Botany Lecture 3

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Botany Lecture 3
Plant Nutrition
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Plant Nutrition
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What do plants need for healthy growth?
9 Macronutrients
Micronutrients.
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Where do Plants get their nutrients?
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Nitrogen
Nitrogen shortage is the single most common
problem in plants, symptoms include
Nitrogen deficient plant
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Most plants depend on bacteria to supply nitrogen
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Symbiotic Nitrogen Fixation
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Phosphorus
A phosphorus deficient plant may have green leaves
Phosphorus deficient plant
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Potassium
Symptoms usually show up in older leaves first.
Potassium deficient plant
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Other Macro-Nutrients
Calcium
Magnesium
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Mycorrhizae
Most plants have mycorrhizae
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Some Plants are Parasitic
Dodder on Pickleweed
Mistletoe on an Oak
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Carnivorous Plants
Venus Fly Trap
Round leafed Sundew
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Improving Protein Content
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Genetic Engineering
There are two main techniques used
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Products of Plant Biotechnology
Delayed ripening tomatoes Herbicide resistant
canola, soybeans, cotton, and other crops Insect
resistant corn, potatoes, and other crops Golden
Rice (vitamin A and beta-carotene enriched)
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Control Systems in Plants