Auxin and Stress Acclimation in Plants

RAMIRO PARÍS, MARÍA J. IGLESIAS, ANDREA Y. MANSILLA, DIEGO F FIOL, MARÍA C TERRILE, CARMEN I. SEGARRA AND CLAUDIA A CASALONGUÉ

Auxin: Structure, Biosynthesis and Functions.

Nova Science Publishers

Año: 2012;

Persistent salinization of arable lands is getting widespread, decreasing concomitant the yield of formerly productive soils around the globe. Delayed germination, high rate of seedling mortality, and reduced yield are some of the most common effects of salted soils. On the other hand, the phythormone auxin plays a role in organogenesis, vascular tissue differentiation and root development in plants. In addition, auxin also takes part during the adaptive plant response against adverse environmental conditions.In this work, we demonstrated that the interference of the auxin-signaling pathway through genetic mutation of TIR1/AFB family members increased tolerance under salinity, measured as a higher germination rate in Arabidopsis thaliana. Additionally, we demonstrated that a germin-like protein, known as up-regulated by auxin, is also regulated as consequence of NaCl-mediated stress in wheat leaves.As a conclusion, we suggest that the regulation of different auxin-related proteins may be a general mechanism by which plants reprogram developmental processes overcoming adverse environmental conditions. Furthermore, these findings might help in defining strategies to generate engineered plants in order to enhance the productivity in salted soils.