| Abstrakt: |
Abstract: Using detached leaves of potato plants (Solanum tuberosum cv. Bintje) it was shown that abscisic acid (ABA) induced an oriented transport of ions (86Rb,32P and3SS) towards the hormone-treated leaflet. In order to understand the hormone effect on cell permeability, pretreatment of discs with hormonal solution was conducted. The pretreatment with ABA stimulated the uptake of K+ simultaneously with the decrease of efflux. The effect of ABA on ion uptake is compared with the action of other hormones, benzylaminopurine (BAP), gibberellic acid (GA3) known to act over a long distance transport, too. Three kinds of specificity are underlined: - hormonal specificity (stimulation by ABA and inhibiton by BAP of K+ uptake by foliar tissues); - ionic specificity (ABA increase86Rb influx, but inhibits32P and3SS influx); - tissue specificity shown by a comparative study between foliar tissues (source) and tuber tissues (sink). The autoradiography of foliar discs demonstrated that a treatment of foliar discs can be used, at least for Rb+ (K), to study role of ABA in long-distance transport. |
