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A 48-bp deletion upstream of LIGULELESS 1 alters rice panicle architecture

The Crop Journal 2024年第2期12卷 354-363页

作者： Linhua Wu Min Hu Shuwei Lyu Wenfeng Chen Hang Yu Qing Liu Wei He Chen Li zuofeng zhu Rice Research Institute Guangdong Academy of Agricultural SciencesGuangzhou 510640GuangdongChina National Center for Evaluation of Agricultural Wild Plants(Rice) Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China State Key Laboratory for Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006ZhejiangChina Key Laboratory of Genetics and Breeding of High Quality Rice in Southern China(Co-construction by Ministry and Province) Ministry of Agriculture and Rural AffairsGuangzhou 510640GuangdongChina Guangdong Key Laboratory of New Technology in Rice Breeding Guangzhou 510640GuangdongChina Guangdong Rice Engineering Laboratory Guangzhou 510640GuangdongChina

Panicle architecture is an agronomic determinant of crop yield and a target for cereal crop *** investigate its molecular mechanisms in rice,we performed map-based cloning and characterization of OPEN PANICLE 1(OP1),a gain-of-function allele of LIGULELESS 1(LG1),controlling the spread-panicle *** allele results from a 48-bp deletion in the LG1 upstream region and promotes pulvinus development at the base of the primary *** OP1 expression and altered panicle phenotype in chimeric transgenic plants and upstream-region knockout mutants indicated that the deletion regulates spread-panicle architecture in the mutant spread panicle 1(sp1).Knocking out BRASSINOSTEROID UPREGULATED1(BU1)gene in the background of OP1 complementary plants resulted in compact panicles,suggesting OP1 may regulate inflorescence architecture via the brassinosteroid signaling *** regard that manipulating the upstream regulatory region of OP1 or genes involved in BR signal pathway could be an efficient way to improve rice inflorescence architecture.

关键词： Upstream region Panicle architecture Gene expression BR Rice

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Haploids can be induced in knockout mutants of OsPLA1,but not OsDMP3 or OsDMP6,in rice

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The Crop Journal 2024年第1期12卷 213-221页

作者： Zongkai Liu Yu Zhong Xiaolong Qi Tai An Shuwei Guo Dong Wang Yuwen Wang Bin Feng zuofeng zhu Shaojiang Chen Chenxu Liu National Maize Improvement Center Engineering Research Center of Ministry of EducationChina Agricultural UniversityBeijing 100193China National Center for Evaluation of Agricultural Wild Plants(Rice) Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China

Doubled haploid(DH)technology is an important tool in crop breeding because it can significantly accelerate the breeding ***1/MATL/NLD and ZmDMP are two key genes controlling haploid induction(HI)in maize,exhibiting a synergistic ***,it is unknown whether knock out of ZmDMP orthologs can stimulate HI in *** this study,a ZmPLA1 ortholog(OsPLA1)and two ZmDMP orthologs(OsDMP3 and OsDMP6)were identified in *** three genes encode plasma membrane-localized proteins and were highly expressed in mature *** of OsPLA1 in both Minghui 63 and Nipponbare resulted in reduced seed setting rate(SSR)and caused *** osdmp3,osdmp6 and the double mutant failed to trigger HI independently,nor increased the haploid induction rate(HIR)when combined with *** pollinations operations of QX654A with the ospla1 mutant significantly improve SSR,while reducing ***-seq profiling of mature ospla1 mutant anthers indicated that a large number of differentially expressed genes(DEGs)were enriched in redox homeostasis and lipid metabolic GO terms,plant hormone signal transduction,and MAPK signaling *** findings provide important insights towards construction of an efficient DH breeding technology and study of the molecular mechanism of HI in rice.

