Gérard Duc1, Pascal Marget1, Robert Esnault2, J. Le Guen2, Denis Bastianelli3
1Institut National de la Recherche Agronomique, Unité de Recherche en Génétique et Amélioration des Plants, BV1540-21034 Dijon Cédex, France
2Institut National de la Recherche Agronomique, Station de Génétique et Amélioration des Plantes, BP29-35650 Le Rheu, France
3Union Nationale Interprofessionnelle des Plantes Riches en Protéines, 12 avenue Georges V, 75008 Paris, France
Tóm tắt
In a preliminary experiment, 74 faba bean genotypes including winter genotypes (autumn-sown) and
spring genotypes (spring-sown) and isogenic population pairs (tannin-containing v. tannin-free and
vicine/convicine-high v. vicine/convicine-low), were analysed for the chemical composition of their
seeds. A large variability was found for the main constituents (starch, protein and fibre). Autumn-sown genotypes contained 2·3% less proteins but 2·5% more starch in the seed dry matter (DM) than
spring-sown genotypes. The vc− gene, which lowers the vicine and convicine contents, did not
significantly modify the main seed components in the isogenic comparisons. The zt1 and zt2 genes,
which eliminate condensed tannins in the seed coats, lowered by 2·1% the proportion of the seed coat
in the DM. In the isogenic comparisons, the zt2 gene had a stronger effect than zt1 in reducing the
total seed fibre and increasing the protein content.In a second experiment, from the original 74 genotypes, 12 contrasted genotypes were selected and
multiplied for animal nutrition trials. Their chemical analysis confirmed the variability between the
faba bean categories observed in Expt 1, but detailed chemical analyses illustrated the variability in
amino acid, fatty acid, amylose and oligosaccharide composition, trypsin inhibitory activity,
condensed tannins, lectins and phytic phosphorus contents.
