Genetic Diversity of Plant Tetraenamongolica by ISSR Markers

doi:10.7525/j.issn.1673-5102.2021.03.018

Abstract

Abstract:

Tetraena mongolica is an endangered plant belonging to a single genus， known as the ‘plant giant panda’. It has been included in the first batch of national rare and endangered plant red papers. It is a special shrub endemic to the west of Ordos Plateau and its distributed area is small. Six different geographical populations of T.mongolica were used as test materials. Six of the 30 UBC primers were screened for the most suitable primers， and the ISSR amplification reaction system and amplification procedure were reasonably optimized. The 370 bands were amplified from the primers， and 71% of T.mongolica was polymorphic bands. The results of the analysis can be shown as follows： ①The Nei’s gene diversity index was 0.316 8 and Shannon’s polymorphism information index was 0.458 6. The genetic diversity levels of T.mongolica different provenances were little different； ②The percentage of groups polymorphism allele in the population ranged from 70.00%-83.33%， the Nei’s genetic diversity index was 0.286 5-0.350 8， and the Shannon’s polymorphism information index was 0.423 6-0.504 9. The G_st of genetic differentiation coefficient between the six populations was 0.125 3， the results explain that there is a certain degree of genetic differentiation among populations； ③The gene flow of the six populations was 3.491 5>1， indicating that there was a certain gene flow among the six populations， which could prevent the genetic differentiation caused by genetic drift； ④Cluster analysis was used to classify the tetrahedrons of six different geographic populations into three groups. The populations of Qianligou， Yikebulage， and Balagong clustered into the first category， and then they were clustered with the Dengkou-taositu rabbits into the second category. There are two major categories， and the population of Natural Reserve of T.mongolica and the population Gandle Mountain constituted the third largest category. This shows that distance factors are the main factors that affect genetic differentiation among T.mongolica populations， but different habits conditions also have an impact on the genetic differentiation of T.mongolica populations.

Key words: Tetraenamongolica, genetic diversity, ISSR, population

CLC Number:

Q949.752.6

Yi-Zhong DUAN, Hai-Tao WANG, Ge-Ge ZHANG, Wei-Na YAN. Genetic Diversity of Plant Tetraenamongolica by ISSR Markers[J]. Bulletin of Botanical Research, 2021, 41(3): 466-473.

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