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Population Genetic Structure of Two Columnar Cacti with a Patchy Distribution in Eastern Brazil

Content Provider	Springer Nature Link
Author	Moraes, Evandro M. Abreu, Aluana G. Andrade, Sónia C.S. Sene, Fabio M. Solferini, Vera N.
Copyright Year	2005
Abstract	The genetic variability and population genetic structure of six populations of Praecereus euchlorus and Pilosocereus machrisii were investigated. The genetic variability in single populations of Pilosocereus vilaboensis, Pilosocereus aureispinus, and Facheiroa squamosa was also examined. All of these cacti species have a patchy geographic distribution in which they are restricted to small areas of xeric habitats in eastern Brazil. An analysis of genetic structure was used to gain insights into the historical mechanisms responsible for the patchy distribution of P. euchlorus and P. machrisii. High genetic variability was found at the populational level in all species (P=58.9–92.8%, Ap=2.34–3.33, He=0.266–0.401), and did not support our expectations of low variability based on the small population size. Substantial inbreeding was detected within populations (FIS=0.370–0.623). In agreement with their insular distribution patterns, P. euchlorus and P. machrisii had a high genetic differentiation (FST=0.484 and FST=0.281, respectively), with no evidence of isolation by distance. Accordingly, estimates of gene flow (Nm) calculated from FST and private alleles were below the level of Nm=1 in P. machrisii and P. euchlorus. These results favored historical fragmentation as the mechanism responsible for the patchy distribution of these two species. The genetic distance between P. machrisii and P. vilaboensis was not compatible with their taxonomic distinction, indicating a possible local speciation event in this genus, or the occurrence of introgression events.
Starting Page	311
Ending Page	323
Page Count	13
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	125
Issue Number	2-3
e-ISSN	15736857
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cactaceae Facheiroa squamosa Pilosocereus aureispinus, Pilosocereus machrisii Pilosocereus vilaboensis Praecereus euchlorus seasonally dry forests Human Genetics Plant Genetics & Genomics Microbial Genetics and Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Animal Science and Zoology Insect Science

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