|Copyright: Volkan Eroglu (Gramineae)
|Date Taken: 2011-02-16|
|Exposure: f/18.0, 1/200 seconds|
|More Photo Info: [view]|
|Photo Version: Original Version|
|Date Submitted: 2011-02-18 3:53|
|[Note Guidelines] Photographer's Note|
|Secondary pollen presentation is one of the most important mechanism for biodiversity. This mechanism works as follows for Leontodon sp.: |
Flowers are protandrous. In bud, the introse anthers form a closed cylinder around the immature style. As they dehisce in the bud stage, their pollen is discharged and deposited onto the dense brush of unicellular collecting hairs. Before the flowers opening, corolla increasingly narrow and stamens touches the style. The two branches of the stigma remain unexpanded but are fully formed. Close to and just after opening, the flower is in the male phase. A rapid elongation of the lower part of the style causes the collecting hairs at the distal end to sweep up the pollen The anthers then wither and remain inconspicuous at the lower part of the flower. Thus, pollen is presented secondarily (i.e. not by the anthers themselves) to potential visitors.Then, hairs on stillus are poured out and pollen received surface is exposed. Stillus is splited in proportion to two to five and stigma is exposed. After this stage, male-phase of flowers was over and female phase began. Stigma lopes start accepting pollen grains to the papillate surface.
My observation notes in Ege University Botanical Garden.
maaciejka has marked this note useful
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- v4vjk (51)
- [2011-02-18 4:39]
nice photo of this flower and insect - wasp?? Good sharpness and amazing colours of both.
Thanks for sharing.
Ciao Volkan, lovely busy bee on a yellow beauty, splendid sharpness, fine details and wonderful colors, very well done my friend, have a good week end, ciao Silvio
For me this image deserves my two points. Very good indeed. Neels