Genetic variation and evolution of Polaskia chichipe (Cactaceae) under domestication in the Tehuacan Valley, central Mexico

Polaskia chichipe is a columnar cactus under artificial selection in central Mexico because of its edible fruits. Our study explored the effect of human manipulation on levels and distribution of genetic variation in wild, silviculturally managed and cultivated sympatric populations. Total genetic v...

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Bibliographic Details
Published in:Molecular ecology 2005-05, Vol.14 (6), p.1603-1611
Main Authors: Otero-Arnaiz, A, Casas, A, Hamrick, J.L, Cruse-Sanders, J
Format: Article
Language:English
Subjects:
alleles
alleles per locus
Biological Evolution
Biological variation
Cactaceae
Cactaceae - anatomy & histology
Cactaceae - genetics
Cactaceae - physiology
Cactus
Cluster Analysis
columnar cacti
crop evolution
Crops, Agricultural - genetics
dinucleotide repeats
domestication
Evolution
fruit crops
fruit growing
Gene Frequency
Genetic diversity
genetic markers
genetic resources
genetic structure
Genetic Variation
Genetics, Population
Genotype
Geography
heterozygosity
loci
Mexico
microsatellite repeats
Microsatellite Repeats - genetics
microsatellites
Polaskia chichipe
Population Dynamics
Reproduction - physiology
Selection, Genetic
wild relatives
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Summary:Polaskia chichipe is a columnar cactus under artificial selection in central Mexico because of its edible fruits. Our study explored the effect of human manipulation on levels and distribution of genetic variation in wild, silviculturally managed and cultivated sympatric populations. Total genetic variation, estimated in nine populations with five microsatellite loci, was HT = 0.658 ± 0.026 SE, which was mainly distributed within populations (HS = 0.646) with low differentiation among them (FST = 0.015). Fixation index (FIS) in all populations was positive, indicating a deficit of heterozygous individuals with respect to Hardy–Weinberg expectations. When populations were pooled by management type, the highest expected heterozygosity (HE = 0.631 ± 0.031 SE) and the lowest fixation index (FIS = 0.07) were observed in wild populations, followed by cultivated populations (HE = 0.56 ± 0.03 SE, FIS = 0.14), whereas the lowest variation was found in silviculturally managed populations (HE = 0.51 ± 0.05 SE, FIS = 0.17). Low differentiation among populations under different management types (FST 0.005, P 
ISSN:0962-1083
1365-294X
DOI:10.1111/j.1365-294X.2005.02494.x