The control of chiasma frequeney within a polyploid series in the genus Senecio (Compositae)

Ingram, Richard; Noltie, H. J.

doi:10.1007/bf00126976

Cited by 7 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, mean chiasma frequency is directly related to ploidy. This is especially clear in species of Senecio (Ingram and Noltie 1987). Such a relation is evidently nucleotypic in nature and likely to be manifest as a multiplicative effect.…”

Section: Discussionmentioning

confidence: 88%

Meiotic variation in an intergenomic autopolyploid series. I. Chiasma frequency

Wallace¹,

Callow²

1995

Genome

View full text Add to dashboard Cite

Variation in chiasma frequency has been studied in PMCs of diploids and C0 autotetraploids of seven Lathyrus species exhibiting a range of genome size (10.8-19.9 pg DNA/2C). Variation in chiasma frequency showed no relation to changes in genome size, either between species or between disomic sets within nuclei. Mean chiasma frequency of the tetraploids showed a 75% increase over that in the diploids. Half of this increase represents an additive effect of chromosome doubling. Total variance in chiasma frequency of autotetraploids increases by 80% over that in diploids, in line with the square of the multiplicative effect of chromosome doubling. At the diploid level, interspecific differences account for the major component of variance (63.1%). Phenotypic variation in chiasma frequency was apparent in all seven species but represented the smallest component of variance (2.8%). Chromosome doubling results in an eightfold increase in the absolute size of the phenotypic component of variance in chiasma frequency and a threefold increase in that of the cellular component. It has no effect on the absolute size of the interspecific component.

show abstract

Section: Discussionmentioning

confidence: 88%

Meiotic variation in an intergenomic autopolyploid series. I. Chiasma frequency

Wallace¹,

Callow²

1995

Genome

View full text Add to dashboard Cite

show abstract

“…These two suggestions need not be mutually exclusive because there can be no clear division between autopolyploidy and allopolyploidy, and the nature of the control of chromosome pairing in polyploids of this group is complex (Ingram & Noltie, 1987.…”

Section: Introductionmentioning

confidence: 99%

Molecular systematics of the genus Senecio L. II: The origin of S. vulgaris L.

Ingram

1992

Heredity

View full text Add to dashboard Cite

The origin of Senecio vulgaris L. and the relationship of its two subspecies, ssp. vulgaris and ssp. denticulatus (0. F. Muell.) P. D. Sell, are examined using nuclear ribosomal and chioroplast DNA analyses. No evidence was found to support either an allopolyploid or an autopolyploid origin of S. vulgaris, although it would appear that S. vernalis Waldst. & Kit, is not one of the progenitor taxa. Two results of particular interest were found: (i) the apparent identity of the chioroplast genomes of S. vulgaris ssp. vulgaris and S. squalidus L. and (ii) the divergence of the chloroplast genomes of ssp. vulgaris and Ainsdale ssp. denticulatus by at least eight site mutations. These results are discussed in the light of evidence derived from morphological, cytological and allozyme studies.

show abstract

Effects of elevated temperature on meiotic chromosome synapsis in Allium ursinum

Loidl

1989

Chromosoma

View full text Add to dashboard Cite

The control of chiasma frequeney within a polyploid series in the genus Senecio (Compositae)

Abstract: Chiasma frequency in a polyploid series, and in the hybrids formed within it, are shown to be directly related to ploidy level, and to be independent of the apparent effective synapsis. The observations are related to previous observations and models on the control of chiasma frequency.

Cited by 7 publications

References 12 publications

Meiotic variation in an intergenomic autopolyploid series. I. Chiasma frequency

Meiotic variation in an intergenomic autopolyploid series. I. Chiasma frequency

Molecular systematics of the genus Senecio L. II: The origin of S. vulgaris L.

Effects of elevated temperature on meiotic chromosome synapsis in Allium ursinum

Contact Info

Product

Resources

About