Sensitivity of the proton and ion transport mechanisms of corn roots to injury
1980
Gronewald, J.W. | Hanson, J.B. (Illinois Univ., Urbana (USA). Dept. of Botany)
Cutting solution-grown corn (Zea mays L.) roots into segments causes a rapid reduction in K('+) (('86)RB) influx, ('36)Cl influx, and net H('+) efflux. The reduction in K('+) influx is a function of segment length; other injuries, such as a brief exposure to ice temperatures or low pH, will also reduce K('+) influx. Washing the segments in dilute, aerated CaCl(,2) solutions produces recovery of the fluxes. In contrast, cutting does not reduce phosphate (('32)P) influx, although after a lag period there is a small enhancement of influx of the type previously reported. Estimations of actual H('+) efflux (net H('+) efflux plus anion influx) show that H('+) efflux recovers more rapidly than K('+) influx. It is proposed that injuries signal a partial collapse of an electrogenic H('+)/K('+)-ATPase of the plasmalemma, and washing restores it
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