Chitosan stimulates root hair callose deposition and inhibits root hair growth

作者：Matěj Drs, Samuel Haluška, Eliška Škrabálková, Pavel Krupař, Andrea Potocká, Lucie Brejšková, Karel Müller, Natalia Serrano, Aline Voxeur, Samantha Vernhettes, Jitka Ortmannová, George Alexandru Caldarescu, Matyáš Fendrych, Martin Potocký, Viktor Žárský, Tamara Pečenková · 发表于：bioRxiv (Cold Spring Harbor Laboratory) · 年份：2023 · DOI：10.1101/2023.07.30.551171 · 被引用次数：1 · 研究领域：Legume Nitrogen Fixing Symbiosis、Plant-Microbe Interactions and Immunity、Polysaccharides and Plant Cell Walls

Abstract Although angiosperm plants have a general capacity to react after the immunity elicitor chitin or chitosan treatment by the cell wall callose deposition, this response in particular cell types and its evolutionary conservation is not understood. Here we show that also the growing root hairs (RHs) of Arabidopsis can respond to a mild (0.001%) chitosan treatment by the callose deposition and by a deceleration of the RH growth. We demonstrate that the glucan synthase-like 5 (GSL5)/PMR4 is vital for chitosan-induced callose deposition but not for RH growth inhibition. Upon the higher chitosan concentration (0.01%) treatment, RHs do not deposit callose, while growth inhibition is prominent. To understand the specificities of the low and high concentration chitosan treatments, we analysed the corresponding PTI signalling components, gene expression, and RH cellular endomembrane and cytoskeleton modifications. Importantly, chitosan-induced callose deposition is also present in the functionally analogous and evolutionarily only distantly related RH-like structures rhizophores (lycophytes) and rhizoids (bryophytes). Our results point to the RH callose deposition as a conserved strategy of soil-anchoring plant cells (rhizoids/rhizophores/RHs) to deal with mild biotic stress. At the same time, high chitosan concentration prominently disturbs intracellular dynamics, tip-localised endomembrane compartments and RH growth, precluding callose deposition.