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Beurteilung der Molybdänversorgung von Pflanzen mit Hilfe der Moinduzierbaren Nitratreduktase‐Aktivität
Author(s) -
Witt H. H.,
Jungk A.
Publication year - 1977
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19771400210
Subject(s) - molybdenum , nitrate reductase , nitrate , chemistry , spinach , economic shortage , potassium , horticulture , biology , inorganic chemistry , biochemistry , linguistics , philosophy , organic chemistry , government (linguistics)
Evaluation of the molybdenum nutritional status of plants by using the Mo‐inducible nitrate reductase activity The effect of molybdenum on the nitrate reductase activity (NRA) in leaf discs was studied using Poinsettia, Tomato, Cucumber and Spinach plants. Results were as follows: 1. In the molybdenum deficient range NRA depends strongly on molybdenum supply. In this range yield and NRA are closely correlated. Beyond the critical value molybdenum does not affect NRA whereas the Mo‐content of the plant material still increases. 2. Under adequate Mo‐supply NRA varies with plant species and environmental factors. Shortage of nutrients other than Mo as e.g. nitrate, potassium and iron as well as high salt concentration decreased NRA inspite of ample Mo. Therefore, the absolute NRA value is not useful in determining the molybdenum status of plants. 3. In Mo‐deficient plants NRA is increased by infiltrating molybdenum in leaf discs during 2h of incubation. This effect does not occur in plants adequately supplied with Mo. Molybdenum inducible NRA can bei measured even if maximum NRA is limited by water stress or shortage of nitrate, potassium and iron.