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Changes in organic compounds secreted by roots in two Poaceae species (Hordeum vulgare and Polypogon monspenliensis) subjected to iron deficiency

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Abstract

Despite their economic and ecological interests, Poaceae are affected by the low availability of iron in calcareous soils. Several studies focused on the capacity of this family to secrete phytosiderophores and organic acids as a mechanism of tolerance to iron deficiency. This work aimed at studying the physiological responses of two Poaceae species; Hordeum vulgare (cultivated barley) and Polypogon monspenliensis (spontaneous species) to iron deficiency, and evaluate especially the release of phytosiderophores and organic acids. For this purpose, seedlings of these two species were cultivated in complete nutrient solution with or without iron. The biomass production, iron status, phytosiderophores and organic acids release by roots were studied. The results demonstrated that Polypogon monspenliensis was relatively more tolerant to iron deficiency than Hordeum vulgare. Polypogon monspenliensis had the ability to secrete a higher amount of phytosiderophores and organic acids, especially citric, acetic, oxalic and malic acids, compared to Hordeum vulgare. We propose this spontaneous species as a forage plant in calcareous soils and in intercropping systems with fruit trees to prevent iron chlorosis.

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Abbreviations

H.v :

Hordeum vulgare

OA:

Organic acid

P.m :

Polypogon monspenliensis

PS:

Phytosiderophore

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Acknowledgements

This work was supported by grants from the Tunisian Ministry of Higher Education, Scientific Research (LR10CBBC02).

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  1. Dorsaf Nakib and Tarek Slatni have contributed equally to this work as first authors.

Authors and Affiliations

  1. Laboratoire Des Plantes Extrêmophiles (LPE), Centre de Biotechnologie de Borj Cedria (CBBC), BP 901, 2050, Hammam Lif, Tunisie

    Dorsaf Nakib, Tarek Slatni & Chedly Abdelly

  2. Department of Agricultural and Food Science, University of Bologne, Viale Fanin 44, 40127, Bologne, Italy

    Dorsaf Nakib

  3. Faculté Des Sciences de Tunis (FST), Département de Biologie, Université de Tunis El Manar (UTM), 1060, Tunis, Tunisie

    Tarek Slatni

  4. Faculté Des Sciences de Bizerte (FSB), Département de Biologie, Université de Carthage (UCAR), Avenue de la République, BP 77-1054, Amilcar, Tunisie

    Dorsaf Nakib, Michele Di Foggia & Adamo Domenico Rombolà

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  1. Dorsaf Nakib
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Nakib, D., Slatni, T., Di Foggia, M. et al. Changes in organic compounds secreted by roots in two Poaceae species (Hordeum vulgare and Polypogon monspenliensis) subjected to iron deficiency. J Plant Res 134, 151–163 (2021). https://doi.org/10.1007/s10265-020-01237-5

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