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  • 1
    Digitale Medien
    Digitale Medien
    Effects of D-genome chromosomes on crossability of hexaploid triticale (X Triticosecale Wittmack) with maize (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 116 (1997), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: With the aim of producing polyhaploids of hexaploid triticale, 20 genotypes from a CIMMYT breeding programme and eight D-genome chromosome substitution lines of ‘Rhino’ were crossed with maize. In crosses between 20 triticale genotypes and maize, 15 lines produced embryos. Frequencies of embryo formation ranged from 0.0 to 5.4%, with an average of 1.1%. From a total of 200 pollinated spikes, 62 plants were regenerated. Most regenerated plants were polyhaploids with 21 chromosomes, and few aneuhaploids with 22 chromosomes were found. In crosses of triticale substitution lines with maize, all the lines produced embryos, while ‘Rhino’ produced no embryos at all. Higher frequencies of embryo formation were obtained in substitution lines with chromosomes 2D and 4D. These results suggest that D-genome chromosomes in a triticale genetic background have the effect of increasing the frequency of polyhaploid production in triticale x maize crosses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1997.tb01017.x
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  • 2
    Digitale Medien
    Digitale Medien
    The 1BL/1RS chromosome translocation effect on yield characteristics in a Triticum aestivum L. cross (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 114 (1995), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Comparisons involving 28 random F2-derived F6 wheat (Triticum aestivum L.) lines from the cross, ‘Nacozari’/‘Seri 82’, suggested that advanced derivatives with the 1BL/1RS chromosome translocation possess superior agronomic performance in both full and reduced irrigation conditions when compared with 1B derivatives. This performance advantage was attributed to high grain yield, above-ground biomass at maturity, grains/spike, 1000-grain weight and test weight. The 1BL/1RS lines were shorter with delayed flowering and maturity. The superiority of the 1BL/1RS translocation group on grains/m2 was expressed only under the full irrigation environment. Higher harvest index, longer spike-length and grain-filling period were detected only under reduced irrigation conditions. A significant grain yield relationship with test weight was detected only among the 1BL/1RS genotypes, indicating that they possess heavier and plumper grains than the 1B genotypes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1995.tb00843.x
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  • 3
    Digitale Medien
    Digitale Medien
    Inheritance of resistance to Tilletia indica (Mitra) in synthetic hexaploid wheat ×Triticum aestivum crosses (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 114 (1995), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Inheritance of resistance to Karnal bunt was investigated in the crosses of four resistant synthetic hexaploid wheats (SH; Triticum turgidum×T. tauschii) and two susceptible T. aestivum cultivars. The resistance was dominant or partly dominant over susceptibility. The SH cultivars Chen/T. tauschii (205) and Chen/T. tauschii (224) have single dominant resistance genes which could be allelic to each other. ‘Altar 84’/T. tauschii (219) appeared to have two dominant genes for resistance. ‘Duergand’T. tauschii (214) possessed two complementary dominant genes for resistance. The work is being extended to involve diverse Karnal bunt-resistant SH and bread wheat cultivars.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1995.tb00855.x
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  • 4
    Digitale Medien
    Digitale Medien
    Inheritance of threshability in synthetic hexaploid (Triticum turgidum×T. tauschii) by T. aestivum crosses (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 115 (1996), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Triticum tauschii provides breeders with a valuable source of resistance and tolerance genes. Elucidation of the inheritance of traits in this species that hinder its use in breeding programmes is therefore of interest to wheat breeders. Inheritance of threshability was investigated in the crosses of four non-free-threshing (NFT) synthetic hexaploids (Triticum turgidum×T. tauschii) and two free-threshing (FT) T. aestivum cultivars during four crop seasons over 3 years at E1 Batan and Ciudad Obregon, Mexico. The parents, their F1 Hybrids and individual F2 plant-derived F3 progenies of the crosses revealed that ‘Altar 84’/T. tauschii (219), ‘Chen’/T. tauschii (205), ‘Chen’/T. tauschii (224), and ‘Duergand’/T. tauschii (214) have independently segregating loci with two dominant alleles controlling threshability. Intercrosses among the synthetics, except ‘Altar 84’/T. tauschii (219), showed the genes to be allelic to each other. The cross between the FT cultivars showed no segregation in the F3 generation, indicating common recessive genes. Based on these findings, population sizes of the synthetic-derived breeding materials should be increased to improve the chances of selecting FT desirable plants in the programme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1996.tb00942.x
