Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

Asymimetry of indoleacetic acid distribution has been associated with the development of plant bioelectric potentials. In the absence of auxin, no detectable potential develops, but when auxin is supplied auxin asymmetries caused by differences in transport give rise to bioelectric potentials (4, 6). Recently (2) it was demonstrated that under anoxia, where no potential develops, corn coleoptiles still showed geotropic curvature response. This raised 3 related questions: A) Are geoelectric potentials a mandatory consequence of auxin transport-induced asymmetries? B) If gravity-ilnduced asymmetries