Fu Yuqing, Dane Fenny
Department of Horticulture, Auburn University, AL 36849, USA.
Ann Bot. 2003 Aug;92(2):223-30. doi: 10.1093/aob/mcg126. Epub 2003 Jun 26.
Allozyme genetic variation in 12 populations of the endangered Castanea pumila var. pumila (Allegheny chinkapin), sampled across the natural range of the species in the United States, was evaluated using 11 loci from seven enzyme systems. At the species level, the percentage of polymorphic loci (Ps) was 72.7 %, the mean number of alleles per locus (As) was 1.9, the mean number of alleles per polymorphic locus (APs) was 2.3, the effective number of alleles per locus (Aes) was 1.5 and the genetic diversity (Hes) was 0.296. At the population level, Pp = 49.2 %, Ap = 1.5, Aep = 1.4, APp = 2.1 and Hep = 0.21. Most of the allozyme variation (70 %) in C. pumila var. pumila occurred within populations. Wright's gene flow rate [Nm(W)] was as low as 0.57. Population differentiation along the species range was not detected. Populations of C. pumila var. pumila in Florida had the most variable levels of genetic diversity, but populations in Virginia and Mississippi also showed high levels. Based on the results of this study, conservation management strategies are discussed.
在美国，对濒危物种矮生栗（Allegheny栗）自然分布范围内的12个种群的等位酶遗传变异进行了评估，使用了来自7个酶系统的11个位点。在物种水平上，多态位点百分比（Ps）为72.7%，每个位点的平均等位基因数（As）为1.9，每个多态位点的平均等位基因数（APs）为2.3，每个位点的有效等位基因数（Aes）为1.5，遗传多样性（Hes）为0.296。在种群水平上，Pp = 49.2%，Ap = 1.5，Aep = 1.4，APp = 2.1，Hep = 0.21。矮生栗的大多数等位酶变异（70%）发生在种群内部。赖特基因流率[Nm(W)]低至0.57。未检测到沿物种分布范围的种群分化。佛罗里达州的矮生栗种群遗传多样性水平变化最大，但弗吉尼亚州和密西西比州的种群也表现出较高水平。基于本研究结果，讨论了保护管理策略。
