The State Museum, State Library and State Archives are temporarily Closed.

Diurnal Patterns of Pollen Emission in Ambrosia, Phleum, Zea, and Ricinus

TitleDiurnal Patterns of Pollen Emission in Ambrosia, Phleum, Zea, and Ricinus
Publication TypeJournal Article
Year of Publication1969
AuthorsOgden, EC, Hayes, JV
JournalAmerican Journal of Botany
Volume56
Pagination16-21
Keywordsbiology
Abstract
Hourly measu rements of pollen emission were made from cultivated plots of Ambrosia, Phleum, Zea, and Ricinus over the course of several pollination seasons as part of a study of pollen dispersion from known sources. A characteristic diurnal emission pattern was found for each genus Ambrosia pollen emission normally begins an hour or two after sunrise, peaks a few hours later, and decreases through the afternoon. Phleum starts during the night, peaks about 2 hr after sunrise, and declines slowly through the day. Zea emits pollen fairly uniformly during the period from 2 hr after sunrise to about sunset, while Ricinus pollen was collected from several hours after sunrise to late afternoon with a peak in mid-morning. Daily patterns often vary from the seasonal mean in response to changing meteorological conditions.
URLhttp://www.jstor.org/stable/2440389