The C-band pattern of a Ph− mutant of durum wheat

1984 ◽  
Vol 26 (3) ◽  
pp. 360-363 ◽  
Author(s):  
J. Dvořák ◽  
Kuey-Chu Chen ◽  
B. Giorgi
Keyword(s):  
Durum Wheat ◽  
Chromosome Pairing ◽  
Tandem Duplication ◽  
Triticum Turgidum ◽  
Chromosome Region ◽  
Homologous Chromosomes ◽  
Sister Chromatids ◽  
Approximate Location ◽  
Parental Cultivar ◽  
Interband Region

A mutation of the Ph gene which normally suppresses heterogenetic chromosome pairing was obtained in cultivar 'Cappelli' of Triticum turgidum L. em Morris et Sears var. durum. The chromosomes of 'Cappelli,' the Ph− mutant, and another 'Cappelli' line suspected to have a duplication of part of arm 5Bq (5BL) were C-banded. Compared with arm 5Bq of the parental cultivar, the 5Bq arm of the Ph− mutant was shorter owing to a deletion of one of two interband regions in the middle of the arm. In the line suspected to have a duplication, the 5Bq arm was longer than in 'Cappelli' and the interband region that was absent in Ph− was twice as long. An interchange between sister chromatids or homologous chromosomes is suggested to be responsible for the deletion and tandem duplication of the chromosome region. The C-band patterns are used to infer the approximate location of the Ph gene in the 5Bq arm.Key words: wheat, C-band, deletion, duplication, Triticum, 5B chromosome.

Alien chromosome addition in durum wheat. II. Advanced progeny

Genome ◽  
1988 ◽  
Vol 30 (3) ◽  
pp. 303-306 ◽  
Author(s):  
J. Schulz-Schaeffer ◽  
S. E. Haller
Keyword(s):  
Durum Wheat ◽  
Chromosome Pairing ◽  
Triticum Turgidum ◽  
Alien Chromosome ◽  
Group Of Seven ◽  
Chromosome Addition ◽  
Agropyron Intermedium ◽  
Alien Chromosome Addition ◽  
Wheat Parent ◽  
Intermedium Chromosome

Alien chromosome addition in durum wheat was accomplished by backcrossing and selling an amphiploid derivative F10 strain of Triticum turgidum L. var. durum × Agropyron intermedium (Host) Beauv. The number of chromosome pairs increased from an average of 10.4 bivalents in the B1F1 to 18.5 bivalents in the B1F7 generation. Stabilization of chromosome pairing was improved as expressed in the range of bivalents (0–21 in the B1F1 and 16–21 in the B1F7 generation). Backcrossing to the durum wheat parent resulted in the elimination of some Agropyron chromosomes and in others becoming pairs. A hexaploid Agrotriticum with the constitution AABBII resulted. The I genome consists of a group of seven chromosome pairs from A. intermedium.Key words: Agrotriticum, Agropyron intermedium, chromosome pairing.

Development of Triticum turgidum subsp. durum – Aegilops longissima amphiploids with high iron and zinc content through unreduced gamete formation in F1 hybrids

Genome ◽  
2008 ◽  
Vol 51 (9) ◽  
pp. 757-766 ◽  
Author(s):  
Vijay K. Tiwari ◽  
Nidhi Rawat ◽  
Kumari Neelam ◽  
Gursharn S. Randhawa ◽  
Kuldeep Singh ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Chromosome Pairing ◽  
Triticum Turgidum ◽  
Zinc Content ◽  
F1 Hybrids ◽  
Unreduced Gamete ◽  
Wheat Cultivars ◽  
Aegilops Longissima ◽  
Gamete Formation ◽  
Iron And Zinc

Four different interspecific hybrids involving three different accessions of Aegilops longissima Schweinf. & Muschl. with high grain iron and zinc content and three Triticum turgidum L. subsp. durum (Desf.) Husn. cultivars with low micronutrient content were made for durum wheat biofortification and investigated for chromosome pairing, fertility, putative amphiploidy, and micronutrient content. The chromosome pairing in the 21-chromosome F1 hybrids (ABSl) consisted of 0–6 rod bivalents and occasionally 1 trivalent. All the F1 hybrids, however, unexpectedly showed partial but variable fertility. The detailed meiotic investigation indicated the simultaneous occurrence of two types of aberrant meiotic divisions, namely first-division restitution and single-division meiosis, leading to regular dyads and unreduced gamete formation and fertility. The F2 seeds, being putative amphiploids (AABBSlSl), had nearly double the chromosome number (40–42) and regular meiosis and fertility. The F1 hybrids were intermediate between the two parents for different morphological traits. The putative amphiploids with bold seed size had higher grain ash content and ash iron and zinc content than durum wheat cultivars, suggesting that Ae. longissima possesses a better genetic system(s) for uptake and seed sequestration of iron and zinc, which could be transferred to elite durum and bread wheat cultivars and exploited.

The assessment of boron toxicity tolerance in F6 RILs of durum wheat [Triticum turgidum (L.) Tell. convar. durum (Desf.) Mackey]

2021 ◽  
Author(s):  
Belgin Göçmen Taşkın ◽  
Özlem Özbek ◽  
Sibel Keskin Şan ◽  
Miloudi Mikael Nachit ◽  
Zeki Kaya
Keyword(s):  
Durum Wheat ◽  
Triticum Turgidum ◽  
Boron Toxicity

scholarly journals A novel transvection phenomenon affecting the white gene of Drosophila melanogaster.

