Geranium robertianum
Taxonomy: Angiospermae, Geraniales, Geraniaceae, Geranium
Published: 2016-09-26
Pollen Description
Shape, Size and Aperture
pollen unit: monad, dispersal unit and peculiarities: monad, size (pollen unit): medium-sized (26-50 µm), size of hydrated pollen (LM): -, shortest polar axis in equatorial view (LM): -, longest polar axis in equatorial view (LM): -, shortest diameter in equatorial or polar view (LM): -, longest diameter in equatorial or polar view (LM): -, pollen class: colporate, polarity: isopolar, P/E-ratio: oblate, shape: -, outline in polar view: circular, dominant orientation (LM): -, P/E-ratio (dry pollen): prolate, shape (dry pollen): -, outline in polar view (dry pollen): circular, infoldings (dry pollen): aperture(s) sunken, aperture number: 3, aperture type: colporus, aperture condition: tricolporate, colporate, aperture peculiarities: -
Ornamentation and Structure
LM ornamentation LM: clavate, reticulate, nexine: -, sexine: -, SEM ornamentation SEM: clavate, reticulate, suprasculpture SEM: -, TEM tectum: semitectate, infratectum: columellate, foot layer: perforate, endexine: absent, intine: monolayered, wall peculiarities: -, supratectal element: -
Miscellaneous
pollen coatings: pollen coating vesicles, pollenkitt, reserves in cytoplasm: starch, cell number: 3-celled, Ubisch bodies: absent
Annotations: bubble-like apertural intine protrusions containing starch grains; starch grains in apertural chambers not involved in pollen tube growth
Author(s) of diagnosis: Weber, Martina; Halbritter, Heidemarie
Pictures
1. flower(s)
2. germinating pollen grains on stigma
3. polar view, starch grains in cytoplasm and apertural protrusions
4. polar view
5. exine surface
6. bubble-like protrusion at the aperture
7. pollen wall with perforated footlayer, exine cavities filled with pollen coating vesicles (PCV)
8. pollen wall coated with pollenkitt and pollen coating vesicles (PCV)
Picture legend
- flower(s), photographer: Halbritter, H.
- germinating pollen grains on stigma - fresh, unfixed, iodine, photographer: Weber, M.
- polar view, starch grains in cytoplasm and apertural protrusions - fresh, unfixed, iodine, photographer: Weber, M.
- polar view - fresh, critical point dried & sputter coated with gold, photographer: Halbritter, H.
- exine surface - fresh, critical point dried & sputter coated with gold, photographer: Halbritter, H.
- bubble-like protrusion at the aperture - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.
- pollen wall with perforated footlayer, exine cavities filled with pollen coating vesicles (PCV) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.
- pollen wall coated with pollenkitt and pollen coating vesicles (PCV) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.
Literature
- (1996) Apertural chambers in Geranium: development and ultrastructure. Sex Pl Reprod 9: 102-109
- (1996) The existence of a special exine coating in Geranium robertianum pollen. Int J Plant Sci 157: 195-202
- (1998) Preparing living pollen material for scanning electron microscopy using 2,2-dimethoxypropane (DMP) and criticalpoint drying. Biotechnic Histochem 73: 137–143
Copyright and Citation
Cite this publication as:
Weber M., Halbritter H. 2016. Geranium robertianum. In: PalDat - A palynological database. https://pc8.botanik.univie.ac.at/pub/Geranium_robertianum/301452; accessed 2025-04-28