Genetic variation in the endemic plant Cycas debaoensis on the basis of ISSR analysis
Genetic variation in the endemic plant Cycas debaoensis on the basis of ISSR analysis
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DOI：
10.1071/bt04068
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发表时间：
2005-04
影响因子：
1.1
通讯作者：
Jianguang Xie;Shu-guang Jian;L. Nian
中科院分区：
文献类型：
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作者：
Jianguang Xie;Shu-guang Jian;L. Nian
德保苏铁 (Cycas debaoensis Y.C.Zhong et C.J.Chen) 是我国南方特有的珍稀濒危苏铁树种。它有分裂的耳廓。通过使用简单序列重复（ISSR）标记来研究物种的遗传变异。该物种表现出中等水平的遗传多样性（种群水平P = 34.7％，H = 0.141，I = 0.204；物种水平P = 57.4％，H = 0.215，I = 0.315）和种群间高水平的遗传分化（Gst = 0.342）。因此，基于 Gst 的基因流间接估计值较低（Nm = 0.481）。狭窄的定殖区域和岛屿分布格局，加上种群间有限的基因流动和遗传漂变，可能在塑造德保花螺的遗传结构中发挥重要作用。根据这些发现，提出了该物种的保护和管理策略。
Cycas debaoensis Y.C.Zhong et C.J.Chen is a rare and endangered cycad species that is endemic to South China. It has divided pinnae. Genetic variation in the species was investigated by using an intersimple sequence repeat (ISSR) marker. The species exhibits a moderate level of genetic diversity (at population level P = 34.7%, H = 0.141, I = 0.204; at species level P = 57.4%, H = 0.215, I = 0.315) and a high level of genetic differentiation among populations (Gst = 0.342). Thus, the indirect estimate of gene flow on the basis of Gst was low (Nm = 0.481). The narrow colonisation area and island pattern of distribution, combined with limited gene flow among populations and genetic drift, may play an important role in shaping the genetic structure of C. debaoensis. On the basis of these findings, strategies are suggested for the conservation and management of the species.