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PubMed1987

Chromosomal location of genes coding for endosperm proteins of Hordeum chilense, determined by two-dimensional electrophoresis of wheat-H. chilense chromosome addition lines.

The proteins of Hordeum chilense grain were resolved into 25 major components by two-dimensional electrophoresis. Their solubilities in aqueous alcohol solutions were determined to distinguish prolamin storage proteins from metabolic and structural proteins. The prolamins were divided into two groups, based on the presence or absence of intermolecular disulfide bonds determined by gel-filtration chromatography. Using an incomplete set of Chinese Spring wheat-H. chilense disomic addition lines, the structural genes of 21 of the 26 most dominant seed proteins were assigned to chromosomes. The great majority of the prolamin genes, including those coding for a high molecular weight (HMW) prolamin subunit, was present on chromosome 1 Hch. However, a small number of prolamin genes also occurred on chromosomes 5 Hch and 7 Hch. A minor protein, probably belonging to the nonstorage group of proteins, is coded by genes on 5 Hch. Various ditelosomic addition lines and ditelosomic and disomic substitution lines for chromosome 7 Hch were also analyzed by electrophoresis. This technique revealed that the genes for three major prolamins occur on the beta arm of chromosome 7 Hch and that a gene for a minor protein, also thought to be a prolamin, occurs on the alpha arm. These results are discussed in relation to the evolution of prolamin genes in the Triticeae.

Chromosome Mapping↗
PubMed2026

Novel genomic regions associated with adult-plant resistance to multiple fungal pathogens in wheat (Triticum aestivum L.) revealed by DArT marker sequencing.

Wheat is among the top three most important cereal crops globally and serves as a staple food for approximately 40% of the world's population. Fungal leaf diseases such as yellow and leaf rusts (YR, LR), septoria nodorum blotch (SNB), septoria tritici blotch (STB), and powdery mildew (PM) have a major effect on yield loss in wheat, and resistance breeding is so far the most effective strategy to minimize those losses. Adult plant resistance (APR) is a crucial component of durable disease resistance; it reduces the pathogen's infection rate, keeping disease levels below the damage threshold, even in the absence of complete immunity. Therefore, this study aimed to identify sources of resistance in a collection of 411 accessions from diverse global origins. These accessions were phenotyped across 2018-2019. DArTseq technology and Genome-wide association studies (GWAS) analysis were conducted to identify single-nucleotide polymorphisms (SNPs) associated with APR for evaluated pathogens. DArT analysis showed that wheat chromosome 2B contains genomic regions associated with resistance to SNB, and that SNPs on chromosome 3B are associated with resistance to YR. On chromosome 6 A, there is a strong potential to explore, as a shared resistance locus for YR and SNB was found. SNPs: 3,937,236, 1,056,817 were consistent in both years, meaning their association with disease resistance is reliable and repeatable. Chromosome 7D is a strong region for SNPs significantly associated with both LR and SNB resistance. While multiple disease resistance genes are present on 7D, the 610 Mb LR locus is distinct from known LR, PM, and SNB loci, making it a strong candidate for functional validation. These findings highlight the value of historical resistance sources and uncover novel genomic regions for breeding a broad-spectrum APR-based resistance. Dual-trait loci, especially those effective against both biotrophic and necrotrophic pathogens, represent a promising material for achieving durable resistance in elite wheat cultivars.

Triticum↗
PubMed1998

A broiler chick bioassay for measuring the feeding value of wheat and barley in complete diets.

Energy is an important component of poultry feed and is derived principally from cereal grains. Unfortunately, all of the chemical energy is not available to the bird, and biological assays must be used to determine the digestible energy value of a cereal grain. The bioassay described uses four pens of six male broiler chicks, complete diets containing 80% of a test cereal grain (with or without an appropriate commercial enzyme), and ad libitum feed intake. Apparent metabolizable energy values (kilocalories per kilogram of cereal grain, DM basis) values are calculated from gross energy and acid insoluble ash measurements of diet and excreta collected for 24 h at 16 d of age. To monitor variation between broiler chick assays, due to bird, environment, etc., common control samples of Hard Red Spring (HRS) and Canadian Prairie Spring (CPS) wheat were tested in each of 15 separate assays over 2 yr. Similarly, for barley, control samples of hulled and hulless barley were repeatedly tested in five assays. Broiler performance in this study was lower than expected for commercial broilers, in part due to a high dietary cereal grain component and the fine mash texture. However, AME values as determined were comparable to those reported in the literature for wheat and barley. The CV for AME measured among pens, representing the intra-assay CV, was between 1.2 and 3.4% and was lower with enzyme supplementation. The interassay CV was only slightly higher than the intra-assay CV. This assay provides precise estimations of ME in cereal grains fed to young broilers that can be used for diet formulation or for verification of laboratory measures of feeding value of cereal grains.

