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Characterization and evaluation of rice blast resistance of Chinese indica hybrid rice parental lines

The Crop Journal 2017年第6期5卷 509-517页

作者： Yunyu Wu Ling Yu Ning Xiao Zhengyuan Dai Yuhong Li Cunhong Pan Xiaoxiang Zhang Guangqing Liu Aihong Li Lixiahe Agricultural Research Institute of Jiangsu Province Yangzhou 225009 China Jiangsu Collaborative Innovation Center for modern Crop Production Nanjing 225009 China Jiangsu Golden Land Seed Industry Co. Ltd China

The development of resistant varieties and hybrid combinations has been the most effective and economical strategy to control blast disease caused by Magnaporthe ***, the distribution of major R genes and blast resistance characterization in hybrid rice parents has not been well investigated, resulting in their limited use in hybrid rice blast-resistance breeding. In the present study, 88 elite indica hybrid rice parental lines were evaluated with 30 isolates of M. oryzae collected from the main planting area of indica hybrid rice in China and were characterized for the presence of 11 major resistance genes using molecular markers. The pathogenicity assays showed that four types of hybrid rice parent line showed some resistance to M. oryzae. However, the proportions of highly resistant lines and the mean resistance frequency(RF) varied among the four types, with resistance in decreasing order shown by three-line restorer lines, three-line maintainer lines, two-line sterile lines, and two-line restorer lines. All 88 hybrid rice parental lines carried more than one R gene, but none carried the R genes Pi1 and Pi2. Although Pid3 and Pi9 were present only in three-line restorer lines and Pigm only in three-line maintainer lines, the remaining six R genes(Pib, Pid2, Pi5, Pia, Pi54, and Pita) were present in the four types of hybrid rice parent with significantly different distribution frequencies. The correlation between R genes and resistance reactions was investigated. The results are expected to provide useful information for rational utilization of major R genes in hybrid rice breeding programs.

关键词： Hybrid rice parental lines Magnaporthe oryzae Pi genes Resistance evaluation Molecular markers

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Identification of Genes Related to Mesocarp Development in Cucumber

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Horticultural Plant Journal 2020年第5期6卷 293-300页

作者： Xiaohua Qi Yamei Zhu Shuifeng Li Hanxi Zhou Xuewen Xu Qiang Xu Xuehao Chen College of Horticulture and Plant Protection Yangzhou UniversityYangzhou225009China Xiaoshan Agricultural Technology Extension Center Hangzhou 311200China

Cucumber(Cucumis sativus L.)is an agriculturally and economically important vegetable crop *** thickness of mesocarp is an important quality pertaining to *** development of mesocarp,however,has received little *** this study,we selected one thick mesocarp line D8 to analyze the gene expression profiles of mesocarp at 0,3,6,and 9 days after pollination(DAP)by RNA *** mainly related to ribosomes,carbon metabolism,biosynthesis of amino acids,and oxidative phosphorylation were up-regulated at 3 *** 3 to 6 DAP,the genes related to oxidative phosphorylation,photosynthesis,and phagosome were highly ***6 to 9 DAP,the genes related to plant hormone signal transduction were highly *** expressed genes linked to cyclin,hormone biosynthesis and signaling,carbon metabolism,and transcription factors MYB and WRKY were common up-regulated at 3,6,9 DAP in comparison with 0 *** auxin-responsive and cytokinin-responsive genes were significantly up-regulated in mesocarp *** higher expression levels of the auxin-responsive gene indole-3-acetic acid-amido synthetase 3.6 and the cytokinin response regulator 3/4b in the thick mesocarp cultivar D8 than in the thin mesocarp cultivar XUE1 might have explained the different growth rates of the mesocarp.

关键词： cucumber mesocarp auxin cytokinin RNA-seq

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Cucumber glossy fruit 1 (CsGLF1) encodes the zinc finger protein 6 that regulates fruit glossiness by enhancing cuticular wax biosynthesis

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Horticulture Research 2023年第1期10卷 152-159页

作者： Yan Yang Congxi Cai Yipeng Wang Yanran Wang Haolun Ju Xuehao Chen School of Horticulture and Plant Protection Yangzhou UniversityYangzhou225009Jiangsu ProvinceChina

Cucumber glossiness is an important visual quality trait that affects consumer *** evidence suggests that glossy trait is associated with cuticular wax ***,the molecular genetic mechanism controlling cucumber glossiness remains largely ***,we report the map-based cloning and functional characterization of CsGLF1,a locus that determines the glossy trait in ***1 encodes a homolog of the Cys_(2)His_(2)-like fold group(C2H2)-type zinc finger protein 6(ZFP6)and its deletion leads to glossier pericarp and decreased cuticular wax ***,transcriptomic analysis demonstrated that a group of wax biosynthetic genes were downregulated when CsZFP6 was ***,transient expression assay revealed that CsZFP6 acted as a transcription activator of cuticular wax biosynthetic *** together,our findings demonstrated a novel regulator of fruit glossiness,which will provide new insights into regulatory mechanism of fruit glossiness in cucumber.

