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An Oil Drop Theory of Pollen-Grain Pattern Formation

R. P. Wodehouse
American Journal of Botany
Vol. 21, No. 1 (Jan., 1934), pp. 18-22
Stable URL: http://www.jstor.org/stable/2436159
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
An Oil Drop Theory of Pollen-Grain Pattern Formation
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Abstract

The theory is here advanced that as pollen grains develop they absorb the aqueous phase of the oily emulsion by which they are surrounded, and the oil is consequently thrown out of suspension and is condensed in droplets upon the surface of the grains. These droplets, since they are separated from each other by a viscous aqueous solution, assume a least-surface configuration, which, however, is somewhat modified and controlled in spatial orientation by such contours of the grains as may be due to their three or more pores and furrows. With oil drops so arranged upon their surface, the deposition of the material of the outer layer upon the pollen grains can take place only between the oil droplets, consequently this material is built up in a pattern corresponding to the configuration of their interstices.

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