Chapter 36

Chapter 36 - Chapter 36 Plant Nutrition Nutrition Most from...

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Chapter 36 Plant Nutrition Nutrition Most from soil (minerals), water (hydrogen and oxygen), or air (carbon dioxide and oxygen) Nitrogen and phosphorous limiting (plant growth is limited by the supply of these nutrients) Acquisition of soil nutrients (minerals) o Plants concentrate minerals inside their tissues. High concentration inside the plant and low concentration of the outside plant. High to low: diffusion. Low to High- active transport; ATP is required o Minerals kept in vascular cylinder of the root o Plasmodesmata- pores that exist between adjacent cells to move from one to the other. Can go in between the cells or through them o Symbionts help get nutrients. Fungi and root nodules Mycorrhizzae (fungus)- mutualistic symbiont relationship. Plants are being fertilized through this relationship Nitrogen-fixing bacteria help plant absorb nitrogen (ammonium or nitate ions) Plant supplies the bacteria with sugar for energy, bacteria produce excess ammonium or nitrate for the plant Acquisition of water o Xylem moves in one direction from the roots up o Osmosis- movement of water across a semi permeable membrane; high concentration of water to low concentration of water (in terms of pressures: high pressure to low pressure)
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This note was uploaded on 02/05/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 36 - Chapter 36 Plant Nutrition Nutrition Most from...

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