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  Section: Plant Nutrition » Other Beneficial Elements » Cobalt
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  Microorganisms and Lower Plants
    - Algae
    - Fungi
    - Moss
  Higher Plants
Uptake and Transport
  Absorption as Related to Properties of Plants
  Absorption as Related to Properties of Soil
  Accumulation as Related to the Rhizosphere
Cobalt Metabolism in Plants
Effect of Cobalt in Plants on Animals
Interaction of Cobalt with Metals and Other Chemicals in Mineral Metabolism
  Interaction of Cobalt with Iron
  Interaction of Cobalt with Zinc
  Interaction of Cobalt with Cadmium
  Interaction of Cobalt with Copper
  Interaction of Cobalt with Manganese
  Interaction of Cobalt with Chromium and Tin
  Interaction of Cobalt with Magnesium
  Interaction of Cobalt with Sulfur
  Interaction of Cobalt with Nickel
  Interaction of Cobalt with Cyanide
Beneficial Effects of Cobalt on Plants
  Drought Resistance
  Alkaloid Accumulation
  Vase Life
  Biocidal and Antifungal Activity
  Ethylene Biosynthesis
  Nitrogen Fixation
Cobalt Tolerance by Plants
  Higher Plants

Cobalt has long been known to be a micronutrient for animals, including human beings, where it is a constituent of vitamin B12 (1). However, its presence and function has not been recorded to the same extent in higher plants as in animals, leading to the suggestion that vegetarians and herbivorous animals need to ingest extra cobalt or vitamin B12 in diets to prevent deficiency. Vitamin B12 is synthesized in some bacteria, but not in animals and plants (1). Intestinal absorption and subsequent plasma transport of vitamin B12 are mediated by specific vitamin B12 proteins and their receptors in mammals. Vitamin B12, taken up by the cells, is converted enzymatically into methyl and adenosyl vitamin B12, which function as coenzymes. Feeding trials of cattle (Bos taurus L.), which also suffer from vitamin B12 deficiency, show that the normal diet is deficient in cobalt to the extent that supplemental provision of the element can improve their performance, something that could also be achieved by feeding them feedstuffs grown in cobalt-rich soil (2). The only physiological role so far definitely attributed to cobalt in higher plants has been in nitrogen fixation by leguminous plants (3).


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