Effect of phosphorus deficiency on acid phosphatase and phytase activities in common bean (Phaseolus vulgaris L.) under symbiotic nitrogen fixation |
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Authors: | Saber Kouas Julien Louche Ahmed Debez Claude Plassard Jean Jacques Drevon Chedly Abdelly |
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Institution: | (1) Laboratoire d’Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie, BP 901, 2050 Hammam-Lif, Tunisia;(2) Rhizosphere et Symbiose, Institut National de la Recherche Agronomique (UMR 1220), 1, Place Viala, 34060 Montpellier, France; |
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Abstract: | Changes in growth, symbiotic nitrogen fixation (SNF), acid phosphatase (ACP), and phytase activities to phosphorus availability
(15 and 60 μmol KH2PO4 plant−1 week−1) were compared in two recombinant lines (115 and 147) of common bean. Plant growth, nodulation and SNF were genotype and
P level-dependent. 147 was more affected by P shortage (15 μmol P) than 115. Four ACP types were revealed in the nodules of
both lines, ACP1 exhibiting a higher specific activity under P shortage as compared to the 60 μmol P treatment, especially
in 115. A single phytase was revealed for the nodules of both lines and was significantly enhanced by P deficiency. Three
ACP types were found in roots and leaves, showing increasing activity under P deficiency, especially in 115. Regardless of
P supply, leaf ACP specific activity was higher than that of nodules and roots in the both lines. Interestingly, phosphorus
use efficiency for N2 fixation significantly correlated to nodule ACP activity under P shortage in the both lines. The relatively better performance
of 115 as compared to 147 under P deficiency could be partly ascribed to the ability of 115 to maintain higher ACP activity.
This enzyme might be involved in the remobilization of the plant Pi and its utilization for SNF. |
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