scholarly journals Chromosome conjugation on the hybrids between induced autotetraploid Aegilops squarrosa and Triticum Timopheevi

1960 ◽  
Vol 35 (10) ◽  
pp. 321-328 ◽  
Author(s):  
Atusi ZENNYOZI
Keyword(s):  
Triticum Timopheevi ◽  
Aegilops Squarrosa ◽  
Chromosome Conjugation

scholarly journals A nuclear compatibility gene, Ncc-tmp, of Triticum timopheevi for the cytoplasm of Aegilops squarrosa.

1997 ◽  
Vol 72 (2) ◽  
pp. 71-78 ◽  
Author(s):  
Nobuaki Asakura ◽  
Chiharu Nakamura ◽  
Ichiro Ohtsuka
Keyword(s):  
Triticum Timopheevi ◽  
Aegilops Squarrosa

MONOSOMIC ANALYSIS OF FERTILITY RESTORATION IN THREE RESTORER LINES OF WHEAT

1969 ◽  
Vol 11 (3) ◽  
pp. 531-546 ◽  
Author(s):  
Fu-Sun Yen ◽  
L. E. Evans ◽  
E. N. Larter
Keyword(s):  
Triticum Aestivum ◽  
Fertility Restoration ◽  
Major Gene ◽  
Triticum Aestivum L ◽  
Restorer Line ◽  
Monosomic Analysis ◽  
Minor Gene ◽  
Triticum Timopheevi ◽  
Aegilops Squarrosa ◽  
A Minor

Genes conferring fertility restoration, in each of the following three hexaploid restorer lines of common wheat (Triticum aestivum L) carrying cytoplasm of Triticum timopheevi Zhuk, were located using monosomic analyses: [(T. timopheevi × Aegilops squarrosa) × Canthatch3] F7, [(T. timopheevi × Ae. squarrosa) × Dirk3] F6 and (T. timopheevi × Ae. squarrosa) × Karn3] F6.Testcross data revealed that in the Dirk restorer, a major gene (Rf1) conferring fertility restoration was carried on chromosome 1A, while a minor gene (Rf4) was located on chromosome 7D. The restorer line of Canthatch was found to carry a major gene (Rf2) and a minor gene (Rf3) on chromosomes 6B ad 6D respectively. Chromosomes 1A and 6B were found to carry genes for fertility restoration in the Karn restorer. Critical chromosomes carrying genes conferring fertility restoration in each of the three restorer lines were found not to be involved in translocations found in F1 plants of Rescue monosomics × restorer lines. Chromosomes 2A, 6A and 3D of Rescue appeared to carry genes which modified the degree of restoration obtained.

scholarly journals Molecular variation in chloroplast DNA regions in ancestral species of wheat.

Genetics ◽  
1994 ◽  
Vol 137 (3) ◽  
pp. 883-889 ◽  
Author(s):  
N T Miyashita ◽  
N Mori ◽  
K Tsunewaki
Keyword(s):  
Chloroplast Dna ◽  
Restriction Enzymes ◽  
Triticum Dicoccoides ◽  
The Other ◽  
Major Type ◽  
Aegilops Speltoides ◽  
Triticum Timopheevi ◽  
Restriction Sites ◽  
D Values ◽  
Chloroplast Dna Regions

Abstract Restriction map variation in two 5-6-kb chloroplast DNA regions of five diploid Aegilops species in the section Sitopsis and two wild tetraploid wheats, Triticum dicoccoides and Triticum araraticum, was investigated with a battery of four-cutter restriction enzymes. A single accession each of Triticum durum, Triticum timopheevi and Triticum aestivum was included as a reference. More than 250 restriction sites were scored, of which only seven sites were found polymorphic in Aegilops speltoides. No restriction site polymorphisms were detected in all of the other diploid and tetraploid species. In addition, six insertion/deletion polymorphisms were detected, but they were mostly unique or species-specific. Estimated nucleotide diversity was 0.0006 for A. speltoides, and 0.0000 for all the other investigated species. In A. speltoides, none of Tajima's D values was significant, indicating no clear deviation from the neutrality of molecular polymorphisms. Significant non-random association was detected for three combinations out of 10 possible pairs between polymorphic restriction sites in A. speltoides. Phylogenetic relationship among all the plastotypes (plastid genotype) suggested the diphyletic origin of T. dicoccoides and T. araraticum. A plastotype of one A. speltoides accession was identical to the major type of T. araraticum (T. timopheevi inclusively). Three of the plastotypes found in the Sitopsis species are very similar, but not identical, to that of T. dicoccoides, T. durum and T. aestivum.

