The role of P-type IIA and P-type IIB Ca2+-ATPases in plant development and growth

KUMAR, KRISHNA; RONDÓN GUERRERO, YOSSMAYER DEL CARMEN; MUSCHIETTI, JORGE P; BOSSI, JULIÁN GARCÍA; DOMÍNGUEZ, GABRIELA DÍAZ; OBERTELLO, MARIANA; BARBERINI, MARÍA LAURA; MARINO-BUSLJE, CRISTINA; ESTEVEZ, JOSÉ M

JOURNAL OF EXPERIMENTAL BOTANY

OXFORD UNIV PRESS

Año: 2019 vol. 71 p. 1239 - 1248

0022-0957

As sessile organisms, plants have evolved mechanisms to adapt to variable and rapidly fluctuating environmental conditions. Calcium (Ca2+) in plant cells is a versatile intracellular second messenger essential for mounting short- and long-term responses to environmental stresses through changes in cytosolic Ca2+ concentrations ([Ca2+]cyt). The increase in [Ca2+]cyt directs the strength and length of these stimuli. In order to terminate them, the cells must then remove the [Ca2+]cyt against a concentration gradient, away from the cell, or store it in organelles (ER or/and vacuoles). In this review, we summarize the current knowledge about the biological roles of plant P-type Ca2+-ATPases, which include the P-type IIA ECAs (for ER-type Ca2+-ATPases) and the P-type IIB ACAs (Autoinhibited Ca2+-ATPases) as potential actors in the regulation of this cytosolic Ca2+ eflux. While ECAs are analogous proteins to SERCA (animal sarcoplasmic-endoplasmic reticulum Ca2+-ATPase), ACAs are equivalent to PMCA (animal plasma membrane PM-type ATPases). We analyze their expression pattern in polar growth cells and study their appearance during the evolution of the plant lineage. Details on the functions and coordination of the ECAs and ACAs during plant growth and development have not yet been elucidated. Our current understanding of the regulation of Ca2+ gradient fluctuations in the cytoplasm and organelles during growth is in its infancy, but recent technological advances in Ca2+ imaging are expected to shed light on this field.