Abstract
Ribosomal gene compensation and magnification that might be detected on a whole-plant basis was not found in maize. Plants monosomic for chromosome 6 (the NOR chromosome) were compared with monosomic-8 and monosomic-10 plants, disomic sibs, and parental lines. Assuming no rDNA compensation, monosomic-6 plants showed approximately the decrease expected in rRNA cistron number. Monosomic-8 had a normal ribosomal gene number, while monosomic-10 showed a decrease; but further documentation is needed. Besides demonstrating the absence of gene compensation, the results document our previous conclusion that maize chromosome 6 carries DNA complementary to ribosomal RNA. Further documentation was provided from studies with trisomic chromosome 6 plants showing proportional increases in ribosomal gene number. Progeny of the monosomic plants crossed as males to a standard singlecross hybrid possessed expected ribosomal gene numbers suggesting the lack of ribosomal gene magnification.-The ragged (rgd) mutant of maize, suspected of being deficient in rRNA cistrons, had a normal number.
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Claims 8
Claim · model-written summary
Whole-plant ribosomal gene compensation and magnification were absent.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribosomal gene compensation and magnification that might be detected on a whole-plant basis was not found in maize”
t0“MAIZE (ZEA MAYS L.)”
Claim · model-written summary
Monosomic-6 plants showed approximately the expected reduction in rRNA cistron number.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“monosomic-6 plants showed approximately the decrease expected in rRNA cistron number”
e1“not found in maize”
Claim · model-written summary
Monosomic-8 plants had normal ribosomal gene number.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Monosomic-8 had a normal ribosomal gene number”
e1“not found in maize”
Claim · model-written summary
Monosomic-10 plants showed a ribosomal gene number decrease requiring further documentation.
- Material
- monosomic-10e0
- Outcome
- ribosomal gene numbere2
- Direction
- decreasee0
- Qualifier
- further documentation is needede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“monosomic-10 showed a decrease; but further documentation is needed”
e1“not found in maize”
e2“normal ribosomal gene number”
Claim · model-written summary
Maize chromosome 6 carries DNA complementary to ribosomal RNA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize chromosome 6 carries DNA complementary to ribosomal RNA”
Claim · model-written summary
Trisomic chromosome 6 plants had proportional increases in ribosomal gene number.
- Material
- trisomic chromosome 6 plantse0
- Outcome
- ribosomal gene numbere0
- Direction
- proportional increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“trisomic chromosome 6 plants showing proportional increases in ribosomal gene number”
e1“not found in maize”
Claim · model-written summary
Progeny from monosomic male crosses had expected ribosomal gene numbers.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progeny of the monosomic plants crossed as males to a standard singlecross hybrid possessed expected ribosomal gene numbers suggesting the lack of ribosomal gene magnification”
e1“not found in maize”
Claim · model-written summary
The ragged mutant had a normal rRNA cistron number.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ragged (rgd) mutant of maize, suspected of being deficient in rRNA cistrons, had a normal number”