CBP PP5 Plant Nitrogen

CBP PP5 Plant Nitrogen - CBP PP5 Plant Nitrogen

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LR/CC/CBP Nitrogen Major limiting nutrient From decomposition of organic matter Or by fixation of atmospheric nitrogen
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LR/CC/CBP Nitrogen Cycle Nitrogen fixation L Air N 2 converted to NH 4 by Nitrogenase L In soil nitrogen-fixing bacteria Nitrification L 2NH 4 + + 3O 2 → 2NO 2 - + 4H + + 2H 2 O L Nitrifying bacteria, Nitrosomonas Nitrite toxic to plants L 2NO 2 - + O 2 → 2NO 3 - L rapidly converted to nitrate by Nitrobacter
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LR/CC/CBP Most plants take up nitrogen as nitrate Denitrification L Nitrate reduced to N 2 or nitrous oxide L Returns nitrogen to atmosphere L Due to denitrifying bacteria L Common in anaerobic nitrogen rich soils Ammonification L Decomposition of biomass L returns nitrogen to soil
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LR/CC/CBP
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LR/CC/CBP
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LR/CC/CBP Legumes Fix nitrogen by symbiotic bacteria in roots L Rhizobium or Bradyrhizobium, ( collectively referred to as Rhizobia) i Free living soil bacteria L Colonise roots of legume seedlings L Specific recognition by root hair receptors
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This note was uploaded on 07/04/2011 for the course BIO microbiolo taught by Professor Point during the Spring '09 term at HKU.

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CBP PP5 Plant Nitrogen - CBP PP5 Plant Nitrogen

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