title: AFLP assessment of genetic variability and relationships in an Asian wild germplasm collection of Dactylis glomerata L.
abstract: Orchardgrass (Dactylis glomerata L.), an excellent perennial and cool season forage species distributed in most temperate regions, has been cultivated widely in Western China. Amplified fragment length polymorphism markers were employed to determine the genetic variability and population structure among 41 indigenous orchardgrass accessions from Central Asia and Western China. On the basis of 531 polymorphic fragments resulted from eight primer combinations, polymorphic information content (PIC), marker index (MI) and resolving power (RP) averaged 0.252, 16.34 and 25.27 per primer combination, respectively, demonstrating the high efficiency and reliability of the markers used. We found relatively low differentiation (Fst=0.135) for three geographical groups, where Central Asia (CA) and Southwest China (SWC) group exhibited higher intra-population diversity (He=0.20 and 0.21) than that of the Xinjiang (XJ) group (He=0.14). We also did not detect a clear pattern of isolation by distance with a low value of r=0.301 in the Mantel test. STRUCTURE, FLOCK, UPGMA clustering and PCoA analyses showed that CA group is more related to the SWC Group rather than to the XJ Group. In addition, this study strongly suggests that geographical and ecological environmental factors together could better explain the genetic differentiation between different geographical regions than geographic isolation alone, especially for Xinjiang accessions. The present study also could support that Southwest China might be the internal diversity center of D. glomerata in China. The knowledge about the genetic variability of the Asian accessions examined contributes to rapid characterization, defining gene pools of wild accessions, and selecting appropriate germplasms for plant improvement.
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Sun
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Chenglin
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: XinQuan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Chongqing Municipal Institute of Animal Husbandry, Chongqing 400039, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Fan
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Kaixin
authors.initials: K
authors.lastname: Fu
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Wendan
authors.initials: W
authors.lastname: Wu
authors.affiliation: Sichuan Academy of Grassland Science, Chengdu, Sichuan 611731, China.
authors.forename: Shiqie
authors.initials: S
authors.lastname: Bai
authors.affiliation: Sichuan Academy of Grassland Science, Chengdu, Sichuan 611731, China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Peng
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Linkai
authors.initials: L
authors.lastname: Huang
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, Sichuan 611130, China. Electronic address: maroar@126.com.
authors.forename: Xiao
authors.initials: X
authors.lastname: Ma
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis; D001208:Asia; D031745:Dactylis / Q000235:genetics*; D014644:Genetic Variation
keywords: AFLP; Climate; Dactylis glomerata; Environmental adaptation; Genetic structure; Geographic groups