Light direction and polarization

Kraml, Manfred

doi:10.1007/978-94-011-1884-2_16

Cited by 35 publications

(16 citation statements)

References 2 publications

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“…This contrasts with in vivo observations of lower plants, in which microbeam irradiation has revealed a very localised response and an action dichroism for phytochrome-mediated growth responses and chloroplast re-orientation (Kraml, 1994). These observations suggest that phytochromes associate, at least in lower plants, with the plasma membrane and that this probably involves as-yet-unknown protein-protein interactions.…”

Section: Phytochromescontrasting

confidence: 89%

Signal Transduction in Plants

Sopory¹,

Oelmüller²,

Maheshwari³

2001

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Section: Phytochromescontrasting

confidence: 89%

Signal Transduction in Plants

Sopory¹,

Oelmüller²,

Maheshwari³

2001

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“…Dedicated to Professor R/Jdiger on the occasion of his 60th birthday. which may or may not be linearly polarized [16]. This dichroic light perception through phytochrome is best demonstrated in plants with no intercellular communication such as in algal trichomes or fern protonemata [32].…”

Section: Introductionmentioning

confidence: 99%

Phytochrome of the green alga Mougeotia: cDNA sequence, autoregulation and phylogenetic position

Winands

Wagner

1996

Plant Mol Biol

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A cDNA clone encoding phytochrome (apoprotein) of the zygnematophycean green alga Mougeotia scalaris has been isolated and sequenced. The clone consisted of 3372 bp, encoded 1124 amino acids, and showed strainspecific nucleotide exchanges for M. scalaris, originating from different habitats. No indication was found of multiple phytochrome genes in Mougeotia. The 5' non-coding region of the Mougeotia PHY cDNA harbours a striking stem-loop structure. Homologies with higher-plant phytochromes were 52-53% for PHYA and 57-59% for PHYB. Highest homology scores were found with lower-plant phytochromes, for example 67% for Selaginella (Lycopodiopsida), 64% for Physcomitrella (Bryopsida) and 73% for Mesotaenium (Zygnematophyceae). In an unrooted phylogenetic tree, the position of Mougeotia PHY appeared most distant to all other known PHYs. The amino acids Gly-Val in the chromophore-binding domain (-Arg-Gly-Val-His-Gly-Cys-) were characteristic of the zygnematophycean PHYs known to date. There was no indication of a transmembrane region in Mougeotia phytochrome in particular, but a carboxyl-terminal 16-mer three-fold repeat in both, Mougeotia and Mesotaenium PHYs may represent a microtubule-binding domain. Unexpected for a non-angiosperm phytochrome, its expression was autoregulated in Mougeotia in a red/far-red reversible manner: under Pr conditions, phytochrome mRNA levels were tenfold higher than under Pfr conditions.

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“…In addition to spectroscopic studies, cell fractionation was also considered as an efficient tool to determine whether phytochromes are associated with membranes (Kraml, 1994). In summary, these studies indicated that phytochrome could be associated with various organelles and also with the plasma membrane.…”

Section: Cell Biological Methodsmentioning

confidence: 99%