Quiz 6 Botany
Quiz 6 Botany PLSC101010
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This 3 page Study Guide was uploaded by Sophie Menos on Friday October 7, 2016. The Study Guide belongs to PLSC101010 at University of Delaware taught by Bais,Harsh in Fall 2016. Since its upload, it has received 40 views. For similar materials see Botany I in Plant Science at University of Delaware.
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Date Created: 10/07/16
Quiz 6 10/7/16 Phloem Transport • highly specialized process for transporting o photosynthates o other organic compounds § metabolites § hormones • source – sink translocation o source § any exporting region that produces photosynthate above and beyond that of its own needs § ex mature leaves o sink § any non-photosynthetic organ or an organ that does not produce enough photosynthate to meet its own needs § ex immature leaves, tubers, roots, fruits • fates of G3P o conversion to starch in chloroplast o export to cytosol as trioseP o conversion to sucrose in cytosol o can accumulate in vacuole o can be transported to other tissues • Phloem structure o main components § sieve elements ú no nucleus and a sparse collection of other organelles § companion cells ú provides energy • Pathway o sugars and other organic materials are conducted throughout the plant in the phloem by means of sieve elements o sieve elements display a variety of structural adaptations that make them well suited for transport • Patterns o materials are translocation in phloem from sources (mature leaves) to sinks (roots, immature leaves) • Materials o translocated solutes are mainly carbs o sucrose is most common translocated sugar o amino acids, proteins, inorganic ions, plant hormones • Rate Quiz 6 10/7/16 o movement in phloem is rapid o average 1 meter/ hour Essential Elements • plants are photo-autotrophic o they use light energy to build inorganic minerals into organic compounds o they need inorganic nutrients • nutrients o macronutrients § H O N C § non-mineral ú C H O § primary ú N P K § secondary ú C Mn S o micronutrients § Fe Cu Zn B Mo Mn Cl • critical concentration o plant tissue concentration of an element just below the level that gives maximum growth • deficient concentration o tissue concentration below critical concentration • adequate concentration o tissue concentration above critical concentration o growth does not increase any more even if concentration increases • mineral uptake from soil is influenced by soil tupe and environmental conditions • iron uptake o Strategy I (most plants) § phenolic compound secreted by root § binds Fe3+ , brings it to root surface § Fe-reductase in membrane reduced Fe3+ to Fe2+ § released by phenolic compound § taken up by membrane carrier o Strategy II (grasses) § phytosoiderophores (PS) secreted by root § bind Fe3+ bring it to root surface § entire complex is taken up § after uptake: Fe3+ reduced to Fe2+ Quiz 6 10/7/16 § released from PS § differences between the two = the entire complex is taken up and iron is reduced after uptake then released • passive transport o requires no energy o high concentration – low concentration o ex diffusion § through bilayer (not specific) § through channel (not specific) § via carrier (specific) § via membrane: facilitated diffusion • active o requires energy (ATP) o can go against concentration gradient o always involves membrane protein o molecules umped across membrane against concentration gradient
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