Bio - Chapter 36

Bio - Chapter 36 - Chapter 36 Plant Nutrition 36.1 How Do...

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Chapter 36 – Plant Nutrition 36.1 How Do plants acquire nutrients? o Nutrients = carbon, hydrogen, oxygen, and nitrogen o Lesser nutrients = sulfur, phosphorus magnesium, iron o Autotrophs – organisms that make their own organic compounds from simple inorganic nutrients Photosynthesizers – energy from light Chemolithotrophs – energy from reduced inorganic substances o Heterotrophs require pre-formed organic compounds as food How does a stationary organism find nutrients? o Sessile – clams, barnacles obtain nutrients and energy when food is brought to them 36.2 What mineral nutrients do plants require? o Essential Elements (2) Macronutrients – in concentrations of at least 1 per kilogram of their dry matter Nitrogen N– in proteins, nucleic acids Phosphorus P– in nucleic acids, ATP, phospholipids Potassium K– enzyme activation, water balance, ion balance, stomata opening Sulfur S – in proteins and coenzymes Calcium Ca – affects the cytoskeleton, membranes, enzymes, 2 nd messenger Magnesium Mg – in chlorophyll, required by enzymes, stabilized ribosomes Micronutrients – in concentrations of less than 100 milligrams per kilogram of their dry matter Iron Fe – in active site of redox enzymes & electron carriers, chlorophyll synthesis Chlorine Cl – Photosynthesis, ion balance Manganese Mn – activation of many enzymes
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Boron B – possibly carbohydrate transport Zinc Zn – enzyme activation, auxin synthesis Copper Cu – in active site of many redox enzymes and electron carriers Nickel Ni – activation of one enzyme Molybdenum Mo – nitrate reduction Deficiency symptoms reveal inadequate nutrition o Deficiency symptoms – before a plant that is deficient in an essential element dies, it usually displays certain characteristics (discoloration of deformation of leaves) o Fertilizer – an added source of mineral nutrients o Nitrogen deficiency is the most common mineral deficiency Yellowing of older leaves/ die / plant is stunted Chlorophyll contains nitrogen - without nigrogen there is no chlorophyll, the yellow carotenoid pigments in the leaves become visible o Iron deficiency can causw yellowing because iron, although it is not contained in the chlorophyll molecules, is required for chlorophyll syntehesis Yellowing of youngest leaves Several essential elements fulfill multiple roles o Magnesium - it’s a constituent of the chlorophyll molecule and hence is essential to
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This note was uploaded on 04/17/2008 for the course BIO 1305 taught by Professor Eldridge during the Spring '08 term at Baylor.

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Bio - Chapter 36 - Chapter 36 Plant Nutrition 36.1 How Do...

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