title: ISSR variation in the endemic and endangered plant Cycas guizhouensis (Cycadaceae).
abstract: OBJECTIVE
  Cycas guizhouensis (Cycadaceae) is a rare and endangered species endemic to the southwest of China. An investigation was undertaken into the genetic variation of wild populations.
  
  
  METHODS
  ISSR markers were used to determine the genetic variation within and between 12 extant populations of this species.
  
  
  RESULTS
  Low genetic diversity (at population level, P = 14.21 %, H(E) = 0.0597; at species level, P = 35.90 %, H(T) = 0.1082) and a high degree of differentiation among populations (G(ST) = 0.4321) were detected.
  
  
  CONCLUSIONS
  This genetic structure is considered to be due to the combined effects of slow biochemical evolution, genetic drift, inbreeding and limited gene flow between populations. Based on these findings, strategies are proposed for the genetic conservation and management of the species.
authors.affiliation: Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China.
authors.forename: Long-qian
authors.initials: LQ
authors.lastname: Xiao
authors.forename: Xue-jun
authors.initials: XJ
authors.lastname: Ge
authors.forename: Xun
authors.initials: X
authors.lastname: Gong
authors.forename: Gang
authors.initials: G
authors.lastname: Hao
authors.forename: Si-xiang
authors.initials: SX
authors.lastname: Zheng
mesh_terms: D029784:Cycas / Q000235:genetics*; D040961:Genetic Drift; D005819:Genetic Markers; D014644:Genetic Variation; D005828:Genetics, Population; D005843:Geography
chemical_list: D005819:Genetic Markers