Association and mycorrhizal dependency in Jatropha curcas L. seedlings under salt stress
Palavras-chave:
arbuscular mycorrhizal fungi, symbiosis, salinity, physic nut.Resumo
The cultivation of Jatropha curcas L. for biodiesel production is possible in salinized areas; however, biomass
production is limited in these soils. Arbuscular mycorrhizal fungi (AMF) are a promising alternative for bioremediation
in salinized soils. Yet, salinity also affects the AMF at the time of colonization and, in this case, the symbiosis is not
always established. Therefore, the aim of this study was to test the hypotheses that three AMF species commonly
found in saline soils are associated with J. curcas and if seedlings previously inoculated with these AMF are more
tolerant to salt stress. Two trials were performed: the first one was carried out in a completely randomized design with
five treatments (control, Rhizophagus intraradices, Gigaspora albida, Claroideoglomus etunicatum, and the three
species together) and six repetitions to investigate the formation of symbiosis among species; and the second trial was
carried out in randomized blocks in a 4 × 2 factorial scheme (2, 5, 8, and 10 dS m-1, with and without mycorrhizae) with
eight repetitions to verify the development and mycorrhizal dependency (MD) of the seedlings previously inoculated,
in salinized environment. The three species of AMF are associated with J. curcas both alone and together. Mycorrhizal
dependency increased with salinity, indicating that J. curcas is a facultative species. The pre-colonized seedlings with
AMF are an alternative to the establishment of J. curcas in salinized soils.
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