Animal Feed↗
PubMed2003

[Development and application of a genome specific PCR marker for Haynaldia villosa].

Random amplified polymorphic DNA (RAPD) analysis was performed on common wheat Chinese Spring, H. villosa, addition lines of H. villosa chromosome in CS, substitution line 3V of H. villosa chromosome in Triticum aestivum. A genome specific polymorphic DNA segment from H. villosa, OPF02757, was obtained. On the basis of cloning and sequencing of OPF02757, two PCR primers were designed and a genome specific PCR marker for H. villosa was established. The PCR marker including 677 bp was localized on all the seven pairs of H. villosa chromosomes. The result of PCR amplification by the primers indicated that there was a specific band of 677 bp in the materials containing H. villosa Chromosome such as T. aestivum-H. villosa addition, T. aestivum-H. villosa substitution, T. aestivum-H. villosa amphidiploid, T. durum-H. villosa amphidiploid and H. villosum from different accessions, and there was no specific band of 677 bp if the materials did not contain H. villosa chromosome, such as T. aestivum, T. durum, Secale cereale, Hordeum vulgare, Thinopyrum elongatum, Thinopyrum intermedium. Therefore, the PCR maker of 677 bp is specific to H. villosa genome, and could be used as molecular marker for detection of chromosomes of H. villosa in wheat.

Base Sequence↗
PubMed2003

Genetics of growth habit (spring vs winter) in common wheat: confirmation of the existence of dominant gene Vrn4.

The number of dominant Vrn genes in common wheat, Triticum aestivum L., is estimated. Data were obtained supporting Pugsley's and Gotoh's data on the presence of a dominant gene Vrn4 in near-isogenic line 'Triple Dirk F'. The presence of a dominant gene Vrn4 in line 'Gabo-2' of cultivar 'Gabo', which was used by Pugsley as a donor of the gene Vrn4 for the near-isogenic line 'Triple Dirk F', was also confirmed. The Vrn2 and Vrn4 relationship and their chromosomal location are discussed. It was demonstrated that the dominant Vrn8 gene which was introgressed from Triticum sphaerococcum to common wheat by Stelmakh and Avsenin is allelic to Vrn4. While genes Vrn6(sc) and Vrn7(sc) which were introgressed from rye, Secale cereale L., by the above-mentioned authors are not allelic to the genes Vrn1, Vrn2, Vrn3 and Vrn4.

Alleles↗
PubMed2003

[Epigenetic variability induced by nicotinic acid in Triticum aestivum L].

The effect of nicotinic acid (NA) on hereditary traits of spring common wheat cultivar Kazakhstanskaya 126 (K.126) were studied under the laboratory and field conditions. Treatment of seeds and vegetating plants with 0.01-0.1% NA (aqueous solution) induced heritable epigenetic changes in wheat. As a result, strong tall plants with the long productive spike, large seeds, and several quantitative and qualitative characters other than in the original cultivar were obtained in the second and further generations after treatment. Crosses of changed plants with each other did not result in segregation with respect to leaf downiness or anthocyan stem color in F2-F4, suggesting the same epigenetic state of genes responsible for changed characters. In crosses with the original cultivar, characters of the changed plants always dominated in F1. Basing on the current views, the changes were attributed to a transition of the hl1 and pc recessive marker genes into new, dominant epiallelic states Hl1 and Pc, which respectively determine downy leaves and the colored stem. The NA effect was specific, since only one type of the variation was observed. The changed characters were stable, and no reversion to the original phenotype was detected in 57 generations.

Genes, Plant↗
PubMed2000

Cancer mortality in four northern wheat-producing states.

