Aluminium detoxification in facultative (Passovia ovata (Pohl ex DC.) Kuijt and Struthanthus polyanthus Mart. - Loranthaceae) and dependent (Psittacanthus robustus (Mart.) Marloth - Loranthaceae) Al-accumulating mistletoe species from the Brazilian savanna

Marcelo Claro de Souza, Marina Corrêa Scalon, Charlotte Poschenrieder, Roser Tolrà, Tiago Venâncio, Simone Pádua Teixeira, Fernando Batista Da Costa

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

© 2018 Elsevier Ltd Mechanisms to detoxify aluminium (Al) is a hot topic for cultivated plants. However, little information is known about the mechanisms used by native plants to deal with Al-toxicity. In Cerrado, some generalist mistletoe species, such as Passovia ovata (Pohl ex DC.) Kuijt and Struthanthus polyanthus Mart. can parasitize Al-accumulating and Al-excluding plant species without any clear symptoms of toxicity and mineral deficiency, while Psittacanthus robustus (Mart.) Marloth, a more specialist mistletoe, seems to be an Al-dependent species, parasitizing only Al-accumulating hosts. Here we (i) characterized the forms and compartmentalization of Al in leaves of P. robustus; (ii) compared Ca and Al leaf concentration, and leaf concentration of organic acids and polyphenols between facultative Al-accumulating (P. ovata and S. polyanthus) and Al-dependent (P. robustus) mistletoe species infecting Miconia albicans (Sw.) Steud. (Al-accumulating species). P. robustus chelated Al3+ with oxalate and stored it in the phloematic and epidermic leaf tissues. Leaf Ca and Al concentration did not differ among species. Leaf oxalate concentration was higher in the Al-dependent species. Concentrations of citrate and phenolic compounds were higher in the leaves of the facultative Al-accumulating species. These results show that facultative Al-accumulating and Al-dependent species use different mechanisms to detoxify Al. Moreover, this is the first report on a mistletoes species (P. robustus) with a potential calcifuge behaviour in Cerrado.
Original languageEnglish
Pages (from-to)58-63
JournalPhytochemistry
Volume153
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Aluminium tolerance
  • Cerrado
  • Hemiparasites
  • Loranthaceae
  • Organic acids
  • Passovia ovata
  • Phenolic compounds
  • Psittacanthus robustus
  • Struthanthus polyanthus

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