scholarly journals Molecular mapping of the suppressor gene Igc1 to the gametocidal gene Gc3-C1 in common wheat

2010 ◽  
Vol 85 (1) ◽  
pp. 43-53 ◽  
Author(s):  
Soichi Yamano ◽  
Miyuki Nitta ◽  
Hisashi Tsujimoto ◽  
Goro Ishikawa ◽  
Toshiki Nakamura ◽  
...  
Keyword(s):  
Common Wheat ◽  
Molecular Mapping ◽  
Suppressor Gene ◽  
Gametocidal Gene

Gametocidal genes in wheat and its relatives. II. Suppressor of the chromosome 3C gametocidal gene of Aegilops triuncialis

1985 ◽  
Vol 27 (2) ◽  
pp. 178-185 ◽  
Author(s):  
H. Tsujimoto ◽  
K. Tsunewaki
Keyword(s):  
Common Wheat ◽  
Suppressor Gene ◽  
Hybrid Dysgenesis ◽  
Wheat Cultivars ◽  
Aegilops Triuncialis ◽  
Single Chromosome ◽  
High Frequencies ◽  
Gametocidal Gene ◽  
Dominant Suppressor ◽  
Chromosome 3B

Chromosome 3C of Aegilops triuncialis, in the monosomic state, causes semisterility in common wheat cultivars (Triticum aestivum). The Japanese cultivar 'Norin 26' carries a gene that acts as dominant suppressor of the gametocidal gene on chromosome 3C. However, this suppressor gene does not alter the functions of the gametocidal gene on chromosome 4S1 of Ae. longissima or Ae. sharonensis. By means of monosomic analyses, the suppressor has been located on chromosome 3B and is designated Igc1. This gene is distributed widely among wheat cultivars bred in central and southwest Japan. In the presence of Igc1 chromosome 3C shows no preferential transmission, but is transmitted to offspring at a frequency similar to those of other alien chromosomes. The progeny of plants that carry a single chromosome 3C exhibit chromosome aberrations, and possibly mutations, at high frequencies. Thus, the gametocidal gene on chromosome 3C causes a syndrome similar to hybrid dysgenesis in common wheat.Key words: common wheat, Aegilops triuncialis, gametocidal gene, suppressor, hybrid dysgenesis.

The association of a gene for leaf rust resistance with the chromosome 7D suppressor of stem rust resistance in common wheat

Genome ◽  
1987 ◽  
Vol 29 (3) ◽  
pp. 467-469 ◽  
Author(s):  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Suppressor Gene ◽  
Stem Rust Resistance ◽  
Recurrent Parent ◽  
Cytogenetic Evidence

Backcross lines of gene LrT2 for resistance to leaf rust in the common wheat (Triticum aestivum L.) 'Thatcher' unexpectedly show improved resistance to stem rust compared with that of the recurrent parent. Genetic–cytogenetic evidence indicates that LrT2 is on chromosome 7D, which is known to carry the "suppressor" gene(s) that prevent the expression of stem rust resistance conferred by other genes in 'Canthatch'. Thus, LrT2 may be a nonsuppressing allele of the suppressor gene(s) or be closely linked to such an allele. LrT2 has been designated Lr34. Key words: Triticum, wheat, rust resistance.

Effect of Ph2 mutants promoting homoeologous pairing on spindle sensitivity to colchicine in common wheat

Genome ◽  
1987 ◽  
Vol 29 (4) ◽  
pp. 658-663
Author(s):  
Carla Ceoloni ◽  
Moshe Feldman
Keyword(s):  
Common Wheat ◽  
Suppressor Gene ◽  
Intergeneric Hybrids ◽  
Differential Sensitivity ◽  
Root Tip ◽  
Lower Sensitivity ◽  
Homoeologous Pairing ◽  
Wild Type ◽  
Cellular Target ◽  
Chromosome Arm

