Abscisic acid (ABA) plays crucial roles in plant growth and development, and also in plant responses to abiotic and biotic stresses. ABA can stimulate the production of reactive oxygen species (ROS) that act as signals in low concentrations, but as cell-damaging agents in high concentrations. A mutation in ABO8, encoding a pentatricopeptide repeat (PPR) protein responsible for the splicing of NAD4 intron 3, leads to hypersensitivity to ABA in root growth, and root tips of the abo8-1 mutants accumulate more ROS than those of the wild type; this accumulation of ROS in abo8-1 root tips is enhanced by ABA treatment. We also found that auxin signaling and/or accumulation is greatly reduced in root tips of the abo8-1 mutants. Addition of the reducing agent GSH to the growth medium partially recovers the root hypersensitivity to ABA, and also the ABA-inhibited expression of PLT1/2 in abo8-1. Furthermore, the inducible expression of PLT2 largely rescues the root growth defect of abo8-1 with and without ABA treatment. Our results reveal the important roles of ROS in regulating root meristem activity in the ABA signaling pathway.
Vyšlo v časopise: ABA-Mediated ROS in Mitochondria Regulate Root Meristem Activity by Controlling Expression in. PLoS Genet 10(12): e32767. doi:10.1371/journal.pgen.1004791 Kategorie: Research Article prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004791
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