BIO120H1 Lecture Notes - Lecture 15: Crassulacean Acid Metabolism, Ecophysiology, Photorespiration
13 Nov 2018
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November 12, 2018 (relevant reading part 5, struggle for existence; simutext chapter: Physiological ecology, section 1; excerpt from lab girl, hope jahren) Plants can"t evade stress by moving; but can make their own food. Photosynthesis requires light, co2, and water; also requires reasonable temperature. Leaf, stem and root traits reflect adaptation to their environments. Physiological ecology is different for plants because they are: Sessile, with little scope for behavior; animals can escape adverse conditions, but plants must tolerate them. Autotrophic; they make their own food through photosynthesis. All plants need the same few things to grow: light, co2, water, and soil nutrients (especially nitrogen, phosphorus, and potassium, or npk) Plants must bring together co2, water, and light in functioning photosynthetic tissues. For growth, plants have to acquire more carbon through photosynthesis than they lose through respiration; carbon balance is therefore key. Photosynthetic (green) structures are usually leaves (but can be stems)
