کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1352276 | 980560 | 2009 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Genetic diversity of the endangered endemic Microcycas calocoma (Miq.) A. DC (Zamiaceae, Cycadales): Implications for conservation Genetic diversity of the endangered endemic Microcycas calocoma (Miq.) A. DC (Zamiaceae, Cycadales): Implications for conservation](/preview/png/1352276.png)
The diversity and genetic structure of seven populations of Microcycas calocoma (Miq.) A. DC, were analyzed by gel electrophoresis using 19 allozymes. The mean number of alleles per locus (A) was 1.49 and the percentage of polymorphic loci was relatively high (P = 48.09). The mean observed (Ho) and expected heterozygosity (He) were 0.20 and 0.17, respectively. The F-statistics revealed a high population structure (Fst = 0.34). Mean gene flow between population pairs was Nm = 0.96. Results were compared with those of other cycad species, and indicate that M. calocoma populations have become fragmented due to increasing pressures of habitat conversion and disturbance. Also, geographical isolation among populations has generated allele loss in relation to altitude. The establishment and maintenance of protected areas for in situ conservation is critical to preserve the high genetic diversity of M. calocoma. Conservation strategy guidelines have been specified.
Journal: Biochemical Systematics and Ecology - Volume 37, Issue 4, October 2009, Pages 385–394