ROS control of polar-growth in plant cells

MANGANO S., S.P. DENITA JUAREZ & J.M. ESTEVEZ.

PLANT PHYSIOLOGY.

AMER SOC PLANT BIOLOGISTS

Lugar: Rockville; Año: 2016

0032-0889

Roothair cells and pollen tubes, like fungal hyphae, possess a typical tip or polar-cellexpansion with growth limited to the apical dome. Cell expansion needs to becarefully regulated to produce a correct shape and size. Polar-cell growth issustained by oscillatory feedback loops comprising three main components thattogether play an important role regulating this process. One of the maincomponents are Reactive Oxygen Species (ROS) that together with calciumions (Ca2+) and pH, sustain polar-growthover time. Apoplastic ROS (apoROS)homeostasis controlled by NADPH oxidases (NOX) as well as by secreted type-IIIPeroxidases (apoPERIII)has a great impact on cell wall properties during cell expansion. Polar-growthneeds to balance a focused secretion of new materials in an extending but stillrigid cell wall in order to contain turgor pressure. Inthis review we discuss the gaps in our understanding of how ROS impact on theoscillatory Ca2+ and pH signatures that,coordinately, allow these two cell types to expand in a controlled manner to severalhundred times their original size toward specific signals.