Tissue- and isoform-specific phytochrome regulation of light-dependent anthocyanin accumulation in Arabidopsis
Sankalpi N Warnasooriya1, Katie J Porter, Beronda L Montgomery
1Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI, USA.
Abstract:
Phytochromes regulate light- and sucrose-dependent anthocyanin synthesis and accumulation in many plants. Mesophyll-specific phyA alone has been linked to the regulation of anthocyanin accumulation in response to far-red light in Arabidopsis thaliana. However, multiple mesophyll-localized phytochromes were implicated in the photoregulation of anthocyanin accumulation in red-light conditions. Here, we report a role for mesophyll-specific phyA in blue-light-dependent regulation of anthocyanin levels and novel roles for individual phy isoforms in the regulation of anthocyanin accumulation under red illumination. These results provide new insight into spatial- and isoform-specific regulation of pigmentation by phytochromes in A. thaliana.
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