Research output

Article in Journal ()

Partial interfertility between independently originated populations of the neo-allopolyploid Mimulus peregrinus

Alternative title Interfertility of independently originated allopolyploid populations

Citation
Vallejo-Marin M, Quenu M, Ritchie S & Meeus S (2017) Partial interfertility between independently originated populations of the neo-allopolyploid Mimulus peregrinus, Plant Systematics and Evolution, 303 (8), pp. 1081-1092.

Abstract
The reduction in genetic diversity in polyploid lineages, formed from whole-genome duplication of a few individuals, can affect their long-term evolutionary potential. Because most polyploids originate multiple times, secondary contact and gene exchange among independently formed polyploids can create novel genetic combinations and reduce the severity of genetic bottlenecks. However, independently originated polyploids may be reproductively isolated from each other due to genetic and chromosomal differences predating the polyploidisation event, or evolving subsequently in the dynamic genomes of young polyploid populations. Here we conducted experimental crosses to investigate the phenotype and interfertility between two independently originated populations of the allopolyploid Mimulus peregrinus (Phrymaceae). We found that individuals from the two populations are phenotypically distinct, but that inter- and intrapopulation crosses are not statistically different. Interpopulation crosses produce viable and fertile offspring, although our results suggest the existence of partial reproductive barriers in the form of reduced pollen viability. We found no difference in pollen viability between F1 and F2 generations. In contrast, we detected a reduction in floral and vegetative size, and in the proportion of plants that flowered, between F1 and F2 generations for both intra- and interpopulation crosses. Together, our results indicate that populations of independent origin can partially exchange genes, producing variable offspring, and that the phenotype of M. peregrinus may be unstable in the early generations. Natural selection on genetically-based variation may be required for the evolution of more stable and fertile individuals of this nascent allopolyploid.

Keywords
Hybridisation; Mimulus; non-native species; reproductive barriers; speciation; whole-genome duplication.

StatusPublished
AuthorsVallejo-Marin Mario, Quenu Mathieu, Ritchie Stuart, Meeus Sofie
Publication date10/2017
Publication date online07/06/2017
Date accepted by journal04/05/2017
PublisherSpringer
ISSN 0378-2697
LanguageEnglish

Journal
Plant Systematics and Evolution: Volume 303, Issue 8

© University of Stirling FK9 4LA Scotland UK • Telephone +44 1786 473171 • Scottish Charity No SC011159
My Portal