Abstract
Results of hybridization studies among the 6 species of subgenus Diplothrix (Zinnia-compositae) are reported. Also included are analyses of chiasmata frequency in the parental species and 2 diploid hybrids. Pairing relationships and chiasmata frequency of the chromosomes in the hybrids of the diploid species indicate their genomes are homologous. Analyses of F2's of Z. juni-perifolia X acerosa (2n) show that production of pigment in ray flowers, C, from Z. juniperifolia segregates as a simple dominant over colorless, cc, from Z. acerosa. Morphological studies of the hybrids produced to date indicate that the origin of the polyploid taxa has been more circuitous than simple hybridization followed by chromosome doubling. The genomic constitution of Z. juniperifolia is designated A1A1, that of Z. acerosa A2A2, and that of Z. oligantha A3A3. Morphological data and chromosomal pairing in the polyploid hybrids suggest that the tetraploid species should be tentatively assigned genomic formulae as follows: A1A1A2A2 or A1A1A3A3 for both Z. citrea, and Z. grandiflora, and A2A2A3A3 for 4n Z. acerosa.
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Claims 9
Claim · model-written summary
Chromosome pairing and chiasmata frequency indicate homologous genomes in diploid Zinnia hybrids.
- Outcome
- genomes are homologouse0
ZinniaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pairing relationships and chiasmata frequency of the chromosomes in the hybrids of the diploid species indicate their genomes are homologous”
t0“Perennial Zinnias”
Claim · model-written summary
Ray flower pigment from Z. juniperifolia segregates as a simple dominant over colorless flowers from Z. acerosa.
- Taxon
- Z. juniperifolia
Zinnia juniperifoliae0 - Organ / stage
- ray flowerse0
- Gene
- Ce0
- Outcome
- production of pigment in ray flowerse0
- Comparator
- Z. acerosae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analyses of F2's of Z. juni-perifolia X acerosa (2n) show that production of pigment in ray flowers, C, from Z. juniperifolia segregates as a simple dominant over colorless, cc, from Z. acerosa”
Claim · model-written summary
Hybrid morphology suggests polyploid taxa originated through a more circuitous route than simple hybridization and chromosome doubling.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Morphological studies of the hybrids produced to date indicate that the origin of the polyploid taxa has been more circuitous than simple hybridization followed by chromosome doubling”
t0“Perennial Zinnias”
Claim · model-written summary
The authors designated the genomic constitution of Z. juniperifolia A1A1.
- Taxon
- Z. juniperifoliaZinnia juniperifoliae0
- Outcome
- genomic constitutione0
- Value
- A1A1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genomic constitution of Z. juniperifolia is designated A1A1”
Claim · model-written summary
The authors designated the genomic constitution of Z. acerosa A2A2.
- Taxon
- Z. acerosa
Zinnia acerosae0 - Outcome
- A2A2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of Z. acerosa A2A2”
Claim · model-written summary
The authors designated the genomic constitution of Z. oligantha A3A3.
- Taxon
- Z. oliganthaZinnia oliganthae0
- Outcome
- A3A3e0
Verbatim
e0“that of Z. oligantha A3A3”
Claim · model-written summary
Z. citrea was assigned A1A1A2A2 or A1A1A3A3.
- Taxon
- Z. citreaZinnia citreae0
- Outcome
- A1A1A2A2 or A1A1A3A3e0
Verbatim
e0“A1A1A2A2 or A1A1A3A3 for both Z. citrea, and Z. grandiflora”
Claim · model-written summary
Z. grandiflora was assigned A1A1A2A2 or A1A1A3A3.
- Taxon
- Z. grandiflora
Zinnia grandiflorae0 - Outcome
- A1A1A2A2 or A1A1A3A3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A1A1A2A2 or A1A1A3A3 for both Z. citrea, and Z. grandiflora”
Claim · model-written summary
Tetraploid Z. acerosa was assigned A2A2A3A3.
- Taxon
- Z. acerosaZinnia acerosae0
- Material
- 4n Z. acerosae0
- Outcome
- A2A2A3A3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A2A2A3A3 for 4n Z. acerosa”