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NITRATE EFFECT ON Pfr‐MEDIATED AND GA 3 ‐INDUCED GERMINATION IN SPORES OF Anemia phyllitidis (L.) Sw *
Author(s) -
Haas Christian J.,
Kopp Hannelore,
Scheruerlein Robert
Publication year - 1992
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1992.tb02214.x
Subject(s) - germination , gibberellic acid , phytochrome , spore , signal transduction , gibberellin , chemistry , biology , botany , biochemistry , red light
— Spore germination in Anemia phyllitidis can be induced by red light (R) via the phytochrome system and by gibberellic acid (GA 3 ) in the dark. An enhancing effect of NO 3 ‐ions on the Pfr‐mediated germination could be demonstrated. This NO 3 ‐effect was found to be pronounced during the preinduction phase and could be described by biphasic kinetics depending on the formation of Pfr by the R‐irradiation. Besides NO 3 , other electron accepting substances also increased germination significantly. In contrast to Pfr‐mediated germination, no enhancing effect by NO 3 could be obtained for the GA 3 ‐induced germination response. The application of an inhibitor of gibberellic acid synthesis, AMO1618, as well as the analysis of combined R and GA 3 treatment, support the hypothesis that for germination of Anemia phyllitidis spores no synergism between the factors exists. Thus, it is proposed that the gibberellic acid receptor starts a signal‐transduction pathway resulting in germination which is in part independent of the Pfr‐mediated signal‐transduction chain. The NO 3 ‐effect is specific for the Pfr‐mediated signal‐transduction chain.