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 is positively correlated with floral and vegetative characters, including pollen size.
- Organ / stage
- pollene0
- Outcome
- floral and vegetative characters, including pollen sizee0
- Direction
- positive correlatione0
Not reportedTaxon
Verbatim
e0“There is a positive correlation between chromosome number and many floral and vegetative characters, including pollen size.”
Claim · model-written summary
Chiasmata frequency is about 0.63 per chromosome in diploids.
Not reportedTaxon
Verbatim
e0“Chiasmata frequency is about 0.63 and 0.62 per chromosome in the diploid and in the tetraploid respectively.”
Claim · model-written summary
Chiasmata frequency is about 0.62 per chromosome in tetraploids.
Not reportedTaxon
Verbatim
e0“Chiasmata frequency is about 0.63 and 0.62 per chromosome in the diploid and in the tetraploid respectively.”
Claim · model-written summary
Multivalents are common in the tetraploid.
Not reportedTaxon
Verbatim
e0“Multivalents are common in the latter.”
Claim · model-written summary
Attempts to induce tetraploids with colchicine failed.
Not reportedTaxonComparator
Verbatim
e0“attempts to obtain colchicine‐induced tetraploids have failed”
Claim · model-written summary
The tetraploid may be of autoploid origin.
Not reportedTaxon
Verbatim
e0“the tetraploid may be of autoploid origin”
Claim · model-written summary
The tetraploid is treated taxonomically as a race of Z. juniperifolia.
Verbatim
e0“Taxonomically the tetraploid is considered a race of Z. juniperifolia”