BIOL 205 Lecture Notes - Lecture 11: Symporter, Nitrite Reductase, Glutamine
Document Summary
Nutrients for plants: most nutrients exist in the form of ions in soil. Anions are dissolved in solutions: their abundance is affected by soil ph, minerals in nature are highly oxidized. Assimilation of nutrients is a reduction process: any nutrient can become toxic if exceeding a certain range. Intake of nutrients by plant cells is against concentration gradient, and therefore needs energy. Ions are transported into the cells through ion channels and carrier proteins. Essential elements: essential for completion of life cycle, lack of this element cause specific deficiency symptoms. The symptoms can be used for diagnostic purpose. When the element is mobile in the plant, symptoms are usually seen in the older leaves first. If the element is immobile, symptoms are systemic: not replaceable. Non-mineral elements: c, h, and o, backbone for all organic compounds, fixated from water and atmospheric co2 through photosynthesis, most abundant. N, k, ca, mg, p, s, si.
