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 F 2 's of Z. juni‐perifolia X acerosa (2 n ) 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 A 1 A 1 , that of Z. acerosa A 2 A 2 , and that of Z. oligantha A 3 A 3 . Morphological data and chromosomal pairing in the polyploid hybrids suggest that the tetraploid species should be tentatively assigned genomic formulae as follows: A 1 A 1 A 2 A 2 or A 1 A 1 A 3 A 3 for both Z. citrea, and Z. grandiflora, and A 2 A 2 A 3 A 3 for 4 n Z. acerosa.
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Claims 5
Claim · model-written summary
Chromosome pairing and chiasmata frequency indicate that the genomes of the diploid zinnia species are homologous.
Verbatim
t0“PERENNIAL ZINNIAS”
e1“Pairing relationships and chiasmata frequency of the chromosomes in the hybrids of the diploid species indicate their genomes are homologous”
Claim · model-written summary
Pigment production in ray flowers segregates as a simple dominant over colorless in F2 progeny of Z. juniperifolia crossed with Z. acerosa.
Verbatim
t0“PERENNIAL ZINNIAS”
e2“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
The genomic constitution of Z. juniperifolia is designated A1A1.
- Taxon
- Z. juniperifolia
Zinnia juniperifoliae3 - Outcome
- genomic constitutione3
- Qualifier
- designated A 1 A 1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“PERENNIAL ZINNIAS”
e3“The genomic constitution of Z. juniperifolia is designated A 1 A 1”
Claim · model-written summary
Tetraploid zinnia species should tentatively be assigned the genomic formulae given in the paper.
Verbatim
t0“PERENNIAL ZINNIAS”
e4“Morphological data and chromosomal pairing in the polyploid hybrids suggest that the tetraploid species should be tentatively assigned genomic formulae as follows”
Claim · model-written summary
The origin of the polyploid zinnia taxa was more circuitous than simple hybridization followed by chromosome doubling.
Verbatim
t0“PERENNIAL ZINNIAS”
e5“the origin of the polyploid taxa has been more circuitous than simple hybridization followed by chromosome doubling”