Abstract
Formation of the pollination drop (PD) in Juniperus communis, and the response to deposition of con- specific pollen and other particulate material is described. The PD persisted for about 12 days if not pollinated, and formed again after removal for up to four consecutive days. After pollination with viable conspecific pollen the PD retracted quickly and did not form again. Partial withdrawal occurred after deposition of other biological and non- biological material. These results suggest that there is an aspecific mechanism, particle size dependent, that induces partial PD withdrawal. Complete PD withdrawal is presumably under the control of a biochemical molecular mechanism triggered only by viable conspecific pollen.
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