The production of wheat--Aegilops sharonensis 1[S.sup.sh] chromosome substitution lines harboring alien novel high-molecular-weight glutenin subunits.

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Date: Mar. 2020
From: Genome(Vol. 63, Issue 3)
Publisher: NRC Research Press
Document Type: Article
Length: 5,909 words
Lexile Measure: 1520L

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Abstract :

In our previous work, a novel high-molecular-weight glutenin subunit (HMW-GS) with an extremely large molecular weight from Aegilops sharonensis was identified that may contribute to excellent wheat (Triticum aestivum) processing quality and increased dough strength, and we further generated HMW-GS homozygous lines by crossing. In this study, we crossed the HMW-GS homozygous line 66-17-52 with 'Chinese Spring' Phl mutant CS phlb to induce chromosome recombination between wheat and Ae. sharonensis. SDS-PAGE was used to identify 19 derived [F.sub.2] lines with the HMW-GSs of Ae sharonensis. The results of non-denaturing fluorescence in situ hybridization (ND-FISH) indicated that lines 6-1 and 6-7 possessed a substitution of both 5D chromosomes by a pair of 1[S.sup.sh] chromosomes. Further verification by newly developed 1[S.sup.sh]-specific chromosome markers showed that these two lines amplified the expected fragment. Thus, it was concluded that lines 6-1 and 6-7 are 1[S.sup.sh](5D) chromosome substitution lines. The 1[S.sup.sh](5D) chromosome substitution lines, possessing alien subunits with satisfactory quality-associated structural features of large repetitive domains and increased number of subunits, may have great potential in strengthening the viscosity and elasticity of dough made from wheat flour. Therefore, these substitution lines can be used for wheat quality improvement and further production of 1[S.sup.sh] translocation lines. Key words: Aegilops sharonensis, substitution line, Ph gene mutant, high-molecular-weight glutenin subunits, molecular markers. Dans leurs travaux precedents, les auteurs ont identifie une nouvelle sous-unite de glutenine de masse moleculaire elevee (HMW-GS) de tres grande masse chez l'Aegilops sharonensis, laquelle pourrait contribuer a produire un ble (Triticum aestivum) dote de meilleures proprietes pour la transformation et d'une meilleure resistance de la pate. Les auteurs ont egalement genere des lignees homozygotes HMW-GS par la voie de croisements. Dans ce travail, les auteurs ont croise la lignee homozygote 66-17-52 avec le mutant Ph1 de Chinese Spring (CS ph1b) pour produire des recombinants chromosomiques entre le ble et l'Ae. sharonensis. Des gels SDS-PAGE ont ete employes pour identifier 19 descendants [F.sub.2] porteurs de HMW-GS de l'Ae. sharonensis. Les resultats d'hybridations in situ en fluorescence en conditions non-denaturantes (ND-FISH) ont revele que les lignees 6-1 et 6-7 presentent une substitution des deux chromosomes 5D par une paire de chromosomes 1[S.sup.sh]. Des analyses additionnelles realisees au moyen de marqueurs specifiques du chromosome 1[S.sup.sh] nouvellement mis au point ont montre que les fragments attendus ont ete obtenus chez ces deux lignees. Les auteurs concluent donc que les lignees 6-1 et 6-7 sont des lignees de substitution 1[S.sup.sh](5D). Ces lignees de substitution chromosomique 1[S.sup.sh](5D) possedent des sous-unites d'origine interspecifique qui presentent des caracteristiques structurales associees a une meilleure qualite, soit la presence de grands domaines repetes et un nombre accru de sous-unites. Celles-ci permettront possiblement d'accroitre la viscosite et l'elasticite de la pate preparee a partir de farine de ble. Ainsi, ces lignees de substitution pourront servir a ameliorer la qualite du ble panifiable ainsi que pour la production de lignees de translocation 1[S.sup.sh]. [Traduit par la Redaction] Mots-cles : Aegilops sharonensis, lignee de substitution, mutant du gene Ph, sous-unites de glutenine de masse moleculaire elevee, marqueurs moleculaires.
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Gale Document Number: GALE|A617286626