Ecogeographic surveys as tools for analyzing potential reproductive isolating mechanisms: an example using Solanum juglandifolium Dunal, S. ochranthum Dunal, S. lycopersicoides Dunal, and S. sitiens I. M. Johnston

$17.42 plus tax (Refund Policy)

Buy Article:

Abstract:

An ecogeographic survey was completed for two pairs of South American Solanum species: (1) S. juglandifolium and S. ochranthum, and (2) S. lycopersicoides and S. sitiens. The purpose of this survey was to characterize the distribution, ecology, and phenology of these species and to screen for factors that might constitute premating reproductive isolating mechanisms between each pair. Passport data from 276 herbarium specimens were entered into a database, which was subsequently analyzed to determine the ecogeographic distribution and phenology of the surveyed species. The differences between species uncovered by the survey were then considered in the context of reproductive isolation. As S. juglandifolium and S. ochranthum were found to have overlapping ecogeographic preferences and phenology, it was postulated that postmating isolating mechanisms form the principal barrier to hybridization between the two species. Unlike S. juglandifolium and S. ochranthum, S. lycopersicoides and S. sitiens differed markedly in ecogeographic distribution. The species have been successfully crossed several times artificially, so the differences in distribution found in this survey probably contribute to maintaining species barriers between the two. In summary, this ecogeographic survey provided a useful method for analyzing the potential for interspecific gene flow between closely related taxa.

Keywords: ECOGEOGRAPHIC SURVEY; REPRODUCTIVE ISOLATING MECHANISMS; SOLANACEAE; SOLANUM; SOUTH AMERICA; SPECIATION

Document Type: Research Article

Affiliations: 1: Department of Botany, 132 Birge Hall, 430 Lincoln Drive, University of Wisconsin, Madison, Wisconsin 53706, U.S.A. 2: Department of Biological Sciences, National University of Cuyo, Alte. Brown 500, 5507 Chacras de Coria, Mendoza, Argentina

Publication date: May 1, 2002

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more