| Autor: |
Schulz, Margot, Sicker, Dieter, Schackow, Oliver, Hennig, Lothar, Yurkov, Andrey, Siebers, Meike, Hofmann, Diana, Disko, Ulrich, Ganimede, Cristina, Mondani, Letizia, Tabaglio, Vincenzo, Marocco, Adriano |
| Zdroj: |
Plant Signaling & Behavior; August 2017, Vol. 12 Issue: 8 |
| Abstrakt: |
ABSTRACTA facultative, microbial micro-community colonizing roots of Abutilon theophrastiMedik. supports the plant in detoxifying hydroxylated benzoxazolinones. The root micro-community is composed of several fungi and bacteria with Actinomucor elegansas a dominant species. The yeast Papiliotrema baiiand the bacterium Pantoea ananatisare actively involved in the detoxification of hydroxylated benzoxazolinones by generating H2O2. At the root surface, laccases, peroxidases and polyphenol oxidases cooperate for initiating polymerization reactions, whereby enzyme combinations seem to differ depending on the hydroxylation position of BOA-OHs. A glucosyltransferase, able to glucosylate the natural benzoxazolinone detoxification intermediates BOA-5- and BOA-6-OH, is thought to reduce oxidative overshoots by damping BOA-OH induced H2O2generation. Due to this detoxification network, growth of Abutilon theophrastiseedlings is not suppressed by BOA-OHs. Polymer coats have no negative influence. Alternatively, quickly degradable 6-hydroxy-5-nitrobenzo[d]oxazol-2(3H)-one can be produced by the micro-community member Pantoea ananatisat the root surfaces. The results indicate that Abutilon theophrastihas evolved an efficient strategy by recruiting soil microorganisms with special abilities for different detoxification reactions which are variable and may be triggered by the allelochemical´s structure and by environmental conditions. |
| Databáze: |
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