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Reverse bimodal action of 2,2,2‐trifluoroethanol on Rumex crispus seed germination
Author(s) -
Taylorson R. B.
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.tb01990.x
Subject(s) - germination , rumex , chemistry , botany , biology
Light‐stimulated germination of R. crispus L. seed is inhibited by pretreatment with 5 m M 2,2,2‐trifluoroethanol, whereas at higher concentrations (0.1 M ) germination is greatly enhanced. The action is the reverse of the usual promotion‐inhibition order of bimodal response to applied substances. In darkness, 0.1 M trifluoroethanol promotes germination. Germination of eight other species (including R. obtusifolius L. and R. acetosella L.) is inhibited by levels of trifluoroethanol that promote germination of R. crispus . Ethanol inhibition of light‐stimulated germination of R. crispus can be partially offset by simultaneous treatment with 0.1 M trifluoroethanol. Similarly, inhibition of the light‐stimulated germination of R. crispus seeds by 5 m M trifluoroethanol can be partially offset by simultaneous treatment with 2‐propanol. The inhibitory and promotive actions of trifluoroethanol may be caused by a specific enzyme inhibition and an anaesthetic effect, respectively.