Articles
POPULATION STRUCTURE IN THE GENUS CARYA
Article number
948_16
Pages
143 – 158
Language
English
Abstract
The genus Carya includes diploid (n=x=16) and tetraploid (n=2x=32) species in the southeastern United States.
Only diploid species are found in Mexico, including three (Carya illinoinensis, C. ovate, and C. myristiciformis) also found in the U.S. One endemic (C. palmeri) is found only in Mexico.
Several species (C. cathayensis, C. dabieshanensis, C. tonkinensis, C. hunanensis, and C. kweichowensis), all putative diploids, are found only in Asia and are distributed from India, Thailand and Vietnam to eastern China.
Interspecific hybrids have been described between diploid species pairs, tetraploid species pairs and between diploid and tetraploid species.
Plastid and nuclear molecular markers have been used to confirm hybridity in many suspected interspecific hybrids, including sympatric populations of C. glabra and C. floridana collected in Florida where hybridization creates genetic diversity between geographic populations of both species.
Disjunct, geographically isolated populations of C. illinoinensis and C. ovate found in Texas offer resolution into the genetic bottlenecks that may precede regional extinction.
Populations include individuals regenerating from root sprouts so that multiple stems – at times the entire stand – are of a common genotype.
Seedling accessions of C. cathayensis have been found to share a single molecular profile, raising questions of the genetic diversity present in this economically important Asian species.
Interspecific hybridization with pecan has implications for long term maintenance of C. cathayensis, in light of the extensive recent establishment of pecan plantings.
Only diploid species are found in Mexico, including three (Carya illinoinensis, C. ovate, and C. myristiciformis) also found in the U.S. One endemic (C. palmeri) is found only in Mexico.
Several species (C. cathayensis, C. dabieshanensis, C. tonkinensis, C. hunanensis, and C. kweichowensis), all putative diploids, are found only in Asia and are distributed from India, Thailand and Vietnam to eastern China.
Interspecific hybrids have been described between diploid species pairs, tetraploid species pairs and between diploid and tetraploid species.
Plastid and nuclear molecular markers have been used to confirm hybridity in many suspected interspecific hybrids, including sympatric populations of C. glabra and C. floridana collected in Florida where hybridization creates genetic diversity between geographic populations of both species.
Disjunct, geographically isolated populations of C. illinoinensis and C. ovate found in Texas offer resolution into the genetic bottlenecks that may precede regional extinction.
Populations include individuals regenerating from root sprouts so that multiple stems – at times the entire stand – are of a common genotype.
Seedling accessions of C. cathayensis have been found to share a single molecular profile, raising questions of the genetic diversity present in this economically important Asian species.
Interspecific hybridization with pecan has implications for long term maintenance of C. cathayensis, in light of the extensive recent establishment of pecan plantings.
Publication
Authors
L.J. Grauke, M.A. Mendoza-Herrera
Keywords
Carya, interspecific hybrids, molecular markers
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