chapter2_fullsize

chapter2_fullsize - Plant physiology

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Section I: Water and inorganic nutrients Plant nutrition Section II: Carbon
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Plant nutrition Plant 70-95% water 5-30% dry matter 96% H, O, N, C macronutrients P, K, S, Mg, Ca micronutrients Fe, Zn, Mn, Cl, B, Cu, Ni, Mo
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Plants need water as source of H and O as solvent for other molecules/ions for support
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Chapter 2: Plant cells and water Water Chapter 3: Water relations of the whole plant
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Water: suitable medium for life • mostly liquid ( 0-100 o C) • floats if solid • good solvent • resists change in temp. Reason: • water is polar • water forms H-bonds
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• mostly liquid ( 0-100 o C) • floats if solid • good solvent • resists change in temp. • water is polar • water forms H-bonds • water molecules cling to each other ( cohesion ) and to polar surfaces ( adhesion )
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Water movement in plants passive process driven by diffusion driven by pressure osmosis bulk flow water movement over membrane, short distance often not over membrane, can be long-distance : requires no energy
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Water movement over membranes - through phospholipid bilayer - through special water channels: aquaporins (regulated)
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always from high ! low conc. Different molecules
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chapter2_fullsize - Plant physiology

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