Forces of Attraction of Homologous Loci and Chromosome Conjugation

Nature ◽  
1935 ◽  
Vol 136 (3429) ◽  
pp. 108-109 ◽  
Author(s):  
B. N. SIDOROV ◽  
N. N. SOKOLOV ◽  
I. E. TROFIMOV
Keyword(s):  
Chromosome Conjugation

VARIATION IN THE TRANSMISSION OF UNIVALENT CHROMOSOMES FROM PENTAPLOID WHEAT HYBRIDS

1968 ◽  
Vol 10 (4) ◽  
pp. 908-912 ◽  
Author(s):  
F. H. Alston ◽  
J. K. Jones
Keyword(s):  
Chinese Spring ◽  
Chromosome Complement ◽  
Aegilops Squarrosa ◽  
Wheat Hybrids

Univalent transmission was studied in aneuploids from pentaploid (AABBD) wheat hybrids. Two groups of such hybrids were used: one group carried heterozygous AABB chromosome complements derived from crosses between T. aestivum cv. Chinese Spring monosomics XV-XXI and T. durum, cvs. Nursi and Samara, 2n = 28; the second group had homozygous AABB complements and came from crosses between the amphiploid (T. durum cv. Carleton × Aegilops squarrosa) and T. durum cv. Carleton. The transmission of univalent D chromosomes was markedly reduced when most of the AABB chromosome complement was derived from T. durum.

CYTOLOGICAL STUDIES OF THE DEVELOPMENT OF METAPHASE I IN HYBRIDS BETWEEN TRITICUM TIMOPHEEVI ZHUK. AND T. DURUM DESF.

1961 ◽  
Vol 39 (1) ◽  
pp. 81-108 ◽  
Author(s):  
E. B. Wagenaar
Keyword(s):  
Late Stage ◽  
Developmental Stages ◽  
Progressive Increase ◽  
Cell Populations ◽  
Equatorial Plate ◽  
Triticum Timopheevi ◽  
Late Stages ◽  
I Cells ◽  
Metaphase I

In two hybrids between Triticum timopheevi Zhuk. and T. durum Desf., which have irregular meioses, metaphase I was subdivided into four developmental stages, early, medium, late, and very late. This subdivision was based on the presence in the anthers of other stages that occurred together with metaphase I. It was then discovered that in metaphase I cell populations there was a progressive increase of univalents from the early and medium stages to the very late stage. This phenomenon can be explained on the assumption that metaphase I is of shorter duration in the less irregular cells which pass into anaphase I earlier than the more irregular cells. As a consequence of this developmental phenomenon at metaphase I, the anaphase I and telophase I cells in the late anthers contained fewer lagging chromosomes than the anaphase I and telophase I cells in the very late anthers. Despite these numerical differences, the degrees of lagging were remarkably similar in both stages; approximately 70% of these univalents lagged at late and very late stages in both hybrids.During metaphase I many univalents of the irregular cells moved towards the equatorial plate, became oriented, and lagged at anaphase I and telophase I. It was found that the univalents of the least irregular cells accumulated somewhat faster at the plates than those of the more irregular cells.Considering the relationships between all of the available data, the hypothesis is advanced that when a certain number of univalents have accumulated at the equatorial plate a state of equilibrium is established and anaphase I is initiated. On the basis of this hypothesis an explanation of the trends observed at metaphase I is given.

scholarly journals Microsatellite markers for the Triticum timopheevi-derived leaf rust resistance gene Lr18 on wheat 5BL chromosome

2017 ◽  
Vol 67 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Ali Aliakbari Sadeghabad ◽  
Ali Dadkhodaie ◽  
Bahram Heidari ◽  
Hooman Razi ◽  
Reza Mostowfizadeh-Ghalamfarsa
Keyword(s):  
Microsatellite Markers ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Rust Resistance Gene ◽  
Leaf Rust Resistance Gene ◽  
Triticum Timopheevi
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