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The effect of abscisic acid on chlorophyll fluorescence in lichens under extreme water regimes
Author(s) -
DIETZ S.,
HARTUNG W.
Publication year - 1999
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.1999.00473.x
Subject(s) - abscisic acid , lichen , chlorophyll fluorescence , photosynthesis , saturation (graph theory) , desiccation , chlorophyll , botany , chemistry , fluorescence , chlorophyll a , desiccation tolerance , biology , biochemistry , mathematics , physics , combinatorics , quantum mechanics , gene
Chlorophyll fluorescence measurements were used to test whether externally applied abscisic acid (ABA) has an effect on the desiccation tolerance of lichens and their sensitivity to constant water saturation. A surplus of ABA did not decrease the time required to regain full photosynthetic capacity after prolonged dry periods. However, an effect of ABA could be observed when lichens were permanently hydrated at moderately high temperatures. Lichens suffered less from constant saturation if ABA was added to the incubation medium. These results suggest a positive effect of ABA on membrane function.