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Putrescine Modulates Cadmium Fixation Ability of Cell Wall to Decrease Cadmium Accumulation in Rice,a Process Might Depend on Nitric Oxide

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Rice science 2024年第3期31卷 237-240,I0002-I0007页

作者： WANG Haoyu LI Su YANG Jibo HUANG Jing ZHU Xiaofang SHEN Renfang zeng dali College of Advanced Agricultural Sciences Zhejiang A&F UniversityHangzhou 311300China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of ScienceNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China

Although putrescine(PUT)has been linked to plants'responses to cadmium(Cd)stress,the exact mechanism is still elusive.In the current investigation,the endogenous PUT concentration in rice roots was enhanced by Cd stress.Exogenous PUT increased root cell wall hemicellulose levels,which in turn increased its Cd binding capacity,concurrently decreasing the transcription level of genes such as OsNRAMP1 and OsCd1 that are responsible for root Cd absorption.As a result。

关键词： absorption roots cadmium

LSL1 controls cell death and grain production by stabilizing chloroplast in rice

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Science China(Life Sciences) 2022年第11期65卷 2148-2161页

作者： Deyong Ren Wei Xie Qiankun Xu Jiang Hu Li Zhu Guangheng Zhang dali zeng Qian Qian State Key Lab of Rice Biology China National Rice Research InstituteHangzhou 310006China College of Modern Agriculure Zhejiang A&F UniversityHangzhou 31006China National Nanfan Research Institute Chinese Academy of Agricultural SciencesSanya 572024China

Lesion mutants can be valuable tools to reveal the interactions between genetic factors and environmental signals and to improve grain production.Here we identified a rice(Oryza sativa)mutant,lesion spotleaf1(lsl1),which produces necrotic leaf lesions throughout its life cycle.LSL1 encodes a protein of unknown function and belongs to a grass-specific clade.The lesion phenotype of the lsl1 mutant was sharply induced by shading,and its detached leaves incubated in 6-benzylamino purine similarly formed lesions in the dark.In addition,the lsl1 mutant exhibited reactive oxygen species accumulation and cell death.The terminal deoxynucleotidyl transferase d UTP nick end-labeling(TUNEL)and comet assays revealed that the lsl1 mutant contained severe DNA damage,resulting in reduced grain yield and quality.RNA sequencing,gene expression,and protein activity analyses indicate that LSL1 is required for chloroplast function.Furthermore,LSL1 interacts with Psa D and PAP10 to form a regulatory module that functions in chlorophyll synthesis and chloroplast development to maintain redox balance.Our results reveal that LSL1 maintains chloroplast structure,redox homeostasis,and DNA stability,and plays important roles in the interaction between genetic factors and environmental signals and in regulating grain size and quality.

关键词： lesion formation chloroplast function redox homeostasis grain size and quality LSL1 rice

Genetic and environmental control of rice tillering

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作物学报:英文版 2023年第5期11卷 1287-1302页

作者： Yuping Yan Chaoqing Ding Guangheng Zhang Jiang Hu Li Zhu dali zeng Qian Qian Deyong Ren State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006ZhejiangChina

Increasing tiller number is a target of high-yield rice breeding. Identification of tiller-defect mutants and their corresponding genes is helpful for clarifying the molecular mechanism of rice tillering. Summarizing research progress on the two processes of rice tiller formation, namely the formation and growth of axillary meristem, this paper reviews the effects of genetic factors, endogenous hormones, and exogenous environment on rice tillering, finding that multiple molecular mechanisms and signal pathways regulating rice tillering cooperate rice tillering, and discusses future research objectives and application of its regulatory mechanism. Elucidation of theis mechanism will be helpful for breeding high-yielding rice cultivars with ideal plant type via molecular design breeding.

