Auxin as part of the wounding response in plants

CASALONGUE CA, FIOL DF, PARIS R, GODOY AV, DIPPOLITO S, TERRILE MC

Phytohormones and Abiotic Stress Tolerance in Plants

Springer-Verlag

Lugar: Berlin; Año: 2014; p. 115 - 124

Abstract In plants, different types of injury and physical damage are commonlyreferred as wounding. Some organs such as leaves and shoots have cutin as aprotective barrier, but once a wound occurs, putative pathogens may gain entranceinto the plant through the injured tissue. Consequently, plants have developedorchestrated responses to wounding at the histological, genetic, and biochemicallevels resulting in a complex defense mechanism. Therefore, the response towounding is aimed at restoring the physiological status of the damaged tissue andis critical to prevent further lesions.Interestingly, the classical growth regulator auxin has been implicated in thewounding response. Even though initial reports showed an apparent antagonismbetween auxin and wounding, novel findings suggest a more intricate relationshipbetween auxin, stress, and other plant defense pathways. Transcriptomic studiescarried out in Arabidopsis and solanaceous have offered a wider comprehensivepicture on the regulation of auxin-related genes by wounding.In this chapter, we reviewed the participation of auxin-related genes as part ofthe complex mechanism that takes place during wounding in plants particularly inArabidopsis thaliana and solanaceous. In addition, we also raised a discussion,about the participation of small molecules downstream wound signal such as NO,ROS, and eATP.