Journal
AQUATIC BOTANY
Volume 87, Issue 1, Pages 69-74Publisher
ELSEVIER
DOI: 10.1016/j.aquabot.2007.03.006
Keywords
Ceratopteris pteridoides; genetic variation; ISSR; spore dispersal
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The levels and pattern of the genetic variation within and among populations of the endangered fern Ceratopterispteridoides (Hook.) Hieron in China were investigated using inter-simple sequence repeat (ISSR) markers. Thirteen ISSR primers used in the study amplified 125 reproducible bands with 56 (PPB = 44.8%) being polymorphic, indicating a relative low level of genetic diversity at the species level. Genetic diversity varied greatly among populations with the PPB values ranging from 14.4% to 32%. The coefficient of genetic differentiation between populations (Gs,) was 0.297, indicating low level of genetic variation between C pteridoides populations. AMOVA analysis also revealed a low level of genetic differentiation among the five populations. Of the total genetic diversity, 26.17% was attributable to among-population diversity. The UPGMA cluster of all samples showed that individuals from the same population occasionally failed to cluster in one distinct group indicating extensive inter-population gene flow among the remaining populations of C. pteridoides in China. A Mantel test showed no significant correlation between genetic distance and geographic distance (r = 0.44, P = 0.91) suggesting that gene flow was not restricted geographically. A number of ways including clonal growth, genetic drift and inbreeding, the extensive hydrologic connectivity among populations, which facilitated long-distance gene flow, might have affected the genetic profiles of C. pteridoides. (C) 2007 Published by Elsevier B.V.
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