Abutilon theophrasti´s Defense Against The Allelochemical Benzoxazolin-2(3H)-One: Support by Actinomucor Elegans

Vincenzo Tabaglio, Adriano Marocco, Sevda Haghi Kia, Margot Schulz, Emmanuel Ayah, Alexander Schouten, Carmen Müllenborn, Christian Paetz, Bernd Schneider, Diana Hofmann, Ulrich Disko

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

7 Citazioni (Scopus)

Abstract

Abutilon theophrasti Medik., previously found to be rather insensitive to benzoxazinoid containing rye mulch and the allelochemical benzoxazolin-2(3H)-one (BOA), can be associated with the zygomycete Actinomucor elegans, whereby the fungus colonizes the root relatively superficially and mainly in the maturation zone. The fungus mitigates necrosis of the cotyledons when seedlings are incubated with 2 mMBOA, in contrast to those that lack the fungus. In liquid cultures of the fungus, tryptophan was identified. The accumulation of tryptophan is increased in presence of BOA. This amino acid seems to be important in protecting Abutilon against BOA and its derivatives since it suppressed the accumulation of BOA derived, highly toxic 2-aminophen-oxazin- 3-one (APO) in the medium and on the root surface during BOA incubations of Abutilon seedlings. Although A. elegans is insensitive to BOA and APO, the fungus is not able to protect the plant against harmful effects of APO, when seedlings are treated with the compound. Abutilon can detoxify BOA via BOA-6-OH glucosylation probably by a cell wall associated glucosyltransferase, but only low amounts of the product accumulate. Low tryptophan concentrations can contribute to a degradation of the toxic intermediate BOA-6-OH by Fenton reactions, whereby the amino acid is oxidized. One of the oxidation products was identified as 4(1H)-quinolinone, which is the core substructure of the quorum sensing molecule 2-heptyl-3-hydroxy-4-quinolone. The mutualistic association of Abutilon theophrasti with Actinomucor elegans is considered as opportunistic and facultative. Such plant-fungus associations depend rather likely on environmental conditions,such as the mode of fertilization.
Lingua originaleEnglish
pagine (da-a)1286-1298
Numero di pagine13
RivistaJournal of Chemical Ecology
Volume40
DOI
Stato di pubblicazionePubblicato - 2014

Keywords

  • 2-Aminophen-oxazin-3-one
  • Abutilon theophrasti Medik
  • Actinomucor elegans
  • Benzoxazolin-2(3H)-one
  • Detoxification
  • Plant-microbial interactions
  • Tryptophan
  • Weeds

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