Genotypic control of chromosome pairing in amphiploids involving the cultivated oat Avena sativa L.

Euphytica ◽  
1988 ◽  
Vol 37 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Hugh Thomas ◽  
N. Al-Ansari
Keyword(s):  
Chromosome Pairing ◽  
Avena Sativa ◽  
Genotypic Control

CHROMOSOME RELATIONSHIPS BETWEEN THE CULTIVATED OAT AVENA SATIVA (6x) AND A. VENTRICOSA (2x)

1970 ◽  
Vol 12 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Hugh Thomas
Keyword(s):  
Chromosome Pairing ◽  
Avena Sativa ◽  
Diploid Species ◽  
Meiotic Behaviour ◽  
Hexaploid Species ◽  
C Genome

Chromosome pairing in the F1 hybrid between the cultivated oat Avena sativa and a diploid species A. ventricosa, and in the derived amphiploid, shows that the diploid species is related to one of the genomes of the hexaploid species. The amount of chromosome pairing observed in complex interamphiploid hybrids demonstrates further that A. ventricosa is related to the C. genome of A. sativa. However, the chromosomes of the diploid species have become differentiated from that of the C genome of A. sativa and this is readily apparent in the meiotic behaviour of both the F1 hybrid and the amphiploid.

scholarly journals Distribution of Multivalents and Genotypic Control of Chromosome Pairing in Setcreasea Species and Hybrids

CYTOLOGIA ◽  
1971 ◽  
Vol 36 (2) ◽  
pp. 309-320 ◽  
Author(s):  
K. L. Mehra ◽  
P. R. Sreenath ◽  
S. A. Faruqi
Keyword(s):  
Chromosome Pairing ◽  
Genotypic Control

THE MEIOTIC BEHAVIOR OF ANEUPOLYHAPLOIDS OF THE CULTIVATED OAT AVENA SATIVA (2n = 6x = 42)

1977 ◽  
Vol 19 (4) ◽  
pp. 651-656 ◽  
Author(s):  
J. M. Leggett
Keyword(s):  
Genetic Control ◽  
Chromosome Pairing ◽  
Avena Sativa ◽  
Meiotic Behavior ◽  
Homoeologous Chromosomes

Chromosome pairing and the frequency of secondary associations in two aneupolyhaploid plants of A. sativa are described. There was little evidence of pairing between homoeologous chromosomes in either plant. The results are discussed in relation to the genetic control of bivalent pairing in A. sativa and the possible divergence between the constituent genomes.

Synaptic mutants in hexaploid oats (Avena sativa L.)

Genome ◽  
1988 ◽  
Vol 30 (1) ◽  
pp. 1-7 ◽  
Author(s):  
H. W. Rines ◽  
S. S. Johnson
Keyword(s):  
Chromosome Pairing ◽  
Sodium Azide ◽  
Avena Sativa ◽  
Seed Set ◽  
Single Gene ◽  
Inheritance Pattern ◽  
Late Prophase ◽  
Homologous Chromosomes ◽  
Breeding Station ◽  
Meiotic Synapsis

Three meiotic synapsis-deficient mutants of oats (Avena sativa L.) were analyzed to determine their inheritance pattern, detailed chromosomal behavior, and location to chromosome. These highly sterile mutants, one in the cultivar 'Stout' and two in 'Noble', had been recovered from progeny of sodium azide mutagenized populations. Each segregated as a single gene recessive. The only synapsis-deficient variants previously described in hexaploid oats have been nullisomics or ditelosomics. Mutant 'Stout 1212' was classified as asynaptic due to deficiencies in chromosome pairing at all meiotic stages. Mutants 'Noble 1362' and 'Noble 1911' were classified as desynaptic since their homologous chromosomes were paired in early meiosis but they disassociated prematurely in late prophase I. Using a partial monosomic series from the Welsh Plant Breeding Station, mutant 1212 was mapped to monosome XII and is probably a mutation in Syn-5, a gene previously defined only by its nulli effect. Mutants 1362 and 1911 were mapped to monosome IV and are probably mutations in Syn-1, a gene also previously defined only by its nulli effect. Seed set on the synaptic mutant plants in the field was less than 0.2% of that on fertile sibs and likely resulted from pollination by surrounding fertile plants. This seed may serve as a source of unique aneuploid stocks in oats.Key words: meiotic mutants, gene mapping, monosomics, nullisomics, oat cytogenetics.

