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Phloem Lecture 3
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pressure flow hypothesis for transport through the sieve tube
100 cm/hr is too fast for diffusion
driving force for bulk flow is the hydrostatic pressure gradient
gradient maintained by phloem loading at the source and phloem unloading at the sink
sieve plates create a resistance
evidence for pressure flow hypothesis
demonstration of adequate pressure gradients
demonstration of open sieve plate pores - rapid freezing and fixation
demonstration of bulk flow particle movement - viruses
mathematical modeling supports bulk flow through the sieve tube
phloem unloading
sieve tube unloading
short distance transport
storage and metabolism in receiver cell
symplastic unloading
young leaves
sugar beet
tobacco
primary root tips
apoplastic unloading
in developing leaves of monocots - few plasmodesmata
cell wall invertase
sucrose -> gluctose + fructose
sugar-H+ symporter
active membrane transport into receiver cells
sucrose-proton antiporter - sugar is transported to the vacuoles
vacuolar H+ ATPase pumps protons into vacuole
Author
cornpops
ID
120227
Card Set
Phloem Lecture 3
Description
plant physiology and biochemistry exam 6
Updated
2011-12-02T06:25:28Z
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