Xiao Long-qian, Ge Xue-jun, Gong Xun, Hao Gang, Zheng Si-xiang
Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China.
Ann Bot. 2004 Jul;94(1):133-8. doi: 10.1093/aob/mch119. Epub 2004 May 14.
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.
ISSR markers were used to determine the genetic variation within and between 12 extant populations of this species.
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.
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.
贵州苏铁(苏铁科)是中国西南部特有的珍稀濒危物种。对其野生种群的遗传变异进行了调查。
利用ISSR标记确定该物种12个现存种群内部和种群之间的遗传变异。
检测到低遗传多样性(在种群水平上,P = 14.21%,H(E) = 0.0597;在物种水平上,P = 35.90%,H(T) = 0.1082)以及种群间的高度分化(G(ST) = 0.4321)。
这种遗传结构被认为是缓慢的生化进化、遗传漂变、近亲繁殖以及种群间有限的基因流动共同作用的结果。基于这些发现,提出了该物种遗传保护和管理的策略。