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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mechanisms of storage and detoxification of Al in two tropical mistletoes

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Souza, Marcelo Claro [1] ; Scalon, Marina Correa [2] ; Poschenrieder, Charlotte [3] ; Tolra, Roser [3] ; Venancio, Tiago [4] ; Teixeira, Simone Padua [1] ; Da Costa, Fernando Batista [1]
Total Authors: 7
[1] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, AsterBioChem Res Team, Ribeirao Preto - Brazil
[2] Univ Oxford, Oxford - England
[3] Autonomous Univ Barcelona, Bellaterra - Spain
[4] Univ Fed Sao Carlos, Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 3

Passovia ovata (Pohl ex DC.) Kuijt and Struthanthus polyanthus Mart. are hemiparasitic mistletoes that can grow on Al-accumulating and Al-excluding woody species in the Brazilian Cerrado. It is unclear to what extent this hemiparasitic lifestyle implies facultative Al accumulation by the mistletoes and if so, what are the Al tolerance mechanisms in these species. Using a field-work experiment composed by two facultative Al-accumulating mistletoe species (P. ovada and S. polyanthus) infecting Al-accumulating (Miconia albicans (Sw.) Steud.) and Al excluding (Byrsonima verbascifolia (L.) DC.) hosts, we (1) investigated Al accumulation and leaf nutritional status of the mistletoes, (2) characterized the storage sites and the forms of Al accumulated in their leaves, and (3) determined differences in levels of simple organic acids associated with Al detoxification. Leaf nutrients and Al accumulation in mistletoes followed the host elements availability. In both mistletoe species infecting the Al accumulating host M. albicans, Al was mainly allocated to the phloem fibres, and Al-citrate was the main form of Al. Contrastingly, in the hosts' leaves Al was present mainly in the form of oxalate complexes. When growing on B. verbascifolia, the Al excluding host, the two mistletoes neither showed symptoms of Al storage nor formation of Al-organic acid complexes. In conclusion, mistletoes growing on Al-accumulating trees tolerate high Al tissue levels by allocating Al in phloem fibres and by its chelation with citrate. (AU)

FAPESP's process: 10/51454-3 - Morphoanatomical, metabolomic and molecular studies as subsidies to the systematic of Asteraceae species and access to their pharmacological potential
Grantee:Beatriz Appezzato da Glória
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/26866-7 - Metabolomics, enzymatic targets and in silico tools in the search of bioactive compounds from plants
Grantee:Fernando Batista da Costa
Support type: Regular Research Grants
FAPESP's process: 13/21293-6 - Progress on metabolomics studies of Cerrado plant species developed in different aluminium availabilities
Grantee:Marcelo Claro de Souza
Support type: Scholarships in Brazil - Post-Doctorate