Role of D-genome chromosomes in photosynthesis expression in wheats |
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Authors: | B. Haour-Lurton C. Planchon |
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Affiliation: | (1) Photosynthèse et Amélioration des Plantes, Ecole Nationale Supérieure Agronomique, 145 avenue de Muret, F-31076 Toulouse Cédex, France |
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Abstract: | Summary 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. |
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Keywords: | Triticum D-genome Photosynthesis Flag leaves Irradiation |
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