Pollen precedence and stigma closure: a mechanism of competition for pollination between Delphinium nelsonii and Ipomopsis aggregata View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1986-11

AUTHORS

Nickolas M. Waser, Michael L. Fugate

ABSTRACT

Previous experiments showed that the sympatric herbs Delphinium nelsonii and Ipomopsis aggregata compete for hummingbird pollination and that deleterious effects of the former species on seed set of the latter involve interspecific pollen transfer. However, seed set was not reduced when pollen of both species was applied simultaneously to I. aggregata stigmas. Hence a competitive effect may require arrival of foreign pollen before conspecific pollen. To explore this possibility we subjected I. aggregata flowers to a “competition” treatment in which they received D. nelsonii pollen 6 h before I. aggregata pollen, or to a “control” in which they received only the conspecific pollen. Foreign pollen precedence decreased mean seed set by almost 50%, which is consistent with effects observed in previous experiments. Reduced seed set can be explained by the fact that foreign pollen often caused stigma lobes to close together within 1.5–6 h, reducing subsequent receptivity. Stigma closure was also elicited by conspecific pollen, but not by mechanical stimulation, and was influenced by size of the pollen load and identity of the plant being pollinated. More... »

PAGES

573-577

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00379906

DOI

http://dx.doi.org/10.1007/bf00379906

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032874039

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28311501


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