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Diversity of S-alleles and mate availability in 3 populations of self-incompatible wild pear (Pyrus pyraster)

journal contribution
posted on 10.02.2021, 23:15 by Susan Hoebee, S Angelone, D Csencsics, K Määttänen, R Holderegger
Small populations of self-incompatible plants may be expected to be threatened by the limitation of compatible mating partners (i.e., S-Allee effect). However, few empirical studies have explicitly tested the hypothesis of mate limitation in small populations of self-incompatible plants. To do so, we studied wild pear (Pyrus pyraster), which possesses a gametophytic self-incompatibility system. We determined the S-genotypes in complete samplings of all adult trees from 3 populations using a PCR-RFLP approach. We identified a total of 26 different S-alleles, homologous to S-alleles of other woody Rosaceae. The functionality of S-alleles and their Mendelian inheritance were verified in artificial pollination experiments and investigations of pollen tube growth. The smallest population (N = 8) harbored 9 different S-alleles and showed a mate availability of 92.9%, whereas the 2 larger populations harbored 18 and 25 S-alleles and exhibited mate availabilities of 98.4% and 99.2%, respectively. Therefore, we conclude that even small populations of gametophytic self-incompatible plants may exhibit high diversity at the S-locus and are not immediately threatened owing to reduced mate availability. © The American Genetic Association. 2011. All rights reserved.

Funding

Swiss Agency for the Environment BAFU (project "Protection and Use of Forest Genetic Resources'').

History

Publication Date

01/03/2012

Journal

Journal of Heredity

Volume

103

Issue

2

Pagination

(p. 260-267)

Publisher

OXFORD UNIV PRESS INC

ISSN

0022-1503

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