关键词： Doubled haploid breeding Haploid induction Mutation anlaysis Rice

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Polyamine oxidase 3 is involved in salt tolerance at the germination stage in rice

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Journal of Genetics and Genomics 2022年第5期49卷 458-468页

作者： Guangyu Liu Wanxia Jiang Lei Tian Yongcai Fu Lubin Tan zuofeng zhu Chuanqing Sun Fengxia Liu State Key Laboratory of Plant Physiology and Biochemistry China Agricultural UniversityBeijing 100193China National Center for Evaluation of Agricultural Wild Plants(Rice) Beijing Key Laboratory of Crop Genetic ImprovementLaboratory of Crop Heterosis and UtilizationMOEDepartment of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China

Soil salinity inhibits seed germination and reduces seedling survival rate,resulting in significant yield reductions in ***,we report the identification of a polyamine oxidase,OsPAO3,conferring salt tolerance at the germination stage in rice(Oryza sativa L.),through map-based cloning ***3 is up-regulated under salt stress at the germination stage and highly expressed in various *** of OsPAO3 increases activity of polyamine oxidases,enhancing the polyamine content in seed *** polyamine may lead to the enhance of the activity of ROS-scavenging enzymes to eliminate over-accumulated H;O;and to reduce Na;content in seed coleoptiles to maintain ion homeostasis and weaken Na;*** changes resulted in stronger salt tolerance at the germination stage in *** findings not only provide a unique gene for breeding new salt-tolerant rice cultivars but also help to elucidate the mechanism of salt tolerance in rice.

关键词： Polyamine oxidase OsPAO3 Salt tolerance Germination stage Rice

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The genetic control of glabrous glume during African rice domestication

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Journal of Genetics and Genomics 2022年第5期49卷 427-436页

作者： Leqin Chang Min Hu Jing Ning Wei He Jiayu Gao Marie-Noelle Ndjiondjop Yongcai Fu Fengxia Liu Hongying Sun Ping Gu Chuanqing Sun zuofeng zhu State Key Laboratory for Agrobiotechnology National Center for Evaluation of Agricultural Wild Plants(Rice)Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China Africa Rice Center CotonouBenin State Key Laboratory of Plant Physiology and Biochemistry China Agricultural UniversityBeijing 100193China

African cultivated rice,Oryza glaberrima,is characterized by its glabrous *** domestication,the pubescent glumes of its wild ancestor,Oryza barthii,lost their trichomes,and in this study,we show that glabrous glume 5(GLAG5),a WUSCHEL-like homeobox transcription factor gene on chromosome 5,is required for trichome *** methylation associated with an hATtransposable element inserted in the promoter region of GLAG5 is found to reduce its expression,leading to the formation of glabrous glumes and leaves in African cultivated *** 82 African cultivated rice varieties investigated in this study,59(approximately 71%)lines exhibit glabrous glumes and harbor the hAT transposon;however,the other 23 varieties(approximately 29%),which exhibit pubescent glumes,lack the hAT transposon,indicating that glag5 had undergone strong artificial ***π;/π;ratios also show the hAT transposon insertions influence the genetic diversity of an approximately 150-kb interval encompassing the GLAG5 *** identification of the GLAG5 gene provides new insights into the domestication of cultivated rice in *** speculate that the selection of varieties with mutations in their promoter regions is an important aspect of crop domestication.

关键词： African rice The hAT transposon Domestication Trichomes Evolution

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A 48-bp deletion upstream of LIGULELESS 1 alters rice panicle architecture

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The Crop Journal 2024年第2期 354页

作者： Linhua Wu Min Hu Shuwei Lyu Wenfeng Chen Hang Yu Qing Liu Wei He Chen Li zuofeng zhu

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Haploids can be induced in knockout mutants of OsPLA1, but not OsDMP3 or OsDMP6, in rice

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The Crop Journal 2024年第1期

作者： Zongkai Liu Yu Zhong Xiaolong Qi Tai An Shuwei Guo Dong Wang Yuwen Wang Bin Feng zuofeng zhu Shaojiang Chen Chenxu Liu

