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Ann Bot. 2004 Jul;94(1):133-8. Epub 2004 May 14.

ISSR variation in the endemic and endangered plant Cycas guizhouensis (Cycadaceae).

Author information

  • 1Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China.

Abstract

BACKGROUND AND AIMS:

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.

KEY 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.

PMID:
15145792
PMCID:
PMC4242375
DOI:
10.1093/aob/mch119
[PubMed - indexed for MEDLINE]
Free PMC Article
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