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Introduction to plant pathogenic microorganism
Learn Agricultural Microbiology with Braimy – B.Sc. agriculture
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  • Basic constituent of all organic compounds is carbon (C). The source of organic carbon compounds in nature is carbon dioxide present in the atmosphere & is in dissolved condition in water on the earth.
  • Green plants, certain bacteria & algae use CO­2 through photosynthesis in the presence of sunlight to produce carbohydrates, simple fats, utilized & digested by animals.
  • Flesh eating animals feed on herbivores & the carbon compounds are again digested & converted into other forms.
  • Carbon is released in the form of carbon dioxide in respiration of plants & animals.
  • Bacteria & fungi attack dead remains of plants & animals and degrade the complex organic compounds into simple substances which are the available for other cycle.
  • In animals, carbon may get tied up in hard parts such as shells & hence remain in the form of inorganic carbonates for long times.
  • Marine deposits of animal carbonates & inorganic precipitation of carbonate in water may result into limestone. Through erosion & dissolutions, limestone can return carbonate very slow to the living carbon cycle.
  • Carbon may also get fixed into organic deposits of coal & petroleum, where it may remain for millions of years unless released by combustion. In this way, part of organic carbon becomes incorporated into the earth’s crust as coal, gas, petroleum, limestone & coral reef.

Microbes like- Trichoderma, Aspergillus, Penicillium, Marasmus, Ganoderma, Psalloitta, Coryne-bacterium, Methanosomonas & anaerobic purple sulphur bacteria helps in the decomposition of plant residues into carbon-dioxide, water, methane & sulphur-dioxide. While the animal residues are also decomposed into CO2, H2O, CH4& SO2 by above mentioned microbes except Marasmus, Ganoderma & Psalloitta microbes.

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