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AOBPreview originally published online on May 14, 2004
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Annals of Botany 94: 133-138, 2004
© 2004 Annals of Botany Company

ISSR Variation in the Endemic and Endangered Plant Cycas guizhouensis (Cycadaceae)

LONG-QIAN XIAO1, XUE-JUN GE2, XUN GONG*,1, GANG HAO2 and SI-XIANG ZHENG3

1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China 2 South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China and 3 Yunnan Agriculture University, Kunming 650201, China

* For correspondence. Fax: +86 871 515 0227, e-mail gongxun{at}mail.kib.ac.cn

Received: 7 August 2003; Returned for revision: 14 January 2004; Accepted: 15 March 2004. Published electronically: 14 May 2004

• 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 %, HE = 0·0597; at species level, P = 35·90 %, HT = 0·1082) and a high degree of differentiation among populations (GST = 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.

Key words: Conservation genetics, Cycas guizhouensis, genetic diversity, ISSR.


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