title: Role of D-genome chromosomes in photosynthesis expression in wheats.
abstract: The role of D-genome chromosomes in the expression of net photosynthesis in wheats was analysed with the nullitetrasomic and ditelosomic lines of the bread wheat cultivar 'Chinese Spring'. The two arms of chromosome 3 D and the short arm of chromosome 6 D control major mechanisms of photosynthesis. The effect of chromosome 6 D can be thoroughly compensated by that of its homoeologues of genomes A or B, contrary to what can be observed for chromosome 3 D. Chromosome 7 D is responsible for the low photosynthesis of flag leaves developed under high irradiances in genotypes possessing the D-genome, as the likely result of ontogeny or of a loss in adaptability to irradiance.
authors.affiliation: Photosynthèse et Amélioration des Plantes, Ecole Nationale Supérieure Agronomique, 145 avenue de Muret, F-31076, Toulouse Cédex, France.
authors.forename: B
authors.initials: B
authors.lastname: Haour-Lurton
authors.forename: C
authors.initials: C
authors.lastname: Planchon