The growth of Arabidopsis primary root is repressed by several and diverse amino acids through auxin-dependent and independent mechanisms and MPK6 kinase activity.
The results indicate a critical role of the MPK6 kinase in coordinating meristem cell activity to Phosphate (Pi) and iron (Fe) availability for proper primary root growth.
critical role in manipulating plant photosynthetic activities to promote ROS accumulation in chloroplasts and hypersensitive response cell death which contributes to the robustness of effector-triggered immunity
MPK6 was activated by red light and the cotyledon opening angle in red light was reduced in mpk6 seedlings. MKK10 a MAPKK whose function is currently unclear appears to act as a kinase upstream of MPK6 in regulating cotyledon opening. Activation of MPK6 by MKK10 led to the phosphorylation of PIF3 and accelerated its turnover in transgenic seedlings.
Genetic and biochemical evidences not only show that MEK1-MPK6 cascade AtRBOHD/F-dependent H2O2 and NIA1-dependent NO are all involved in dark-induced stomatal closure in Arabidopsis also indicate that MEK1-MPK6 cascade functions via working downstream of H2O2 and upstream of NO.
abscisic acid and jasmonate mediate inactivation of the immune-associated MAP kinases (MAPKs) MPK3 and MPK6 in Arabidopsis thaliana ABA induced expression of genes encoding the protein phosphatases 2C (PP2Cs) HAI1 HAI2 and HAI3 through ABF/AREB transcription factors
results indicated that AIK1-MKK5-MPK6 functions in ABA responses and requires ABA-responsive gene expression to regulate ABA-inhibited root growth and cell division. The ABA signaling pathway regulates this MAPK cascade.
Study propose that the pathogen-responsive MPK3/MPK6 cascade and ABA are two essential signaling pathways that control respectively the organic acid metabolism and ion channels two main branches of osmotic regulation in guard cells that function interdependently to control stomatal opening/closure.
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