期刊
PLANT JOURNAL
卷 91, 期 6, 页码 1029-1037出版社
WILEY
DOI: 10.1111/tpj.13624
关键词
variation potential; slow wave potential; systemic signalling; electrical signals; wounding; Arabidopsis; wheat; xylem flow; hydraulic waves
资金
- Biotechnology and Biological Sciences Research Council (BBSRC) Institute Strategic Programme [BB/J004553/1]
- BBSRC NRP DTP
- Biotechnology and Biological Sciences Research Council [1243385, BBS/E/J/000PR9796, BBS/E/J/000C0641] Funding Source: researchfish
- BBSRC [BBS/E/J/000PR9796] Funding Source: UKRI
Long-distance signalling is important for coordinating plant responses to the environment. Variation potentials (VPs) are a type of long-distance electrical signal that are generated in plants in response to wounding or flaming. Unlike self-propagating action potentials, VPs can be measured beyond regions of dead or chemically treated tissue that block signal generation, suggesting a different mode of propagation. Two alternative propagation mechanisms have been proposed: movement of a chemical agent and a pressure wave through the vasculature. Variants of these two signalling mechanisms have been suggested. Here, we use simple models of the underlying physical processes to evaluate and compare these predictions against independent data. Our models suggest that chemical diffusion and pressure waves are unlikely to capture existing data with parameters that are known from other sources. The previously discarded hypothesis of mass flow in the xylem transporting a chemical agent, however, is able to reproduce experimental propagation speeds for VPs. We therefore suggest that chemical agents transported by mass flow within the xylem are more likely than a pressure wave or chemical diffusion as a VP propagation mechanism. Understanding this mode of long-distance signalling within plants is important for unravelling how plants coordinate physiological responses via cell-to-cell communication.
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