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A method to estimate pollen viability from pollen size variation¹

Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Ave., Lawrence, Kansas 66045 USA; Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 USA

The mean diameter of viable pollen grains is approximately 13 µm greater than the mean diameter of inviable grains in Mimulus guttatus. We show that this difference is large enough to be detected by particle counters and that these machines can be used to obtain a rapid estimate of pollen viability. While requiring a separate calibration, a size-based statistic is also strongly correlated with pollen viability in Collinsia verna. These results suggest that statistics derived from the size distribution of pollen grains may provide an alternative to more labor-intensive methods for estimating pollen viability, particularly in cases where inviability results from inbreeding depression or hybrid failure.

Key Words: Collinsia • inbreeding • Mimulus • particle counters • pollen viability

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