Chlorophenoxy herbicides are used both in cereal grain agriculture and in nonagricultural settings such as right-of-ways, lawns, and parks. Minnesota, North Dakota, South Dakota, and Montana grow most of the spring and durum wheat produced in the United States. More than 90% of spring and durum wheat is treated with chlorophenoxy herbicides, in contrast to treatment of approximately 30% of winter wheat. In this ecologic study I used wheat acreage as a surrogate for exposure to chlorophenoxy herbicides. I investigated the association of chlorophenoxy herbicides with cancer mortality during 1980-1989 for selected counties based on level of agriculture ([greater and equal to] 20%) and rural population ([greater and equal to] 50%). Age-standardized cancer mortality rates were determined for grouped counties based on tertiles of wheat acreage per county or for individual counties for frequently occurring cancers. The cancer sites that showed positive trends of increasing cancer mortality with increasing wheat acreage were esophagus, stomach, rectum, pancreas, larynx, prostate, kidney and ureter, brain, thyroid, bone, and all cancers (men) and oral cavity and tongue, esophagus, stomach, liver and gall bladder and bile ducts, pancreas, cervix, ovary, bladder, and other urinary organs, and all cancers (women). Rare cancers in men and women and cancers in boys and girls were studied by comparing counties above and below the median of wheat acreage per county. There was increased mortality for cancer of the nose and eye in both men and women, brain and leukemia in both boys and girls, and all cancers in boys. These results suggest an association between cancer mortality and wheat acreage in counties of these four states.

Adolescent↗
PubMed2002

Vernalization-induced changes of the DNA methylation pattern in winter wheat.

Vernalization is a cold treatment that induces or accelerates flowering and insures that temperate-zone plants will not flower until after winter. There is evidence that vernalization results in DNA demethylation that induces flowering. Differences in DNA methylation can be determined using methylation-sensitive amplified fragment length polymorphisms (AFLPs). Methylation-sensitive AFLPs utilize restriction enzyme isoschizomers that are differentially sensitive to methylation, producing polymorphisms related to methylation differences as opposed to sequence differences. Near-isogenic lines (NILs) have been developed for spring vs. winter habit in wheat (Triticum aestivum) and allow for the study of a single vernalization locus. In this study, differences in the methylation pattern were determined for spring and winter NILs, as well as for unvernalized and vernalized individuals. Winter wheat was more highly methylated than spring wheat and methylation-related AFLPs were produced between winter and spring wheat. Changes in the methylation pattern were observed at the end of vernalization, one week after the end of vernalization, and four weeks after the end of vernalization of winter wheat. However, the most methylation differences were observed one week after removal of winter wheat from cold treatment. Our data suggest that there is not only a vernalization-induced demethylation related to flower induction, but there is also a more general and non-specific demethylation of sequences unrelated to flowering. Two methylation-related AFLPs induced by vernalization were shared among all of the winter NILs.

Cold Temperature↗
PubMed1999

[Chromosomal location of the genes conferring the tolerance to phosphorus deficiency stress in Lophopyrum elongatum genome] [In Process Citation]

Identification and genetic analysis were conducted on the tolerance to phosphorus deficiency stress by using a set of alien disomic addition lines (DA lines) and disomic substitution lines (DS lines) of common wheat Chinese Spring-Lophopyrum elongatum (2n = 2x = 14, EE), a closely related wheat species. The results indicated that chromosomes 4E and 6E in L. elongatum may carry the genes conferring the tolerance to phosphorus deficiency stress with much stronger effect over the background parent Chinese Spring. DA lines derived from chromosomes 2E and 3E behaved quite different from the corresponding DS lines. Although DA2E and DA3E were susceptible to phosphorus deficiency, the DS lines performed much better than Chinese Spring, DA2E and DA3E under both control and the deficiency conditions. However, the strongly repressed stress tolerance was located on chromosome 5E. In addition, the possible reasons for the different reponses to phosphorus deficiency between DA and DS lines of chromosomes 2E and 3E are discussed.

Journal Article↗
PubMed2002

Molecular characterization and chromosomal localization of cytochrome P450 genes involved in the biosynthesis of cyclic hydroxamic acids in hexaploid wheat.

