d1 resistance alleles in China and designed a pair of DNA primers based on the polymorphic sites for the detection of the bsr-d1 resistance *** summary,our study uncovering the origin and evolution of bsr-d1 will enhance our understanding of resistance gene variation and expedite the resistance breeding process.

关键词： broad-spectrum resistance bsr-d1 gene evolution Magnaporthe oryzae resistance breeding

Identification of the BTA8 gene reveals the contribution of natural variation to tiller angle in rice

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Journal of Integrative Agriculture 2024年第8期23卷 2868-2871页

作者： Junrong Liu Xingyu Wang Jing Wang Junhua Ye Mengchen Zhang Qun Xu yaolong yang Xinghua Wei Baoyan Jia Yue Feng State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China College of Agronomy Shenyang Agricultural UniversityShenyang 110866China National Nanfan Research Institute(Sanya) Chinese Academy of Agricultural SciencesSanya 572024China

Plant architecture is a collection of major agronomic traits that determines rice grain production,and it is mainly influenced by tillering,tiller angle,plant height and panicle morphology(Wang and Li 2006).Tiller angle is one of the critical components that determines rice plant architecture,which in turn influences grain yield mainly due to its large impact on plant density(Wang et al.2022).

关键词： angle panicle agronomic

BTA2 regulates tiller angle and the shoot gravity response through controlling auxin content and distribution in rice

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Journal of Integrative Plant Biology 2024年第9期66卷 1966-1982页

作者： Zhen Li Junhua Ye Qiaoling Yuan Mengchen Zhang Xingyu Wang Jing Wang Tianyi Wang Hongge Qian Xinghua Wei yaolong yang Lianguang Shang Yue Feng China National Center for Rice Improvement State Key Laboratory of Rice Biology and BreedingChina National Rice Research InstituteHangzhou 310006China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518124China National Nanfan Research Institute(Sanya) Chinese Academy of Agricultural SciencesSanya 572024China

Tiller angle is a key agricultural trait that establishes plant architecture,which in turn strongly affects grain yield by influencing planting density in *** shoot gravity response plays a crucial role in the regulation of tiller angle in rice,but the underlying molecular mechanism is largely ***,we report the identification of the BIG TILLER ANGLE2(BTA2),which regulates tiller angle by controlling the shoot gravity response in ***-of-function mutation of BTA2 dramatically reduced auxin content and affected auxin distribution in rice shoot base,leading to impaired gravitropism and therefore a big tiller ***2 interacted with AUXIN RESPONSE FACTOR7(ARF7)to modulate rice tiller angle through the gravity signaling *** BTA2 protein was highly conserved during *** variation in the BTA2 promoter of indica cultivars harboring a less expressed BTA2 allele caused lower BTA2 expression in shoot base and thus wide tiller angle during rice *** of BTA2 significantly increased grain yield in the elite rice cultivar Huanghuazhan under appropriate dense planting *** findings thus uncovered the BTA2-ARF7 module that regulates tiller angle by mediating the shoot gravity *** work offers a target for genetic manipulation of plant architecture and valuable information for crop improvement by producing the ideal plant type.

关键词： auxin domestication gravity response rice tiller angle

Brittle culm 25, which encodes an UDP-xylose synthase, affects cell wall properties in rice

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The Crop Journal 2023年第3期11卷 733-743页

作者： Siliang Xu Mengchen Zhang Junhua Ye Dongxiu Hu Yuanyuan Zhang Zhen Li Junrong Liu Yanfei Sun Shan Wang Xiaoping Yuan Yue Feng Qun Xu Xinghua Wei Dali Zeng yaolong yang China National Center for Rice Improvement/State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006ZhejiangChina The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province Zhejiang A&F UniversityHangzhou 311300ZhejiangChina

Because plant mechanical strength influences plant growth and development,the regulatory mechanisms underlying cell-wall synthesis deserve *** mutants are useful for such *** have identified a novel brittle culm 25(bc25)mutant with reduced growth and partial ***25 encodes an UDP-glucuronic acid decarboxylase involved in cellulose synthesis and belongs to the UXS family.A single-nucleotide mutation in BC25 accounts for its altered cell morphology and cellwall *** electron microscopy analysis showed that the thickness of the secondary cell wall was reduced in *** analysis revealed significant increases in content of rhamnose and arabinose but not of other monosaccharides,indicating that BC25 was involved in xylose synthesis with some level of functional *** assays suggested that BC25 functions with high activity to interconvert UDP-glucuronic acid(UDP-Glc A)and *** staining showed that BC25 was ubiquitously expressed with higher expression in culm,root and sheath,in agreement with that shown by quantitative real-time(q RT)-***-seq further suggested that BC25 is involved in sugar *** conclude that BC25 strongly influences rice cell wall formation.

