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  1. 1. PRESENTATION ON SAPROPHYTIC NUTRITION IN PLANTS
  2. 2. SAPROPHYTIC NUTRITION  The mode of nutrition in which two plants of a same part of plant help each other in preparing their food is called saprophytic nutrition.  Saprophytic nutrition is that nutrition in which an organism obtains its food frm decaying organic matter. For ex- dead plants, dead animals, rotten bread etc
  3. 3.  'Sapros' refers to rotten and 'trophic' refers to food. Saprotrophic nutrition is the process by which the organisms feed on dead and decaying matter. The food is digested outside the cells or even the body of the organism - extracellular digestion. The organism secretes digestive juices that contain enzymes directly on to the food. The digestion makes the food soluble and it is then absorbed by the organism SAPROPHYTIC NUTRITION
  4. 4. PROCESS As matter decomposes within a medium in which a saprotroph is residing, the saprotroph breaks such matter down into its composites.  Proteins are broken down into their amino acid composites through the breaking of peptide bonds by proteases.  Lipids are broken down into fatty acids and glycerol by lipases.  Starch is broken down into simple disaccharides by amylases.
  5. 5. Contd .. These products are re-absorbed into the hypha through the cell wall via endocytosis and passed on throughout the mycelium complex. This facilitates the passage of such materials throughout the organism and allows for growth and, if necessary, repair
  6. 6. Conditions  In order for a saprotrophic organism to facilitate optimal growth and repair, favourable conditions and nutrients must be present.Optimal conditions refers to several conditions which optimise the growth of saprotrophic organisms, such as;  Presence of water: 80–90% of the fungus is composed of water by mass, and requires excess water for absorption due to the evaporation of internally retent water.  Presence of oxygen: Very few saprotrophic organisms can endure anaerobic conditions as evidenced by their growth above media such as water or soil.
  7. 7. Contd..  Neutral-acidic pH: The condition of neutral or mildly acidic conditions under pH 7 are required.  Low-medium temperature: The majority of saprotrophic organisms require temperatures between 1 °C and 35 °C, with optimum growth occurring at 25 °C.
  8. 8. CHARACTERISTICS  Plants that use the saprotrophic mode of nutrition are calledsaprotrophs. Plants get nitrogen from the soil by a mechanism of symbiosis.  A bacterium called rhozobium plays an important role in symbiotic nitrogen fixation.  This type of nitrogen fixation is observed in plants like peas, moong beans and other legumes.  By this process, both bacteria and plants get benefited mutually.

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