Molybdenum is a key microelement in plant vital functioning. The microelement can be absorbed by the plants only in the form of molybdate-anion.  The Molybdenum deficiency affects negatively to the most important agricultural growing.  As molybdenum takes part in such vital mechanisms as nitrogen and sulfur metabolism, plant hormone biosynthesis, and purine banding catabolism. Molybdenum is included in enzyme content which is called molybdoenzyms. Having bonded with molybdopterin it creates molybdenum co-factor (Moco) and gets oxidation-reduction properties. Moco is included in active site of molybdoenzymes. They take part in sulfur and nitrogen metabolism, and detrimental compound detoxication. Molybdenum deficiency is characterized by the slow plant growth, low amount of chlorophyll ascorbic acid capacity.It was noticed that plants suffering from the molybdenum deficiency can be saved, sodium molibdate can be used, it can be put directly in the soil or plant leaves can sprayed with the solution. There are five plant molibdoenzymes which are currently known: sulfite oxidase (SO), xanthine dehydrogenase (XD), nitrate reductase (NR), aldehyde oxidase (AO) and mitochondrial amidoxim-regenerative component. Nitrate reductase catalyzes the first stage of nitrate assimilation, eucariotic organisms contain three isoforms of the molybdoezimes: A NADH, A NAD(P)H и NADPH.  Xanthine dehydrogenase regulates purine metabolism. XD increases plant antioxidant ability and slows down leaves aging. Molybdoenzymess are involved in the process of the stress adaptation, defining of the mechanisms and their reaction to environmental stress conditions is important for plant stress resistance.

Molybdenum is a key microelement in plant functioning, as it takes part in oxidation-reduction reaction of nitrogen and sulphuric exchange, plant hormone biosynthesis, and xenobiotic detoxication. Molybdenum deficiency is widely spread among pulses and some vegetable crops, which are intensively irrigated, or which grow in acid or sandy soils. Plant cells can absorb molybdenum in the form of molybdate oxyanion. Even though molybdenum is available for a cell, it is biologically inactive element until there is a formed complex of molybdenum co-factor (Moco). Moco is situated in the active center of molybdenum ferments, which are used as short bonds of electron passage and take part in nitrogen and sulfur metabolism, hormone biosynthesis, and plant harmful bond detoxification. There are known four molybdenum ferments of higher plants such as nitrate reductase (NR), xanthine dehydrogenase (XDH), aldehyde oxidase (AO), and sulfite oxidase (SO). Tungsten (T) is molybdenum antagonist. It pushes molybdenum out of mobdoenzymes, as a result molybdenum-containing enzymes become inactive. Molybdenum is a vital element which is in minimal qualities required for plant growth and development. On the other hand, huge amount of Molybdenum is toxic, and its complete absence is lethal for the plant organism. As a result, the search for the perfect molybdenum concentration for the growth and development plays an important role in agriculture. Nicotiana Benthamiana, or Australian tobacco was used as a model plant, it is nightshade family (Solanaceae). The article presents sodium molybdate (Na2MoO4•2H2O), sodium wolframate (Na2WO4•2H2O), and molybdate with wolframate influence to germinating capacity and length of Nicotiana Benthamiana plantlets.