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Influence de la polenisation sur une pomme.

LACHETEAU
Auteur du sujet
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il y a 8 ans 7 mois #596 par LACHETEAU

Influence de la polenisation sur une pomme. a été créé par LACHETEAU

Bonjour,

Pour que le fruit se forme, il y a nécessité de la fécondation de la fleur par le pollen.
Dans une pomme , les pépins héritent donc du patrimoine génétique de l'arbre qui portait la fleur et de celui de l'arbre qui à fournit le grain de pollen.
QUESTIONS : Est-ce que les autres parties de la pomme sont influencées par le patrimoine génétique de ce grain de pollen ?
Génétiquement, les cellules du reste de la pomme sont-elles strictement identiques à l'arbre qui la porte ?
Pourquoi trouve t-on des différences (longueur du pédoncule, forme des cuvettes...etc.)sur les fruits d'un même arbre ?
Merci d'avance pour vos éclaircissements.
Cordialement
Frarob

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Henri Fourey
Hors Ligne
Administrateur

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il y a 8 ans 6 mois #605 par Henri Fourey

Réponse de Henri Fourey sur le sujet Influence de la pollinisation sur une pomme.

Bonjour,
Si on retrouve des différences "physiques" sur les fruits de deux arbres de même génome, ce qui est maintenant observé, pourquoi pas sur les fruits d'un même arbre, de plus chaque fruit rassemble bien deux sources de gènes différents, ce sont les différences d'expression des gènes de l'ADN qui induisent ces transformations (ou mutations ?) certains s'expriment, d'autres se taisent, l'épigénétique doit bientôt nous en expliquer les "aléas" et nous faire comprendre les hasards de la nature. A suivre, pour bien comprendre les difficultés de la description pomologique pour un non généticien (amateur).
Cordialement; H.F.

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