The cyclic hydroxamic acids, 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA) and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), are defensive secondary metabolites found in gramineous plants including wheat, maize and rye. cDNAs for five cytochromes P450 (P450s) involved in DIBOA biosynthesis (CYP71C6, CYP71C7v2, CYP71C8v2, CYP71C9v1 and CYP71C9v2) were isolated from seedlings of hexaploid wheat [( Triticum aestivum L. cv. Chinese Spring (2n=6x=42, genomes AABBDD)] by RT-PCR and screening of a cDNA library. CYP71C9v1 and CYP71C9v2 are 97% identical to each other in amino acid and nucleotide sequences. The cloned P450 species showed 76-79% identity at the amino acid level to the corresponding maize P450 species CYP71C1-C4, which are also required for DIBOA biosynthesis. The wheat P450 cDNAs were heterologously expressed in the yeast ( Saccharomyces cerevisiae) strain AH22. Microsome fractions from yeast cells expressing these P450 species catalyzed the same reactions as their maize orthologs. The chromosomes carrying the cyp71C6- C9v1 orthologs were identified by Southern hybridization using aneuploid lines of Chinese Spring wheat. The cyp71C9v1 orthologs were located on the chromosomes of wheat homoeologous group-4. The orthologs of the other P450 genes, cyp71C7v2, cyp71C6 and cyp71C8v2, were located on group-5 chromosomes. The same P450 genes were also present in the three ancestral diploid species of hexaploid wheat, T. monococcum (AA), Aegilops speltoides [BB (approximately SS)] and Ae. squarrosa (DD).

Amino Acid Sequence↗
PubMed1994

A family of related sequences associated with (TTTAGGG)n repeats are located in the interstitial regions of wheat chromosomes.

A family of related sequences associated with (TTTAGGG)n repeats has been cloned from the wheat cultivar Chinese Spring. These sequences reveal a high level of polymorphism between wheat varieties when used as restriction fragment length polymorphism (RFLP) probes. Although this family of sequences contains motifs homologous to the repeats in the telomeres of wheat, they are located at interstitial sites on wheat chromosomes.

Blotting, Southern↗
PubMed1979

Evidence for a triplicate set of glucosephosphate isomerase structural genes in hexaploid wheat.

The glucosephosphate isomerase (GPI)zymogram phenotypes of 46 aneuploid derivatives of the cultivar Chinese Spring of hexaploid wheat were determined. Variation was observed among the strains in the relative level of expression of three GPI isozymes. The relationships observed between chromosomal constitution and zymogram phenotype support the hypothesis that the three GPI isozymes are dimers composed of protomers encoded by a minimum of three homoeologous structural genes located one each in the short arms of chromosomes 1A, 1B, and 1D. The relative levels of expression per dose of chromosome arm of the products of the three arms differ in a manner consistent with the presence of a two-fold greater quantity of the product of 1BS than of the product of 1AS and of 1DS, indicating that 1BS may contain duplicate GPI structural genes.

Chromosome Mapping↗
PubMed1988

DNase I sensitivity of ribosomal RNA genes in chromatin and nucleolar dominance in wheat.

Ribosomal RNA genes at different nucleolar organizer (NOR) loci in hexaploid wheat are expressed at different levels. The degree of expression of a particular organizer depends on the genetic background, especially on the presence of other NOR loci. For example, when chromosome 1U of Aegilops umbellulata is introduced into the hexaploid wheat cultivar "Chinese Spring" the A. umbellulata NOR accounts for most of the nucleolar activity and seems to suppress the activity of the wheat NOR loci. Even in wild-type "Chinese Spring", the NOR on chromosome 1B is partially dominant to that on chromosome 6B, since the 1B locus is more active in spite of having fewer genes. We have previously shown that these and other examples of nucleolar dominance in wheat are associated with undermethylation of cytosine residues in certain regions of the dominant rDNA. Here, we show that rRNA genes at dominant loci are organized in a chromatin conformation that renders them more sensitive to DNase I digestion than other rRNA genes. In addition, we have mapped several DNase I-hypersensitive sites in the intergenic spacer region of the rDNA repeating unit. Some of these sites are located near the initiation region for the 45 S rRNA precursor, while others are associated with a series of short direct repeats 5' to the 45 S rRNA initiation site. The results are discussed in terms of a model in which repeated sequences in the wheat intergenic DNA are presumed to function as upstream promoters and transcriptional enhancers similar to those in Xenopus.

Binding Sites↗
PubMed2000

[Dynamics of soil P pool in a long-term fertilizing experiment of wheat-maize rotation. I. Crop yield effect of fertilizer P and dynamics of soil total P and inorganic P].

The effects of long-term applying fertilizer P and manure on the pools of soil total P and inorganic P and the crop yield in rotation of winter wheat-summer maize-->spring maize were studied. The results showed that the pool of soil total P and inorganic P were increased by applying fertilizer P and manure, and the phosphorus mostly accumulated in soil was inorganic P. The critical amounts of fertilizer P (P2O5) for balancing soil P were 94.7 kg.hm-2 to winter wheat-summer maize and 51.5 kg.hm-2 to spring maize. Based on regression equations, the application rates of fertilizer P (P2O5) for economic optimum and highest yields were 135.8 and 149.8 kg.hm-2 to winter wheat-summer maize, and 88.6 and 95.9 kg.hm-2 to spring maize, respectively.