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  • 5
    Digitale Medien
    Digitale Medien
    The Effect of Chromosome 1B/1R Translocation on the Yield Potential of Certain Spring Wheats (Triticum aestivum L.) (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 106 (1991), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Nearly 50 percent of the 1988 advanced breeding lines of the CIMMYT bread wheat breeding program possess the 1B/1R homozygous translocation. Hence, a trial was conducted to estimate the effect of 1B/1R chromosome translocation on the yield potential of some of our high-yielding spring wheats, where non-limiting levels of fertility, moisture, preventive pest and disease programs were used. In conclusing the 1B/1R lines seemed to have increased their above-ground biomass yield, number of spikes per meter2, 1000-grain weight and test weight. They also exhibited a slight advantage over the 1B homozygous lines on grain yield. The observed difference, however, was non-significant, as was the plant height difference observed among the two groups. Varietal comparisons indicated that the 1B/1R group headed later than the 1B group.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1991.tb00482.x
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  • 6
    Digitale Medien
    Digitale Medien
    Resistance to Karnal Bunt (Tilletia indica Mitra) in Synthetic Hexaploid Wheats Derived from Triticum turgidum×T. tauschii (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 112 (1994), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Synthetic hexaploids (SH) developed at the International Maize and Wheat Improvement Center (CIMMYT), involving four Triticum turgidum and nine T. tauschii parents, were evaluated for resistance to Karnal bunt (KB) (Tilletia indica Mitra) during three crop seasons over three years at Ciudad Obregon, Sonora, Mexico. Ten tillers of each SH at boot stage, taken at random, were injected with a suspension of sporidia in water (10,000 spores/ml of water). At maturity the inoculated spikes were threshed individually and evaluated for the percentage KB-infected grains. Based on the mean KB score of each entry for three seasons, 49 % of the SH were immune (0 % infection) to KB. Highly resistant expressions characterized the SH which appeared to be influenced by the resistance of their T. turgidum and/or T. tauschii parents. The overall mean infection of the SH wheats was 0.24 % compared to 56.14 % in the susceptible bread wheat check cultivat ‘WL711’. Transfer of KB resistance genes from SH wheats into bread wheat is currently underway at CIMMYT.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1994.tb01277.x
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  • 7
    Digitale Medien
    Digitale Medien
    Cytogenetics of a Hordeum vulgare x Elymus patagonicus hybrid (n=4x=28) (1985)
    Springer
    Theoretical and applied genetics 69 (1985), S. 475-479 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Hordeum vulgare ; Elymus patagonicus ; Intergeneric hybridization ; Genome analysis ; Autosyndetic pairing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Hordeum vulgare L. (2n=2x=14) was hybridized with Elymus patagonicus Speg. (2n=6x=42). The hybrid had 28 chromosomes, genomically represented as HSH1H2, and was perennial with a codominant phenotype. The chromosomes were meiotically associated as 19.6 univalents + 0.004 ring bivalents + 2.6 rod bivalents + 0.8 trivalents + 0.14 quadrivalents in 1,129 meiocytes, with a chiasma frequency of 4.77 per cell. The bivalent pairing presumably is an autosyndetic but modified expression of the H1H2 genomes of E. patagonicus, since ring bivalents were rare. This does not preclude the association of the H. vulgare H genome chromosomes with either H1 and/or H2 genomes of E. patagonicus to form bivalent or multivalent associations. A further evaluation of the genome homologies of H. vulgare, H. bogdanii, E. canadensis and E. patagonicus is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00251087
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  • 8
    Digitale Medien
    Digitale Medien
