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APICAL GROWTH OF PROTONEMATA IN ADIANTUM CAPILLUSVENERIS. I. RED FAR‐RED REVERSIBLE EFFECT ON GROWTH CESSATION IN THE DARK
Author(s) -
KADOTA AKEO,
FURUYA MASAKI
Publication year - 1977
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1977.00357.x
Subject(s) - protonema , phytochrome , darkness , far red , apical cell , red light , biology , botany , biophysics , blue light , optics , cell , biochemistry , physics , moss
Apical growth of individual protonemata in Adiantum capillus‐veneris was microphotographically observed before, during and after light treatment. When single‐celled protonemata precultured under continuous red light were transferred to darkness, the apical growth continued for the next 24 hr at a rate somewhat slower than that under continuous red light, but the rate significantly decreased thereafter and growth ceased within 72 hr in the dark. The growth in the dark was strongly inhibited by a brief irradiation with far‐red light given immediately before the dark period, and the effect of far‐red light was fully reversed by subsequent red light. This reversibility was repeatedly observed, suggesting the involvement of a phytochrome system. The intracellular localization of the phytochrome system in the protonemata was studied, using a narrow‐beam irradiator. The results showed that the photoreceptive sites of far‐red light are not localized in any particular region of the cell.