The Fujian oyster(Crassostrea angulata) is an economically significant shellfish species distributed mainly along the Fujian coast, Southeast China. However, its genetic diversity and structure remain unclear. The mai...The Fujian oyster(Crassostrea angulata) is an economically significant shellfish species distributed mainly along the Fujian coast, Southeast China. However, its genetic diversity and structure remain unclear. The main distribution area of the C. angulata is located in Fujian, South China. In total, 420 C. angulata were collected from 14 natural habitats(populations) along the Fujian coast, and their genetic diversity and structure were analyzed in the mitochondrial COI and nuclear gene ITS2 sequences. Results reveal that all the 14 populations of C. angulata exhibited high levels of genetic diversity, with a total of 57(haplotype diversity: 0.811±0.016) and 124(haplotype diversity: 0.912±0.007) haplotypes revealed by COI and ITS2, respectively. Notably, significant intermediate level of genetic differentiations between the Ningde Zhujiang(ZJ) population(FS T by COI: 0.035–0.142, P<0.05;FS T by ITS2: 0.078–0.123, P<0.05) with other populations were observed for the first time, which is also supported by the results of molecular variance analysis(FC T by COI: 0.105, P<0.05;FC T by ITS2: 0.086, P<0.05) and the clustering of the ZJ population into distinct branches in the interpopulation genetic differentiation tree. Furthermore, the evolutionary tree and haplotype network analyses do not support the formation of a clear geographical genealogical structure among these 14 populations. In addition, the population dynamics analysis suggests that the C. angulata may have undergone expansion during the third ice age of the Pleistocene. These results provide a reference for the preservation and further genetic improvement of C. angulata.展开更多
为建立白及药材的分子标记鉴定方法,该文提取白及及其混伪品药材的基因组DNA,利用PCR技术扩增r DNA ITS2片段,片段经双向测序、排序、比对,构建邻接树,查找SNP位点。结果显示,ITS2序列不仅能够有效地区分白及与其混伪品,而且存在可用作...为建立白及药材的分子标记鉴定方法,该文提取白及及其混伪品药材的基因组DNA,利用PCR技术扩增r DNA ITS2片段,片段经双向测序、排序、比对,构建邻接树,查找SNP位点。结果显示,ITS2序列不仅能够有效地区分白及与其混伪品,而且存在可用作白及、黄花白及与其混伪药材鉴别的SNP位点。针对标记白及药材的SNP位点设计引物,通过筛选引物和优化特异性扩增条件后,获取引物BJ59-412F,BJ59-412R,HHBJ-225R在同一扩增条件下,可有效扩增白及、黄花白及,其产物长度分别约为350,520 bp,而混伪品则无PCR条带产生。该文所述引物和建立的反应条件可成功将白及、黄花白及与其混伪品药材进行同步鉴定,操作快速、简捷,结果可靠,可作为白及药材的快速分子鉴定方法。展开更多
基金Supported by the National Natural Science Foundation of China(No.32172979)the Natural Science Foundation of Fujian Province(No.2021J05159)the 2023 Special Program for Promoting High-Quality Development of Marine and Fishery Industry in Fujian Province(No.PJHYF-L-2023-2)。
文摘The Fujian oyster(Crassostrea angulata) is an economically significant shellfish species distributed mainly along the Fujian coast, Southeast China. However, its genetic diversity and structure remain unclear. The main distribution area of the C. angulata is located in Fujian, South China. In total, 420 C. angulata were collected from 14 natural habitats(populations) along the Fujian coast, and their genetic diversity and structure were analyzed in the mitochondrial COI and nuclear gene ITS2 sequences. Results reveal that all the 14 populations of C. angulata exhibited high levels of genetic diversity, with a total of 57(haplotype diversity: 0.811±0.016) and 124(haplotype diversity: 0.912±0.007) haplotypes revealed by COI and ITS2, respectively. Notably, significant intermediate level of genetic differentiations between the Ningde Zhujiang(ZJ) population(FS T by COI: 0.035–0.142, P<0.05;FS T by ITS2: 0.078–0.123, P<0.05) with other populations were observed for the first time, which is also supported by the results of molecular variance analysis(FC T by COI: 0.105, P<0.05;FC T by ITS2: 0.086, P<0.05) and the clustering of the ZJ population into distinct branches in the interpopulation genetic differentiation tree. Furthermore, the evolutionary tree and haplotype network analyses do not support the formation of a clear geographical genealogical structure among these 14 populations. In addition, the population dynamics analysis suggests that the C. angulata may have undergone expansion during the third ice age of the Pleistocene. These results provide a reference for the preservation and further genetic improvement of C. angulata.
文摘为建立白及药材的分子标记鉴定方法,该文提取白及及其混伪品药材的基因组DNA,利用PCR技术扩增r DNA ITS2片段,片段经双向测序、排序、比对,构建邻接树,查找SNP位点。结果显示,ITS2序列不仅能够有效地区分白及与其混伪品,而且存在可用作白及、黄花白及与其混伪药材鉴别的SNP位点。针对标记白及药材的SNP位点设计引物,通过筛选引物和优化特异性扩增条件后,获取引物BJ59-412F,BJ59-412R,HHBJ-225R在同一扩增条件下,可有效扩增白及、黄花白及,其产物长度分别约为350,520 bp,而混伪品则无PCR条带产生。该文所述引物和建立的反应条件可成功将白及、黄花白及与其混伪品药材进行同步鉴定,操作快速、简捷,结果可靠,可作为白及药材的快速分子鉴定方法。
