BSC 116 Lecture Notes - Lecture 12: Venus Flytrap, Cuscuta, Haustorium
27 Aug 2016
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Soil = dirt (but really far more complex) Particles are classified by size = from largest to smallest they are called sand, silt and clay. Cations adhere to negatively charged soil particles; this prevents them from leaching out of the soil through percolating groundwater. 17 essential nutrients: required to complete life cycle. 9 macronutrients: need in large amounts: carbon, oxygen, hydrogen, nitrogen, phosphorus, sulfur, potassium, calcium, magnesium. 8 micronutrients: need in trace amounts (cl, fe zn, etc. : all < 0. 01% of the plant"s dry mass, all cofactors needed for specific enzymes. Some plant species gain water and nutrients in other ways. Epiphytes: grow on other plants; absorb rainwater, etc: e. g. , some orchids, bromeliads, live in hot and humid environments. Parasitic plants: many with roots that function as haustoria (similar to arbusuclar mycorrhizae), roots grow down and into cells of host plants: e. g. , dodder, mistletoe.
