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American Journal of Botany, Vol 84, 879, Copyright © 1997 by Botanical Society of America, Inc.

POPULATION BIOLOGY

Frequency and direction of hybridization in sympatric populations of Pinus taeda and P. echinata (Pinaceae)

MA Edwards-Burke, JL Hamrick and RA Price

Two naturally occurring, sympatric, northern Georgia populations of Pinus taeda L. (loblolly pine) and P. echinata Mill. (shortleaf pine) were examined with respect to genetic diversity within populations and the frequency, spatial distribution, and morphology of putative hybrids. Shortleaf pine predominated at the "road" site while loblolly pine predominated at the "granite outcrop" site. Hybrid individuals were identified by their IDH allozyme genotype, the only such locus known to be fixed for different alleles in the two species. All allozymatically detectable hybrids (34 at the road site and two at the granite outcrop site) were juveniles that were distributed in open, sunny patches. A similar pattern of recruitment was seen for juveniles of the parental species. Hybrids were spatially distant from mature shortleaf pine, suggesting that shortleaf pine was not the seed parent. Discriminant analysis on needle characteristics indicated that loblolly pine was easily distinguished from shortleaf pine and the hybrids, but that shortleaf pine and the hybrids were barely distinguishable from each other. A diagnostic cpDNA restriction site marker indicated that shortleaf pine sired all the hybrids at both sites. No evidence of later generation hybridization was found.


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M. Perron, D. J. Perry, C. Andalo, and J. Bousquet
Evidence from sequence-tagged-site markers of a recent progenitor-derivative species pair in conifers
PNAS, October 10, 2000; 97(21): 11331 - 11336.
[Abstract] [Full Text] [PDF]


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Copyright © 1997 by the Botanical Society of America, Inc.