关键词： Brittle culm Mechanical strength UDP-xylose Cell wall Rice

A KNOX II transcription factor suppresses the NLR immune receptor BRG8-mediated immunity in rice

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Plant Communications 2024年第10期5卷 121-138页

作者： Siliang Xu Xinghua Wei Qinqin yang Dongxiu Hu Yuanyuan Zhang Xiaoping Yuan Fengyu Kang Zhaozhong Wu Zhiqin Yan Xueqin Luo Yanfei Sun Shan Wang Yue Feng Qun Xu Mengchen Zhang yaolong yang China National Center for Rice Improvement/State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China National Nanfan Research Institute(Sanya) Chinese Academy of Agricultural SciencesSanya 572024China

Nucleotide-binding site and leucine-rich repeat(NLR)proteins are activated by detecting pathogen effectors,which in turn trigger host defenses and cell *** many NLRs have been identified,the mechanisms responsible for NLR-triggered defense responses are still poorly *** this study,through a genome-wide association study approach,we identified a novel NLR gene,Blast Resistance Gene 8(BRG8),which confers resistance to rice blast and bacterial blight ***8 overexpression and complementation lines exhibit enhanced resistance to both *** localization assays showed that BRG8 is localized in both the cytoplasm and the *** evidence revealed that nuclear-localized BRG8 can enhance rice immunity without a hypersensitive response(HR)-like *** also demonstrated that the coiled-coil domain of BRG8 not only physically interacts with itself but also interacts with the KNOX II protein HOMEOBOX ORYZA SATIVA59(HOS59).Knockout mutants of HOS59 in the BRG8 background show enhanced resistance to Magnaporthe oryzae strain CH171 and Xoo strain CR4,similar to that of the BRG8 *** contrast,overexpression of HOS59 in the BRG8 background will compromise the HR-like phenotype and resistance *** analysis revealed that HOS59 promotes the degradation of BRG8 via the 26S proteasome ***,our study highlights HOS59 as an NLR immune regulator that fine-tunes BRG8-mediated immune responses against pathogens,providing new insights into NLR associations and functions in plant immunity.

关键词： rice NLR protein KNOX II protein rice blast bacterial blight

Characterization and fine mapping of an early senescence mutant (es-t) in Oryza sativa L.

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Chinese Science Bulletin 2011年第23期56卷 2437-2443页

作者： yang yaolong RAO YuChun LIU HuiJuan FANG YunXia DONG GuoJun HUANG LiChao LENG YuJia GUO LonBiao ZHANG GuangHeng HU Jiang GAO ZhenYu QIAN Qian ZENG DaLi State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China College of Life and Environment Sciences Hangzhou Normal University Hangzhou 310036 China

An es-t (early senescence-temporary) mutant, produced by ethylene methylsulfonate treatment of strain Nipponbare, was identified in rice. The leaves of es-t appeared yellow at the seedling stage, and had decreased chlorophyll content. Rust spots were found during growth in es-t, especially at the leaf margin and tip. The plants showed a typical early-senescence phenotype at the milky stage. The leaf surface of es-t appeared smoother than wild-type leaves under a scanning electron microscope, because the leaves lack siliceous protuberances around the stoma. Chloroplasts grow abnormally and are filled with many starch grains in es-t. Paraffin section analysis showed that the development of the sclerenchyma cells and vascular bundles were also abnormal in es-t. Genetic analysis indicated that es-t was controlled by a recessive gene, which was finely mapped to a 42-kb interval on chromosome 5. These results will facilitate the positional cloning and functional studies of the gene.

关键词： ES 衰老早期精细定位突变水稻扫描电子显微镜表征

Simulation of Head-Disk Collisions in Magnetic Disk Drives

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Journal of Systems Engineering and Electronics 1994年第4期5卷 26-32页

作者： Zhu yaolong, Zhou Xueren, and yang YinpuBeijing Institute of Data Processing Technology P.O.Box: 3927, Beijing 100854, P.R.China Beijing Institute of Data Processing Technology P.O. Box: 3927 Beijing 100854 P.R. China

Head disk collision models of 'coefficient-of-restitution' are widely used in the head disk interface simulation. A new head disk collision model called 'critical velocity model' has been developed. Numerical simulation of dynamics of a typical Winchester-type slider is presented under the influence of head disk collisions due to disk surface defects such as localize asperities. Two kinds of head disk collision models have been compared and analysed. The results show that the critical velocity is a very important parameter which affects the dynamics of the slider.

关键词： Magnetic disks Tribology Collision Hydrodynamics.

Genetic Variation Dissection of Rice Blast Resistance Using an Indica Population

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Rice science 2020年第4期27卷 255-258页

作者： ZHANG Mengchen WEI Zhonghua YUAN Xiaoping WANG Caihong WANG Shan NIU Xiaojun XU Xin XU Qun FENG Yue YU Hanyong WANG Yiping ZHU Zhiwei ZHAI Rongrong yang yaolong WEI Xinghua State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China Suihua Branch of Heilongjiang Academy of Agricultural Sciences Suihua 152000China Institute of Crop and Nuclear Technology Utilization Zhejiang Academy of Agricultural SciencesHangzhou 310021China

Rice blast disease,caused by fungus pathogen Magnaporthe oryzae,is one of the most destructive diseases that impact rice *** the worldwide,rice harvests lose 10%to 30%of the total production because of blast infection... 详细信息

关键词： Population enough farming