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Molecules 2017, 22(10), 1734; doi:10.3390/molecules22101734

Analysis of Genetic Diversity and Structure Pattern of Indigofera Pseudotinctoria in Karst Habitats of the Wushan Mountains Using AFLP Markers

1,†
,
2,†
,
2
,
1
,
1
and
2,*
1
Chongqing Academy of Animal Husbandry, Chongqing 400039, China
2
Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu 611130, China
These authors contributed equally to this work and should be considered co-first authors.
*
Author to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 9 October 2017 / Accepted: 9 October 2017 / Published: 16 October 2017
(This article belongs to the Section Molecular Diversity)
View Full-Text   |   Download PDF [2507 KB, uploaded 16 October 2017]   |  

Abstract

Indigofera pseudotinctoria Mats is an agronomically and economically important perennial legume shrub with a high forage yield, protein content and strong adaptability, which is subject to natural habitat fragmentation and serious human disturbance. Until now, our knowledge of the genetic relationships and intraspecific genetic diversity for its wild collections is still poor, especially at small spatial scales. Here amplified fragment length polymorphism (AFLP) technology was employed for analysis of genetic diversity, differentiation, and structure of 364 genotypes of I. pseudotinctoria from 15 natural locations in Wushan Montain, a highly structured mountain with typical karst landforms in Southwest China. We also tested whether eco-climate factors has affected genetic structure by correlating genetic diversity with habitat features. A total of 515 distinctly scoreable bands were generated, and 324 of them were polymorphic. The polymorphic information content (PIC) ranged from 0.694 to 0.890 with an average of 0.789 per primer pair. On species level, Nei’s gene diversity (Hj), the Bayesian genetic diversity index (HB) and the Shannon information index (I) were 0.2465, 0.2363 and 0.3772, respectively. The high differentiation among all sampling sites was detected (FST = 0.2217, GST = 0.1746, G’ST = 0.2060, θB = 0.1844), and instead, gene flow among accessions (Nm = 1.1819) was restricted. The population genetic structure resolved by the UPGMA tree, principal coordinate analysis, and Bayesian-based cluster analyses irrefutably grouped all accessions into two distinct clusters, i.e., lowland and highland groups. The population genetic structure resolved by the UPGMA tree, principal coordinate analysis, and Bayesian-based cluster analyses irrefutably grouped all accessions into two distinct clusters, i.e., lowland and highland groups. This structure pattern may indicate joint effects by the neutral evolution and natural selection. Restricted Nm was observed across all accessions, and genetic barriers were detected between adjacent accessions due to specifically geographical landform. View Full-Text
Keywords: AFLP; genetic diversity; habitat fragmentation; Indigofera pseudotinctoria; structure pattern AFLP; genetic diversity; habitat fragmentation; Indigofera pseudotinctoria; structure pattern
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Fan, Y.; Zhang, C.; Wu, W.; He, W.; Zhang, L.; Ma, X. Analysis of Genetic Diversity and Structure Pattern of Indigofera Pseudotinctoria in Karst Habitats of the Wushan Mountains Using AFLP Markers. Molecules 2017, 22, 1734.

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