Catabolism (Resp.) Anabolism (Pn) - PowerPoint PPT Presentation

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Catabolism (Resp.) Anabolism (Pn)

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  1. Mineral Nutrition METABOLISM Catabolism (Resp.) Anabolism (Pn)

  2. Mineral Nutrition Blue violet blue green violet yellow Orange red 400 500 600 700 (nm) PHOTOSYNTHESIS (Pn) radio Ultra- violet Cosmic ray • - ray x - ray Infrared 0.01 0.1 1 10 100 1,000 10,000 100,000 Wavelength(nm) CO2 , H2O absorb Infrared O3 absorb Ultraviolet Visible lt (400-700)

  3. Mineral Nutrition DATA ON SOLAR RADIATION Cal. Min. cm-2 1. Solar energy reaching the earth 1.9 2. Average energy penetrate to surface 0.76 3. Fraction useful for Pn 0.38 4. Lose by : - refracted - transmitted - absorbed - emitted - scattered

  4. Mineral Nutrition Average Illumination on earth surface = 2 x 109 Kcal/A/Yr(360 d. 6 hr) - 120 Kcal/30 g OM 100% conversion = 500 m.t/A/Yr - max efficiency of Pn = 30% = 150 m.t/A/Yr - average efficiency of Pn = 10% = 50 m.t/A/Yr - C4 plant = 40 m.t/A/Yr - average yield of intensive agriculture = 2 m.t/A/Yr

  5. Mineral Nutrition Ferredoxin Cyt.b Cyt.f PQ Chl.aChl.b Pn Light rx (Hill rx , Elect. Transport Chain) Dark rx (Calvin cycle, Hatch - Slack cycle) C3- , C4- , CAM Plant RuBP , PEP

  6. Mineral Nutrition Factors affecting Pn 1. Light (Quality, Quantity, Duration) 2. CO2 3. O2 4. Temperature 5. RH/Water 6. Mineral element 7. Chl. content, leaf age

  7. Mineral Nutrition • RESPIRATION (Oxidative Phosphorelation) • Dark respiration • Photorespiration • Factors : [O2] , Stress Condition