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Annals of Botany 85: 69-76, 2000
© 2000 Annals of Botany Company

Variation of Nuclear DNA Content in the Biflorus Species of Lonchocarpus (Leguminosae)

GUADALUPE PALOMINO+ and S. MARIO SOUSA

Jardín Botánico, Instituto de Biología, Universidad Nacional Autónoma de México, México, D.F., México Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, México, D.F., México

April 20, 1999 ; May 28, 1999 . September 20, 1999

This represents the first study of nuclear DNA content in a large sample (135 spp.) from a tropical arboreal genus, in which a large proportion of the species were examined (42 spp., 31.1%). Somatic chromosome numbers and 4C-DNA values for 51 taxa of Lonchocarpus are reported. All taxa were diploid with 2 n =22, but their DNA content ranged from 1.92 to 2.86 pg 4C nucleus, corresponding to a 48.95% variation in genome size. In the 74 collections studied, no correlation was observed between DNA content and habitat altitude. Variation in nuclear DNA content was analysed at the level of genus, subgenus, section and subsection. Variation in genome size was also studied within some species, either among widely separated populations or among different intraspecific taxa. Very little variation in genome size was detected between populations, subspecies, and varieties of the same species. The taxonomic implications of variation in nuclear DNA content are discussed.Copyright 2000 Annals of Botany Company

Lonchocarpus (Leguminosae), DNA content, chromosome number.


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