关键词： gloss fruit mechanism

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PoWRKY71 is involved in Paeonia ostii resistance to drought stress by directly regulating light-harvesting chlorophyll a/b-binding 151 gene

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Horticulture Research 2023年第11期10卷 1-12页

作者： Yuting Luan Zijie Chen Ziwen Fang Xingqi Huang Daqiu Zhao Jun Tao College of Horticulture and Landscape Architecture Yangzhou UniversityYangzhou 225009China Department of Biochemistry Purdue UniversityWest LafayetteIN 47907USA Joint International Research Laboratory of agriculture and Agri-Product Safety the Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China

Although the functions of WRKY transcription factors in drought resistance are well known,their regulatory mechanisms in response to drought by stabilising photosynthesis remain ***,a differentially expressed PoWRKY71 gene that was highly expressed in drought-treated Paeonia ostii leaves was identified through transcriptome ***71 positively responded to drought stress with significantly enhanced expression patterns and overexpressing PoWRKY71 in tobacco greatly improved plant tolerance to drought stress,whereas silencing PoWRKY71 in *** resulted in a drought-intolerant ***,lower chlorophyll contents,photosynthesis,and inhibited expression of photosynthesis-related light-harvesting chlorophyll a/b-binding 151(CAB151)gene were found in PoWRKY71-silenced ***,a homologous system indicated that drought treatment increased PoCAB151 promoter *** assays revealed that PoWRKY71 directly bound on the W-box element of PoCAB151 promoter and activated its *** addition,PoCAB151 overexpressing plants demonstrated increased drought tolerance,together with significantly higher chlorophyll contents and photosynthesis,whereas these indices were dramatically lower in PoCAB151-silenced *** above results indicated that PoWRKY71 activated the expression of PoCAB151,thus stabilising photosynthesis via regulating chloroplast homeostasis and chlorophyll content in *** under drought *** study reveals a novel drought-resistancemechanism in plants and provides a feasible strategy for improving plant drought resistance via stabilising photosynthesis.

关键词： harvesting drought resistance

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Tolerance to low phosphorus in rice varieties is conferred by regulation of root growth

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The Crop Journal 2020年第4期8卷 534-547页

作者： Yaping Deng Chuanbao Men Shengfeng Qiao Wenjie Wang Junfei Gu Lijun Liu Zujian Zhang Hao Zhang Zhiqin Wang Jianchang Yang Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology Jiangsu Co-Innovation Center for Modern Production Technology of Grain CropsYangzhou UniversityYangzhou 225009JiangsuChina

Phosphorus use efficiency(PUE)can be improved through cultivation techniques and ***,little is known about rice(Oryza sativa L.)agronomic and physiological traits associated with high *** characterized the agronomic and physiological traits of rice varieties with different tolerances to low phosphorus in nutrient *** varieties with strong tolerance to low phosphorus(STVs)and two with weak tolerance(WTVs)were grown at normal(NP,control)and low phosphorus(LP,1/20 of NP)*** grown at LP produced significantly lower grain yield than those grown at *** yields were lower than STVs *** to NP,LP significantly increased phosphorus translocation efficiency(PTE),internal phosphorus efficiency(IPE)and phosphorus harvest index(PHI).Under the LP condition,PTE and IPE were higher for STVs than for *** also reduced tiller number,shoot biomass,leaf area index(LAI),leaf photosynthetic rate,and mean root diameter of both kinds of varieties at the main growth stages,but to a lower extent in *** significantly increased the number of productive tillers,root biomass,root-shoot ratio,root bleeding rate,and root acid phosphatase(RAP)*** root length,root oxidation activity(ROA),and root total and active absorbing surface areas for STVs were significantly increased under LP,whereas the opposite responses were observed for *** root length,ROA,root bleeding rate,root active absorbing surface area,and RAP activity were positively and significantly correlated with grain yield,PTE,and *** results suggest that the tolerance of rice varieties to a low-phosphorus growth condition is closely associated with root growth with higher biomass and activity.

关键词： Rice(Oryza sativa L.) Tolerance Phosphorus use efficiency Root traits

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Strategy for Use of Rice Blast Resistance Genes in Rice Molecular Breeding

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Rice science 2020年第4期27卷 263-277页

作者： XIAO Ning WU Yunyu LI Aihong Institute of Agricultural Sciences for Lixiahe Region in Jiangsu Yangzhou 225007China Jiangsu Collaborative Innovation Center for modern Crop Production Nanjing 210095China Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding Yangzhou UniversityYangzhou 225009China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China

Rice blast is one of the most destructive diseases affecting rice production *** development and rational use of resistant varieties has been the most effective and economical measure to control *** this review,we summarized the cloning and utilization of rice blast resistance genes,such as Pi1,Pi2,Pi9,Pi54,Pigm and *** concluded that three main problems in the current breeding of rice blast resistance are:availability of few R(resistance)genes that confer resistance to both seedling and panicle blast,the resistance effect of pyramided lines is not the result of a simple accumulation of resistance spectrum,and only a few R genes have been successfully used for molecular ***,novel utilization strategies for rice blast R genes in molecular breeding were proposed,such as accurately understanding the utilization of R genes in main modern rice varieties,creating a core resistant germplasm with excellent comprehensive traits,screening and utilizing broadspectrum and durable resistance gene ***,the trends and possible development direction of blast resistance improvement were also discussed,including new genes regulating resistance identified via GWAS(genome-wide association study)and improving rice blast resistance using genetic editing.

关键词： rice blast resistance gene molecular breeding strategy

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