Abstract
Colchicine-indced polyploids derived from Oenothera (subgenus Raimannia) diploids with meiotic chromosome configurations 7 pairs, _??_ 10, 2 paris, _??_ 10, _??_ 4, and _??_ 14, were used to study chromosome behaviour of tetraploids in relation to structural heterozygosity. Tetraploid plants showed “gigas” features of morphology related to increased cell size; in octoploids, there was a further increase in cell size but overall size and vigor was reduced and they were infertile.Cytologically, all tetraploids showed a reduction in chaisma frequency. Meiotic irregularities of tetraploids and octoploids were similar to those found occasionally in diploids but occurred more frequently. Tetraploids derived from the structurally homozygous diploid race showed quadrivalents, trivalents, bivalents and univalents; those derived from completely structurally heterozygous diploids showed a range of chromosome configurations from univalents, through ring pairs and intermediate chains and circles to ch20. Intermediate tetraploids showed an intermediate configuration range although some differences between them could not be related to differences in their diploid progenitors and it was concluded that although chromosome behaviour of tetraploids is largely determined by the degree of structural heterozygosity of the diploid progenitor, the genetic makeup of a race may modify this behaviour.In tetraploids there was a fertility decrease in pollen and seed set except for pollen of O.mollissima Cayrasco where percentage sterile grains was unchanged; tetraploids derived from structurally heterozygous diploids showed a smaller fertility reduction than those derived from the homozygous diploids.
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Claims 14
Claim · model-written summary
Colchicine-induced tetraploid Oenothera plants showed gigas morphological features related to increased cell size.
OenotheraOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e1“Tetraploid plants showed “gigas” features of morphology related to increased cell size”
Claim · model-written summary
In octoploids there was a further increase in cell size.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e2“in octoploids, there was a further increase in cell size but overall size and vigor was reduced and they were infertile”
Claim · model-written summary
Overall size and vigor were reduced in octoploids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e2“in octoploids, there was a further increase in cell size but overall size and vigor was reduced and they were infertile”
Claim · model-written summary
Octoploids were infertile.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e2“in octoploids, there was a further increase in cell size but overall size and vigor was reduced and they were infertile”
Claim · model-written summary
All tetraploids showed a reduction in chiasma frequency.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e3“Cytologically, all tetraploids showed a reduction in chaisma frequency”
Claim · model-written summary
Meiotic irregularities of tetraploids and octoploids were similar to those in diploids but occurred more frequently.
- Material
- tetraploids and octoploidse4
- Outcome
- Meiotic irregularitiese4
- Direction
- occurred more frequentlye4
- Comparator
- diploidse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e4“Meiotic irregularities of tetraploids and octoploids were similar to those found occasionally in diploids but occurred more frequently”
Claim · model-written summary
Tetraploids derived from the structurally homozygous diploid race showed quadrivalents, trivalents, bivalents and univalents.
- Material
- Tetraploids derived from the structurally homozygous diploid racee5
- Outcome
- quadrivalents, trivalents, bivalents and univalentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e5“Tetraploids derived from the structurally homozygous diploid race showed quadrivalents, trivalents, bivalents and univalents”
Claim · model-written summary
Tetraploids derived from completely structurally heterozygous diploids showed a range of chromosome configurations from univalents to chains and circles.
- Material
- those derived from completely structurally heterozygous diploidse6
- Outcome
- a range of chromosome configurationse6
- Qualifier
- from univalents, through ring pairs and intermediate chains and circles to ch20e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e6“those derived from completely structurally heterozygous diploids showed a range of chromosome configurations from univalents, through ring pairs and intermediate chains and circles to ch20”
Claim · model-written summary
Intermediate tetraploids showed an intermediate chromosome configuration range.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e7“Intermediate tetraploids showed an intermediate configuration range”
Claim · model-written summary
Chromosome behaviour of tetraploids is largely determined by the degree of structural heterozygosity of the diploid progenitor.
- Outcome
- chromosome behavioure0
- Qualifier
- degree of structural heterozygosity of the diploid progenitore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e0“chromosome behaviour of tetraploids is largely determined by the degree of structural heterozygosity of the diploid progenitor”
Claim · model-written summary
The genetic makeup of a race may modify the chromosome behaviour of its tetraploids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e0“the genetic makeup of a race may modify this behaviour”
Claim · model-written summary
In tetraploids there was a fertility decrease in pollen and seed set.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e6“In tetraploids there was a fertility decrease in pollen and seed set”
Claim · model-written summary
Pollen of O. mollissima Cayrasco tetraploids showed an unchanged percentage of sterile grains.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e7“except for pollen of O.mollissima Cayrasco where percentage sterile grains was unchanged”
Claim · model-written summary
Tetraploids derived from structurally heterozygous diploids showed a smaller fertility reduction than those derived from the homozygous diploids.
- Material
- tetraploids derived from structurally heterozygous diploidse7
- Outcome
- fertility reductione7
- Direction
- smallere7
- Comparator
- those derived from the homozygous diploidse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Induced Polyploids in Oenothera”
e7“tetraploids derived from structurally heterozygous diploids showed a smaller fertility reduction than those derived from the homozygous diploids”