China↗
PubMed2003

Proteome analysis of diploid, tetraploid and hexaploid wheat: towards understanding genome interaction in protein expression.

Hexaploid wheat (Triticum aestivum L.) is derived from a complex hybridization procedure involving three diploid species carrying the A, B and D genomes. The proteome patterns of diploid, tetraploid and hexaploid wheat were analyzed to explore the genome interaction in protein expression. At least two species from each of the diploid and tetraploid were used to compare their proteome maps with a hexaploid wheat cv. Chinese Spring. The ancestral cultivars were selected based on their history of closeness with the cultivated wheat. Proteins were extracted from seed flour and separated by two-dimensional electrophoresis (2-DE) with isoelectric focusing of pH range from 4-10. 2-DE maps of cultivated and ancestral species were analyzed by computer assisted image analyzer. The region of high molecular weight glutenin subunits of hexaploid wheat showed similarity with those of the diploid donors, BB and DD genomes. The omega gliadin, which is controlled by B genome in common wheat, was assumed to have evolved as a result of interaction between AA and BB genomes. The low molecular weight glutenins and alpha and beta gliadin regions were contributed by the three genomes. This result suggests that the function of donor genomes particularly in the expression of proteins in hexaploid wheat is not totally independent; rather it is the product of interactions among the diploid genomes in the hexaploid nuclear constitutions. The expression of nonstorage proteins was affected substantially due to the removal of the D genome from hexaploid constitution. Location of the structural gene controlling one of the alpha amylase inhibitor proteins in the nonstorage protein region was identified in the short arm of chromosome 3D.

Chromosome Aberrations↗
PubMed2000

Compensating ability in pollen fertilization between group-6 and -7 homoeologous chromosomes of barley and wheat.

By using alpha-amylase isozymes as markers for chromosomes of homoeologous groups 6 and 7, we analyzed the segregation of chromosome constitution in the progenies from crosses between double-ditelosomic or ditelosomic lines of hexaploid wheat cultivar 'Chinese Spring' (CS) as the female parent and double-monosomic F1 hybrids of CS x wheat-barley substitution lines for barley chromosomes 6H or 7H. From this analysis we estimated the transmission rate via pollen of barley chromosomes 6H and 7H in the double-monosomics and evaluated the compensating ability between barley and wheat chromosomes in homoeologous groups 6 and 7. The results indicated that both 6H and 7H showed their highest compensating ability for their respective homoeologous wheat chromosomes 6A (37.5% transmission rate) and 7A (39.4%), intermediate for 6D (34.1%) and 7D (29.6%), and lowest for 6B (26.6%) and 7B (22.6%) chromosomes.

Chromosomes↗
PubMed2001

Dissipation and mobility of the sulfonylaminocarbonyl-triazolinone herbicide propoxycarbazone in the soil of winter wheat crops.

The new sulfonylaminocarbonyltriazolinone herbicide propoxycarbazone has been applied at the rate of 70 g ha-1 post-emergence in the spring on winter wheat fields located at three sites different as to their soil texture and composition. A method has been developed for the analysis of propoxycarbazone in soil by GC and GC-MS, after isolation and transformation of propoxycarbazone. The limit of sensitivity was 1 microgram propoxycarbazone kg-1 dry soil. In the sandy-loam soil at Melle, and in the clay-loam soil at Zevekote, the propoxycarbazone soil half-lives in the 0-10 cm surface soil layer were similar, i.e. about 54 days. In the loam soil at Cortil-Noirmont, the propoxycarbazone soil half-life was 31 days. The difference as to the soil half-lives was related to the organic fertilization practized in the past on the three fields. At Cortil-Noirmont, after the winter wheat harvest at the end of August, the residues of propoxycarbazone in the 0-10 cm surface soil layer were very low, and at the end of September, propoxycarbazone was no more detected. At Melle and Zevekote, at the end of September, the concentrations of propoxycarbazone in the 0-10 cm surface soil layer were very low; at the end of October, propoxycarbazone was no more detected. After its application and until the end of October, propoxycarbazone was not detected in the 10-15 and 15-20 cm surface soil layers.

Belgium↗