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NARROW AND ROLLED LEAF 2 regulates leaf shape,male fertility, and seed size in rice

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Journal of Integrative Plant Biology 2016年第12期58卷 983-996页

作者： Shuangshuang Zhao Lei Zhao Fengxia Liu Yongzhen Wu zuofeng zhu Chuanqing Sun Lubin Tan National Center for Evaluation of Agricultural Wild Plants (Rice) Beijing Key Laboratory of Crop Genetic Improvement Laboratory of Crop Heterosis and Utilization MOE Department of Plant Genetics and Breeding China Agricultural University State Key Laboratory of Plant Physiology and Biochemistry China Agricultural University

Grain yield in rice （Oryza sativa L.） is closely related to leaf and flower development. Coordinative regulation of leaf, pollen, and seed development in rice as a critical biological and agricultural question should be addressed. Here we identified two allelic rice mutants with narrow and semi- rolled leaves, named narrow and rolled leaf2-1 （nrl2-1） and nr12- 2. Map-based molecular cloning revealed that NRL2 encodes a novel protein with unknown biochemical function. The mutation of NRL2 caused pleiotropic effects, including a reduction in the number of longitudinal veins, defective abaxial sclerenchymatous cell differentiation, abnormal tape- tum degeneration and microspore development, and the formation of more slender seeds compared with the wild type （WT）. The NRL2 protein interacted with Rolling-leaf （RL14）, causing the leaves of the nrl2 mutants to have a higher cellulose content and lower Iignin content than the WT, which may have been related to sclerenchymatous cell differentia- tion and tapetum degeneration. Thus, this gene is an essential developmental regulator controlling fundamental cellular and developmental processes, serving as a potential breeding target for high-yielding rice cultivars.

关键词： nrl2 narrow and rolled leaf sclerenchymatous cell malefertility seed size secondary cell wall

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A gain-of-function mutation of OsMAPK6 leads to long grain in rice

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The Crop Journal 2021年第6期9卷 1481-1485页

作者： Lina Xiong Lubin Tan Ran Xu zuofeng zhu Xianyou Sun Hongying Sun Chuanqing Sun State Key Laboratory of Plant Physiology and Biochemistry China Agricultural UniversityBeijing 100193China National Center for Evaluation of Agricultural Wild Plants(Rice) Beijing Key Laboratory of Crop Genetic ImprovementLaboratory of Crop Heterosis and UtilizationMinistry of EducationDepartment of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China

Grain size is one of the most important agronomic traits controlling grain yield. Development of novel germplasm with large grains would be beneficial for crop improvement. We report the genetic identification and functional analysis of the LONG GRAIN 6(LOG6) gene, which is identical to MITOGENACTIVATED PROTEIN KINASE 6(OsMAPK6), affecting grain length of rice. Map-based cloning revealed that the long-grain phenotype of log6-D results from a glutamine(E) to lysine(K) mutation in the conserved TEY motif of OsMAPK6. In near-isogenic lines(NILs), the log6-D allele increased grain length and grain yield of Guichao 2(GC2), Teqing(TQ), and 93–11. Sequence analysis revealed 10 OsMAPK6 haplotypes,with xian(indica) and geng(japonica) harboring different haplotypes. Our findings shed light on the function of MAPKs and offer a novel dominant allele for improving the grain yield of rice.

关键词： Rice Grain length OsMAPK6 MAPK TEY motif

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Molecular Evolution of the TACl Gene from Rice(Oryza sativa L.)

