Genetic analysis of water-extractable arabinoxylans in bread wheat endosperm |
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| Authors: | J P Martinant T Cadalen A Billot S Chartier P Leroy M Bernard L Saulnier G Branlard |
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| Institution: | (1) Danone: – Tepral, F-67037 Strasbourg Cedex 02, France, FR;(2) INRA, Station d’Amélioration des Plantes, F-63039 Clermont Ferrand Cedex 02, France Fax: +33-4-73 62 44 53 E-mail: branlard@clermont.inra.fr, FR;(3) INRA, Unité de Biochimie et Technologie des Glucides, Rue de la Géraudière, BP 71627, F-44316 Nantes Cedex 03, France, FR |
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| Abstract: | Two mapping populations were used for the analysis of the water-extractable arabinoxylans. One originated from a cross between
the hexaploid cultivars ‘Courtot’ and ‘Chinese Spring’ and the other from a cross between an amphiploid (Synthetic) and cv
‘Opata’. Arabinose (Ara), and xylose (Xyl) contents were quantified for the 91 and 76 lines obtained from the two crosses,
respectively. Relative viscosity (ηrel) of the wheat flour aqueous extract was evaluated by capillary viscometry. Both crosses gave similar correlation coefficients
between sugar contents and relative viscosity. There were strong positive relationships between arabinose, xylose and arabinoxylan
contents. The relative viscosity was strongly and positively related to the arabinoxylan content and strongly and negatively
related to the Ara/Xyl ratio (arabinose content to xylose content). For one of the two crosses two measurements of relative
viscosity were generated from 2 years of consecutive harvesting. As a strong correlation was observed between these two measurements,
an important genotypic effect can be deduced for the relative viscosity of water-extractable arabinoxylans. QTL (quantitative
trait locus) research did not reveal any chromosomal segments that were strongly implicated in variations in sugar content.
However, a QTL was found for relative viscosity values and the Ara/Xyl ratio on the long arm of the 1B chromosome for the
two crosses considered. This QTL explained 32–37% of the variations in relative viscosity and 35–42% of the variations in
the Ara/Xyl ratio. Genes located at this QTL controlled relative viscosity through modifying the Ara/Xyl ratio. Variations
in the Ara/Xyl ratio were supposedly related to differences in the molecular structure of water-extractable arabinoxylans.
Minor QTLs were also obtained for relative viscosity and Ara/Xyl ratio, but the chromosomes concerned were different for the
two populations evaluated.
Received: 5 January 1998 / Accepted: 15 May 1998 |
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| Keywords: | Arabinoxylan Pentosan Viscosity QTL Wheat |
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