Institute of Biochemistry and Plant Ecophysiology, National Research Council, 00016 Monterotondo Scalo, Rome, Italy.
Plant Physiol. 1988 May;87(1):176-8. doi: 10.1104/pp.87.1.176.
The action of exogenous polyamines (putrescine, spermidine, and spermine) on ;washing' and fusicoccin-stimulated K(+) uptake and H(+) extrusion through the plasmamembrane in maize (Zea mays L., hybrid line Plenus S 516) root apical segments was studied. The results showed that polyamines inhibit the washing-stimulated K(+) influx and H(+) extrusion without interfering with K(+) uptake and H(+) extrusion stimulated by fusicoccin. Spermidine appeared to be the most effective in inhibiting K(+) uptake and H(+) extrusion while putrescine showed a smaller inhibiting action with respect to the others. The analysis of kinetic constants indicated that the polyamines behave as competitive inhibitors with respect to K(+).
研究了外源多胺(腐胺、亚精胺和精胺)对玉米(Zea mays L.,杂种品系 Plenus S 516)根尖段质膜“洗涤”和激离素刺激的 K(+)摄取和 H(+)外排的作用。结果表明,多胺抑制洗涤刺激的 K(+)内流和 H(+)外排,而不干扰激离素刺激的 K(+)摄取和 H(+)外排。亚精胺似乎对抑制 K(+)摄取和 H(+)外排最有效,而腐胺的抑制作用较小。动力学常数分析表明,多胺对 K(+)表现出竞争性抑制作用。