Pollen and Pistil Effects on Pollen Germination and Tube Growth in Selfing and Outcrossing Populations of Clarkia Tembloriensis (Onagraceae) and Their Hybrids

Pollen tubes grow more rapidly in plants from an outcrossing population of Clarkia tembloriensis (Idria-2) than in plants from a selfing population (Cantua Creek-2). To determine if the observed differences were the result of characteristics of the pollen or the pistil, a series of single-donor poll...

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Bibliographic Details
Published in:International journal of plant sciences 2000-11, Vol.161 (6), p.895-902
Main Authors: Kerwin, Maureen A., Smith-Huerta, Nancy L.
Format: Article
Language:English
Subjects:
Flowers & plants
Plant reproduction
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Summary:Pollen tubes grow more rapidly in plants from an outcrossing population of Clarkia tembloriensis (Idria-2) than in plants from a selfing population (Cantua Creek-2). To determine if the observed differences were the result of characteristics of the pollen or the pistil, a series of single-donor pollinations were made between growth chamber-grown plants from the two populations and their hybrids. Cantua Creek-2 pollen germinated the fastest on most stigma types, whereas Idria-2 pollen grew fastest through most style types. Pollen tube growth rates for all pollen types were significantly slower through Cantua Creek-2 styles than through Idria-2 and hybrid styles. Idria-2 styles contained the most pollen tubes, and Cantua Creek-2 contained the fewest pollen tubes for all pollen types. Hence, pollen germination rates were most influenced by pollen type, whereas average number of tubes in the style was most influenced by pistil type. Pollen tube growth rates appear to be influenced by both pollen source and pistil type.
ISSN:1058-5893
1537-5315
DOI:10.1086/317564