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dc.contributor.authorYoung, Phoebe
dc.contributor.authorPierce, Brandon Daniel
dc.contributor.authorKitson-Finuff, Jamie
dc.contributor.authorJain, Purvi
dc.contributor.authorSchneider, Karl
dc.contributor.authorLazar, Stephen
dc.contributor.authorTaran, Olga
dc.contributor.authorPalmer, Andrew G.
dc.contributor.authorLynn, David G.
dc.contributor.authorFuller, Alexandra W.
dc.identifier.citationFuller, A.W., Young, P., Pierce, B.D., Kitson-Finuff, J., Jain, P., Schneider, K., Lazar, S., Taran, O., Palmer, A.G., Lynn, D.G. Redox-mediated quorum sensing in plants (2017) PLoS ONE, 12 (9), art. no. e0182655, .en_US
dc.descriptionquinone/hydroquinone redox cycle, soil, critical developmental checkpointsen_US
dc.description.abstractThe rhizosphere, the narrow zone of soil around plant roots, is a complex network of interactions between plants, bacteria, and a variety of other organisms. The absolute dependence on host-derived signals, or xenognosins, to regulate critical developmental checkpoints for host commitment in the obligate parasitic plants provides a window into the rhizosphere’s chemical dynamics. These sessile intruders use H2O2 in a process known as semagenesis to chemically modify the mature root surfaces of proximal host plants and generate p-benzo-quinones (BQs). The resulting redox-active signaling network regulates the spatial and temporal commitments necessary for host attachment. Recent evidence from non-parasites, including Arabidopsis thaliana, establishes that reactive oxygen species (ROS) production regulates similar redox circuits related to root recognition, broadening xenognosins’ role beyond the parasites. Here we compare responses to the xenognosin dimethoxybenzoqui-none (DMBQ) between the parasitic plant Striga asiatica and the non-parasitic A. thaliana. Exposure to DMBQ simulates the proximity of a mature root surface, stimulating an increase in cytoplasmic Ca2+ concentration in both plants, but leads to remarkably different phenotypic responses in the parasite and non-parasite. In S. asiatica, DMBQ induces development of the host attachment organ, the haustorium, and decreases ROS production at the root tip, while in A. thaliana, ROS production increases and further growth of the root tip is arrested. Obstruction of Ca2+ channels and the addition of antioxidants both lead to a decrease in the DMBQ response in both parasitic and non-parasitic plants. These results are consistent with Ca2+ regulating the activity of NADPH oxidases, which in turn sustain the autocatalytic production of ROS via an external quinone/hydroquinone redox cycle. Mechanistically, this chemistry is similar to black and white photography with the emerging dynamic reaction-diffusion network laying the foundation for the precise temporal and spatial control underlying rhizosphere architecture. Copyright: © 2017 Fuller et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en_US
dc.description.sponsorshipPublication of this article was funded in part by the Open Access Subvention Fund and the Florida Tech Libraries.
dc.rights© 2017 the Authors. Licensed under Creative Commons Attribution Licenseen_US
dc.titleRedox-mediated quorum sensing in plantsen_US

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© 2017 the Authors.  Licensed under Creative Commons Attribution License
Except where otherwise noted, this item's license is described as © 2017 the Authors. Licensed under Creative Commons Attribution License