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PalDat - Palynological Database

an online publication on recent pollen

Avena sativa

Taxonomy: Angiospermae, Poales, Poaceae, Avena

Published: 2016-08-08

Pollen Description

Shape, Size and Aperture

pollen unit: monad,  dispersal unit and peculiarities: monad,  size (pollen unit): medium-sized (26-50 µm),  pollen class: ulcerate,  polarity: heteropolar,  shape: spheroidal,  outline in polar view: circular,  shape (dry pollen): irregular,  outline in polar view (dry pollen): irregular,  infoldings (dry pollen): irregularly infolded,  aperture number: 1,  aperture type: ulcus,  aperture condition: ulcerate,  aperture peculiarities: operculum, annulus

Ornamentation and Structure

LMornamentation LM: scabrate,  nexine: -,  sexine: -,  SEMornamentation SEM: microverrucate,  TEMtectum: eutectate,  infratectum: columellate,  foot layer: continuous,  endexine: absent,  intine: monolayered,  wall peculiarities: -

Miscellaneous

pollen coatings: absent,  reserves in cytoplasm: starch, polysaccharide vesicles,  cell number: 3-celled,  Ubisch bodies: present

Annotations

tectum, infratectum and footlayer with channels; distal pole wider then proximal pole

Author(s) of diagnosis: Halbritter, Heidemarie; Sam, Saskia

Pictures

flowers of Avena sativa

1. flowers of Avena sativa

flowers of Avena sativa

2. flowers of Avena sativa

upper focus

3. upper focus

optical section

4. optical section

lower focus

5. lower focus

pollen grain with vegetative nucleus and two sperm cells

6. pollen grain with vegetative nucleus and two sperm cells

pollen grains in anther

7. pollen grains in anther

hydrated pollen grain

8. hydrated pollen grain

aperture

9. aperture

exine surface

10. exine surface

dry pollen grains

11. dry pollen grains

Ubisch bodies on inner anther wall

12. Ubisch bodies on inner anther wall

interapertural area of pollen wall

13. interapertural area of pollen wall

interapertural area of pollen wall

14. interapertural area of pollen wall

apertural area of pollen wall

15. apertural area of pollen wall

vegetative nucleus (left) and sperm cell (right)

16. vegetative nucleus (left) and sperm cell (right)

Picture legend

  1. flowers of Avena sativa, photographer: Sam, S.
  2. flowers of Avena sativa, photographer: Sam, S.
  3. upper focus - fresh, acetolyzed, unstained, photographer: Sam, S.
  4. optical section - fresh, acetolyzed, unstained, photographer: Sam, S.
  5. lower focus - fresh, acetolyzed, unstained, photographer: Sam, S.
  6. pollen grain with vegetative nucleus and two sperm cells - fresh, unfixed, aceto-carmine, photographer: Sam, S.
  7. pollen grains in anther - fresh, DMP & critical point dried, photographer: Sam, S.
  8. hydrated pollen grain - fresh, DMP & critical point dried, photographer: Halbritter, H.
  9. aperture - fresh, DMP & critical point dried, photographer: Halbritter, H.
  10. exine surface - fresh, DMP & critical point dried, photographer: Halbritter, H.
  11. dry pollen grains - dry, sputter coated with gold, photographer: Halbritter, H.
  12. Ubisch bodies on inner anther wall - fresh, DMP & critical point dried, photographer: Sam, S.
  13. interapertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
  14. interapertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
  15. apertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
  16. vegetative nucleus (left) and sperm cell (right) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.

Literature

  • Adler W, Oswald K, Fischer R. (1994) Exkursionsflora von Österreich : 1180
  • 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:

Halbritter H., Sam S. 2016. Avena sativa. In: PalDat - A palynological database. https://www.paldat.org/pub/Avena_sativa/301284;jsessionid=09E5F6930254AF7591D7041268521852; accessed 2018-11-18

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