Genetic Diversity and Phylogenetics of Malus baccata (L.) Borkh Revealed by Chloroplast DNA Variation
GAO Yuan, WANG DaJiang, WANG Kun,, CONG PeiHua,, ZHANG CaiXia, LI LianWen, PIAO JiChengResearch Institute of Pomology, Chinese Academy of Agricultural Sciences/Key Laboratory of Horticultural Crops Germplasm Resources Utilization, Ministry of Agriculture, Xingcheng 125100, Liaoning
Abstract 【Objective】Malus baccata (L.) Borkh is the most widely distributed native species in China. The non-coding region of chloroplast genome by maternal inheritance is suitable for the systematic study of lower taxonomic levels (such as families and genera). The non-coding regions of cpDNA of 215 germplasms were sequenced, and their genetic variation was analyzed. In this study, the genetic diversity of Malus baccata and the phylogenetic relationship among different populations were explored from the perspective of maternal inheritance, which provided a theoretical basis for origin and genetic evolution, collection and protection of Malus baccata germplasm resources in China.【Method】Four non-coding regions (trnH-psbA, trnS-trnG spacer + intron, trnT-5'trnL and 5'trnL-trnF) of 215 germplasms were amplified by four primers. After manually proofreading sequences obtained through forward and backward sequencing, MEGA 7.0 was used for sequence splicing and alignment, and based on genetic distance, the Neighbour-Joining phylogenetic tree was constructed among different populations of Malus baccata. DnaSP ver5.10.01 was used to calculate the genetic diversity parameters of chloroplast DNA, gene flow and gene differentiation among different populations. Arlequin v3.5 was used to analyze standard molecular variation (AMOVA), and NetWork 4.6.1.2 was used to construct Median-Joining network for cpDNA haplotypes among intraspecific populations of Malus baccata.【Result】The length of four non-coding regions of chloroplast DNA was 3 777 bp after sequencing, splicing, alignment and merging, and 171 variable sites were detected, which included 1 singleton variable sites, 20 parsimony informative sites and 150 insertion-deletion gaps. Among 215 accessions of Malus baccata, the number of variable sites of region trnH-psbA, trnS-trnG spacer + intron, trnT-5'trnL and 5'trnL-trnF were 26, 32, 103 and 10, respectively. The number of haplotypes for four regions were 8, 8, 6 and 4, respectively, and after four regions merged, the haplotypes of chloroplast DNA fragments were 24. The region with highest nucleotide diversity was trnT-5'trnL (Pi=0.01174), and the region with highest haplotype diversity was trnS-trnG spacer + intron (Hd=0.599), and the haplotype diversity of 5'trnL-trnF was the lowest (Hd=0.228). The cpDNA diversity of Malus baccata was high (Hd=0.727, Pi=0.00577). Tajima’s test showed all Tajima’s D values were not statistical at different levels, which indicated that variation of those chloroplast regions followed natural theory of molecular evolution. AMOVA showed that genetic variation mainly existed within populations.【Conclusion】The four non-coding regions of chloroplast DNA were suitable for the analysis of genetic diversity and phylogenetics of Malus baccata. At the cpDNA level, it was not natural selection, but mutation pressure and genetic drift that led to population evolution of Malus baccata. The genetic differentiation among populations was not completely correlated with their geographical distance. Malus baccata might originate from several sites, and the three possible origins, including Heilongjiang and Jilin, Inner Mongolia, Gansu and Shanxi, were inferred. Keywords:Malus baccata;chloroplast DNA;non-coding region;genetic diversity;phylogenetics
PDF (698KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 高源, 王大江, 王昆, 丛佩华, 张彩霞, 李连文, 朴继成. 基于叶绿体DNA变异的山荆子种质遗传多样性和系统演化[J]. 中国农业科学, 2020, 53(3): 600-611 doi:10.3864/j.issn.0578-1752.2020.03.012 GAO Yuan, WANG DaJiang, WANG Kun, CONG PeiHua, ZHANG CaiXia, LI LianWen, PIAO JiCheng. Genetic Diversity and Phylogenetics of Malus baccata (L.) Borkh Revealed by Chloroplast DNA Variation[J]. Scientia Acricultura Sinica, 2020, 53(3): 600-611 doi:10.3864/j.issn.0578-1752.2020.03.012
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