Original Paper

Mycorrhiza

, Volume 16, Issue 8, pp 559-565

The ectomycorrhizal fungus Scleroderma bermudense alleviates salt stress in seagrape (Coccoloba uvifera L.) seedlings

  • E. BandouAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la GuyaneLaboratoire de mycologie-flore pathogène du sol, Unité de recherches en productions végétales, Domaine de Duclos
  • , F. LebaillyAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la Guyane
  • , F. MullerAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la Guyane
  • , M. DulormneAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la Guyane
  • , A. ToribioAffiliated withLaboratoire de mycologie-flore pathogène du sol, Unité de recherches en productions végétales, Domaine de Duclos
  • , J. ChabrolAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la Guyane
  • , R. CourtecuisseAffiliated withDépartement de botanique, Faculté des sciences pharmaceutiques et biologiques, Université de Lille
  • , C. PlenchetteAffiliated withINRA, UMR BGA
  • , Y. PrinAffiliated withLaboratoire des symbioses tropicales et méditerranéennes,UMR 113 IRD/INRA/AGRO-M/CIRAD/UM2, TA10/J, Campus international de Baillarguet
    • , R. DuponnoisAffiliated withLaboratoire des symbioses tropicales et méditerranéennes,UMR 113 IRD/INRA/AGRO-M/CIRAD/UM2, TA10/J, Campus international de BaillarguetLaboratoire commun de microbiologie IRD/ISRA/UCAD
    • , M. ThiaoAffiliated withLaboratoire commun de microbiologie IRD/ISRA/UCAD
    • , S. SyllaAffiliated withLaboratoire commun de microbiologie IRD/ISRA/UCAD
    • , B. DreyfusAffiliated withLaboratoire des symbioses tropicales et méditerranéennes,UMR 113 IRD/INRA/AGRO-M/CIRAD/UM2, TA10/J, Campus international de Baillarguet
    • , A. M. BâAffiliated withLaboratoire de biologie et physiologie végétales, Faculté des sciences exactes et naturelles, Université des Antilles et de la GuyaneLaboratoire des symbioses tropicales et méditerranéennes,UMR 113 IRD/INRA/AGRO-M/CIRAD/UM2, TA10/J, Campus international de Baillarguet Email author 

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Abstract

The purpose of this study was to test the capacity of the ectomycorrhizal (ECM) fungus, Scleroderma bermudense, to alleviate saline stress in seagrape (Coccoloba uvifera L.) seedlings. Plants were grown over a range (0, 200, 350 and 500 mM) of NaCl levels for 12 weeks, after 4 weeks of non-saline pre-treatment under greenhouse conditions. Growth and mineral nutrition of the seagrape seedlings were stimulated by S. bermudense regardless of salt stress. Although ECM colonization was reduced with increasing NaCl levels, ECM dependency of seagrape seedlings increased. Tissues of ECM plants had significantly increased concentrations of P and K but lower Na and Cl concentrations than those of non-ECM plants. Higher K concentrations in the leaves of ECM plants suggested a higher osmoregulating capacity of these plants. Moreover, the water status of ECM plants was improved despite their higher evaporative leaf surface. The results suggest that the reduction in Na and Cl uptake together with a concomitant increase in P and K absorption and a higher water status in ECM plants may be important salt-alleviating mechanisms for seagrape seedlings growing in saline soils.

Keywords

Coccoloba uvifera Ectomycorrhizal dependency Mineral uptake Salt stress Water status