Two lines of common wheat cv. Chinese Spring carrying mutant alleles for the Ph2 homoeologous pairing-suppressor gene on chromosome arm 3DS promoting homoeologous pairing in wheat interspecific and intergeneric hybrids have been tested for their mitotic sensitivity to colchicine. Both the ph2a mutation, which corresponds to a fairly long deletion of 3DS, and ph2b, which is either an intragenic change or a very small deletion, as well as the ph2a/ph2b heteroallelic combination and the deficiency for the entire 3DS arm (ditelo 3DL), conditioned a significantly lower sensitivity to colchicine than that determined by the wild-type allele Ph2 (euploid and ditelo 3DS). Observation of both metaphase and anaphse root-tip cell populations, treated with various colchicine concentrations, provided similar results. The degree of spindle disruption in 2 × 10−4 M colchicine, as measured by the percentage of fully affected metaphases (C type), was significantly reduced in ph2 and Ph2− genotypes and, consequently, a larger proportion of cells could proceed toward anaphase and also had a regular segregation pattern at this stage. The differential sensitivity of ph2 genotypes to colchicine is in the opposite direction to that previously found for ph1 genotypes, lacking the homoeologous pairing suppressor on chromosome arm 5BL. The ph2 mutation, while promoting homoeologous pairing as ph1 does, decreases spindle sensitivity to colchicine with respect to the wild-type (ph2) allele rather than increasing it, as ph1 does. The observed alteration of spindle sensitivity to colchicine that mutants for structurally unrelated but functionally related genes (Ph1 and Ph2) condition is interpreted as a highly probable coincidence in their cellular target. It is assumed therefore that these loci affect the equilibrium between tubulin and microtubules. Through this effect they presumably determine chromosome positioning in somatic and premeiotic stages, leading to different pairing patterns at meiosis. Key words: Triticum aestivum, tubulin, pairing suppressors, somatic association.

scholarly journals Molecular Mapping of a Leaf Rust Resistance Gene on the Short Arm of Chromosome 6B of Durum Wheat

Plant Disease ◽  
2008 ◽  
Vol 92 (12) ◽  
pp. 1650-1654 ◽  
Author(s):  
S. A. Herrera-Foessel ◽  
R. P. Singh ◽  
J. Huerta-Espino ◽  
H. M. William ◽  
A. Djurle ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Common Wheat ◽  
Rust Resistance ◽  
Molecular Mapping ◽  
Infection Type ◽  
Leaf Rust Resistance ◽  
Rust Resistance Gene ◽  
Leaf Rust Resistance Gene

Leaf rust, caused by Puccinia triticina, is an important disease of durum wheat (Triticum turgidum subsp. durum) worldwide, and the most effective way to control it is through the use of resistant cultivars. A partially dominant leaf rust resistance gene present in the International Maize and Wheat Improvement Center-derived Chilean cv. Guayacan INIA and its sister line Guayacan 2 was mapped to chromosome arm 6BS by identifying linked amplified fragment length polymorphisms (AFLPs) and mapping two of the molecular markers in common wheat (T. aestivum) linkage maps of the International Triticeae Mapping Initiative and Oligoculm × Fukuho-komugi populations. Comparison of infection type responses of the two resistant durums with common wheat testers carrying the previously mapped resistance genes Lr36 and Lr53 on 6BS, and their chromosomal positions, indicated that the resistance gene in durum wheat Guayacan INIA is a new leaf rust resistance gene, which was designated as Lr61. Gene Lr61 is effective against the P. triticina race BBG/BN predominant in northwestern Mexico and other races infecting durum wheat in various countries.

Genetic analysis and molecular mapping of a new powdery mildew resistant gene Pm46 in common wheat

2012 ◽  
Vol 125 (5) ◽  
pp. 967-973 ◽  
Author(s):  
Haidong Gao ◽  
Fangfang Zhu ◽  
Yanjie Jiang ◽  
Jizhong Wu ◽  
Wei Yan ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Genetic Analysis ◽  
Common Wheat ◽  
Molecular Mapping ◽  
Resistant Gene

THE INHERITANCE OF LEAF RUST RESISTANCE IN FOUR COMMON WHEAT VARIETIES POSSESSING GENES AT OR NEAR THE Lr3 LOCUS

1973 ◽  
Vol 15 (1) ◽  
pp. 127-134 ◽  
Author(s):  
M. E. A. Haggag ◽  
P. L. Dyck
Keyword(s):  
Genetic Analysis ◽  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Suppressor Gene ◽  
The Other ◽  
Wheat Varieties ◽  
Seedling Resistance

The inheritance of seedling resistance to leaf rust was studied in the wheat varieties Democrat, Sinvalocho, Bage and Klein Aniversario and in the backcross lines developed from them. The Lr3 gene from Democrat and Sinvalocho conferred resistance to races 1, 9 and 11. Genetic analysis of the Sinvalocho × Prelude0 line (with Lr3), using a rust culture that was avirulent on Democrat × Thatcher6 and Sinvalocho etc., but virulent on Sinvalocho × Prelude6, indicated the presence of a suppressor gene in Prelude. The variety Bage has two genes for resistance to races 9 and 11, one giving a 0; reaction and the other a type 2. The former gene was present in Bage × Thatcher8 and was allelic to, or closely linked with, the Lr3 gene. It is temporarily designated Lr3bg. Klein Aniversario may have two independently inherited genes conferring resistance to race 11 and two to race 161. One of the genes conferred resistance to both races and was transferred to Thatcher and Prelude. This gene was also allelic to, or closely linked with, the Lr3 gene and is designated Lr3ka. These results suggest a complex Lr3 locus with a series of alleles or closely linked genes.

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