    Seed protein and isozyme variations in Triticum tauschii (Aegilops squarrosa) (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 257-263 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Triticum tauschii ; Genetic variability ; HMW-glutenins ; Gliadins ; Isozymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Sixty Triticum tauschii (Aegilops squarrosa, 2n=2x=14, DD) accessions were evaluated for the variability of high-molecular-weight (HMW) glutenins, gliadins and isozymes of seed esterase, β-amylase and glucose-phosphate isomerase. Wide variability was observed for HMW-glutenins and gliadins. The implications of unique HMW-glutenin alleles for quality parameters are discussed. Isozyme evaluations indicated more variability for the Est-D t 5 locus as compared to the Est-D5 of bread-wheat. The polymorphism for β-Amy-D t 1 was less than that of β-Amy-D1. Similar to the bread-wheat situation, Gpi-D t 1 showed no polymorphism. The variability observed with the traits evaluated can be readily observed in T. turgidum x T. tauschii synthetic hexaploids (2n=6x=42, AABBDD) suggesting that T. tauschii accessions may be a rich source for enhancing the genetic variability of T. aestivum cultivars.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00223774
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  • 9
    Digitale Medien
    Digitale Medien
    Production and cytogenetics of Triticum aestivum L. hybrids with some rhizomatous Agropyron species (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 162-168 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Triticum aestivum ; Agropyron ; (Elytrigia, Thinopyrum) ; Intergeneric hybridization ; Crossability ; Wide crosses
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Intergeneric hybrids between Triticum aestivum L. and conventional rhizomatous Agropyron species were produced in variable frequencies. They were recovered in high percentage frequencies for T. aestivum cultivars with A. acutum (14.6%), A. intermedium (48.0%), A. pulcherrimum (53.3%), and A. trichophorum (46.6%). The crossability percentages with the highly crossable cultivar ‘Chinese Spring’ for these Agropyron species accessions were 33.12%, 65.0%, 53.3%, and 65.4%, respectively. Autosyndetic associations of two of their three genomes gave mean meiotic chromosome association data of 17.0 I (univalents) +1.53 II (ring bivalents) + 7.04 II (rod bivalents) +1.43 III (trivalents) +0.05 IV (quadrivalents) +0.01 IV (pentavalents) for A. acutum and of 21.8 I + 1.56 II (rings) +7.22 II (rods) +0.84 III + 0.04 IV for A. intermedium. Chromosome pairing at metaphase I was comparatively lower for A. pulcherrimum (34.4 I + 0.2 II (rings) +3.4 II (rods) +0.14 III) and A. trichophorum (36.7 I + 0.35 II (rings) +2.26 II (rods) + 0.04 III) hybrids with T. aestivum. Hybrids of wheat with A. campestre and A. repens were obtained in low frequency. Direct crossing did not permit T. aestivum/ A. desertorum hybridization. However, by utilizing the 2n=10x=70 A. repens/A. desertorum amphiploid as the pollen source, hybridization with T. aestivum did indeed occur. Aneuploidy was prevalent in this hybrid combination while all other hybrid combinations were apparently normal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00266181
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  • 10
    Digitale Medien
    Digitale Medien
    Isozyme and cytological markers of some Psathyrostachys juncea accessions (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 528-534 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Psathyrostachys juncea ; Triticum aestivum ; Isozyme markers ; Chromosome banding ; Intergeneric hybridization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Psathyrostachys juncea (synonymous to Elymus junceus; 2n=2x=14, NN) has unique biotic and abiotic attributes that could contribute towards wheat improvement. The effectiveness of such an intergeneric hybridization program depends greatly on being able to establish diagnostic markers of the alien chromosomes. Isoelectric focusing (IEF) analyses of six enzyme systems have identified five biochemical markers — malate dehydrogenase (MDH), esterase (EST), shikimate dehydrogenase (SKDH), phosphoglucomutase (PGM), and β-amylase (β-AMY) — to be of positive diagnostic value; glucosephosphate isomerase (GPI) banding profiles were of no definite value in the background of Triticum aestivum cvs ‘Chinese Spring’ and ‘Seri-82’, the potential recipients of Ps. juncea chromosomes. The Giemsa C-banding karyotype distinctively separates the Ps. Juncea chromosomes from each other and from those of T. aestivum with little banding site polymorphisms prevalent among its accessions analyzed, indicating the usefulness of C-bands as cytological markers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00224148
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