[Objective] This study was to reveal the genetic diversity and genetic relationship of the kenaf(Hibiscus cannabinus L.) resources from different origins, thus providing basis for genetic improvement and molecular mar...[Objective] This study was to reveal the genetic diversity and genetic relationship of the kenaf(Hibiscus cannabinus L.) resources from different origins, thus providing basis for genetic improvement and molecular marker-assisted breeding of kenaf. [Method] Ninety one ISSR molecular markers were used for amplification on 44 shares of kenaf germplasm resources, of which 21 showing good diversity and clear bands were chosen for PCR amplification. Based on amplification results, the genetic similarity coefficients among kenaf germplasm resources were calculated by using analytic software NTSYSpc-2.10e, and phylogenetic tree was then established via UPGMA. [Result] Totally 169 bands were amplified using the 21 screened primers, averagely 8.05 bands were amplified from each primer. Of them, 141 bands were polymorphic, accounting for 83.4%. When genetic similarity coefficient 0.887 was used as criterion L1, these 44 shares of kenaf germplasm could be classified to be 32 shares of cultivars and 12 shares of wild type or half-wild type varieties. When genetic similarity coefficient 0.897 was used as criterion L2, these 32 shares of cultivars could be further grouped into four sub-clusters. The genetic diversities between cultivars and wild type or half-wild type varieties were between 0.46-0.91, showing huge hereditary difference; while that among 32 cultivars were between 0.85-0.97, suggesting that genetic relationships among cultivars are relatively close and their genetic similarities are rather narrow. [Conclusion] ISSR could well determine the genetic similarities among kenaf germplasm resources and provide valuable molecular information for selecting parents of hybrid cross, which can lay a good foundation for DNA mapping of kenaf germplasm resources.展开更多
[Objective] The genetic diversity of major mango cultivars in China was analyzed by using SSR markers, and their fingerprints were constructed so as to provide theoretical basis for germplasm innovation and breeding o...[Objective] The genetic diversity of major mango cultivars in China was analyzed by using SSR markers, and their fingerprints were constructed so as to provide theoretical basis for germplasm innovation and breeding of mango. [Method] With 115 pairs of SSR primers, genetic diversity analysis and cluster analysis were performed for 30 mango cultivars, among which the genetic relationships were analyzed. [Result] Total 64 pairs of polymorphic primers were screened out from the 115 pairs of primers, and total 343 bands were amplified from the 30 cultivars with 73.2% of polymorphic bands. On average, 3.9 allelic loci were detected for each pair of primers with genetic diversity index of 0.5, Shannon＇s diversity index of 1.00 and polymorphism information content of 0.49, indicating higher genetic diversity. The cluster analysis showed that the 30 major cultivars could be classified into four categories. The first category included 14 cultivars; the second category included 11 cultivars, most of which were introduced from abroad; the third category included 4 cultivars, Le., Miansan, Parayinda, Baiyu and Hongxiangya： the fourth category included only one cultivar Maqiesu.By using 7 pairs of SSR markers, i.e., M42, M49, M54, M55, M96, M99 and M103, digital fingerprints were constructed for the 30 mango cultivars. [Conclusion] The 30 mango cultivars present more complex genomic genetics and abundant genetic information, and they have higher genetic diversity.展开更多
The objectives of this study were to isolate and characterize microsatellites from a heat tolerant variety of snap bean (Phaseolus vulgaris L.) in order to generate polymorphic genetic markers linked to quantitative t...The objectives of this study were to isolate and characterize microsatellites from a heat tolerant variety of snap bean (Phaseolus vulgaris L.) in order to generate polymorphic genetic markers linked to quantitative trait loci for heat tolerance. A genomic library contained 400-800 bp inserts was constructed and screened for the presence of (GA/CT) n and (CA/GT) n repeats. The proportion of positive clones yielded estimated of 3.72×10 4 such dinucleotide repeats per genome, roughly comparable to the abundance reported in other eukaryotic genomes. Twenty_six positive clones were sequenced. In contrast to mammalian genomes, the (GA/CT) n motif was much more abundant than the (CA/GT) n motif in these clones. The (GA/CT) n repeats also showed longer average repeat length (mean n =10.4 versus 6.5), suggesting that they are better candidates for yielding polymorphic genetic markers in the snap bean genome.展开更多
