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Lack of active K + uptake in aeroponically grown wheat seedlings
Author(s) -
Zsoldos Ferenc,
Vashegyi Ágnes,
Erdei László
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb04356.x
Subject(s) - chemistry , shoot , plant growth , dry weight , relative humidity , horticulture , botany , biology , physics , thermodynamics
The K + ( 86 Rb + ) uptake and the growth of intact wheat seedlings ( Triticum aestivum L. cv. GK Szeged) grown in 0.5 m M CaCl 2 solution and of seedlings grown on wet filter paper in Petri dishes were compared under different experimental conditions. Aeroponic (AP) and hydroponic (HP) conditions brought about striking differences in the growth of the roots, whereas the shoot growth was not influenced. The dry weight of the roots was higher for the AP plants than for the HP plants. The AP grown seedlings exhibit a low rate of K + uptake, which seems to be a passive process. The effect of 2, 4–dinitrophenol (2, 4–DNP) clearly shows the absence of an active component of the K + uptake in roots grown in air with a high relative humidity. In plants grown under AP conditions the effect of Ca 2+ on the K + uptake is unfavourable, i.e. there is an inhibition (negative Viets effect). Results relating to the effect of 2,4–DNP suggest that the “negative Viets effect” is a feature of the passive K + uptake. The data suggest that the AP growth conditions play a very important role in the induction and/or development of the ion transport system(s), which becomes impaired under the AP conditions.