PJB-1988-9
Abscisic acid stimulated intercellular fluxes of potassium in excised roots of maize,
A.N. CHANNA AND J.C. COLLINS
Abstract
Compartmental analysis were carried out to determine the influence of ABA on the intercellular fluxes of K in excised roots of zea mays L. the rate of influx was sensitive to ambient temperature and the tissus take about 24 hours to reach an eqyulibrium . ABA stimulated K influx rate
at 15-250C, but did not alter the pattern of
influx . the cytoplasmic content ‘Qc’ and the efflux at both the plasmalemma and tonoplast membrance were also increased by ABA , the net tracer uptake, however
was little affected by ABA . In excised maize root , K was actively transported inwards.
It is concluded that extermal ly applied ABA promotes intercellular fluxes of K and that interacts with energy-linked K pump. A model based on these results id described.
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