Localized expression of a proline-rich protein gene in juvenile and mature ivy petioles in relation to rooting competence [Hedera helix]

acido naftilacetico cal callo callus cell division cultivo in vitro culture in vitro division cellulaire enracinement enraizamiento estado juvenil de las plantas floema gene expression hedera in vitro culture juvenility of plants naa peciolo petioles phloem prolina proline rooting