Variation in pollen viability among Picea abies genotypes – potential for unequal paternal success |
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Authors: | T Nikkanen T Aronen H Häggman M Venäläinen |
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Institution: | (1) Punkaharju Research Station, FIN-58450 Punkaharju, Finland e-mail: teijo.nikkanen@metla.fi Tel.: +358-15-730 220, Fax: +358-15-644 333, FI |
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Abstract: | An in vitro germination method was used to study variation in pollen viability, that is pollen-tube growth rate together with
germination percentage, among the Picea abies genotypes in a seed orchard. The method permits easy, rapid screening of large numbers of genotypes. Significant variation
in pollen viability among the genotypes was evident, the differences among the pollen-lot means being 7–10–fold in different
years. No correlation was found between the average pollen viability and the phenology, growth or growing-site characteristics
of the pollen donors. However, there appeared to be pollen lots that either benefit from a higher germination temperature
or else germinate faster at lower temperatures. The significant variation in pollen viability among the pollen donors indicates
a potential for male gametophyte competition. This, together with the observed genotype-environment interactions in pollen
performance, may contribute to the variable genetic composition of seed produced in the seed orchard.
Received: 9 December 1999 / Accepted: 22 December 1999 |
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Keywords: | Norway spruce Pollination Germination of pollen Pollen-tube growth Functioning of seed orchard |
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