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), 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: ulcerate, polarity: heteropolar, P/E-ratio: -, shape: spheroidal, outline in polar view: circular, dominant orientation (LM): -, P/E-ratio (dry pollen): -, 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
LM ornamentation LM: scabrate, nexine: -, sexine: -, SEM ornamentation SEM: microverrucate, suprasculpture SEM: -, TEM tectum: eutectate, infratectum: columellate, foot layer: continuous, endexine: absent, intine: monolayered, wall peculiarities: -, supratectal element: -
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
1. flowers of Avena sativa
2. flowers of Avena sativa
3. upper focus
4. optical section
5. lower focus
6. pollen grain with vegetative nucleus and two sperm cells
7. pollen grains in anther
8. hydrated pollen grain
9. aperture
10. exine surface
11. dry pollen grains
12. Ubisch bodies on inner anther wall
13. interapertural area of pollen wall
14. interapertural area of pollen wall
15. apertural area of pollen wall
16. vegetative nucleus (left) and sperm cell (right)
Picture legend
- flowers of Avena sativa, photographer: Sam, S.
- flowers of Avena sativa, photographer: Sam, S.
- upper focus - fresh, acetolyzed, unstained, photographer: Sam, S.
- optical section - fresh, acetolyzed, unstained, photographer: Sam, S.
- lower focus - fresh, acetolyzed, unstained, photographer: Sam, S.
- pollen grain with vegetative nucleus and two sperm cells - fresh, unfixed, aceto-carmine, photographer: Sam, S.
- pollen grains in anther - fresh, DMP & critical point dried, photographer: Sam, S.
- hydrated pollen grain - fresh, DMP & critical point dried, photographer: Halbritter, H.
- aperture - fresh, DMP & critical point dried, photographer: Halbritter, H.
- exine surface - fresh, DMP & critical point dried, photographer: Halbritter, H.
- dry pollen grains - dry, sputter coated with gold, photographer: Halbritter, H.
- Ubisch bodies on inner anther wall - fresh, DMP & critical point dried, photographer: Sam, S.
- interapertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
- interapertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
- apertural area of pollen wall - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
- vegetative nucleus (left) and sperm cell (right) - fresh, glutaraldehyde & osmium & potassium ferrocyanide, modified Thiéry-test, photographer: Sam, S.
Literature
- (1994) Exkursionsflora von Österreich : 1180
- (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; accessed 2024-11-10