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
Kinetic studies of cobalt absorption by excised roots of barley (Hordeum vulgare L.) exhibited a Q10 of 2.2 in a concentration range of 1 to100 µM CoCl2. It has been suggested that a number of carrier sites are available, which are concentration dependent (24). Entry of divalent cations in the roots of maize is accompanied by a decrease in the pH of the incubation media and of the cell sap and also a decrease in the malate content (25). The uptake by different species probably depends on the various physiological and biological needs of the species (26,27).

Accumulation of cobalt by forage plants has been studied in wetlands, grasslands, and forests close to landfills and mines (11,28,29). Irrigation with cobalt-rich water in meadows has shown high intake of cobalt, which was also demonstrated in the blood serum and plasma of bulls fed on the hay grown in the field (29). African buffalos (Syncerus caffer Sparrman) in the Kruger National Park (KNP) downwind of mining and refining of cobalt, copper, and manganese showed the presence of the metals in liver in amounts related significantly to age and gender differences (30).