Root Proliferation,Proton Efflux,and Acid Phosphatase Activity in Common Bean (<Emphasis Type="Italic">Phaseolus vulgaris</Emphasis>) Under Phosphorus Shortage |
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Authors: | Saber Kouas Ahmed Debez Tarek Slatni Nahla Labidi 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: | The impact of phosphorus (P) availability on root proliferation, proton efflux, and acid phosphatase activities in roots and
leaves was investigated in two lines of common bean (Phaseolus vulgaris): BAT 477 and CocoT. Phosphorus was supplied as KH2PO4 at 0 and 60 μmol per plant (0P and 60P, respectively). Under P shortage, the plant growth was more restricted in CocoT than
in BAT 477, shoots being more affected than roots. The root area increased significantly at 0P in both lines. Up to 1 week
following P shortage, the proton efflux increased in both lines despite a higher extent in BAT 477 as compared to CocoT. Root
acid phosphatase activity was significantly higher under P limitation in the both lines, this trend being more pronounced
in BAT 477 than in CocoT. This was also true for the leaf acid phosphatase. Regardless of the bean line, higher values were
recorded for the old leaves as compared to the young ones for this parameter. Interestingly, a significant correlation between
Pi content in old leaves and their acid phosphatase activity was found in P-lacking (0P) plants of the both bean lines, suggesting
that acid phosphatase may contribute to increase the phosphorus use efficiency in bean through the P remobilization from the
old leaves. As a whole, our results highlight the significance of the root H+ extrusion and the acid phosphatase activity rather than the root proliferation in the relative tolerance of BAT 477 to severe
P deficiency. |
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