Week 7, Lecture 3, Plant Nutrition

Week 7, Lecture 3, Plant Nutrition - Macronutrients BIOLOGY...

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B I O L O G Y 1 2 2 3 Plant Nutrition Autotrophic does not mean autonomous B I O L O G Y 1 2 2 3 Needs Sun as energy source Inorganic materials as building materials – Water – CO 2 – minerals Fig. 41.3 Plant thrives; test element may not be essential b. Procedure for identifying elements essential for proper plant nutrition Lettuce plant growing in complete nutrient solution or Transplantation Plant grows abnormally; test element is essential Solution lacking one element B I O L O G Y 1 2 2 3 Macronutrients Needed in large amounts – C arbon – O xygen – H ydrogen – N itrogen – P hosphorus – K potassium – C alcium – Mg Magnesium – S ulphur Macronutrients 41.1 B I O L O G Y 1 2 2 3 Micronutrients Needed in very small amounts – Co-factors
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Micronutrients See Table 41.1 Mineral Deficiencies Fig. 41.4 B I O L O G Y 1 2 2 3 Obtaining and Absorbing Nutrients Root systems allow plants to locate and absorb essential nutrients Nutrients move into and through the plant body by several routes Plants depend on bacterial metabolism to provide them with usable nitrogen Some plants obtain scarce nutrients in other ways B I O L O G Y 1 2 2 3 Root Systems Extensive root systems are adaptations to limited mineral nutrients – May be more than half of total plant mass – Roots grow as long as plant lives Roots have mechanisms to increase uptake – Root hairs – Membrane transporters – Mycorrhizae symbiotic with fungi B I O L O G Y 1 2 2 3 15-Feb-10 Gardiner 11 B I O L O G Y 1 2 2 3 Nutrient Movement Nutrients taken up actively, or passively via transpiration – Apoplastic (xylem) or symplastic
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