| Popis: |
Hydrogen peroxide (H2O2) is a natural side-product of several redox pathways, including photorespiration, photosynthesis, and respiration. Thus, the potential role played by that molecule in retrograde signaling events has been studied for many years. Several studies involving the increase of H2O2 concentrations due to exogenous supply and genetic transformation have evidenced the occurrence of cross tolerance to a subsequent abiotic stress exposition. Indeed, H2O2 involvement in signaling to induce priming is very important for plant memory and stress tolerance. However, an integrative view of H2O2 signaling in plant cells and the mechanisms related to plant endurance are still challenging to date. The limitation of accurate techniques for cellular H2O2 quantification is probably the greatest obstacle for the comprehension of its roles in signaling for protective responses. In this chapter, the molecular, biochemical, and physiological mechanisms related to H2O2-induced cross-tolerance for abiotic and biotic stresses are comprehensively and deeply discussed. |
