Genetic Diversity Analysis and DNA Fingerprint Construction of Dendrobium Based on ISSR Markers
Flower Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007
International Journal of Molecular Evolution and Biodiversity, 2020, Vol. 10, No. 5
Received: 12 May, 2020 Accepted: 18 May, 2020 Published: 18 May, 2020
© 2020 BioPublisher Publishing Platform
This article was first published in 《分子植物育种》(ISSN1672-416X，CN46-1068/S) in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In order to make reasonable use of collected and preserved Dendrobium germplasm resources, ISSR molecular marker method was used to analyze the genetic relationship and genetic diversity of 22 Dendrobium species. A total of 6 primers with clear amplification bands, high polymorphism and good repeatability were chosen from 100 ISSR primers. The selected primers were used to amplify the genomic DNA of 22 Dendrobium species by PCR, and a total of 241 bands were generated, of which 241 were polymorphic bands. Polymorphic ratio was 100%. By GenAlEx 6.5 software, average value of observed allele number, effective number of alleles, Nei's gene diversity and Shannon's information index was 1.983, 1.167, 0.133 and 0.247, respectively, indicating that a high level of genetic diversity among 22 Dendrobium species. The genetic similarity coefficient among 22 Dendrobium species ranged from 0.698 4 to 0.878 7 by NTSYS-pc 2.1 software.UPGMA clustering based on genetic similarity coefficient, 22 Dendrobium species could be divided into 10 groups when genetic similarity was 0.795. UPGMA clustering results are consistent with traditional morphological classification results. The DNA fingerprint map constructed with 3 pairs of primers can separately identify 22 Dendrobium species. This research laid a theoretical foundation for the identification of Dendrobium germplasm resources and the selection of parents for cross breeding.
Dendrobium; ISSR molecular marker; Genetic diversity; DNA fingerprinting
International Journal of Molecular Evolution and Biodiversity
• Volume 10