Abstract
An apparatus is described enabling light responses of wheat stomata to be followed by periodical porometer readings, between which the substomatal cavities can be swept with carbon dioxide-free air forced in through the stomata. This is held to eliminate the influence of changes in the carbon dioxide content of the intercellular space atmosphere brought about by photosynthesis and respiration in the mesophyll. Using this apparatus in an experiment of ‘Latin square’ design with 6-fold replication of three light treatments, a statistically significant response to light was found in a leaf area subjected to varying light intensities from 90 to 800 f.c. This response was reflected in a similar significant effect, though of smaller magnitude, occurring in a similarly swept ‘control’ area 2 cm. distant and maintained at a constant light intensity of 270 f.c, the intervening portion of leaf being illuminated with 800 f.c. throughout. It is argued that this transmission of a light effect from one area to another does not occur via the intercellular spaces, nor by means of carbon dioxide gradients from cell to cell. It is concluded from the data that there is an indirect effect of light and perhaps also a direct effect upon the guard cells themselves; it is probable that neither of the two effects concerned operates by reduction of the internal carbon dioxide content in the guard cells.
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Claims 6
Claim · model-written summary
A porometer apparatus permitted light responses of wheat stomata to be followed while cavities were swept with carbon dioxide-free air.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- light responses of wheat stomatae0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An apparatus is described enabling light responses of wheat stomata to be followed by periodical porometer readings, between which the substomatal cavities can be swept with carbon dioxide-free air forced in through the stomata”
Claim · model-written summary
Wheat stomata responded significantly to light intensity variation from 90 to 800 f.c.
- Taxon
- wheatTriticum aestivume1
- Treatment
- varying light intensities from 90 to 800 f.ce0
- Outcome
- response to lighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a statistically significant response to light was found in a leaf area subjected to varying light intensities from 90 to 800 f.c”
e1“wheat stomata”
Claim · model-written summary
A swept control leaf area 2 cm away showed a significant light response of smaller magnitude under constant illumination.
- Taxon
- wheatTriticum aestivume1
- Outcome
- significant effecte0
- Direction
- smaller magnitudee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar significant effect, though of smaller magnitude, occurring in a similarly swept ‘control’ area 2 cm. distant and maintained at a constant light intensity of 270 f.c”
e1“wheat stomata”
Claim · model-written summary
The authors inferred an indirect light effect on wheat stomata and possibly a direct effect on guard cells.
- Taxon
- wheatTriticum aestivume1
- Outcome
- indirect effect of lighte0
- Qualifier
- direct effect upon the guard cells themselvese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is an indirect effect of light and perhaps also a direct effect upon the guard cells themselves”
e1“wheat stomata”
Claim · model-written summary
The transmitted light effect was argued not to operate through intercellular spaces or cell-to-cell carbon dioxide gradients.
- Taxon
- wheatTriticum aestivume1
- Outcome
- transmission of a light effecte0
- Qualifier
- does not occur via the intercellular spaces, nor by means of carbon dioxide gradients from cell to celle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this transmission of a light effect from one area to another does not occur via the intercellular spaces, nor by means of carbon dioxide gradients from cell to cell”
e1“wheat stomata”
Claim · model-written summary
Neither proposed light effect probably operates by reducing internal guard-cell carbon dioxide.
- Taxon
- wheatTriticum aestivume1
- Outcome
- internal carbon dioxide content in the guard cellse0
- Qualifier
- neither of the two effects concerned operates by reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is probable that neither of the two effects concerned operates by reduction of the internal carbon dioxide content in the guard cells”
e1“wheat stomata”