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Genetic diversity and population structure of Yucca filamentosa (Agavaceae)
Author(s) -
Massey Lisa K.,
Hamrick J. L.
Publication year - 1998
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.2307/2446326
Subject(s) - biology , outcrossing , genetic diversity , yucca , population , range (aeronautics) , biological dispersal , locus (genetics) , genetic structure , genetic variation , ecology , genetics , pollen , materials science , demography , sociology , gene , composite material
Using 19 allozyme loci we studied genetic diversity in 18 populations of Yucca filamentosa (Agavaceae) from the southeastern United States. Of the 19 loci surveyed, 17 (89.5%) were polymorphic in at least one of the populations sampled. There was considerable variation among populations in the percentage of polymorphic loci (range = 31.6–84.2%, mean = 67.6%). Similar heterogeneity among populations was observed for mean number of alleles per polymorphic locus (range = 2.0–3.0; mean = 2.48) and mean expected heterozygosity (range = 0.113–0.288; mean = 0.213). On average, 83% of the total genetic diversity was found within populations. Duplications of three allozyme loci were detected in several populations. The life‐history characteristics of Y. filamentosa (a long‐lived, semiwoody, predominantly outcrossing monocot with a large geographical range) may contribute to the maintenance of such high levels of genetic diversity. These results contradict expectations of the genetic structure of Y. filamentosa based on observations of the dispersal and pollination behavior of its sole pollinator, Tegeticula yuccasella, the yucca moth.