Characterisation of repeated sequences from microdissected B chromosomes of Crepis capillaris

Chromosoma ◽  
1995 ◽  
Vol 104 (2) ◽  
pp. 113-120 ◽  
Author(s):  
M. Jamilena ◽  
M. Garrido-Ramos ◽  
M. Ruiz Rej�n ◽  
C. Ruiz Rej�n ◽  
J. S. Parker
Keyword(s):  
B Chromosomes ◽  
Repeated Sequences ◽  
Crepis Capillaris

Characterisation of repeated sequences from microdissected B chromosomes of Crepis capillaris

Chromosoma ◽  
1995 ◽  
Vol 104 (2) ◽  
pp. 113-120 ◽  
Author(s):  
M. Jamilena ◽  
M. Garrido-Ramos ◽  
M. Ruiz Rej�n ◽  
C. Ruiz Rej�n ◽  
J. S. Parker
Keyword(s):  
B Chromosomes ◽  
Repeated Sequences ◽  
Crepis Capillaris

Identification of a family of repeated sequences on the rye B chromosome

Genome ◽  
1990 ◽  
Vol 33 (6) ◽  
pp. 908-913 ◽  
Author(s):  
Michael J. Sandery ◽  
John W. Forster ◽  
Richard Blunden ◽  
R. Neil Jones
Keyword(s):  
Secale Cereale ◽  
Direct Evidence ◽  
B Chromosome ◽  
Repeat Sequence ◽  
B Chromosomes ◽  
Repeated Sequences ◽  
Significant Heterogeneity ◽  
Origin And Evolution ◽  
The Family

A novel family of highly repeated sequences on the B chromosome of rye (Secale cereale) has been identified. The D1100 family has not been detected on the rye A chromosomes and shows little or no homology to any previously described repeat sequence in rye. In addition, different rye species, and different B chromosomes within the same species, show significant heterogeneity in the arrangement of the D1100 sequences. An EcoRI clone of a member of the family has been obtained. These results provide direct evidence for the organisation and nature of the B-chromosome DNA in rye, and they are discussed in relation to the origin and evolution of rye B chromosomes.Key words: B chromosome, Secale cereale, repeated sequences.

scholarly journals The population cytogenetics of Crepis capillaris IV. The distribution of B-chromosomes in British populations

Heredity ◽  
1991 ◽  
Vol 66 (2) ◽  
pp. 211-218 ◽  
Author(s):  
J S Parker ◽  
G H Jones ◽  
L A Edgar ◽  
C Whitehouse
Keyword(s):  
B Chromosomes ◽  
Crepis Capillaris

scholarly journals Molecular relationship between the A and B chromosomes of Crepis capillaris

Heredity ◽  
1994 ◽  
Vol 73 (5) ◽  
pp. 527-531 ◽  
Author(s):  
M Jamilena ◽  
M Garrido-Ramos ◽  
C Ruiz Rejón ◽  
M Ruiz Rejón
Keyword(s):  
B Chromosomes ◽  
Crepis Capillaris

Ultrastructure of meiotic pairing in B chromosomes of Crepis capillaris

Chromosoma ◽  
1991 ◽  
Vol 100 (3) ◽  
pp. 193-202 ◽  
Author(s):  
G. H. Jones ◽  
S. M. Albini ◽  
J. A. F. Whitehorn
Keyword(s):  
B Chromosomes ◽  
Meiotic Pairing ◽  
Crepis Capillaris

Ultrastructure of meiotic pairing in B chromosomes of Crepis capillaris. I. One-B and two-B pollen mother cells

Genome ◽  
1989 ◽  
Vol 32 (4) ◽  
pp. 611-621 ◽  
Author(s):  
G. H. Jones ◽  
J. A. F. Whitehorn ◽  
S. M. Albini
Keyword(s):  
Synaptonemal Complex ◽  
Chromosome Pairing ◽  
Complex Surface ◽  
B Chromosome ◽  
B Chromosomes ◽  
Meiotic Pairing ◽  
Pollen Mother Cells ◽  
Crepis Capillaris ◽  
Axis Length ◽  
Mother Cells

Chromosome pairing of a small metacentric B chromosome in Crepis capillaris has been studied by synaptonemal complex surface spreading of pollen mother cells containing either one or two B chromosomes. The B-chromosome axis, on average, represents about 8.7% of the axis length of the standard A-chromosome set, which is less than the corresponding values for DNA content (10.6%) and mitotic chromosome volume (13.6%). Single B chromosomes commonly undergo fold-back pairing to give a symmetrical hairpin loop, which supports earlier suggestions that this B chromosome is an isochromosome. Two B chromosomes may show interarm pairing, exclusively, or interchromosome pairing, exclusively, or combinations of the two. Near the centromeres pairing occurs preferentially between arms of the same chromosome, but chromosome ends show random association. Some B chromosomes show anomalous pairing configurations, which may reflect further orders of reverse repeats within arms or, alternatively, nonhomologous pairing. The period of B-chromosome pairing is confined almost exclusively to zygotene, when the standard A chromosomes are pairing, but within this period their pairing is delayed relative to the A set. Individual B chromosomes at zygotene contain from one to three separate synaptonemal complex segments. These are widely distributed within the chromosomes, mainly in distal and interstitial regions; pairing is delayed around the centromere.Key words: B chromosomes, isochromosomes, synaptonemal complex.

scholarly journals Influence of the Presence of B Chromosomes on DNA Damage in Crepis capillaris

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e87337 ◽  
Author(s):  
Jolanta Kwasniewska ◽  
Agnieszka Mikolajczyk
Keyword(s):  
Dna Damage ◽  
B Chromosomes ◽  
Crepis Capillaris

scholarly journals The population cytogenetics of Crepis capillaris. II. The stability and inheritance of B-chromosomes

Heredity ◽  
1989 ◽  
Vol 63 (1) ◽  
pp. 19-27 ◽  
Author(s):  
J S Parker ◽  
G H Jones ◽  
L Edgar ◽  
C Whitehouse
Keyword(s):  
B Chromosomes ◽  
Crepis Capillaris ◽  
The Stability

Distribution and clustering of two highly repeated sequences in the A and B chromosomes of maize

1985 ◽  
Vol 70 (3) ◽  
pp. 234-239 ◽  
Author(s):  
A. Viotti ◽  
E. Privitera ◽  
E. Sala ◽  
N. Pogna
Keyword(s):  
B Chromosomes ◽  
Repeated Sequences
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