以COⅠ、16S r DNA和ITS基因为标记,选用环斑库蠓Culicoides circumscriptus(N267)作为外群,对海峡两岸10个群体77个荒川库蠓标本的遗传距离、基因分化、系统发育和种群结构进行分析。基于COⅠ、16S r DNA基因数据集及ITS基因数据集的AM...以COⅠ、16S r DNA和ITS基因为标记,选用环斑库蠓Culicoides circumscriptus(N267)作为外群,对海峡两岸10个群体77个荒川库蠓标本的遗传距离、基因分化、系统发育和种群结构进行分析。基于COⅠ、16S r DNA基因数据集及ITS基因数据集的AMOVA分析均显示,大的遗传变异主要来自种群内的遗传变异,在线粒体数据集及核糖体数据集的比例分别为96.75%和91.44%。不同基因的分子数据显示,不同种群间的荒川库蠓遗传分化程度低、基因交流频繁,各个地理种群没有按照地理区划形成独特的遗传结构。气流及人为因素可能是造成其远距离扩散的主要原因。展开更多
Tillering is an important agronomic trait which has a direct impact on plant type and grain yield. Strigolactones are a class of important phytohormones regulating rice tillering. ATMAX1 is an important gene involved ...Tillering is an important agronomic trait which has a direct impact on plant type and grain yield. Strigolactones are a class of important phytohormones regulating rice tillering. ATMAX1 is an important gene involved in strigolactone biosynthesis through encoding the protein P450 in Arabidopsis. Based on sequence BLASTp, we identified five homologous genes of ATMAX1 in rice, i.e., OsMAXla, OsMAXlb, OsMAXlc, OsMAXld and OsMAXle. Among them, OsMAXla and OsMAXle showed stable and high expression in rice tissues. In addition, we observed that OsMAXla and OsMAXle can rescue the branched phenotype and the influences caused by MAX1 mutation in Arabidopsis. Moreover, the expression of OsMAX1a and OsMAXle can respond to phosphate deficiency and different phytohormones, especially GR24, a strigolactone analogue. Therefore, it is concluded that OsMAX1a and OsMAX1e are involved in the biosynthesis of strigolactones and regulated rice tillering.展开更多
Two bacterial blight （BB） resistance genes, Xa21 and Xa4, from IRBB24 were introduced into hybrid rice restorer line Mianhui 725, which is highly susceptible to BB, by using hybridization and molecular marker-assist...Two bacterial blight （BB） resistance genes, Xa21 and Xa4, from IRBB24 were introduced into hybrid rice restorer line Mianhui 725, which is highly susceptible to BB, by using hybridization and molecular marker-assisted selection technology. Four homologous restorer lines were obtained through testing the R target genes with molecular markers and analyzing parental genetic background. Inoculation of the four lines and their hybrids with the specific strains of Xanthomonas oryzae pv. oryzae, P1, P6 and seven representative strains of Chinese pathotype, C Ⅰ -CⅦ, showed that all of the four lines and their hybrids were highly resistant and presented broad resistance-spectrum to BB. The hybrids of G46A / R207-2 displayed good agronomic characters and high yield potential, and R207-2 was named Shuhui 207.展开更多
Fifty-five representative samples of Rhizoctonia solani isolates, which were collected and isolated from five different ecological regions in Sichuan Province, China, were purified and analyzed for the pathogenicity a...Fifty-five representative samples of Rhizoctonia solani isolates, which were collected and isolated from five different ecological regions in Sichuan Province, China, were purified and analyzed for the pathogenicity and molecular genetic variation. The hyphal fusion test revealed that almost all the isolates belonged to the AG-IIA group except the isolate D42. In addition, some of the isolates were ＇bridging isolates＇, which could fuse with several groups simultaneously. The pathogenicity analysis on in vitro leaves confirmed a significant pathogenicity variation in the tested isolates. The 55 isolates were then classified into 8 groups by further RAPD （randomly amplified polymorphic DNA） cluster analysis at the similarity coefficient of 0.941. The results suggest that under the certain ecological conditions in Sichuan Province, China, most of the R. solanistrains were genetically stable, but a few changed drastically.展开更多
Hybrid rice significantly contributes to the food supply worldwide. Backbone parents play important roles in elite hybrid rice breeding systems. In this study, we performed pedigree-based analysis of the elite backbon...Hybrid rice significantly contributes to the food supply worldwide. Backbone parents play important roles in elite hybrid rice breeding systems. In this study, we performed pedigree-based analysis of the elite backbone parent rice variety, namely, Shuhui 527(SH527, Oryza sativa), to exploit key genome regions during breeding. Twenty-four cultivars(including SH527, its six progenitors and 17 derived cultivars) were collected and analyzed with high-density single nucleotide polymorphism(SNP) array. Scanning all these cultivars with genome-wide SNP data indicated the unique contributions of progenitors to the SH527 genome and identified the key genomic regions of SH527 conserved within all its derivatives. These findings were further supported by known rice yield-related genes or unknown QTLs identified by genome-wide association study. This study reveals several key regions for SH527 and provides insights into hybrid rice breeding.展开更多
