The biosynthesis of the cytochrome b6f complex has been studied in a mutant, no. 1073, of Lemna perpusilla that contained less than 1% of the four protein subunits when compared with a wild-type strain. RNA gel blot analyses of the mutant indicated that the chloroplast genes for cytochrome f , cytochrome b6, and subunit IV (petA, petB, and petD, respectively) are transcribed and that the petB a...

Turions play an important role in the survival strategy of the duckweed Spirodela polyrhiza. Therefore, factors influencing the formation of these survival organs were studied. Phosphate deficiency is the main natural factor inducing turion formation and the specific turion yield (SY), i.e. the number of turions formed per frond, varied widely for five different clones from different climate zo...

Acrylamide is a monomer widely used as an intermediate in the production of organic chemicals, e.g. polyacrylamides (PAMs). Since PAMs are low cost chemicals with applications in various industries and waste- and drinking water treatment, a certain amount of non-polymerised acrylamide is expected to end up in waterways. PAMs are non-toxic but acrylamide induces neurotoxic effects in humans and ...

Sterile embryos of barley (Hordeum vulgare) and cultures of Lemna perpusilla have been labeled with (32)Pi and the chromatin proteins prepared and separated by acid-urea and sodium dodecyl sulfate gel electrophoresis. Under these conditions chromatin proteins became labeled and the gel radioactivity profiles which were complex indicated a probable minimum of 15 to 20 proteins phosphorylated wit...