ECON 2010 Lecture 4: Section 4: Plant Nutrition
3 Apr 2016
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Document Summary
Nutrient substance metabolized by or incorporated into an organism. Deficiency symptoms develop in plants that receive too little of these substances. Scarcity of nutrients selects for adaptations that help in acquisition (ex. carnivorous plants) Essential elements chemical elements needed by plants that play many roles in metabolism often act as enzyme cofactors. Macronutrients required in amounts of at least 1g/kg of plant dry matter (c,o,h,n,k,ca,mg,p,s) Micronutrients or trace elements required in amounts at or less than 0. 1g/kg (e. g. , Limiting factors light, carbon dioxide, water, and other mineral nutrients can limit growth. Produce thin, translucent leaves that allow some light to pass through to other leaves. Produce distinctive sun and shade leaves shade leaves have thinner mesophyll with more air spaces. Epidermal cells shaped like lenses to focus light. Too much light can damage the chloroplasts destroying a specific protein used in photosynthesis. Specific xanthophyll pigments in chloroplast absorb some light energy and dissipate it as (harmless) heat.
