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Phosphorus deficiency increases nodule phytase activity of faba bean–rhizobia symbiosis

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Abstract

The effect of phosphorus deficiency on growth, nodulation and phytase activity was studied in glasshouse for four symbioses involving two faba bean cultivars, namely Aguadulce (AG) and Alfia (AL), and two local rhizobial isolates, namely RhF1 and RhF2. The P deficiency was applied by adding 25 µmol of Pi plant−1 week−1 to nutrient solution, whereas the sufficient control received 125 µmol plant−1 week−1. At flowering stage, the plants were harvested for assessment of growth and nodulation, P and N contents in organs as well as activities of phytase and phosphatases in nodules. The latter were highly stimulated by P deficiency, particularly for AL–RhF1 symbiosis for which shoot growth and P content were not affected by P deficiency. Using in situ RT-PCR, the expression of a plant histidine acid phytase HAP gene was detected in the nodule cortex under P deficiency. It is concluded that high nodule phytase activity constitutes a mechanism for faba bean plants to adapt their nitrogen fixation to P deficiency.

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Abbreviations

AG:

Aguadulce

AL:

Alfia

APase:

Acid phosphatase

DEPC:

Diethyl pyrocarbonate

EURS:

Efficiency in use of rhizobial symbiosis

NDW:

Nodule dry weight

PBS:

Phosphate-buffering saline

pNPP:

para-Nitrophenyl phosphate

PUE:

Phosphorus use efficiency

SDW:

Shoot dry weight

SNF:

Symbiotic nitrogen fixation

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Acknowledgements

This work was supported by the Great Federative FABATROPIMED Project under the reference ID 1001-009 and the AVERROES scholarship programme of the EU for the internship of Bouchra MAKOUDI in Montpellier. We also thank the Moroccan Centre National pour la Recherche Scientifique et Technique (CNRST) for their ministerial fellowship (2011–2015).

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Correspondence to Cherki Ghoulam.

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Communicated by M. H. Walter.

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Makoudi, B., Kabbadj, A., Mouradi, M. et al. Phosphorus deficiency increases nodule phytase activity of faba bean–rhizobia symbiosis. Acta Physiol Plant 40, 63 (2018). https://doi.org/10.1007/s11738-018-2619-6

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  • DOI: https://doi.org/10.1007/s11738-018-2619-6

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