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Journal of Genetics and Genomics 2012年第10期39卷 551-560页

作者： Jiahuan Jiang Lubin Tan zuofeng zhu Yongcai Fu Fengxia Liu Hongwei Cai Chuanqing Sun State Key Laboratory of Plant Physiology and Biochemistry National Centre for Evaluation of Agricultural Wild Plants(Rice)Department of Plant Genetics and BreedingChina Agricultural University Beijing 100193 China Rice Research Institute Fujian Academy of Agricultural ScienceFuzhou 350018China

Tiller angle is a key feature of the architecture of cultivated rice （Oryza sativa）, since it determines planting density and influences rice yield. Our previous work identified Tiller Angle Control 1 （TACI） as a major quantitative trait locus that controls rice filler angle. To further clarify the evolutionary characterization of the TAC1 gene, we compared a TACl-containing 3164-bp genomic region among 113 cultivated varieties and 48 accessions of wild rice, including 43 accessions of O. rufipogon and five accessions of O. nivara. Only one single nucleotide polymorphism （SNP）, a synonymous substitution, was detected in TAC1 coding regions of the cultivated rice varieties, whereas one synonymous and one nonsynonymous SNP were detected among the TAC1 coding regions of wild rice accessions. These data indicate that little natural mutation and modification in the TAC1 coding region occurred within the cultivated rice and its progenitor during evolution. Nucleotide diversities in the TAC1 gene regions of O. sativa and O. rufipogon of 0.00116 and 0.00112, respectively, further indicate that TAC1 has been highly conserved during the course of rice domestication. A functional nucleotide polymorphism （FNP） of TAC1 was only found in the japonica rice group. A neutrality test revealed strong selection, especially in the 3＇-flanking region of the TAC1 coding region containing the FNP in the japonica rice group. However, no selection occurred in the indica and wild-rice groups. A phylogenetic tree derived from TAC1 sequence analysis suggests that the indica and japonica subspecies arose indepen- dently during the domestication of wild rice.

关键词： Diversity Evolution Rice Sequence TAC1

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GS6, A Member of the GRAS Gene Family,Negatively Regulates Grain Size in Rice

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Journal of Integrative Plant Biology 2013年第10期55卷 938-949页

作者： Lianjun Sun Xiaojiao Li Yongcai Fu zuofeng zhu Lubin Tan Fengxia Liu Xianyou Sun Xuewen Sun Chuanqing Sun State Key Laboratory of Plant Physiology and Biochemistry National Center for Evaluation of Agricultural Wild Plants (Rice) MOE Key Laboratory of Crop Heterosis and Utilization Key Laboratory of Crop Genetic Improvement Department of Plant Genetics and Breeding China Agricultural University State Key Laboratory of Plant Physiology and Biochemistry National Center for Evaluation of Agricultural Wild Plants(Rice) MOE Key Laboratory of Crop Heterosis and Utilization Key Laboratory of Crop Genetic Improvement Department of Plant Genetics and Breeding China Agricultural University

Grain size is an important yield-related trait in rice. Intensive artificial selection for grain size during domestication is evidenced by the larger grains of most of today＇s cultivars compared with their wild relatives. However, the molecular genetic control of rice grain size is still not well characterized. Here, we report the identification and cloning of Grain Size 6 （GS6）, which plays an important role in reducing grain size in rice. A premature stop at the ＋348 position in the coding sequence （CDS） of GS6 increased grain width and weight significantly. Alignment of the CDS regions of GS6 in 90 rice materials revealed three GS6 alleles. Most japonica varieties （95%） harbor the Type I haplotype, and 62.9% of indica varieties harbor the Type II haplotype. Association analysis revealed that the Type I haplotype tends to increase the width and weight of grains more than either of the Type II or Type III haplotypes. Further investigation of genetic diversity and the evolutionary mechanisms of GS6 showed that the GS6 gene was strongly selected in japonica cultivars. In addition, a ＂ggc＂ repeat region identified in the region that encodes the GRAS domain of GS6 played an important historic role in the domestication of grain size in rice. Knowledge of the function of GS6 might aid efforts to elucidate the molecular mechanisms that control grain development and evolution in rice plants, and could facilitate the genetic improvement of rice yield.

关键词： Domestication GS6 , grain size haplotype Oryza sativa rice.

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