Differential DNA Replication Involved in Transition From Juvenile to Adult Phase in Hedera helix (Araliaceae)

1979 ◽  
pp. 105-110 ◽  
Author(s):  
Karl-Heinz Schäffner ◽  
Walter Nagl
Keyword(s):  
Dna Replication ◽  
Hedera Helix ◽  
Adult Phase ◽  
Differential Dna Replication

A DNA cytophotometric and chromosome banding study in Hedera helix (Araliaceae), with reference to differential DNA replication associated with juvenile–adult phase change

Genome ◽  
1987 ◽  
Vol 29 (3) ◽  
pp. 498-503 ◽  
Author(s):  
C. König ◽  
I. Ebert ◽  
J. Greilhuber
Keyword(s):  
Dna Replication ◽  
Genome Size ◽  
Chromosome Banding ◽  
Nuclear Dna ◽  
Nuclear Dna Content ◽  
Developmental Phase ◽  
Hedera Helix ◽  
Leaf Tissues ◽  
Differential Dna Replication ◽  
Developmental Phases

The present DNA cytophotometric and chromosome banding comparison of the juvenile and the adult developmental phase in the common ivy, Hedera helix, was undertaken as an attempt to verify or refute the asserted phase-correlated differential DNA replication in this plant. No statistically significant differences between the two developmental phases were found in genome size (as determined from mitotic nuclei), nuclear DNA content in resting meristems and somatic leaf tissues, and content of constitutive heterochromatin as measured from C-banded metaphase plates. There is no evidence for differential DNA replication in Hedera helix. Key words: Hedera helix, differential DNA replication, morphogenesis, genome size, chromosome structure.

DIFFERENTIAL DNA REPLICATION IN THE XX AND XY CELLS OF MUSCA DOMESTICA L. OCRA STRAIN

1970 ◽  
Vol 12 (3) ◽  
pp. 461-473 ◽  
Author(s):  
K. Y. Jan ◽  
J. W. Boyes
Keyword(s):  
Dna Replication ◽  
Musca Domestica ◽  
Sex Chromosomes ◽  
Chromosome Length ◽  
Final Part ◽  
X Chromosomes ◽  
Y Chromosomes ◽  
Heteromorphic Sex Chromosomes ◽  
Autosomal Pair ◽  
Differential Dna Replication

The karyotype of Musca domestica L. ocra strain, consists of the sex chromosomes and five autosomal pairs. The heteromorphic sex chromosomes are heterochromatic and mitotically unpaired, whereas the autosomes are euchromatic and mitotically paired. All autosomal pairs and both X and Y chromosomes are cytologically recognizable.The relative labelling rate, R (in terms of the number of grains counted per 100 labelled metaphases per μ of chromosome length) for the sex chromosomes and for each autosomal pair was followed from 1.5 hours to 8 hours after H3TdR injection. The pattern of labelling rate was similar for the different autosomal pairs in the XX cells but this pattern for the autosomal pairs in the XY cells, though also similar for the different pairs, differed appreciably from that found in the XX cells. The pattern of the labelling rate for the X chromosomes was similar in the XX and XY cells. Also the pattern of labelling rate for the X and Y chromosomes was similar during the final part of the replication period. The two X chromosomes in the XX cells and the X and Y chromosomes in the XY cells completed labelling later than the autosomes.

Sign in / Sign up

Export Citation Format

Share Document