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Abscisic acid induced decay of strawberry transpiration
Author(s) -
Kubik M.,
Plonka A.
Publication year - 1984
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.1399-3054.1984.tb04923.x
Subject(s) - transpiration , abscisic acid , guard cell , chemistry , darkness , botany , horticulture , biophysics , biology , photosynthesis , biochemistry , gene
The effect of 0–7.5 × 10 −3 μmol abscisic acid (ABA) on the transpiration of strawberry ( Fragaria grandiflora Duch. ev. Red gauntlet), both under illumination and in darkness, was investigated with the use of an infrared gas analyser. Mathematical analysis of the results suggests that the decrease in transpiration after darkening can be described by a series of first‐order processes with continuous distribution of rate constants k. Application of ABA makes the rate constant distribution narrower, so that one single rate constant occurs at the highest doses. ABA accelerates the decrease of transpiration more in darkness than under illumination. This suggests that the process of efflux of osmotically active particles from guard cells is influenced more than influx. For ABA doses greater than 7.5 × 10 4 μmol, the transpiration decreases in two stages, of which only the first one seems to be affected by ABA: but above this dose further acceleration of decay of transpiration after darkening is not observed. The observations may indicate that above this critical dose of ABA the rate determining step consists in guard cell wall relaxation rather than in efflux of osmotica.