ABA and Melatonin: Players on the Same Field?

In plants, abscisic acid (ABA) and melatonin (MT) are conventionally treated as molecules mitigating stress responses. To understand the mechanisms of ABA-MT interplay, we examined the effects of ABA and MT treatment in ABA and MT loss-of-function mutants of <i>Arabidopsis thaliana</i> exposed to high light (HL) stress. ABA constantly suppressed <i>ASMT</i> encoding N-acetylserotonin methyltransferase in the context of differential responses of other MT biosynthesis genes in both the wild type (WT) and mutants. However, this response was absent in the mutant with the disrupted ABI4. Given that the <i>ASMT</i> promoter region contains several potential ABI4-binding elements, these data suggest that <i>ASMT</i> can be a potential target gene for ABI4. A role for ABI4 in the interactions between ABA and MT is supported by the finding that <i>ABI4</i> is constitutively derepressed in the MT signaling mutants <i>cand2</i> and <i>gpa1</i>, which exhibited elevated steady state levels of <i>ABI4</i> transcripts and were not regulated by either stress or melatonin. In addition, the <i>abi4</i> mutant showed increased modulations in the expression of the MT catabolic genes <i>M2H</i> and <i>M3H</i> in response to ABA treatment, inferring that this transcription factor is a negative regulator of ABA-dependent changes in MT content. Furthermore, all tested mutants with impaired ABA synthesis or signaling displayed elevated steady state MT levels compared to WT, while MT treatment contributed to the downregulation of key ABA synthesis and signaling genes. Collectively, our results suggest that ABA and melatonin act antagonistically, modulating the expression of ABA and MT signaling and metabolism genes. To understand the mechanisms of ABA-MT interactions, we studied the effects of ABA and MT treatment in ABA and MT loss-of-function mutants of <i>Arabidopsis thaliana</i> exposed to severe light stress (SLS).