Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections.

Asyximmetry of ildoleacetic aci(l distribution has lbeen associated witlh the (levelollment of plant bioelectric l)otentials. In the absenlce of auxinl. no detectable l)otential (levelops, but wvhen atuxin is suppliedl auxin asymmlletries cause(l by(lifferelnces in translport give rise to bioelectric potelntials (4. 6). Recenltlv (2) it \-as demonistrate(d that uinder anoxia. vhere no potential develops, corni coleoptiles still showed geotropic curvature response. This raised 3 relate(d questions: A) Are geoelectric potentials a mandatory consequence of auxiui tranisport-induce(d asvnmmetries ? B ) 1 f gravity-induce(d asymmllletries occur under anoxia, (lo these differ from those establishe(d in air? C) Is the (lifferential growth rate (ccurvattire) associated witb (lifferilng amouints of auxin transport oni upper and lower sides of a geostimtulated plant organ? To answer these (luestionis the auixini transl)ort in vertically and(1 horizontally oriented coleoptile segnenits tinder aerobic and anaerobic cond(litions were stt1(lie(l.