关键词： Rice tiller Axillary meristem Tiller bud Genetic and external factors Regulatory mechanism

Genetic analysis of leaffolder resistance in rice

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Journal of Genetics and Genomics 2010年第5期37卷 325-331页

作者： Yuchun Rao Guojun Dong dali zeng Jiang Hu Longjun zeng Zhengyu Gao Guanghen Zhang Longbiao Guo Qian Qian State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China Graduate School of Chinese Academy of Agriculture Science Beijing 100081 China

A double haploid （DH） population, which consists of 120 lines derived from anther culture of a typical indica and japonica hybrid ‘CJ06＇/‘TNI＇, was used to investigate the genetic basis for rice leaffolder resistance. Using a constructed molecular linkage map, five QTLs for rolled leaves were detected on chromosomes 1, 2, 3, 4, and 8. The positive alleles from C J06 on chromosomes 3, 4, and 8 increased the resistance to rice leaffolder, and the alleles from TN1 on chromosomes 1 and 2 also enhanced resistance to leaffolder. The interactions between QTLs were identified and tested, and four conditional interactions were acquired for resistance to rice leaffolder. These loci were located on chromosomes 2, 9, 10, and 11, respectively. QTL pyramiding indicated that the positive alleles affect resistance to leaffolder. The prospective application of this data in rice breeding was also discussed.

关键词： rice （Oryza sativa L.） rice leaffolder QTL analysis conditional interaction

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 investigation.Rice mutants are useful for such research.We have identified a novel brittle culm 25(bc25)mutant with reduced growth and partial sterility.BC25 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 composition.Transmission electron microscopy analysis showed that the thickness of the secondary cell wall was reduced in bc25.Monosaccharide 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 redundancy.Enzymatic assays suggested that BC25 functions with high activity to interconvert UDP-glucuronic acid(UDP-Glc A)and UDP-xylose.GUS 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)-PCR.RNA-seq further suggested that BC25 is involved in sugar metabolism.We conclude that BC25 strongly influences rice cell wall formation.

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

Quantitative Trait Loci Mapping of Flag-leaf Ligule Length in Rice and Alignment with ZmLG1 Gene

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Journal of Integrative Plant Biology 2009年第4期51卷 360-366页

作者： dali zeng Jiang Hu Guojun Dong Jian Liu Longjun zeng Guangheng Zhang Longbiao Guo Yihua Zhou Qian Qian State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China Institute of Genetics and Developmental Biology the Chinese Academy of Sciences Beijing 100101 China

A doubled haploid （DH） population, which consists of 120 lines derived from anther culture of a typical indica and japonica hybrid‘CJ06＇/‘TNI＇, was used in this study. Ligule lengths of flag leaf were investigated for quantitative trait loci （QTL） mapping using the DH population. Five QTLs （qLL-2, qLL.4, qLL-6, qLL-IO and qLL-12） controlling the ligule length （LL） were detected on chromosomes 2, 4, 6, 10 and 12, with the variances explained 11.4%, 13.6%, 27.8%, 22.1% and 11.0%, respectively. Using four known genes of ZmGL1, ZmGL2, ZmGL3 and ZmGL4 in maize from the MaizeGDB, their homologs in rice were aligned and integrated into the existing simple sequence repeats linkage map by in silico mapping. A ZmLG1 homolog gene, OsLG1 encoding a squamosa promoter binding protein, was located between the markers RM255 and RM280, which is just identical to the interval of qLL.4 on the long arm of chromosome 4. The results are beneficial to dissection of the ligule molecular mechanism and the study of cereal evolution.

关键词： double haploid population in silico mapping ligule length of flag leaf quantitative trait loci rice.