Most important agricultural traits of crops are controlled by many genes. These traits have complicated genetic basis and are difficult for genetic analysis. Due to application of molecular marker techniques in the la...Most important agricultural traits of crops are controlled by many genes. These traits have complicated genetic basis and are difficult for genetic analysis. Due to application of molecular marker techniques in the last two decades, genetic and molecular dissection of quantitative traits has become possible. In this paper, recent progress on mapping of quantitative trait loci in crops was reviewed.展开更多
In order to screen molecular markers linked to fertility restoring genes and further improve the breeding efficiency of restorer lines, in this study, wheat varieties 18A, 18B and 99AR144-1 were used as experimental m...In order to screen molecular markers linked to fertility restoring genes and further improve the breeding efficiency of restorer lines, in this study, wheat varieties 18A, 18B and 99AR144-1 were used as experimental materials to establish F2 fertility-segregating population. Plant quantitative trait ＂major gene ＋ polygene mixed mo- del＂ separation analysis method and simple sequence repeat （SSR） molecular markers were adopted for genetic analysis of four generations, including the parents （P~ and P2）, and hybrid （G and G） populations. The results show that AL-type fertility restoring gene is controlled by two pairs of additive-dominant-epistatic genes and addi- tive-dominant polygene; two primers linked to fertility restoring genes were selected by SSR molecular markers, including Xgwm95 on chromosome 2A and Barc61 on chromosome 1B, with the linkage distance of 15.0 cM and 18.0 cM, respectively. Based on verification, these two markers are reliable for distinguishing AL-type wheat ste- rile lines and restorer lines.展开更多
[Objective] The aim was to study on the genetic diversity of local varieties of Chinese Hu mulberry (Morus L.). [Method] The genetic diversity of 141 copies of Hu mulberry varieties was analyzed by ISSR molecular mark...[Objective] The aim was to study on the genetic diversity of local varieties of Chinese Hu mulberry (Morus L.). [Method] The genetic diversity of 141 copies of Hu mulberry varieties was analyzed by ISSR molecular markers. [Result] 12 ISSR primers had amplified a total of 90 amplified,of which 57 bands were polymorphic,and the polymorphic rate was 63.33%. The genetic similarity coefficients of 141 Hu mulberry germplasm resources varied from 0.633 3 to 1.000 0 with the average of 0.483 35,indicating that there was difference on genetic diversity among different varieties of Hu mulberries. A dendrogram of all 141 Hu mulberry varieties based on the genetic similarity coefficients using ISSR molecular markers was generated by UPGMA cluster method. Clustering of the 141 Hu mulberry varieties did not correspond with the conventional classification involving differences in style,leaf,branch,fruit and other morphological or agronomical characters. [Conclusion] Four subgroups clearly represented the genetic relationships in the 141 accessions which were benefit for the variety improvement and germplasm resource conservation.展开更多
基金Supported by The National High Technology Research and Development Program of China(2001AA241211)Industry Special:Studyon the Efficient Production and Harvest Technique in Ramee, Flax,Jute/Kenaf(NYHYJX07-18)~~
文摘[Objective] This study was to reveal the genetic diversity and genetic relationship of the kenaf(Hibiscus cannabinus L.) resources from different origins, thus providing basis for genetic improvement and molecular marker-assisted breeding of kenaf. [Method] Ninety one ISSR molecular markers were used for amplification on 44 shares of kenaf germplasm resources, of which 21 showing good diversity and clear bands were chosen for PCR amplification. Based on amplification results, the genetic similarity coefficients among kenaf germplasm resources were calculated by using analytic software NTSYSpc-2.10e, and phylogenetic tree was then established via UPGMA. [Result] Totally 169 bands were amplified using the 21 screened primers, averagely 8.05 bands were amplified from each primer. Of them, 141 bands were polymorphic, accounting for 83.4%. When genetic similarity coefficient 0.887 was used as criterion L1, these 44 shares of kenaf germplasm could be classified to be 32 shares of cultivars and 12 shares of wild type or half-wild type varieties. When genetic similarity coefficient 0.897 was used as criterion L2, these 32 shares of cultivars could be further grouped into four sub-clusters. The genetic diversities between cultivars and wild type or half-wild type varieties were between 0.46-0.91, showing huge hereditary difference; while that among 32 cultivars were between 0.85-0.97, suggesting that genetic relationships among cultivars are relatively close and their genetic similarities are rather narrow. [Conclusion] ISSR could well determine the genetic similarities among kenaf germplasm resources and provide valuable molecular information for selecting parents of hybrid cross, which can lay a good foundation for DNA mapping of kenaf germplasm resources.
