Claim · model-written summary
The twelve bivalents varied in size and shape in early diakinesis.
- Taxon
- Rice
Oryza sativat0 - Outcome
- Variation in size and shape of the 12 bivalent chromosomes is found in early diakinesis, one larger twisted pair being particularly noticeable.e0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variation in size and shape of the 12 bivalent chromosomes is found in early diakinesis, one larger twisted pair being particularly noticeable.”
t0“Rice”
Title
Cytological Investigations of Rice Varieties
H. K. Nandi CYTOLOGIA 1937. doi:10.1508/cytologia.8.277
Other claims from this paper (17)
- Observation Seven rice varieties had 12 haploid and 24 diploid chromosomes.
- Observation Satellites and secondary constrictions were absent from the rice chromosomes.
- Observation A chromosome pair with terminal knobs remained attached to nucleoli in somatic prophase.
- Observation Resting pollen mother-cell nuclei generally had one nucleolus without crystalline bodies.
- Observation The leptotene thread was split into two closely twisted chromonemata.
- Observation Nucleoli stayed connected to a chromosome pair from leptotene until metaphase.
- Observation Some nucleoli budded during synizesis, reaching equal size at early diakinesis.
- Observation Six rice varieties did not differ in nuclear and nucleolar size.
- Observation Nuclear diameter differed significantly between diakinesis cells with one and two nucleoli.
- Observation Only larger nucleoli budded after reaching maximum size.
- Observation Nucleolar budding occurred at the terminal chromosome knob attachment.
- Observation Chromosome pairing was parasynaptic and began at chromosome ends.
- Observation Nucleolus size increased to early diakinesis and then declined until metaphase.
- Observation Trivalent and univalent chromosomes occurred in some Japanese varieties.
- Observation Cytomyxis, cell fusion, binucleate and tetraploid pollen mother cells, and failed cytokinesis occurred.
- Observation These meiotic aberrations produced diploid gametes.
- Observation The authors concluded that nucleolar matrix substance contributes to chromosomes and reorganizes a nucleolus at telophase.