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Scholarly Works (4 results)

  • Thesis
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UC Riverside Electronic Theses and Dissertations (2009)

Bread wheat (Triticum aestivum L.) is the second most cultivated cereal crop after rice. Many present day bread wheats carry a centric rye-wheat translocation 1RS.1BL in place of chromosome 1B. The increased grain yield of translocation lines is positively associated with root biomass. To map loci controlling root characteristics, homoeologous recombinants of 1RS with 1BS were used to generate an integrated genetic map comprised of 20 phenotypic and molecular markers, with an average spacing of 2.5 cM. To identify the chromosomal region associated with rooting ability, root phenotypic data were subjected to Quade analysis to compare genotypes. The distal 15% of the rye 1RS arm may carry QTL for greater rooting ability in bread wheat.

To identify QTL for individual root traits, a phenotyping experiment was conducted involving recombinants from each marker interval of the 1RS-1BS genetic map. An empirical Bayes method was applied to estimate additive and epistatic effects for all possible marker pairs simultaneously in a single model. This method has an advantage for QTL analysis in minimizing the error variance and detecting interaction effects between loci with no main effect. Four common regions were identified to involve a total of 15 QTL effects, six additive and nine epistatic, for different root traits in 1RS wheat. Three of four regions were localized in the distal 15% of the 1RS arm.

The effect of different dosages (0 to 4) of the 1RS translocation on root morphology and anatomy in bread wheat was determined. The F1 hybrid with single dose of 1RS and 1AS arms showed heterosis for root and shoot biomass. Root biomass was positively associated with increase in dosage of 1RS. This study also provided evidence of the presence of gene(s) influencing root anatomical traits. The central metaxylem vessel diameter was negatively associated with increasing 1RS dosage. Wheat genotypes with higher number of 1RS translocation arms may have inherent morphological and anatomical advantage over normal bread wheat to survive under stress conditions.

    Cover page: Characterization of Quantitative Loci for Morphological and Anatomical Root Traits on the Short Arm of Chromosome 1 of Rye in Bread Wheat
    • Article
    • Peer Reviewed
    UC Riverside Previously Published Works (2009)
    A rye–wheat centric chromosome translocation 1RS.1BL has been widely used in wheat breeding programs around the world. Increased yield of translocation lines was probably a consequence of increased root biomass. In an effort to map loci-controlling root characteristics, homoeologous recombinants of 1RS with 1BS were used to generate a consensus genetic map comprised of 20 phenotypic and molecular markers, with an average spacing of 2.5 cM. Physically, all recombination events were located in the distal 40% of the arms. A total of 68 recombinants was used and recombination breakpoints were aligned and ordered over map intervals with all the markers, integrated together in a genetic map. This approach enabled dissection of genetic components of quantitative traits, such as root traits, present on 1S. To validate our hypothesis, phenotyping of 45-day-old wheat roots was performed in five lines including three recombinants representative of the entire short arm along with bread wheat parents ‘Pavon 76’ and Pavon 1RS.1BL. Individual root characteristics were ranked and the genotypic rank sums were subjected to Quade analysis to compare the overall rooting ability of the genotypes. It appears that the terminal 15% of the rye 1RS arm carries gene(s) for greater rooting ability in wheat.
      Cover page: Integrated genetic map and genetic analysis of a region associated with root traits on the short arm of rye chromosome 1 in bread wheat
      • Article
      • Peer Reviewed
      UC Riverside Previously Published Works (2010)
      The spontaneous translocation of the short arm of chromosome 1 of rye (1RS) in bread wheat is associated with higher root biomass and grain yield. Recent studies have confirmed the presence of QTL for different root morphological traits on the 1RS arm in bread wheat. This study was conducted to address two questions in wheat root genetics. First, does the presence of the 1RS arm in bread wheat affect its root anatomy? Second, how does root morphology and anatomy of bread wheat respond to different dosages of 1RS? Near-isogenic plants with a different number (0 to 4 dosages) of 1RS translocations were studied for root morphology and anatomy. The F(1) hybrid, with single doses of the 1RS and 1AS arms, showed heterosis for root and shoot biomass. In other genotypes, with 0, 2, or 4 doses of 1RS, root biomass was incremental with the increase in the dosage of 1RS in bread wheat. This study also provided evidence of the presence of gene(s) influencing root xylem vessel number, size, and distribution in bread wheat. It was found that root vasculature follows a specific developmental pattern along the length of the tap root and 1RS dosage tends to affect the transitions differentially in different positions. This study indicated that the inherent differences in root morphology and anatomy of different 1RS lines may be advantageous compared to normal bread wheat to survive under stress conditions.
        Cover page: Dosage effect of the short arm of chromosome 1 of rye on root morphology and anatomy in bread wheat
        • Article
        • Peer Reviewed
        UC Riverside Previously Published Works (2011)
        A high-resolution chromosome arm-specific mapping population was used in an attempt to locate/detect gene(s)/QTL for different root traits on the short arm of rye chromosome 1 (1RS) in bread wheat. This population consisted of induced homoeologous recombinants of 1RS with 1BS, each originating from a different crossover event and distinct from all other recombinants in the proportions of rye and wheat chromatin present. It provides a simple and powerful approach to detect even small QTL effects using fewer progeny. A promising empirical Bayes method was applied to estimate additive and epistatic effects for all possible marker pairs simultaneously in a single model. This method has an advantage for QTL analysis in minimizing the error variance and detecting interaction effects between loci with no main effect. A total of 15 QTL effects, 6 additive and 9 epistatic, were detected for different traits of root length and root weight in 1RS wheat. Epistatic interactions were further partitioned into inter-genomic (wheat and rye alleles) and intra-genomic (rye-rye or wheat-wheat alleles) interactions affecting various root traits. Four common regions were identified involving all the QTL for root traits. Two regions carried QTL for almost all the root traits and were responsible for all the epistatic interactions. Evidence for inter-genomic interactions is provided. Comparison of mean values supported the QTL detection.
          Cover page: Dissection of QTL effects for root traits using a chromosome arm-specific mapping population in bread wheat
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