Die Struktur der Pachyt�nchromosomen in Euchromatin und Heterochromatin und ihre Auswirkung auf die Chiasmabildung bei Salvia-Arten

Linnert, Gertrud

doi:10.1007/bf00329721

Cited by 67 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It may be argued that in plants like Antirrhinurn (ERNST, 1939, MECHELKE andSTUBRE, 1954) and Saluia (LINNERT, 1955) where no gradient is observed, the findings here reported may not apply. It has already been pointed out that the gradients are not of universal occurrence but that they are to be found in a large number of organisms.…”

Section: The Main Objections Raised Against the Concept Of Chromosomecontrasting

confidence: 53%

The Role of the Kinetochore in Chromosome Organization

Lima-de-Faria

2010

Hereditas

131

View full text Add to dashboard Cite

Section: The Main Objections Raised Against the Concept Of Chromosomecontrasting

confidence: 53%

The Role of the Kinetochore in Chromosome Organization

Lima-de-Faria

2010

Hereditas

131

View full text Add to dashboard Cite

“…Similar observations concerning a spatial neighbourhood between chiasmata and heterochromatin were made in other plant and animal species such as Salvia nemorosa (Linnert, 1955), Cestrum (Dyer, 1963), Secale cereale (Jones, 1978), Vicia faba (Friebe, 1979), Bryodema tuberculatum bavaricum (White, 1954a), and Stethophyma grossa (White, 1954b). White's observations, however, were extended by Klfi~terskfi et al (1974), who found the relationship between chiasmata and heterochromatin to be of a more subtle nature.…”

Section: Discussionsupporting

confidence: 48%

Further evidence for a heterochromatin-chiasma correlation in some Allium species

Loidl

1982

Genetica

View full text Add to dashboard Cite

Even in cases in which C-bands are intercalary in chromosomes of Allium carinatum and A. flavum, chiasmata are formed in immediately adjacent regions. This argues against considerations that there exists merely a spatial proximity between the commonly found distal chiasmata and the C-bands in corresponding regions, without any causal relation. Furthermore, a closely related species, A. sipyleum, without distinctly visible C-bands has a much less localized chiasma distribution in its bivalents.

show abstract

“…Chiasmata observed in heterochromatin were suggested to have formed in tiny islands of euchromatin within heterochromatin or in euchromatin near heterochromatin, so that subsequent chromatin condensation obscured the euchromatin (Linnert 1955;Fontana and Vickery 1974;Klášterská et al 1974;Jones 1978;Loidl 1979;de la Torre et al 1986;Berger and Greilhuber 1991). This is difficult to prove or disprove, and small islands of euchromatin have been observed in some heterochromatin (Linnert 1955;Ramanna and Prakken 1967). Based on the assumption that crossing over does not occur in heterochromatin, this is a plausible explanation for observations of chiasmata that appear to be in heterochromatin, but it is not evidence that crossing over does not occur in heterochromatin.…”

mentioning

confidence: 99%

Meiotic Crossing Over in Maize Knob Heterochromatin

et al. 2017

View full text Add to dashboard Cite

There is ample evidence that crossing over is suppressed in heterochromatin associated with centromeres and nucleolus organizers (NORs). This characteristic has been attributed to all heterochromatin, but the generalization may not be justified. To investigate the relationship of crossing over to heterochromatin that is not associated with centromeres or NORs, we used a combination of fluorescence in situ hybridization of the maize 180-bp knob repeat to show the locations of knob heterochromatin and fluorescent immunolocalization of MLH1 protein and AFD1 protein to show the locations of MLH1 foci on maize synaptonemal complexes (SCs, pachytene chromosomes). MLH1 foci correspond to the location of recombination nodules (RNs) that mark sites of crossing over. We found that MLH1 foci occur at similar frequencies per unit length of SC in interstitial knobs and in the 1 mm segments of SC in euchromatin immediately to either side of interstitial knobs. These results indicate not only that crossing over occurs within knob heterochromatin, but also that crossing over is not suppressed in the context of SC length in maize knobs. However, because there is more DNA per unit length of SC in knobs compared to euchromatin, crossing over is suppressed (but not eliminated) in knobs in the context of DNA length compared to adjacent euchromatin.

show abstract

Die Struktur der Pachyt�nchromosomen in Euchromatin und Heterochromatin und ihre Auswirkung auf die Chiasmabildung bei Salvia-Arten

Cited by 67 publications

References 39 publications

The Role of the Kinetochore in Chromosome Organization

The Role of the Kinetochore in Chromosome Organization

Further evidence for a heterochromatin-chiasma correlation in some Allium species

Meiotic Crossing Over in Maize Knob Heterochromatin

Contact Info

Product

Resources

About