Genetic diversity analysis of Lagerstroemia indica based on fluorescent SSR markers

WANG Zhiyi, LI Zhenfang, PENG Chan, CHEN Ying, ZHANG Xinye

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (2) : 61-69.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (2) : 61-69. DOI: 10.12302/j.issn.1000-2006.202203038

Genetic diversity analysis of Lagerstroemia indica based on fluorescent SSR markers

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Abstract

【Objective】 In this study, 239 germplasms of Lagerstroemia and one germplasm of Heimia were used to analyze the interspecific characteristics and genetic diversity of germplasm resources within L. indica, providing a scientific basis for collection, conservation and rational utilization of germplasm resources.【Method】 Genotypes of samples were identified based on 16 pairs of fluorescent primers; genotypes were read by the GeneMarker software. The characteristic loci of 239 germplasms of L. indica and one germplasm of H. myrtifolia were analyzed. The POPGENE, Cervus, NTSYS and GenAlEx software were used to estimate genetic diversity parameters, the cluster analysis and principal corrdinate analysis of 227 L. indica germplasms. 【Result】 Characteristic loci information of L. indica was the most abundant. Among the characteristic loci information reflected by 15 primers, L. indica all had unique loci that were different from the other six species, and some specific characteristic loci were not found in L. limii, L. excelsa and L. caudata. A total of 143 alleles were detected by 16 pairs of SSR(simple sequence repeat) fluorescent primers; there was an average of 8.938 alleles per locus and the average number of alleles per locus (Ne) was 3.600; Shannon’s Information Index (I) was 1.459, the average observed heterozygosity (Ho) was 0.577, the average expected heterozygosity (He) was 0.687, the average value of Nei’s genetic diversity index (H) was 0.685, and the average polymorphism information (PIC) in primers was 0.648. From the genetic diversity of 227 L. indica. based on the genetic distance between samples, a genetic cluster map was drawn and the samples were divided into 10 groups. The L. indica germplasm introduced from United States and wild L. indica germplasm from Hubei were relatively independent and clustered into different groups. The cluster analysis showed that L. indica germplasms were divided into 10 groups, among which the imported L. indica germplasm from the United States and the wild L. indica germplasm from Hubei were clustered into different groups. The principal corrdinate analysis showed that the 10 groups could be roughly divided into three regions, among which the wild L. indica germplasm from Hubei Province and the germplasm introduced from the United States were relatively clustered together.【Conclusion】 SSR markers can effectively reflect genetic diversity among L. indica germplasm resources, and can further optimize the collection and preservation of L. indica germplasm resources, build the core germplasm, create new varieties and provide a scientific basis for the rational development and utilization.

Key words

Lagerstroemia indica / genetic diversity / simple sequence repeat (SSR) / clustering analysis

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WANG Zhiyi , LI Zhenfang , PENG Chan , et al . Genetic diversity analysis of Lagerstroemia indica based on fluorescent SSR markers[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(2): 61-69 https://doi.org/10.12302/j.issn.1000-2006.202203038

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