KNAW Repository

Intraspecific competition and mating between fungal strains of the anther smut Microbotryum violaceum from the host plants Silene latifolia and S-dioica.

Van Putten, W.F. and Biere, A. and Van Damme, J.M.M. (2003) Intraspecific competition and mating between fungal strains of the anther smut Microbotryum violaceum from the host plants Silene latifolia and S-dioica. Evolution, 57, 766-776. ISSN 0014-3820.

[img]PDF - Published Version
Restricted to KNAW only

488Kb

Official URL: http://dx.doi.org/10.1111/j.0014-3820.2003.tb00288.x

Abstract

We studied intraspecific competition and assortative mating between strains of the anther smut fungus Microbotryum violaceum from two of its host species, Silene latifolia and S. dioica. Specifically, we investigated whether strains from allopatric host populations have higher competitive ability on their native host species and show positive assortative mating. In general, strains isolated from S. latifolia outcompeted strains isolated from S. dioica on both host species, but in female hosts, heterotypic dikaryons (i.e., dikaryons composed of a haploid strain originating from S. latifolia and a haploid strain originating from S. dioica) were most successful in competition. Furthermore, the latency period was significantly shorter for heterokaryons that contained at least one strain originating from S. latifolia, compared to heterokaryons that only contained strains originating from S. dioica. The frequencies of conjugations between strains originating from S. latifolia were much higher than conjugation frequencies between strains originating from S. dioica. A significant positive correlation was detected between the relative success of strains in competition and in conjugation, suggesting that success of a strain in competition might be partly determined by its swiftness of mating. In addition, reciprocal differences within heterotypic crosses revealed a significant effect of fungal mating type, with mating type a1 being the main determinant of mating pace. The observed differences in infection success, conjugation rate, and latency period in favor of strains from S. latifolia relative to strains from S. dioica on both host species are discussed in an evolutionary context of opportunities for the maintenance of differentiation between different formae speciales upon secondary contact [KEYWORDS: Competition success, conjugation, formae speciales, mating success, mating type, smut fungus]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11427
Deposited On:24 Nov 2011 01:00
Last Modified:31 Mar 2014 10:32

Repository Staff Only: item control page