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Fungal diversity in adult date palm (Phoenix dactylifera L.) revealed by culture-dependent and culture-independent approaches

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Abstract

Endophytic flora plays a vital role in the colonization and survival of host plants, especially in harsh environments, such as arid regions. This flora may, however, contain pathogenic species responsible for various troublesome host diseases. The present study is aimed at investigating the diversity of both cultivable and non-cultivable endophytic fungal floras in the internal tissues (roots and leaves) of Tunisian date palm trees (Phoenix dactylifera). Accordingly, 13 isolates from both root and leaf samples, exhibiting distinct colony morphology, were selected from potato dextrose agar (PDA) medium and identified by a sequence match search wherein their 18S–28S internal transcribed spacer (ITS) sequences were compared to those available in public databases. These findings revealed that the cultivable root and leaf isolates fell into two groups, namely Nectriaceae and Pleosporaceae. Additionally, total DNA from palm roots and leaves was further extracted and ITS fragments were amplified. Restriction fragment length polymorphism (RFLP) analysis of the ITS from 200 fungal clones (leaves: 100; roots: 100) using HaeIII restriction enzyme revealed 13 distinct patterns that were further sequenced and led to the identification of Alternaria, Cladosporium, Davidiella (Cladosporium teleomorph), Pythium, Curvularia, and uncharacterized fungal endophytes. Both approaches confirmed that while the roots were predominantly colonized by Fusaria (members of the Nectriaceae family), the leaves were essentially colonized by Alternaria (members of the Pleosporaceae family). Overall, the findings of the present study constitute, to the authors’ knowledge, the first extensive report on the diversity of endophytic fungal flora associated with date palm trees (P. dactylifera).

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Authors and Affiliations

  1. Laboratoire de Biotechnologies Végétales Appliquées à l’Améli oration des Cultures LBVAAC, Faculté des Sciences de Sfax, B.P. 1171, 3000, Sfax, Tunisia

    Ines Ben Chobba, Amine Elleuch, Lamia Khannous, Noureddine Drira & Néji Gharsallah

  2. Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, Route Sidi Mansour, B.P. 1177, 3018, Sfax, Tunisia

    Imen Ayadi

  3. Laboratoire de Phytopathologie Oasienne, Centre Régional de Recherches en Agriculture Oasienne à Degache, Degache, 2260, Tunisia

    Ahmed Namsi

  4. Plateforme Séquençage-Génotypage SFR “Montpellier Environnement Biodiversité”, ISEM, Université de Montpellier 2, 34095, Montpellier, France

    Frederique Cerqueira

  5. UMR 5119, Université de Montpellier 2, Sciences et Techniques, pl E. Bataillon, CC093, 34095, Montpellier, France

    Tatiana Vallaeys

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  1. Ines Ben Chobba
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  2. Amine Elleuch
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  7. Noureddine Drira
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  8. Néji Gharsallah
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  9. Tatiana Vallaeys
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Correspondence to Ines Ben Chobba.

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Project supported by EGIDE (No. 18470SA), CMCU (No. 08G908), and the Tunisian Ministry of Higher Education

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Ben Chobba, I., Elleuch, A., Ayadi, I. et al. Fungal diversity in adult date palm (Phoenix dactylifera L.) revealed by culture-dependent and culture-independent approaches. J. Zhejiang Univ. Sci. B 14, 1084–1099 (2013). https://doi.org/10.1631/jzus.B1200300

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