title: Genetic diversity and population structure of two important medicinal plant species Schisandra chinensis and Schisandra sphenanthera revealed by nuclear microsatellites.
abstract: Seven polymorphic and transferable nuclear microsatellites were used to investigate the population structure of genetic diversity of Schisandra chinensis and Schisandra sphenanthera for facilitating their conservation and sustainable utilization. High levels of gene diversity were revealed in these two medicinal species, the majority of genetic diversity was harbored within populations, and population structure was might due to restricted gene flow among populations. Isolation by distance was close to significance in S. chinensis but not in S. sphenanthera. In S. chinensis, null alleles were identified as a cause for excess of homozygotes at loci G24 and WGA60, but inbreeding might also be partly responsible for the positive F ( IS ) values in this species. In contrast, null allele frequencies were high at all the seven loci in S. sphenanthera and resulted in overestimation of fixation index. The strategy for ex situ conservation of these two medicinal species is discussed based on the genetic results.
authors: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, 510650 Guangzhou, People's Republic of China.
authors: Ye
authors: Y
authors: Sun
authors: Xiangying
authors: X
authors: Wen
authors: Hongwen
authors: H
authors: Huang
mesh_terms: D000483:Alleles; D018744:DNA, Plant; D014644:Genetic Variation / Q000235:genetics*; D005828:Genetics, Population; D018895:Microsatellite Repeats / Q000235:genetics*; D010946:Plants, Medicinal / Q000235:genetics*; D025341:Principal Component Analysis; D032141:Schisandra / Q000235:genetics*
chemical_list: D018744:DNA, Plant