Pollen morphology and germination inNarcissus |
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Authors: | Spring Chen Rikizo Ueda |
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Institution: | (1) Department of Botany, University of Hong Kong, Hong Kong;(2) Institute of Biosciences, University of Tsukuba, Sakura-mura, 300-31 Ibaraki |
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Abstract: | Pollen grains of several species and varieties ofNarcissus were examined with a light microscope and a scanning electron microscope. Normal pollen grains were kidney- or spindle-shaped
with a germination furrow and a reticulate structure similar to that of the pollen grains ofAmaryllis.
Pollen grains germinated within 2 to 3 hr. Percentage of germination was dependent upon temperature and treatment. Pollen
tubes grew in length up to 1,000 μm and branched occasionally or behaved in strange fashion. Fresh pollen grains germinated
more in distilled water at lower temperature than in sucrose-aqueous medium. Both in the presence and in the absence of stigmatic
exudate calcium increased the percentage of germination. Gibberellic acid, abscisic acid and coumarin inhibited the pollen
germination.
Plasmoptysis occurred in all species and in all media tested except in a medium containing coumarin without stigmatic exudates.
Plasmoptysis did not seem to be induced by hypotonic medium alone. Pollen of high germination capacity showed a high percentage
of plasmoptysis.
Based on the results obtained, evolution and sterility of theNarcissus plant was discussed. |
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