Botany Quiz 5 guide
Botany Quiz 5 guide PLSC101010
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This 4 page Study Guide was uploaded by Sophie Menos on Monday October 3, 2016. The Study Guide belongs to PLSC101010 at University of Delaware taught by Bais,Harsh in Fall 2016. Since its upload, it has received 86 views. For similar materials see Botany I in Plant Science at University of Delaware.
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Date Created: 10/03/16
Exam Study Guide 10/3/16 3:57 PM Notes Transpiration • root – shoot transport o translocate water and nutrients from root to shoot o phloem vessels • shoot - root o translocation photosynthates from shoot to root o in xylem vessels • water always flows towards low water potential/high solute potential • soil properties influence water availability o porosity, water retention, aeration o sand – large particles, large pore space, low water retention, high aeration o clay – small particles, low porosity, high water retention, low aeration o silt – in between size o loam – mixture of sand, slit and clay o field capacity § soil after drainage ú low for sand ú high for clay o permanent wilting point § soil capacity so low plants cannot take up water § permanent wilting percentage ú soil water content at this point § available water = field capacity – permanent wilting % ú high in loam soils, low in sand o transpiration § uptake in root symplast ú passes through membrane ú solute-driven osmosis § export into root xylem apoplast ú passes a membrane ú pressure driven osmosis § bulk flow to shoot ú no membrane ú bulk flow (not osmosis) § uptake in shoot symplast ú passes membrane ú solute-driven osmosis § evaporation into air ú passes a membrane ú pressure-driven osmosis • driving forces of water movement o short distance – osmosis § into cells: solute driven § out of cells: pressure driven o long distance – bulk flow § suction created by leaf evap § cohesion/adhesion of water § root pressure • cavitation o high temperature conditions, air bubble is created, hindering transpiration • acclimation o metabolic changes morphological changes • adaptation o genetic 10/3/16 3:57 PM 10/3/16 3:57 PM
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