文摘以COⅠ、16S r DNA和ITS基因为标记,选用环斑库蠓Culicoides circumscriptus(N267)作为外群,对海峡两岸10个群体77个荒川库蠓标本的遗传距离、基因分化、系统发育和种群结构进行分析。基于COⅠ、16S r DNA基因数据集及ITS基因数据集的AMOVA分析均显示,大的遗传变异主要来自种群内的遗传变异,在线粒体数据集及核糖体数据集的比例分别为96.75%和91.44%。不同基因的分子数据显示,不同种群间的荒川库蠓遗传分化程度低、基因交流频繁,各个地理种群没有按照地理区划形成独特的遗传结构。气流及人为因素可能是造成其远距离扩散的主要原因。
文摘Tillering is an important agronomic trait which has a direct impact on plant type and grain yield. Strigolactones are a class of important phytohormones regulating rice tillering. ATMAX1 is an important gene involved in strigolactone biosynthesis through encoding the protein P450 in Arabidopsis. Based on sequence BLASTp, we identified five homologous genes of ATMAX1 in rice, i.e., OsMAXla, OsMAXlb, OsMAXlc, OsMAXld and OsMAXle. Among them, OsMAXla and OsMAXle showed stable and high expression in rice tissues. In addition, we observed that OsMAXla and OsMAXle can rescue the branched phenotype and the influences caused by MAX1 mutation in Arabidopsis. Moreover, the expression of OsMAX1a and OsMAXle can respond to phosphate deficiency and different phytohormones, especially GR24, a strigolactone analogue. Therefore, it is concluded that OsMAX1a and OsMAX1e are involved in the biosynthesis of strigolactones and regulated rice tillering.
文摘Two bacterial blight （BB） resistance genes, Xa21 and Xa4, from IRBB24 were introduced into hybrid rice restorer line Mianhui 725, which is highly susceptible to BB, by using hybridization and molecular marker-assisted selection technology. Four homologous restorer lines were obtained through testing the R target genes with molecular markers and analyzing parental genetic background. Inoculation of the four lines and their hybrids with the specific strains of Xanthomonas oryzae pv. oryzae, P1, P6 and seven representative strains of Chinese pathotype, C Ⅰ -CⅦ, showed that all of the four lines and their hybrids were highly resistant and presented broad resistance-spectrum to BB. The hybrids of G46A / R207-2 displayed good agronomic characters and high yield potential, and R207-2 was named Shuhui 207.
基金the National High- tech Research and Development Program of China (Grant No. 2003AA212030)the Foundation for Doctorial Research in the Southwest University of Science and Technology (Grant No. 07ZX0101)the Program for Changjiang Scholars and Innovative Research Team in University of China (PCSIRT)(Grant No. IRT0453)
文摘Fifty-five representative samples of Rhizoctonia solani isolates, which were collected and isolated from five different ecological regions in Sichuan Province, China, were purified and analyzed for the pathogenicity and molecular genetic variation. The hyphal fusion test revealed that almost all the isolates belonged to the AG-IIA group except the isolate D42. In addition, some of the isolates were ＇bridging isolates＇, which could fuse with several groups simultaneously. The pathogenicity analysis on in vitro leaves confirmed a significant pathogenicity variation in the tested isolates. The 55 isolates were then classified into 8 groups by further RAPD （randomly amplified polymorphic DNA） cluster analysis at the similarity coefficient of 0.941. The results suggest that under the certain ecological conditions in Sichuan Province, China, most of the R. solanistrains were genetically stable, but a few changed drastically.
基金supported by the Sichuan Science and Technology Support Project, China (2016NZ0103)the National Natural Science Foundation of China (91435102 and 31570004)+1 种基金the Sichuan Provincial Founding for Distinguished Young Scholars, China (2015JQ0048)the Open Research Fund of State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, China (2016KF10)。
文摘Hybrid rice significantly contributes to the food supply worldwide. Backbone parents play important roles in elite hybrid rice breeding systems. In this study, we performed pedigree-based analysis of the elite backbone parent rice variety, namely, Shuhui 527(SH527, Oryza sativa), to exploit key genome regions during breeding. Twenty-four cultivars(including SH527, its six progenitors and 17 derived cultivars) were collected and analyzed with high-density single nucleotide polymorphism(SNP) array. Scanning all these cultivars with genome-wide SNP data indicated the unique contributions of progenitors to the SH527 genome and identified the key genomic regions of SH527 conserved within all its derivatives. These findings were further supported by known rice yield-related genes or unknown QTLs identified by genome-wide association study. This study reveals several key regions for SH527 and provides insights into hybrid rice breeding.
