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The role of calcium ions in phytochrome-mediated germination of spores ofOnoclea sensibilisL.

โœ Scribed by Randy Wayne; Peter K. Hepler

Publisher
Springer-Verlag
Year
1984
Tongue
English
Weight
891 KB
Volume
160
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

Phytochrome is confirmed to be the photoreceptor pigment in the germination response of Onoclea sensibilis L. by demonstrating red-far-red (R-FR) photoreversibility. External Ca 2+ is required for this response with a threshold at a submicromolar concentration. Ethylene glycol-bis(flamino-ethyl ether)-N,N,N',N'-tetraacetic acid, La 3+ and Co 2+ reversibly inhibit germination. Lanthanum only inhibits germination when applied before or during irradiation, indicating that the external Ca 2+ requirement is transient, although in the absence of Ca 2 + the R-stimulated system remains maximally poised to accept the ion for over 4 h after irradiation. The ability to respond to Ca 2+ 4.1 h after R-irradiation is not reversed by FR-irradiation, indicating that Ca 2+ transport has been uncoupled from phytochrome. Barium and Sr 2+, but not Mg 2+ can substitute for Ca 2 +. Artificially increasing the concentration of intracellular free Ca 2+ with the ionophore A 23187 stimulates germination in the dark. The CaZ+-calmodulin antagonists, trifluoperizine and chlorpromazine, reversibly inhibit germination. Calcium is required in phytochrome-mediated fern spore germination; it may be acting as a second messenger.

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