Flotation preferentially selects saccate pollen during conifer pollination.

Abstract

• Among many species of living conifers the presence of pollen with air bladders (saccate pollen) is strongly associated with downward-facing ovules and the production of pollination drops. This combination of features enables saccate pollen grains captured in the pollination drop to float upwards into the ovule. Despite the importance of this mechanism in… (More)
DOI: 10.1111/j.1469-8137.2010.03356.x

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