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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1489-1497
© 1986

Article

Potassium Transport in Non-Growing Corn Root Tissue as Affected by IAA and GA3

Sharon A. Rogers and John B. Hanson

Department of Plant Biology, University of Illinois Urbana, IL 61801, U.S.A.

Experiments were done to determine if the spontaneous recovery of non-growing segments of corn root (Zea mays L.) from excision injury is dependent on auxin. Washing the segments with 5 run indoleacetic acid (IAA) for 2 to 4 hours gave a small but significant increase in K+ (86Rb) influx, used here as a parameter reflecting recovery of electrogenie H+-efflux pumping. This promotive effect was obtained only after an hour of washing, and was sustained by 100 nm gibberellic acid (GA3). Any early responses to auxin were obscured by an adverse reaction of the root cells to external IAA which resulted in a transitory inhibition of H+ pumping and K+ influx.

Pretreatment of excised root tips with 10 µM IAA in the grinding medium protected a plasmalemma-enriched fraction of the microsomes during isolation, giving increased uncoupler-sensitive ATPase activity.

Non-growing root tissue thus shows three responses to auxin: an adverse reaction at the outer surface of the plasmalemma which blocks H+ pumping; a protective or restorative effect on the H+-ATPase; an increased capacity for K+ influx during the developmental phase of washing, which is augmented by the presence of GA3.

(Received March 31, 1986; Accepted September 8, 1986)
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