SCR — Arabidopsis thaliana

Summary

AT3G54220 (SCR, also known as SGR1 or SCARECROW) encodes a GRAS family transcription factor with sequence-specific DNA binding activity, localised to the nucleus and Golgi complex. In Arabidopsis thaliana, SCR is associated with asymmetric stem cell division, stem cell development and renewal, endoderm and bundle sheath cell fate specification, Casparian strip assembly, root radial pattern formation, shoot apical meristem development, amyloplast organisation, chlorophyll a breakdown, folate metabolism, and regulation of hormone metabolism. It is linked to numerous agronomic traits including yield, plant height, root length and thickness, leaf colour and senescence, stem elongation and senescence, seed maturation, adventitious root number, callus induction, auxin and sugar content, and oxidative stress response. Phenotypic associations include root growth, gravitropism, chlorophyll degradation and retention, and photosynthetic CO₂ assimilation. Studies of related genes in other species connect the SCR family to fruit ripening and carotenoid, lycopene, anthocyanin and chlorophyll content.