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Annals of Botany 86: 1081-1086, 2000
© 2000 Annals of Botany Company

Flow Cytometric Analysis of DNA Content for Tropical and Temperate New World Pines

S. E. Hall, W. S. Dvorak, J. S. Johnston, H. J. Price and C. G. Williams+

Genetics Program, Texas A&M University, College Station, Texas 77843-2135, USA CAMCORE, Box 7626, North Carolina State University, Raleigh, North Carolina 27695-7626, USA

Received: 13 April 2000 ; Returned for revision: 19 May 2000 . Accepted: 1 August 2000

Temperate pine species have unusually large, complex genomes which make genomic analysis problematic; it has been suggested that tropical pines might have smaller genome sizes than temperate pines. Laser flow cytometry (LFC) was used to measure genome sizes of 11 species from Mexico, Guatemala and Nicaragua, spanning latitudes 14°–37° N. These values were compared with previously reported LFC estimates for 17 subtropical and temperate species. Genome sizes in this study were large, varying 1.6-fold from 19.94 to 31. 76 pg/C. Genome size variation paralleled taxonomic classification more closely than latitudinal origin. Genome sizes of subgenus Strobus(soft pines) were larger, ranging from 27.36 to 31.76 pg/C; those of subgenus Pinus(hard pines) were smaller, ranging from 19.94 to 24.91 pg/C. The exception was hard pine subsection Macrocarpae which had larger genome sizes ranging from 26.33 to 28.35. Intraspecific variation was substantial for tropical hard pines P. oocarpa andP. tecunumanii yet negligible for tropical hard pine P. patula. Copyright 2000 Annals of Botany Company

C-values, genome size, gymnosperms, conifers, Pinus spp., latitudinal variation, megagametophytes


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