Genomic consequences of interspecific Pinus spp. hybridization Academic Article uri icon

abstract

  • Strong karotypic orthoselection does not fully account for genome size variation in pines. Adult F1 interspecific pine hybrids are fertile and the genomic consequences of hybridization can be studied using haploid female megagametophytes. Greater variation in genome size was hypothesized to occur in hybrids compared to their parental species and the variation was thought to be positively related to the phylogenetic distance between the parental species. Nuclear 1C DNA content of megagametophytes from four sets of fertile Pinus spp. F1 hybrids and their parents was determined using a laser flow cytometer. Fertile F1 hybrids included two sets of hard pine hybrid Pinus elliottii Engelm. x P. caribaea var. hondurensis Morelet and two Asian x New World soft pine hybrids P. wallichiana A.B. Jacks. x P. strobus L. (hybrid is known as P. x schwerinii) and P. lambertiana Dougl. x P. armandii Franchlet. Fertile, adult F1 produce haploid megagametophytes with nuclear DNA contents comparable to the parents or parental species. One genomic consequence of hybridization in pines is stability in nuclear DNA content. Hybrid genomes neither increased or decreased DNA content regardless of the phylogenetic distance between parents. © 2002 The Linnean Society of London.

published proceedings

  • Biological Journal of the Linnean Society

author list (cited authors)

  • WILLIAMS, C. G., JOYNER, K. L., AUCKLAND, L. D., JOHNSTON, S., & PRICE, H. J.

citation count

  • 23

complete list of authors

  • WILLIAMS, CLAIRE G||JOYNER, KAREN L||AUCKLAND, LISA D||JOHNSTON, SPENCER||PRICE, H JAMES

publication date

  • April 2002