Abstract
The epicuticular waxes of glumes of 357 samples, representing all the 27 species of the genus Avena. were examined under the scanning electron microscope. Three basic patterns were discerned, plates, knobs, and filaments, and each sample has been scored for the types found. A fourth category of unstructural pattern has also been scored. Variability within patterns was observed but not scored. It is concluded that epicuticular waxes on glumes in Avena cannot be used for identification of specimens to species except for various special cases when the choice to be made is between two or three alternatives. The main finding is that the degree of variability of the patterns is inversely proportional to the ploidy level. The hexaploid species consist almost exclusively of filaments: the other species have all the three basic patterns, with some species possessing a high proportion of only two patterns.
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Claims 5
Claim · model-written summary
Avena glume waxes showed plates, knobs and filaments.
- Outcome
- plates, knobs, and filamentse0
AvenaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three basic patterns were discerned, plates, knobs, and filaments”
t0“Avena”
Claim · model-written summary
Wax patterns generally cannot identify Avena species.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“epicuticular waxes on glumes in Avena cannot be used for identification of specimens to species except for various special cases when the choice to be made is between two or three alternatives”
Claim · model-written summary
Wax pattern variability declined as ploidy increased.
- Outcome
- degree of variability of the patternse0
- Direction
- inversely proportionale0
- Comparator
- ploidy levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“degree of variability of the patterns is inversely proportional to the ploidy level”
t0“Avena”
Claim · model-written summary
Hexaploid species had almost exclusively filament wax patterns.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hexaploid species consist almost exclusively of filaments”
t0“Avena”
Claim · model-written summary
Other species showed all three basic wax patterns.
- Outcome
- all the three basic patternse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the other species have all the three basic patterns, with some species possessing a high proportion of only two patterns”
t0“Avena”