Abstract
In short-term (1 h) uptake experiments GA3(10-5M) stimulated Pi uptake into maize root cortex cells by 28.7 %, Ethrel (10-3M) inhibited it by 18.5 % and BA, IAA, and ABA were inactive. In long-term (5 h) experiments ABA remained inactive, GA3 lost its stimulatory effect, and BA (5. 10-6M), IAA (10-4 -10-5M), and Ethrel (10-3 -5. 10-4M) decreased Pi uptake. When the hormones were present only during 3 h preincubation (“augmentation”) period ABA was inactive, GA3 slightly raised and BA, IAA, and Ethrel slowed down subsequent Pi uptake.
BA(10-7 –10-5M) decreased xylem sap volume flow and Pi translocation. ABA in all tested concentrations (10-8 –10-5M) reduced exudation rate and Pi translocation, its effect declining with time. IAA effect strongly depended on concentration used and on application time and varied from strong inhibition to moderate stimulation of both volume flow and Pi translocation. GA3 (10-7M) slightly stimulated xylem volume flow but inhibited phosphate translocation. Ethrel (10-4 and 10-5M) increased both parameters, but Pi transloeation much more than volume flow. IAA, BA, and ABA influenced volume flow and P transloeation to the same extent leaving Pi concentration in the xylem sap unchanged. GA3 and Ethrel influence Pi concentration in the xylem sap and it is thus probable that these hormones regulate release of phosphate ions into the xylem sap.
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Abbreviations
- Pi :
-
inorganic phosphate
- IAA:
-
indol-3-yl-acetic acid
- GA3 :
-
gibberellic acid
- ABA:
-
abscisic acid
- BA:
-
benzyladenine
- Ethrel:
-
2-chloroethyl phosphonic acid
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Macháčková, I., Trčková, M. & Zmkhal, Z. The effect of plant hormones on phosphate uptake and translocation in maize roots. Biol Plant 28, 68–72 (1986). https://doi.org/10.1007/BF02885328
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DOI: https://doi.org/10.1007/BF02885328