Lankinen, Åsa
- Lund University
Abstract
In this study on Viola tricolor pollen, the competitive ability of 16 pollen donors originating from a wild population was analysed in a set of greenhouse and germination temperatures. The aim was to examine the consistency in donor pollen performance across temperatures and to see whether variation in performance was random or due to individual differences in the plastic response to temperature. Pollen tube growth rate in vitro was investigated in two greenhouse temperatures (on the day pollen was collected) and in four germination temperatures. In addition, pollen tube growth rate was assessed in vivo (in one temperature) to examine the relationship between in vivo and in vitro growth. A temperature difference of 5 K - corresponding to natural variation in time and space detected in the field - affected pollen tube growth rate. For both temperature components, significant pollen donor by temperature interactions were found and rank order of pollen donors changed across treatments. Although pollen competitive ability in violets was strongly influenced by both temperature components, the occurrence of pollen donor by temperature interactions indicates that donor siring ability varies with temperature. This, in turn, may suggest a means to maintain pollen competitive ability despite selection for this trait.
Keywords
gametophytic selection; genotype by environment interactions; phenotypic plasticity; pollen competition; pollen tube growth rate
Published in
Oecologia
2001, volume: 128, number: 4, pages: 492-498
Publisher: SPRINGER-VERLAG
SLU Authors
UKÄ Subject classification
Evolutionary Biology
Ecology
Genetics and Genomics
Publication identifier
- DOI: https://doi.org/10.1007/s004420100681
Permanent link to this page (URI)
https://res.slu.se/id/publ/42095