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Roles of RCN1-regulated PP2A activity in etiolated hypocotyls. RCN1-regulated PP2A activity controls hypocotyl elongation and gravity response through genetically separable pathways in dark-grown seedlings. PP2A activity controls elongation through a pathway requiring regulated ethylene biosynthesis and response, while PP2A control of gravity response involves regulation of auxin transport but is independent of ethylene response.
