Abstract
Scanning electron microscopy and X-ray microanalysis of the ventral leaves of Selaginella emmeliana demonstrated high levels of silicon in the marginal sclereids and about one-half the abaxial epidermal cells. Although both of these cell types bear rows of knobs or warts on the outer tangential wall, the X-ray spectra indicate that silicon is distributed throughout the wall and that it is not concentrated in these projections. In S. emmeliana, stomata are confined to a band of low silicon cells overlying the midrib on the abaxial side of the leaf. A small proportion of these stomata also contain high levels of silicon and are characterized by a constricted stomatal aperture. A preliminary survey of three other species of Selaginella indicates that accumulation of silicon in the leaf epidermis is characteristic for each.
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Claims 5
Claim · model-written summary
Silicon was high in marginal sclereids and about half the abaxial epidermal cells.
Verbatim
e0“ventral leaves of Selaginella emmeliana demonstrated high levels of silicon in the marginal sclereids and about one-half the abaxial epidermal cells.”
Claim · model-written summary
Silicon was distributed throughout the wall rather than concentrated in knobs or warts.
Verbatim
e0“silicon is distributed throughout the wall and that it is not concentrated in these projections.”
t0“Selaginella emmeliana”
Claim · model-written summary
Stomata were confined to a low-silicon band over the abaxial midrib.
Verbatim
e0“In S. emmeliana, stomata are confined to a band of low silicon cells overlying the midrib on the abaxial side of the leaf.”
Claim · model-written summary
A small proportion of stomata had high silicon and constricted apertures.
Verbatim
e0“A small proportion of these stomata also contain high levels of silicon and are characterized by a constricted stomatal aperture.”
t0“Selaginella emmeliana”
Claim · model-written summary
Leaf epidermal silicon accumulation characterized each of three other Selaginella species.
- Taxon
- Selaginella
Selaginellae0 - Outcome
- accumulation of silicon in the leaf epidermis is characteristic for eache0
- Qualifier
- three other speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A preliminary survey of three other species of Selaginella indicates that accumulation of silicon in the leaf epidermis is characteristic for each.”