Interactions between hormone and redox signalling pathways in the control of growth and cross tolerance to stress

BARTOLI CARLOS GUILLERMO; CASALONGUÉ, CLAUDIA; SIMONTACCHI MARCELA; MARQUEZ-GARCÍA, BELÉN; FOYER, CHRISTINE H

ENVIRONMENTAL AND EXPERIMENTAL BOTANY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2013 vol. 94 p. 73 - 88

0098-8472

The ability of plants to respond to a wide range of environmental stresses is highly flexible and finelybalanced through the interaction of hormonal plant growth regulators and the redox signalling hub,which integrates information from the environment and cellular metabolism/physiology. Plant hormonesproduce reactive oxygen species (ROS) as second messengers in signalling cascades that convey informationconcerning changes in hormone concentrations and/or sensitivity to mediate a whole range ofadaptive responses. Cellular redox buffering capacity that is determined largely by the abundance ofascorbate has a profound influence on the threshold at which hormone signalling is triggered and onthe interactions between different hormones. Other antioxidants such as glutathione, glutaredoxins andthioredoxins are also central redox regulators of hormone signalling pathways. The complex network ofcross-communication between oxidants and antioxidants in the redox signalling hub and the differenthormone signalling pathways maximises productivity under stress-free situations and regulates plantgrowth, development, reproduction, programmed cell death and survival upon exposure to stress. Thisinteractive network confers enormous regulatory potential because it allows plants to adapt to changingand often challenging conditions, while preventing boom or bust scenarios with regard to resources,ensuring that energy is produced and utilised in a safe and efficient manner.