POSTPOLLINATION PHENOMENA IN ORCHID FLOWERS. V. PARTICIPATION BY THE ROSTELLUM AND GYNOSTEMIUM TIP |
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| Authors: | Joseph Arditti Brigitta H Flick |
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| Institution: | Department of Developmental and Cell Biology, University of California, Irvine, 92664 |
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| Abstract: | Removal of the rostellum following pollination does not prevent stigmatic closure in Cymbidium flowers and has a minimal effect on straightening of the gynostemium (column). However, this treatment does depress anthocyanin levels in both gynostemia and labella. Excision of the rostellum 30 or 60 min after pollination has a more pronounced effect than removal after 150 min. Stigmatic closure is not inhibited by removal of the gynostemium tip, but column swelling is reduced. These findings are discussed relative to rostellar functions and theories regarding their origin. |
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