scholarly journals Genotypic control of chromosome behaviour in rye X. Chromosome pairing and fertility in autotetraploids

Heredity ◽  
1967 ◽  
Vol 22 (3) ◽  
pp. 317-332 ◽  
Author(s):  
M H Hazarika ◽  
H Rees
Keyword(s):  
X Chromosome ◽  
Chromosome Pairing ◽  
Chromosome Behaviour ◽  
Genotypic Control

CHROMOSOME RELATIONSHIPS BETWEEN AVENA SATIVA AND THE TWO DIPLOID SPECIES A. CANARIENSIS AND A. PROSTRATA

1974 ◽  
Vol 16 (4) ◽  
pp. 889-894 ◽  
Author(s):  
Hugh Thomas ◽  
J. M. Leggett
Keyword(s):  
Chromosome Pairing ◽  
Avena Sativa ◽  
Diploid Species ◽  
Morphological Features ◽  
Tetraploid Hybrid ◽  
Hexaploid Species

Although the diploid species Avena canariensis has a number of morphological features in common with the hexaploid species of Avena, the degree of chromosome pairing in the tetraploid hybrid A. canariensis × A. sativa did not reveal closer homology with A. sativa than that of another diploid species, A. prostrata. The chromosomes of both these newly described diploid species are only partially homologous with one of the genomes of A. sativa. The two diploid species A. prostrata and A. canariensis are differentiated by translocations involving three pairs of chromosomes.

Interspecific hybrids involving the perennial oat species Avena macrostachya

1985 ◽  
Vol 27 (1) ◽  
pp. 29-32 ◽  
Author(s):  
J. M. Leggett
Keyword(s):  
Chromosome Pairing ◽  
Avena Sativa ◽  
Interspecific Hybrids ◽  
Preferential Pairing

The chromosome pairing affinities and some morphological comparisons are described in two hybrids involving the autotetraploid perennial oat species Avena macrostachya, the hexaploid cultivated oat species Avena sativa, and the tetraploid oat Avena murphyi. Chromosome pairing in the hybrids indicates that some homology between the chromosomes of the three species exists, but that it may be masked by the preferential pairing of the chromosomes from the A. macrostachya parent.Key words: Avena, meiosis, hybridization, phylogeny.

Genotypic control of chromosome pairing in Avena longiglumis � A. sativa hybrids

Chromosoma ◽  
1980 ◽  
Vol 79 (1) ◽  
pp. 115-124 ◽  
Author(s):  
Hugh Thomas ◽  
N. Al-Ansari
Keyword(s):  
Chromosome Pairing ◽  
Genotypic Control

SEM Cold Stage Techniques for the Observation of Vegetative and Floral Apices of Oat (Avena sativa L.) Plants

1977 ◽  
Vol 35 ◽  
pp. 590-591
Author(s):  
B. K. Kirchoff ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Critical Point ◽  
Avena Sativa ◽  
Substantial Improvement ◽  
Fresh Tissue ◽  
Cold Stage ◽  
Critical Point Drying ◽  
Almost All ◽  
Cell Collapse ◽  
Conductive Paint ◽  
Carbon Based

In attempting to use the SEM to investigate the transition from the vegetative to the floral state in oat (Avena sativa L.) it was discovered that the procedures of fixation and critical point drying (CPD), and fresh tissue examination of the specimens gave unsatisfactory results. In most cases, by using these techniques, cells of the tissue were collapsed or otherwise visibly distorted. Figure 1 shows the results of fixation with 4.5% formaldehyde-gluteraldehyde followed by CPD. Almost all cellular detail has been obscured by the resulting shrinkage distortions. The larger cracks seen on the left of the picture may be due to dissection damage, rather than CPD. The results of observation of fresh tissue are seen in Fig. 2. Although there is a substantial improvement over CPD, some cell collapse still occurs.Due to these difficulties, it was decided to experiment with cold stage techniques. The specimens to be observed were dissected out and attached to the sample stub using a carbon based conductive paint in acetone.

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