A CYTOGENETIC ANALYSIS OF CERTAIN POLYPLOIDS IN GRINDELIA (COMPOSITAE)

@article{Dunford1964ACA,
  title={A CYTOGENETIC ANALYSIS OF CERTAIN POLYPLOIDS IN GRINDELIA (COMPOSITAE)},
  author={Max P. Dunford},
  journal={American Journal of Botany},
  year={1964},
  volume={51},
  pages={49-56}
}
  • M. Dunford
  • Published 1964
  • Biology
  • American Journal of Botany
Two diploid taxa, Grindelia procera and G. camporum, and 3 tetraploid ones, G. camporum, G. hirsutula, and G. stricta, have been studied to ascertain their interrelationships. Meiosis in diploid parental strains was regular, the common chromosome configuration being 5 rod bivalents and 1 ring bivalent. The average chiasmata frequency per chromosome was 0.60. Pollen fertility was about 90% in all strains examined. Diploid interspecific hybrids had normal meiosis with an average chiasmata… 
CHROMOSOME ANALYSIS OF HYBRIDS BETWEEN 4N GRINDELIA CAMPORUM AND 2N G. GRANDIFLORA (COMPOSITAE)
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Morphology and meiosis are described in four progeny plants resulting from tetraploid Grindelia camporum Greene from California and Coahuila, Mexico, which are separated cytologically by polyploidy and by two distinct chromosomal interchanges that explain the configurations observed in the triploid hybrid.
Triploid and tetraploid hybrids from diploid x tetraploid crosses in Grindella (compositae).
  • M. Dunford
  • Biology, Medicine
    American journal of botany
  • 1970
TLDR
It was concluded that Grindelia tetraploids were autopolyploids that had undergone some diploidization (Dunford, 1964) and that G. aphanactis is more closely related toG.
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CHROMOSOME RELATIONSHIPS OF DIPLOID SPECIES OF GRINDELIA (COMPOSITAE) FROM COLORADO, NEW MEXICO, AND ADJACENT AREAS'
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Hypothetical chromosome end arrangements and names for the respective genomes, based on G. oxylepis as a standard, are presented to corroborate a previously published phylogenetic scheme of the genus based on morphological, ecological, and distributional studies.
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Almost all polyploids arise by way of unreduced gametes; other mechanisms occur, but are negligible in the evolution of polyploid systems.
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The Pacific Clade of Grindelia and other young Californian plant groups warrant additional analysis of evolutionary divergence along the steep coast-to-inland climatic gradient, which has been associated with local adaptation and ecotype formation since the classic studies of Clausen, Keck, and Hiesey.
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The reproductive biology of Grindelia covasii, a perennial resinous herb close to G. chiloensis and considered a potential industrial crop for arid lands, was studied and the importance of the introduction of the honeybee and the possible effect on natural pollinators is discussed.
Phylogenetic and Population Genetic Studies in Grindelia (Asteraceae: Astereae)
  • A. Moore
  • Biology, Environmental Science
  • 2010
TLDR
Although phylogenetic analysis shows that CA-FP Grindelia form a clade, relationships within the clade remain unresolved due to a lack of sequence divergence, an intermediate approach is chosen, recognizing what I consider to be the most morphological and ecologically distinctive ecotypes or clusters of ecotypes as taxa.
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References

SHOWING 1-10 OF 14 REFERENCES
THE GENUS COLLINSIA. XVI. SUPERNUMERARY CHROMOSOMES
TLDR
The pairing and transmission of supernumerary chromosomes in Collinsia solitaria and in hybrids between C. sparsiflora subsp.
REDUCTION OF QUADRIVALENT FREQUENCY IN AUTOTETRAPLOID MAIZE DURING A PERIOD OF 10 YEARS
TLDR
It is known from the study of experimental polyploids that autoploids of recent origin typically form multivalents due to the random pairing of chromosomes which are sufficiently homologous to alloploids.
Frequency of Quadrivalents in Autotetraploid Plants
TLDR
The cause of low quadrivalent formation has been related to the paucity of ‘pairing blocks’, the position of the centromeres in chromosomes, and chiasma interference across the centromere1.
NATURAL TRIPLOIDS IN THE ORCHARD GRASS, DACTYLIS GLOMERATA L., POLYPLOID COMPLEX AND THEIR SIGNIFICANCE FOR GENE FLOW FROM DIPLOID TO TETRAPLOID LEVELS
TLDR
An attempt is made to examine the genetic relationships between diploid and tetraploid populations of the Orchard Grass, Dactylis glomerata L., in places where such populations come in contact in Israel.
Variations in Chromosomal Association and Behavior During Meiosis Among Plants from Open-Pollinated Populations of Dactylis glomerata
TLDR
Chromosomal association and behavior during meiosis was determined from duplicate collections of twelve plants and single collections of eight plants from open-pollinated populations of Dactylis glomerata, with significant differences between the dates of collection and among plants.
CHANGES IN THE VARIATION PATTERN OF A HYBRID POPULATION OF HELIANTHUS OVER AN EIGHT‐YEAR PERIOD
TLDR
The two annual sunflowers of California, Helianthus annuus and H. Bolanderi, occupy different ecological niches, and have been subjected to a series of careful cytotaxonomic studies by Heiser, from whose work the above information was obtained.
CHROMOSOME NUMBERS IN THE COMPOSITAE. IV. NORTH AMERICAN SPECIES, WITH PHYLETIC INTERPRETATIONS
TLDR
The present contribution is essentially a continuation of several papers, the latest of which (Turner and Johnston, 1961) dealt with chromosome counts from species of northeastern Miexico; except for reports for 3 Florida taxa, the counts reported in the present paper were obtained, for the most part, fromspecies of southern Mexico and Guatemala.
A California Flora
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