Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525546
Title Inhibition of growth and metabolism of Chlorella and some other plant types by calcium dipicrylamine and other poisons
Author(s) Bierhuizen, J.F.
Source University. Promotor(en): E.C. Wassink. - Wageningen : Veenman - 59
Publication type Dissertation, internally prepared
Publication year 1957
Keyword(s) plantenfysiologie - groei - plantenontwikkeling - metabolisme - plantenvoeding - assimilatie - toxische stoffen - chemie - indicatorplanten - chemische analyse - blootstelling - milieuafbraak - kinetica - chemische factoren - ecotoxicologie - plant physiology - growth - plant development - metabolism - plant nutrition - assimilation - toxic substances - chemistry - indicator plants - chemical analysis - exposure - environmental degradation - kinetics - chemical factors - ecotoxicology
Categories Photosynthesis
Abstract If potassium is obtained from sea-water by precipitation with calcium dipicrylamine, potassium fertilizers and sea-water will be contaminated with a little dipicrylamine. The influence of calcium dipicrylamine on metabolism of Chlorella and some other aquatic and terrestrial plants was therefore studied. It inhibited photosynthesis even at lower concentrations (10 -6-10 -5M), than other inhibitors such as ethyl urethane, phenyl urethane, hydroxylamine, 2,4-dinitrophenol and sodium azide. Autotrophic growth was inhibited at almost the same concentration. But heterotrophic growth of Chlorella was less inhibited. Respiration was stimulated by up to 60 %, even at 10 -2M. At this concentration, glucose-stimulated respiration was 50 % inhibited but at least partly reversibly. The same degree of inhibition (not reversible by washing) was observed with light saturation as with light limitation in Chlorella photosynthesis. This suggested a specific enzyme- inhibitor, influencing certain dark reactions as well as the energy transfer in photosynthesis. Lower temperatures severely increased inhibition of photosynthesis in Chlorella.

Despite inhibition of growth and photosynthesis at low concentrations in water culture, the compound was less harmful in the field through the high adsorptive capacity of soil, especially of humus. Only with extreme artificial contamination was there a decrease in yield.

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