disk flower


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disk flower

[′disk ‚flau̇·ər]
(botany)
One of the flowers on the disk of a composite plant.
References in periodicals archive ?
We collected anthers from four disk flowers of the day from each head, macerated them together in a drop of stain on a microscope slide and counted presumably viable (dark blue and unshriveled) and non-viable (light blue and/or shriveled) grains at 100 X.
When the stigmas of the outer ring of disk flowers in each head were receptive, we began geitonogamy pollinations by gently transferring pollen to stigmas with toothpicks.
Skippers and butterflies remained stationary while they probed disk flowers with their proboscides.
However, the cross-pollinated heads had only 67% the number of disk flowers as open-pollinated heads.
Carefully selected plots with equal proportions of red disk and yellow disk flowers were used.
Finally, when offered a choice between an unmodified yellow disk aster and a sucrose enriched red disk aster, pollinators still preferred yellow disk flowers (Table 4).
The fact that the yellow disk asters offer significantly more viable pollen and are visited more often, if not exclusively, by insect pollinators than red disk asters begs the question of why old, inviable, red disk flowers are retained.
The consistent movement of pollinators to yellow disk flowers in our choice experiments may also reflect constancy in pollinator behavior.