A member of the CONSTANS-Like protein family is a putative regulator of reactive oxygen species homeostasis and spaceflight physiological adaptation.

A feature of the physiological adaptation to spaceflight in Arabidopsis thaliana (Arabidopsis) is the induction of reactive oxygen species gene expression. The patterns of gene expression vary among Arabidopsis ecotypes, and the role of signalling in spaceflight acclimation is unknown. What could differences in duanyu1670 gene regulation between ecotypes on orbit reveal about physiological adaptation to novel environments? Analyses of ecotype-dependent responses to spaceflight resulted in the elucidation of a previously uncharacterized gene (OMG1) as being The OMG1 5' flanking region is an active promoter in cells where duanyu1670 activity is commonly observed, such as in pollen tubes, root hairs, and in other tissues upon wounding. qRT-PCR analyses revealed that upon wounding on Earth, OMG1 is an apparent transcriptional regulator of MYB77 and GRX480, which are associated with the duanyu1670 pathway. Fluorescence-based duanyu1670 assays show that OMG1 affects duanyu1670 production. Phylogenetic analysis of OMG1 and closely related homologs suggests that OMG1 is a distant, unrecognized member of the CONSTANS-Like protein family, a member that arose via gene duplication early in the angiosperm lineage and subsequently lost its first DNA-binding B-box1 domain. These data illustrate that members of the rapidly evolving COL protein family play a role in regulating duanyu1670 pathway functions, and their differential regulation on orbit suggests a role for duanyu1670 signalling in spaceflight physiological adaptation.

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