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ABP1 Regulates Cellular Growth.
ABP1 rapidly stimulates the activity of the plasma membrane-ATPase and K+-channels by an as yet unknown pathway. The plasma membrane-ATPase will lead to the acidification of the extracellular space, which in turn activates pH-sensitive expansion, causing cell wall loosening. Simultaneously, K+ influx through inward rectifying-K+-channels will ultimately lead to enhanced cellular water uptake. Both processes jointly allow for turgor-induced growth.
