The Kinetics of Root Gravitropism: Dual Motors and Sensors

摘要: The Cholodny-Went theory of tropisms has served as a framework for investigation root gravitropism nearly three quarters century. Recent investigations using modern techniques have generated findings consistent with the classical theory, including confirmation asymmetrical distribution polar auxin transport carriers, molecular evidence asymmetry following gravistimulation, and generation response mutants predictable lesions in gravitropism. Other results indicate that model is inadequate to account key features Initiation curvature, example, occurs outside region most rapid elongation driven by differential acceleration rather than inhibition elongation. indicates there are two motors driving gravitropism, one which appears not be regulated. We recently developed technology capable maintaining constant angle gravistimulation at any selected target while continuously monitoring growth curvature kinetics. This review elaborates on advantages this new analyzing describes applications reveal (1) existence least phases gravitropic motor output, even under conditions stimulus input (2) gravity sensing cap. propose revised dual sensors interacting accomplish only systems linked theory.