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Rhizosphere Acidification Determines Phosphorus Availability in Calcareous Soil and Influences Faba Bean ( Vicia faba ) Tolerance to P Deficiency

Author

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  • Basma Baccari

    (Laboratory of Ecosystems and Biodiversity in Arid Lands, Faculty of Sciences, University of Sfax, Sfax 3000, Tunisia)

  • Abdelmajid Krouma

    (Laboratory of Ecosystems and Biodiversity in Arid Lands, Faculty of Sciences, University of Sfax, Sfax 3000, Tunisia
    Faculty of Sciences and Techniques of Sidi Bouzid, Kairouan University, Kairouan 9100, Tunisia)

Abstract

Calcareous soils are known for their alkaline pH-promoting insoluble forms of certain nutrients, including phosphorus (P). Rhizosphere acidification is one of the main physiological mechanisms of phosphorus mobilization by plants. However, specific and genotypic differences in response to P deficiency are often observed, giving some genotypes particular tolerance abilities. This genetic potential gives us a new opportunity to colonize unused lands, improve yield in problematic soils, and install sustainable agrosystems. To this end, a potted experiment was conducted on three faba bean genotypes (Seville, SEV; Aguadulce, AGUA; and Tunisian, TUN) cultivated on calcareous soil (CS), as compared to fertile soil (FS). Measurements are made on plant growth, the SPAD index, photosynthesis, P distribution, rhizosphere acidification, and related interrelationships. Calcareous soil induced specific symptoms of P deficiency, reduced P concentration and decreased SPAD index, net photosynthesis, and plant growth. Rhizosphere acidification was significantly stimulated in CS. This activity determines the genotypic differences in response to P deficiency in faba bean. The genotype TUN was more adapted to calcareous-induced P deficiency than AGUA and SEV by increasing acidification activity, decreasing pH by 0.6 units in the rhizosphere, and having higher biomass production, photosynthesis, P remobilization, and P accumulation. The key functional traits (plant growth, chlorophyll biosynthesis, and photosynthesis) are strictly dependent on P availability, which remains in close relationship with the acidification capacity (AC). The tolerant genotype (TUN) expressed a lower stress index (SI) but higher P use efficiency (PUE), H-ATPase activity, and P uptake and translocation to shoots (PT), allowing it to maintain better metabolic functioning. AC, PT, PUE, and SI are among the main traits of P management in calcareous soils that promote resilient crops.

Suggested Citation

  • Basma Baccari & Abdelmajid Krouma, 2023. "Rhizosphere Acidification Determines Phosphorus Availability in Calcareous Soil and Influences Faba Bean ( Vicia faba ) Tolerance to P Deficiency," Sustainability, MDPI, vol. 15(7), pages 1-18, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:7:p:6203-:d:1115747
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    References listed on IDEAS

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    1. Dallas S. Batten & Michael T. Belongia, 1984. "The recent decline in agricultural exports: is the exchange rate the culprit?," Review, Federal Reserve Bank of St. Louis, vol. 66(Oct), pages 5-14.
    2. Mutair A. Akanji & Munir Ahmad & Mohammad I. Al-Wabel & Abdullah S. F. Al-Farraj, 2022. "Soil Phosphorus Fractionation and Bio-Availability in a Calcareous Soil as Affected by Conocarpus Waste Biochar and Its Acidified Derivative," Agriculture, MDPI, vol. 12(12), pages 1-35, December.
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    1. Paschalis Papakaloudis & Christos Dordas, 2023. "Phosphorus Fertilization Affects Morphological, Physiological and Agronomic Characteristics of Faba Bean Cultivars," Sustainability, MDPI, vol. 15(17), pages 1-24, September.

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