ZfN: Search Results

1	Author	Siegrid Schoch, Wolfram Schäfer	Requires cookie*
	Title	Tetrahydrogeranylgeraniol, a Precursor of Phytol in the Biosynthesis of Chlorophyll a — Localization of the Double Bonds
	Abstract	Pheophytins esterified with phytol and tetrahydrogeranylgeraniol are isolated from etiolated oat seedlings after short (1 min) exposure to light and a subsequent dark period of 15 to 20 min. After saponification of the pheophytins, a mixture of the alcohols was isolated. The structure of tetra hydrogeranylgeraniol was established as 3,7,11,15-tetramethyl-zl2'14 hexadecadiene-l-ol (3a). The implications for chlorophyll biosynthesis are discussed.
	Reference	Z. Naturforsch. 33c, 408—412 (1978); received March 23 1978
	Published	1978
	Keywords	Birthday Avena sativa, Gramineae, Oats, Chlorophyll Biosynthesis, Phytol
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	TEI-XML for	default:Reihe_C/33/ZNC-1978-33c-0408.pdf
	Identifier	ZNC-1978-33c-0408
	Volume	33

2	Author	Ute Laudenbach, Jürgen Kesselmeier	Requires cookie*
	Title	Some Observations on the Saponin Accumulation in Oat Seedlings and on the Transformation of the Avenacosides to the Antibiotic 26-Desgluco-avenacosides
	Abstract	The accumulation o f the steroidal saponins avenacoside A and B in oat was investigated in green and etiolated seedlings and was found to be strictly bound to the growth o f the seedlings. N o significant differences were detected between green and etiolated seedlings, showing that there is no relation between saponin accumulation and plastid developm ent. As the role o f the oat saponins has to be seen as a protective device against fungi and bacteria, the transformation o f the inactive avenacosides to their corresponding antibiotic 26-desgluco-avenacosides was tested in dependence o f pH and temperature. During disruption o f leaves, transformation occurs almost com pletely over a wide pH-range (pH 4 —pH 10); the degree o f transformation exhibits no distinct temperature optimum but a drastic decrease at 70 °C.
	Reference	Z. Naturforsch. 37c, 1095 (1982); received July 10 1982
	Published	1982
	Keywords	Saponin Accumulation, Antibiotic, /?-Glucosidase, Oat
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	TEI-XML for	default:Reihe_C/37/ZNC-1982-37c-1095.pdf
	Identifier	ZNC-1982-37c-1095
	Volume	37

3	Author	PetraH. Eilfeld, Gabriele Widerer, Heike Malinowski, Wolfhart Rüdiger, PeterG. Eilfeld	Requires cookie*
	Title	Topography of the Phytochrome Molecule as Determined from Chemical Modification of SH-Groups
	Abstract	124 kDa phytochrome has been isolated from etiolated oat seedlings. Specific chemical modifi-cation of SH-groups has been performed using several agents, especially mercurials. These proce-dures allowed covalent fluorescence labelling of phytochrome. Bleaching of the tetrapyrrole chromophore and reduced photoreversibility has been investigated and analyzed in terms of steric effects, i.e. size of the reagents and number of modified residues. The Pr form was found to exhibit two highly reactive SH-groups, the Pfr form three, however. Two highly reactive groups have been localized on the 55 kDa C-terminal half of the protein. The 3rd group predominantly reacting in the Pfr form has been localized on a 39 kDa chromopeptide, i.e. on the N-terminal half. The covalently attached fluoresceine chromophores were used as reporter groups. The envi-ronment of the fluoresceine chromophore is more hydrophobic in the Pfr form than in the Pr form, indicating that conformational changes take place during photoconversion.
	Reference	Z. Naturforsch. 43c, 63—73 (1988); received August 31 1987
	Published	1988
	Keywords	Oat, Avena sativa L, Mercurials, 124 kDa Phytochrome, Reporter Group
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	TEI-XML for	default:Reihe_C/43/ZNC-1988-43c-0063.pdf
	Identifier	ZNC-1988-43c-0063
	Volume	43