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Leuco-anthocyanins in seeds

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Summary

When present in the leaves of a plant, leuco-anthocyanins are almost always present also in the seeds, but they may be present in the seeds although absent from the leaves. It is usually in the seed-coats that they are found, but occasionally (as in cacao) they are also present in the cotyledons. In legumes, leuco-anthocyanins when present (as they usually are) in the seed-coats can produce undesirable effects in food technology, but their presence or absence is under gene control and they can therefore be eliminated by breeding. In certain fruits, such as grapes, it is the leuco-anthocyanins in the seeds that are responsible in large degree for the tannin content of the fruit as a whole or of products made from them, and for this reason also they are important in commerce and technology.

Résumé

Lorsqu'ils sont présents dans les feuilles d'une plante les leuco-anthocyannes le sont aussi presque toujours dans les graines, mais ils peuvent être présents dans les graines quoique absents des feuilles. On les rencontre généralement dans les enveloppes des graines mais aussi quelque fois dans les cotylédons (dans le cacao par exemple). Dans les légumes les leuco-anthocyannes, quand ils sont présents (ce qui est généralement le cas), dans les enveloppes des graines peuvent produire des effets indésirables en technologie alimentaire; mais leur présence ou leur absence étant sous le contrôle de gênes, ils peuvent être éliminés par croisements. Dans certains fruits, comme les raisins, ce sont les leuco-anthocyannes des graines qui sont pour une grande part, responsables de la teneur en tannin du fruit dans son ensemble ou des produits à la fabrication desquels ils servent; pour cette raison aussi les leuco-anthocyannes sont importants au point de vue commercial et économique.

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Bate-Smith, E.C., Ribéreau-Gayon, P. Leuco-anthocyanins in seeds. Plant Food Hum Nutr 5, 189–198 (1959). https://doi.org/10.1007/BF01100181

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