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HISTOCHEMISTRY OF K⁺-STIMULATED AND Mg⁺⁺-DEPENDENT PHOSPHATASES IN CORN ROOTS

D. OMOKOLO NDOUMOU, D. DEKEGEL and L. NEIRINCKX
Bulletin de la Société Royale de Botanique de Belgique / Bulletin van de Koninklijke Belgische Botanische Vereniging
T. 119, Fasc. 1 (1986), pp. 101-106
Stable URL: http://www.jstor.org/stable/20794075
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
HISTOCHEMISTRY OF K⁺-STIMULATED AND Mg⁺⁺-DEPENDENT PHOSPHATASES IN CORN ROOTS
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Abstract

Phosphatase activity (demonstrated by the lead trapping method) occurs mainly in the plasmalemma, mitochondria and tonoplast of maize roots (Zea mays L cv Anjou 18) and is Mg⁺⁺ dependent. Besides, the plasmalemma-bound phosphatase is strongly K⁺ dependent, while the phosphatase activity of the inner cell compartments depends less on K⁺. These results are consistent with the presence of at least two different types of phosphatases in maize roots. The possible function of Mg⁺⁺ and K⁺ in the activation of these enzymes is discussed, as well as the implication of the K⁺-dependent phosphatase in the ion uptake. L'activité phosphatasique (démontrée par la méthode de précipitation du complexe PbPi) se situe essentiellement dans les plasmalemmes, les mitochondries et les tonoplastes des racines de maïs et est dépendante de l'ion Mg⁺⁺. En outre, la phosphatase associée aux plasmalemmes est celle fortement dépendante de l'ion K⁺, alors que celle associée aux organelles cellulaires l'est moins, les résultats confirment l'hypothèse selon laquelle il existerait au moins deux types de phosphatases dans les racines de maïs. Le rôle probable du Mg⁺⁺ et du K⁺ dans l'activation de ces enzymes est discuté ainsi que l'implication de la phosphatase K⁺ dépendante dans l'absorption ionique.

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