| Literature DB >> 29605100 |
Silvina Mangano1, Javier Martínez Pacheco2, Cristina Marino-Buslje3, José M Estevez4.
Abstract
Polar growth in root hairs and pollen tubes is an excellent model for investigating plant cell size regulation. While linear plant growth is historically explained by the acid growth theory, which considers that auxin triggers apoplastic acidification by activating plasma membrane P-type H+-ATPases (AHAs) along with cell wall relaxation over long periods, the apoplastic pH (apopH) regulatory mechanisms are unknown for polar growth. Polar growth is a fast process mediated by rapid oscillations that repeat every ∼20-40s. In this review, we explore a reactive oxygen species (ROS)-dependent mechanism that could generate oscillating apopH gradients in a coordinated manner with growth and Ca2+ oscillations. We propose possible mechanisms by which apopH oscillations are coordinated with polar growth together with ROS and Ca2+ waves.Entities:
Keywords: Arabidopsis thaliana; Ca(2+); P-type H(+)-ATPase; apoplastic pH; polar cell expansion; reactive oxygen species
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Year: 2018 PMID： 29605100 DOI： 10.1016/j.tplants.2018.02.008
Source DB: PubMed Journal: Trends Plant Sci ISSN： 1360-1385 Impact factor: 18.313