The relationships of the M and Mu genomes of Triticum

1983 ◽  
Vol 25 (5) ◽  
pp. 509-512 ◽  
Author(s):  
G. Kimber ◽  
D. Pignone ◽  
P. J. Sallee
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Preferential Pairing ◽  
Genome Species ◽  
Meiotic Chromosome Pairing ◽  
Relative Affinity

Triploid, tetraploid, and pentaploid hybrids involving M and Mu genome species were examined for meiotic chromosome pairing. Values of the relative affinity of the genomes involved were calculated and it is concluded that there is no preferential pairing of the M and Mu genomes. Consequently it is suggested that the Mu genome of Triticum uniaristatum be changed to Un.

Quantitative analysis of meiotic chromosome pairing in triploid blueberry: evidence for preferential pairing

Genome ◽  
1990 ◽  
Vol 33 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Nicholi Vorsa
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Chiasma Formation ◽  
Vaccinium Corymbosum ◽  
Preferential Pairing ◽  
Frequency Distributions ◽  
Meiotic Chromosome Pairing ◽  
Random Pairing ◽  
Random Frequency ◽  
Genome Divergence

Mathematical models have been developed to predict meiotic configuration frequency distributions for autoploid (random chromosome pairing) or preferential chromosome pairing behavior. Meiotic chromosome pairing was quantitatively analysed, relative to these models, in six highbush blueberry (Vaccinium corymbosum) triploid (2n = 3x = 36) hybrids derived from three unrelated 4x × 2x crosses. Mean trivalent per cell frequencies ranged from 3.59 to 7.89. Excess univalents were observed in triploids of one cross and are probably a result of disturbance in chiasma formation or maintenance and (or) random pairing failure. Arm chiasmate association values (a and b) ranged from 0.72 to 1.00, with the greatest difference in arm values being 0.18. Trivalent to ring bivalent (r) ratios ranged from 0.59 to 2.02. The observed configuration frequency distributions of three triploids having r-values greater than 1 did not deviate significantly from the autoploid pairing (p = 0) model frequency distribution. Frequency distributions of three triploids having r-values less than 1 deviated significantly from the autoploid model. Ranges for pairing affinity relationships include the possibility of two genomes pairing preferentially at a frequency of 77.7% (0.444 points over the random frequency of 0.333), which suggests the presence of genome divergence in blueberry. However, violation of model assumptions could seriously bias preferential pairing estimates. Segregating genetic factors also appear to be of significance in chromosome pairing behavior.Key words: autotriploids, chromosome pairing, preferential pairing, genome divergence, meiotic configurations.

Inferences from genetical evidence on the course of meiotic chromosome pairing in plants

1977 ◽  
Vol 277 (955) ◽  
pp. 313-326 ◽  
Keyword(s):  
Chromosome Pairing ◽  
Developmental Stages ◽  
Meiotic Chromosome ◽  
Critical Assessment ◽  
Gene Control ◽  
Meiotic Pairing ◽  
Homologous Chromosomes ◽  
Meiotic Chromosome Pairing ◽  
Combined Use ◽  
Or Gene

Meiotic chromosome pairing is a process that is amenable to genetic and experimental analysis. The combined use of these two approaches allows for the process to be dissected into several finite periods of time in which the developmental stages of pairing can be precisely located. Evidence is now available, in particular in plants, that shows that the pairing of homologous chromosomes, as observed at metaphase I, is affected by events occurring as early as the last premeiotic mitosis; and that the maintenance of this early determined state is subsequently maintained by constituents (presumably proteins) that are sensitive to either colchicine, temperature or gene control. A critical assessment of this evidence in wheat and a comparison of the process of pairing in wheat with the course of meiotic pairing in other plants and animals is presented.

Chromosome pairing in Oryza sativa L. × O. latifolia Desv. hybrids

1986 ◽  
Vol 28 (2) ◽  
pp. 278-281 ◽  
Author(s):  
E. M. Nowick
Keyword(s):  
Oryza Sativa ◽  
Chromosome Pairing ◽  
Embryo Culture ◽  
Oryza Sativa L ◽  
Meiotic Chromosome ◽  
Genetic System ◽  
Meiotic Chromosome Pairing

Meiotic chromosome pairing was examined in F1 hybrid regenerants from Oryza sativa (AA) × O. latifolia (CCDD) and O. glumaepatula (AcuAcu) × O. latifolia (CCDD) crosses produced through embryo culture. The average number of chromosome pairs in the O. sativa × O. latifolia regenerants ranged from 13.79 to 14.79. Ten to 18 bivalents were observed per cell. The average number of bivalents in the O. glumaepatula × O. latifolia regenerants ranged from 12.44 to 13.87, with 10–17 bivalents per cell. Some desynapsis occurred but 10 to 12 true bivalents remained at late metaphase in most cells. The high number of bivalents observed in the hybrids from these divergent parents indicates that a genetic system for pairing control similar to that in Triticum may be present in the Oryza genus.Key words: Oryza, embryo culture, meiosis.

Isolation of a LIM15/DMC1 homolog from the basidiomycete Coprinus cinereus and its expression in relation to meiotic chromosome pairing

1999 ◽  
Vol 262 (4-5) ◽  
pp. 781-789 ◽  
Author(s):  
T. Nara ◽  
T. Saka ◽  
T. Sawado ◽  
H. Takase ◽  
Y. Ito ◽  
...  
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Coprinus Cinereus ◽  
Meiotic Chromosome Pairing

Duplicate Genetic Activities affecting Meiotic Chromosome Pairing at Low Temperatures in Triticum

Nature ◽  
1967 ◽  
Vol 216 (5119) ◽  
pp. 1028-1029 ◽  
Author(s):  
A. M. HAYTER ◽  
RALPH RILEY
Keyword(s):  
Chromosome Pairing ◽  
Low Temperatures ◽  
Meiotic Chromosome ◽  
Meiotic Chromosome Pairing

scholarly journals EM analysis of meiotic chromosome pairing in a pentaploid Achillea hybrid

Heredity ◽  
1990 ◽  
Vol 65 (1) ◽  
pp. 11-20 ◽  
Author(s):  
J Loidl ◽  
F Ehrendorfer ◽  
D Schweizer
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Meiotic Chromosome Pairing

The B chromosome system of Inner MongolianAgropyronGaertn. 2. Effects of Bs on homologous and homoeologous meiotic chromosome pairing

Caryologia ◽  
1993 ◽  
Vol 46 (4) ◽  
pp. 293-299 ◽  
Author(s):  
Qin Chen ◽  
Joseph Jahier ◽  
Yvonne Cauderon
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
B Chromosome ◽  
Meiotic Chromosome Pairing
Sign in / Sign up

Export Citation Format

Share Document