They Can Handle the Stress: MPK17 and PMD1 act in a salt-specific pathway

摘要

Arabidopsis MAP KINASE17 (MPK17) was recently identified as a novel regulator of peroxisome division inresponse to salt stress. Further, the known peroxisome division factor PEROXISOME AND MITOCHONDRIALDIVISION FACTOR1 (PMD1) genetically acts downstream of MPK17. We previously showed that mutantsdefective in either MPK17 or PMD1 fail to proliferate peroxisomes in response to NaCl stress. Here, weshow that, unlike their abnormal NaCl responses, mpk17 and pmd1 mutants display wild type responses toother stresses known to alter peroxisome proliferation, suggesting that plants distinguish amongperoxisome division-inducing stresses and alter the peroxisome division pathway based on the stressapplied.