Abstract
A comparative study of the distribution, habitat, morphology and cytology of diploid (n = 10) and tetraploid races of Z. juniperifolia of the subgenus Diplothrix (COMPOSITAE-Heliantheae) was carried out to elucidate their relationships. There is a positive correlation between chromosome number and many floral and vegetative characters, including pollen size. Chiasmata frequency is about 0.63 and 0.62 per chromosome in the diploid and in the tetraploid respectively. Multivalents are common in the latter. Although attempts to obtain colchicine-induced tetraploids have failed, available morphological, cytological and chromatographic evidence indicate the tetraploid may be of autoploid origin. Alternative ancestries involving other species of the subgenus are discussed. Taxonomically the tetraploid is considered a race of Z. juniperifolia.
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Claims 7
Claim · model-written summary
Chromosome number was positively correlated with floral and vegetative characters including pollen size.
- Taxon
- Zinnia juniperifolia
Zinnia juniperifoliat0 - Material
- chromosome numbere0
- Outcome
- floral and vegetative characters, including pollen sizee0
- Direction
- positive correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is a positive correlation between chromosome number and many floral and vegetative characters, including pollen size”
t0“Zinnia juniperifolia”
Claim · model-written summary
Chiasmata frequency was about 0.63 per chromosome in diploids.
- Taxon
- Zinnia juniperifoliaZinnia juniperifoliat0
- Material
- diploide0
- Outcome
- Chiasmata frequencye0
- Value
- 0.63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chiasmata frequency is about 0.63 and 0.62 per chromosome in the diploid and in the tetraploid respectively”
t0“Zinnia juniperifolia”
Claim · model-written summary
Chiasmata frequency was about 0.62 per chromosome in tetraploids.
- Taxon
- Zinnia juniperifoliaZinnia juniperifoliat0
- Material
- tetraploide0
- Outcome
- Chiasmata frequencye0
- Value
- 0.62 per chromosomee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chiasmata frequency is about 0.63 and 0.62 per chromosome in the diploid and in the tetraploid respectively”
t0“Zinnia juniperifolia”
Claim · model-written summary
Multivalents were common in tetraploids.
- Taxon
- Zinnia juniperifoliaZinnia juniperifoliat0
- Material
- tetraploide1
- Outcome
- Multivalentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multivalents are common in the latter”
t0“Zinnia juniperifolia”
e1“in the tetraploid respectively”
Claim · model-written summary
Attempts to obtain colchicine-induced tetraploids failed.
- Taxon
- Zinnia juniperifoliaZinnia juniperifoliat0
- Treatment
- colchicine-inducede0
- Outcome
- tetraploidse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“attempts to obtain colchicine-induced tetraploids have failed”
t0“Zinnia juniperifolia”
Claim · model-written summary
The tetraploid race was inferred to have an autoploid origin.
- Taxon
- Zinnia juniperifoliaZinnia juniperifoliat0
- Material
- tetraploide0
- Outcome
- autoploid origine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evidence indicate the tetraploid may be of autoploid origin”
t0“Zinnia juniperifolia”
Claim · model-written summary
The tetraploid was treated taxonomically as a race of Z. juniperifolia.
- Taxon
- Z. juniperifoliaZinnia juniperifoliae0
- Material
- tetraploide0
- Outcome
- race of Z. juniperifoliae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taxonomically the tetraploid is considered a race of Z. juniperifolia”