Premium
Effect of abscisic acid on CO 2 exchange in Lemna gibba
Author(s) -
Tillberg Elisabeth,
Dons Christian,
Haugstad May,
Nilsen Stein
Publication year - 1981
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.1399-3054.1981.tb02707.x
Subject(s) - lemna gibba , photorespiration , photosynthesis , abscisic acid , lemna , respiration , botany , biology , horticulture , chemistry , biochemistry , aquatic plant , ecology , macrophyte , gene
The effects of abscisic acid (ABA) on photosynthesis, dark respiration, and photorespiration were studied in Lemna gibba L. plants. The initial concentration of ABA in the nutrient solution was 10 −7 M and in a few experiments, 10 −6 M. The cultures were grown in the same solution for time periods ranging from one hour to 12 days. Net photosynthesis, measured as CO 2 uptake by infrared gas analyser technique, was inhibited after four hours of ABA treatment and reached a minimum after four to seven days depending on the time of the year. After 12 days a substantial recovery of photosynthesis was observed. Dark respiration was significantly stimulated after two to seven days of ABA treatment but then returned to the control level. The transient effects of ABA on photosynthesis and dark respiration corresponded to the previously measured time course of [ 14 C]‐ABA uptake by Lemna . Photorespiration measured as oxygen inhibition of photosynthesis was not affected by ABA.