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PalDat - Palynological Database

an online publication on recent pollen

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),  pollen class: colporate,  polarity: isopolar,  shape: oblate,  outline in polar view: circular,  shape (dry pollen): prolate,  outline in polar view (dry pollen): circular,  infoldings (dry pollen): aperture(s) sunken,  aperture number: 3,  aperture type: colporus,  aperture condition: colporate, tricolporate,  aperture peculiarities: -

Ornamentation and Structure

LMornamentation LM: reticulate, clavate,  nexine: -,  sexine: -,  SEMornamentation SEM: reticulate, clavate,  TEMtectum: semitectate,  infratectum: columellate,  foot layer: perforate,  endexine: absent,  intine: monolayered,  wall peculiarities: -

Miscellaneous

pollen coatings: pollenkitt, pollen coating vesicles,  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

flower(s)

1. flower(s)

germinating pollen grains on stigma

2. germinating pollen grains on stigma

polar view,starch grains in cytoplasm and apertural protrusions

3. polar view, starch grains in cytoplasm and apertural protrusions

polar view

4. polar view

exine surface

5. exine surface

bubble-like protrusion at the aperture

6. bubble-like protrusion at the aperture

pollen wall with perforated footlayer,exine cavities filled with pollen coating vesicles (PCV)

7. pollen wall with perforated footlayer, exine cavities filled with pollen coating vesicles (PCV)

pollen wall coated with pollenkitt and pollen coating vesicles (PCV)

8. pollen wall coated with pollenkitt and pollen coating vesicles (PCV)

Picture legend

  1. flower(s), photographer: Halbritter, H.
  2. germinating pollen grains on stigma - fresh, unfixed, iodine, photographer: Weber, M.
  3. polar view, starch grains in cytoplasm and apertural protrusions - fresh, unfixed, iodine, photographer: Weber, M.
  4. polar view - fresh, critical point dried & sputter coated with gold, photographer: Halbritter, H.
  5. exine surface - fresh, critical point dried & sputter coated with gold, photographer: Halbritter, H.
  6. bubble-like protrusion at the aperture - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.
  7. pollen wall with perforated footlayer, exine cavities filled with pollen coating vesicles (PCV) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.
  8. pollen wall coated with pollenkitt and pollen coating vesicles (PCV) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Weber, M.

Literature

  • Weber M (1996) Apertural chambers in Geranium: development and ultrastructure. Sex Pl Reprod 9: 102-109
  • Weber M (1996) The existence of a special exine coating in Geranium robertianum pollen. Int J Plant Sci 157: 195-202
  • Halbritter, H (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://www.paldat.org/pub/Geranium_robertianum/301452;jsessionid=4565F98CACABE2E97F389FAB4D79804C; accessed 2018-11-13

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