基金Supported by Natural Science Foundation of Hainan Province(34128)Fundamental Scientific Research Funds of Chinese Academy of Tropical Agricultural Sciences(1630032013031)~~
文摘[Objective] The genetic diversity of major mango cultivars in China was analyzed by using SSR markers, and their fingerprints were constructed so as to provide theoretical basis for germplasm innovation and breeding of mango. [Method] With 115 pairs of SSR primers, genetic diversity analysis and cluster analysis were performed for 30 mango cultivars, among which the genetic relationships were analyzed. [Result] Total 64 pairs of polymorphic primers were screened out from the 115 pairs of primers, and total 343 bands were amplified from the 30 cultivars with 73.2% of polymorphic bands. On average, 3.9 allelic loci were detected for each pair of primers with genetic diversity index of 0.5, Shannon＇s diversity index of 1.00 and polymorphism information content of 0.49, indicating higher genetic diversity. The cluster analysis showed that the 30 major cultivars could be classified into four categories. The first category included 14 cultivars; the second category included 11 cultivars, most of which were introduced from abroad; the third category included 4 cultivars, Le., Miansan, Parayinda, Baiyu and Hongxiangya： the fourth category included only one cultivar Maqiesu.By using 7 pairs of SSR markers, i.e., M42, M49, M54, M55, M96, M99 and M103, digital fingerprints were constructed for the 30 mango cultivars. [Conclusion] The 30 mango cultivars present more complex genomic genetics and abundant genetic information, and they have higher genetic diversity.
文摘The objectives of this study were to isolate and characterize microsatellites from a heat tolerant variety of snap bean (Phaseolus vulgaris L.) in order to generate polymorphic genetic markers linked to quantitative trait loci for heat tolerance. A genomic library contained 400-800 bp inserts was constructed and screened for the presence of (GA/CT) n and (CA/GT) n repeats. The proportion of positive clones yielded estimated of 3.72×10 4 such dinucleotide repeats per genome, roughly comparable to the abundance reported in other eukaryotic genomes. Twenty_six positive clones were sequenced. In contrast to mammalian genomes, the (GA/CT) n motif was much more abundant than the (CA/GT) n motif in these clones. The (GA/CT) n repeats also showed longer average repeat length (mean n =10.4 versus 6.5), suggesting that they are better candidates for yielding polymorphic genetic markers in the snap bean genome.
文摘Most important agricultural traits of crops are controlled by many genes. These traits have complicated genetic basis and are difficult for genetic analysis. Due to application of molecular marker techniques in the last two decades, genetic and molecular dissection of quantitative traits has become possible. In this paper, recent progress on mapping of quantitative trait loci in crops was reviewed.
基金Special Foundation for "12th Five-year" Biological Germplasm Resources Innovation&Functional Gene Discovery and Utilization of Xinjiang Production and Construction Corps(No.2012BB047)"12th Five-year" Breeding Tacking Program of Xinjiang Production and Construction Corps(No.2011BA002)
文摘In order to screen molecular markers linked to fertility restoring genes and further improve the breeding efficiency of restorer lines, in this study, wheat varieties 18A, 18B and 99AR144-1 were used as experimental materials to establish F2 fertility-segregating population. Plant quantitative trait ＂major gene ＋ polygene mixed mo- del＂ separation analysis method and simple sequence repeat （SSR） molecular markers were adopted for genetic analysis of four generations, including the parents （P~ and P2）, and hybrid （G and G） populations. The results show that AL-type fertility restoring gene is controlled by two pairs of additive-dominant-epistatic genes and addi- tive-dominant polygene; two primers linked to fertility restoring genes were selected by SSR molecular markers, including Xgwm95 on chromosome 2A and Barc61 on chromosome 1B, with the linkage distance of 15.0 cM and 18.0 cM, respectively. Based on verification, these two markers are reliable for distinguishing AL-type wheat ste- rile lines and restorer lines.
基金Supported by National Science and Technology Infrastructure(2005DKA21002-09)
文摘[Objective] The aim was to study on the genetic diversity of local varieties of Chinese Hu mulberry (Morus L.). [Method] The genetic diversity of 141 copies of Hu mulberry varieties was analyzed by ISSR molecular markers. [Result] 12 ISSR primers had amplified a total of 90 amplified,of which 57 bands were polymorphic,and the polymorphic rate was 63.33%. The genetic similarity coefficients of 141 Hu mulberry germplasm resources varied from 0.633 3 to 1.000 0 with the average of 0.483 35,indicating that there was difference on genetic diversity among different varieties of Hu mulberries. A dendrogram of all 141 Hu mulberry varieties based on the genetic similarity coefficients using ISSR molecular markers was generated by UPGMA cluster method. Clustering of the 141 Hu mulberry varieties did not correspond with the conventional classification involving differences in style,leaf,branch,fruit and other morphological or agronomical characters. [Conclusion] Four subgroups clearly represented the genetic relationships in the 141 accessions which were benefit for the variety improvement and germplasm resource conservation.