Genetic analysis and fine-mapping of a dwarfing with withered leaf-tip mutant in rice

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Journal of Genetics and Genomics 2008年第12期35卷 715-721页

作者： Liang Jiang Longbiao Guo Hua Jiang dali zeng Jiang Hu Liwen Wu Jian Liu Zhenyu Gao Qian Qian State Key Lab of Rice Biology China National Rice Research Institute Hangzhou 310006 China Graduate School of Chinese Academy of Agricultural Sciences Beijing 100081 China

A dwarf mutant of rice （Oryza sativa L.） by mutagenesis of ethylene methylsulfonate （EMS） treatment from Nipponbare was identified. The mutant exhibited phenotypes of dwarfism and withered leaf tip （dwll）. Based on the intemode length of dwll, this mutant belongs to the dm type of dwarfing. Analysis of elongation of the second sheath and m-amylase activity in endosperm showed that the phenotype caused by dwll was insensitive to gibberellin acid treatment. Using a large F2 population derived from a cross between the dwll and an indica rice variety, TN1, the DWL1 gene was mapped to the terminal region of the long arm of chromosome 3. Fine-mapping delimited it into a 46 kb physical distance between two STS markers, HL921 and HL944, where 6 open reading frames were predicted. Cloning of DWL1 will contribute to dissecting molecular mechanism that regulates plant height in rice, which will be beneficial to molecular assisted selection of this important trait.

关键词： mutant dwarf fine mapping rice

LRG1 maintains sterile lemma identity by regulating OsMADS6 expression in rice

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Science China(Life Sciences) 2021年第7期64卷 1190-1192页

作者： Qiankun Xu Xiaoqi Yu Yuanjiang Cui Saisai Xia dali zeng Qian Qian Deyong Ren State Key Lab of Rice Biology China National Rice Research InstituteHangzhou 310006China

Dear Editor,Spikelet is the unique structural unit of grass panicles with florets and diverse glume-like organs.In rice,a normal spikelet usually has two pairs of glume-like organs,including a pair of sterile lemmas and a pair of rudimentary glumes.Generally,the sterile lemma is considered to be the severely degenerated bract,but its origin is still controversial.

关键词： sterile lemma panicle

Mapping QTLs for heading synchrony in a doubled haploid population of rice in two environments

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Journal of Genetics and Genomics 2009年第5期36卷 297-304页

作者： Liangyong Ma Changdeng Yang dali zeng Jing Cai Ximing Li Zhijuan Ji Yingwu Xia Qian Qian Jinsong Bao State Key Lab of Rice Biology China National Rice Research Institute Hangzhou 310006 China Key Laboratory of Zhejiang Province and Chinese Ministry of Agriculture for Nuclear-Agricultural Sciences Institute of Nuclear Agricultural Sciences Zhejiang University Hangzhou 310029 China

Simultaneous heading of plants within the same rice variety, also refer to heading synchrony, is an important factor that affects simultaneous ripening of the variety. Understanding of the genetic basis of heading synchrony may contribute to molecular breeding of rice with simultaneous heading and ripening. In the present study, a doubled haploid （DH） population, derived from a cross between Chunjiang 06 and TN1 was used to analyze quantitative trait locus （QTL） for heading synchrony related traits, i.e., early heading date （EHD）, late heading date （LHD）, heading asynchrony （HAS）, and tiller number （PN）. A total of 19 QTLs for four traits distributed on nine chromosomes were detected in two environments. One QTL, qHAS-8 for HAS, explained 27.7% of the phenotypic variation, co-located with the QTLs for EHD and LHD, but it was only significant under long-day conditions in Hangzhou, China. The other three QTLs, qHAS-6, qHAS-9, and qHAS-10, were identified under short-day conditions in Hainan, China, each of which explained about 11% of the phenotypic variation. Two of them, qHAS-6 and qHAS-9, were co-located with the QTLs for EHD and LHD. Two QTLs, qPN-4 and qPN-5 for PN, were detected in Hangzhou, and qPN-5 was also detected in Hainan. However, none of them was co-located with QTLs for EHD, LHD, and HAS, suggesting that PN and HAS were controlled by different genetic factors. The results of this study can be useful in marker assisted breeding for improvement of heading synchrony.

关键词： rice doubled haploid population heading synchrony quantitative trait loci （QTL）