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Etude comparéd de l’action de la benzylaminopurine et de l’acide gibbérellique sur l’absorption du phosphate par des disques de feuille dePelargonium zonale (L.) Aiton. Effects de l’âge et de la température

Comparative study of the influence of BAP and GA3 on the absorption of phosphate byPelargonium zonale leaf discs. Effects of age and temparature

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Biologia Plantarum

Abstract

The absorption of32P-phosphate (KH2PO4-0.1 mM) was studied with discs ofPelargonium zonale leaves, in relation to the age of the leaf, to the ageing process and in relation to the influence of GA3 and BAP. The results show that: i) the speed of absorption reaches a maximum which is characteristic of the adult phase (stage); ii) the “ageing” (washing during 24 h) induces a general increase in the absorption velocity which is dependent on the temperature of the ageing medium (optimum at 26 °C). On the other hand, ageing appears to be a process able to increase the physiological differences which are present before “ageing”. This phenomenon also appears in the case of the influence of phytohormones; iii) if BAP exercises a dose-dependent inhibitory action, in contrast, GA3 acts by increasing the velocity of the absorption which appears to be a process independent of the hormone concentration.

These results underline a phytohormonal specificity.

All these results are discussed in relation to hormone-directed transport, cell permeability and leaf senescence.

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Authors and Affiliations

  1. Laboratoire de Physiologie Végétale Faculté dea Sciences, Université de Bretagne Occidentale, 6 avenue Victor Le Gorgeu, 29283, Brest Cédex, France

    J. Beraud & M. Penot

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  1. J. Beraud
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  2. M. Penot
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Beraud, J., Penot, M. Etude comparéd de l’action de la benzylaminopurine et de l’acide gibbérellique sur l’absorption du phosphate par des disques de feuille dePelargonium zonale (L.) Aiton. Effects de l’âge et de la température. Biol Plant 23, 28–35 (1981). https://doi.org/10.1007/BF02909207

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  • DOI: https://doi.org/10.1007/BF02909207

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