Genetics ◽  
1990 ◽  
Vol 126 (1) ◽  
pp. 167-176
Author(s):  
D Gubb ◽  
M Ashburner ◽  
J Roote ◽  
T Davis
Keyword(s):  
Drosophila Melanogaster ◽  
Homologous Chromosome ◽  
Tandem Duplication ◽  
Gamma Ray ◽  
Insertion Site ◽  
Hairpin Loop ◽  
Homologous Chromosomes ◽  
Inverted Order ◽  
In Trans ◽  
In Cis

Abstract The zeste mutation of Drosophila melanogaster suppresses the expression of white genes in the eye. This suppression is normally dependent on there being two copies of w+ located close to each other in the genome--they may either be in cis (as in a tandem duplication of w+) or in trans, i.e. on homologous chromosomes. Duplicated w+ genes carried by a giant transposing element, TE146(Z), are suppressed by z whether they are in direct (tandem) or inverted order. The tandem form of the TE is very sensitive to a rearrangement on the homologous chromosome--many rearrangements with breakpoints "opposite" the TE's insertion site prevent the interaction between the white genes on a z background. These aberrations act as dominant suppressors of zeste that are specific to the tandemly duplicated form of TE146(Z). The inverted form of the TE146(Z) presumably pairs as a hairpin loop; this is more stable than the tandem form by the criterion that its zeste phenotype is unaffected by any of the aberrations. This effect of rearrangements has been used as the basis for a screen, gamma-ray induced aberrations with at least one breakpoint opposite the TE site were recovered by their suppression of the zeste phenotype.

scholarly journals Screening of Durum Wheat (Triticum turgidum L. subsp. durum (Desf.) Husn.) Italian Cultivars for Susceptibility to Fusarium Head Blight Incited by Fusarium graminearum

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 68
Author(s):  
Gaetano Bentivenga ◽  
Alfio Spina ◽  
Karim Ammar ◽  
Maria Allegra ◽  
Santa Olga Cacciola
Keyword(s):  
Durum Wheat ◽  
Fusarium Head Blight ◽  
Fusarium Graminearum ◽  
Triticum Turgidum ◽  
Disease Incidence ◽  
Morphological Characteristics ◽  
Pcr Amplification ◽  
Conidial Suspension ◽  
Head Blight ◽  
Italian Origin

In 2009, a set of 35 cultivars of durum wheat (Triticum turgidum L. subsp. durum (Desf.) Husn.) of Italian origin was screened for fusarium head blight (FHB) susceptibility at CIMMYT (Mexico) and in the 2019–20 cropping season, 16 of these cultivars, which had been included in the Italian National Plant Variety Register, were tested again in southern and northern Italy. Wheat cultivars were artificially inoculated during anthesis with a conidial suspension of Fusarium graminearum sensu lato using a standard spray inoculation method. Inoculum was a mixture of mono-conidial isolates sourced in the same areas where the trials were performed. Isolates had been characterized on the basis of morphological characteristics and by DNA PCR amplification using a specific primer set and then selected for their virulence and ability to produce mycotoxins. The susceptibility to FHB was rated on the basis of the disease severity, disease incidence and FHB index. Almost all of the tested cultivars were susceptible or very susceptible to FHB with the only exception of “Duprì”, “Tiziana” and “Dylan” which proved to be moderately susceptible. The susceptibility to FHB was inversely correlated with the plant height and flowering biology, the tall and the late heading cultivars being less susceptible.

scholarly journals Field resistance to wheat stem rust in durum wheat ( Triticum turgidum ssp. durum ) accessions deposited at the USDA National Small Grains Collection

Crop Science ◽  
2021 ◽  
Author(s):  
Pablo D. Olivera ◽  
Worku D. Bulbula ◽  
Ayele Badebo ◽  
Harold E. Bockelman ◽  
Erena A. Edae ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Stem Rust ◽  
Triticum Turgidum ◽  
Field Resistance ◽  
Wheat Stem Rust ◽  
Small Grains

Transcend Durum wheat

2012 ◽  
Vol 92 (4) ◽  
pp. 809-813 ◽  
Author(s):  
A. K. Singh ◽  
J. M. Clarke ◽  
R. E. Knox ◽  
R. M. DePauw ◽  
T. N. McCaig ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Protein Concentration ◽  
Triticum Turgidum ◽  
Cadmium Concentration ◽  
Fusarium Head Blight Resistance ◽  
Head Blight ◽  
Canadian Prairies ◽  
Days To Maturity ◽  
Production Area ◽  
Concentration Test

Singh, A. K., Clarke, J. M., Knox, R. E., DePauw, R. M., McCaig, T. N., Fernandez, M. R. and Clarke, F. R. 2012. Transcend durum wheat. Can. J. Plant Sci. 92: 809–813. Transcend durum wheat [Triticum turgidum L. subsp. durum (Desf.) Husn.] is adapted to the durum production area of the Canadian prairies. It combines high grain yield, grain protein concentration, test weight, yellow grain and dough pigment, and low grain cadmium concentration. Transcend has strong straw, slightly more days to maturity, and improved Fusarium head blight resistance compared to Strongfield.

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