Abstract
Mitotic instability was found in an intraspecific hybrid of Haplopappus gracilis (Nutt.) Gray and in an interspecific hybrid of H. arenarius Benth. and H. aureus Gray. The latter cross was between distantly related species with different chromosome numbers and amounts of DNA. The intraspecific hybrid exhibited a partly recessive phenotype due to loss of a chromosome segment containing the wild type locus, and the interspecific hybrid showed abnormal developmental patterns for several morphological characters due to chromatin loss. Both hybrids were slower growing, smaller, and generally weaker than parental types. In both examples, this weakness was correlated with chromatin loss due to cleavage by cell wall formation across chromosome arms too long to separate properly at anaphase. This was caused by a very unequal translocation in H. gracilis and to a disparity in genome sizes in the interspecific hybrid. In both examples, the initial chromosome cleavage resulted in a breakage‐fusion‐bridge cycle that persisted into some BC, progeny of H. gracilis.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Mitotic instability occurred in an intraspecific Haplopappus gracilis hybrid.
- Taxon
- Haplopappus gracilis
Xanthisma gracilee0 - Material
- intraspecific hybride0
- Outcome
- Mitotic instabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mitotic instability was found in an intraspecific hybrid of Haplopappus gracilis (Nutt.) Gray”
Claim · model-written summary
Mitotic instability occurred in an interspecific H. arenarius and H. aureus hybrid.
- Taxon
- H. arenariusXanthisma arenariume0
- Material
- interspecific hybride0
- Outcome
- interspecific hybride0
Verbatim
e0“and in an interspecific hybrid of H. arenarius Benth. and H. aureus Gray.”
Claim · model-written summary
The intraspecific hybrid showed a partly recessive phenotype from loss of a segment bearing the wild type locus.
- Taxon
- HAPLOPAPPUS
Haplopappust0 - Gene
- wild type locuse0
- Outcome
- partly recessive phenotypee0
- Qualifier
- loss of a chromosome segmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intraspecific hybrid exhibited a partly recessive phenotype due to loss of a chromosome segment containing the wild type locus”
t0“HAPLOPAPPUS”
Claim · model-written summary
The interspecific hybrid showed abnormal developmental characters due to chromatin loss.
- Taxon
- HAPLOPAPPUSHaplopappust0
- Outcome
- abnormal developmental patterns for several morphological characterse0
- Qualifier
- chromatin losse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the interspecific hybrid showed abnormal developmental patterns for several morphological characters due to chromatin loss”
t0“HAPLOPAPPUS”
Claim · model-written summary
Both hybrids grew more slowly, were smaller and weaker than parents.
- Taxon
- HAPLOPAPPUSHaplopappust0
- Outcome
- slower growing, smaller, and generally weakere0
- Direction
- slowere0
- Comparator
- parental typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both hybrids were slower growing, smaller, and generally weaker than parental types.”
t0“HAPLOPAPPUS”
Claim · model-written summary
Hybrid weakness correlated with chromatin loss from chromosome-arm cleavage at anaphase.
- Taxon
- HAPLOPAPPUSHaplopappust0
- Outcome
- weaknesse0
- Qualifier
- chromatin loss due to cleavage by cell wall formation across chromosome arms too long to separate properly at anaphasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this weakness was correlated with chromatin loss due to cleavage by cell wall formation across chromosome arms too long to separate properly at anaphase”
t0“HAPLOPAPPUS”
Claim · model-written summary
An unequal translocation in H. gracilis caused weakness.
- Taxon
- H. gracilisXanthisma gracilee0
- Outcome
- Thise0
- Qualifier
- very unequal translocatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was caused by a very unequal translocation in H. gracilis”
t0“HAPLOPAPPUS: STRUCTURAL AND GENIC CAUSES”
Claim · model-written summary
Genome-size disparity contributed to hybrid weakness.
- Taxon
- HAPLOPAPPUSHaplopappust0
- Outcome
- interspecific hybride0
- Qualifier
- disparity in genome sizese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and to a disparity in genome sizes in the interspecific hybrid.”
t0“HAPLOPAPPUS: STRUCTURAL AND GENIC CAUSES”
Claim · model-written summary
Initial chromosome cleavage produced a persistent breakage-fusion-bridge cycle.
- Taxon
- H. gracilisXanthisma gracilee0
- Outcome
- breakage‐fusion‐bridge cyclee0
- Qualifier
- initial chromosome cleavagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the initial chromosome cleavage resulted in a breakage‐fusion‐bridge cycle that persisted into some BC, progeny of H. gracilis.”