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Lecture 19

LIFE 121 Lecture Notes - Lecture 19: Plasmolysis, Tracheid, Water Potential

3 pages100 viewsSpring 2018

Department
Life Sciences
Course Code
LIFE 121
Professor
Roberto Cortinas
Lecture
19

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Plant Transport
Plant Acquisition of Resources
o Success depends on ability to gather and conserve resources from
environment
o Trasport of aterials is ritial to a plat’s itegrated futioig
Transport of Substances
o Plants have developed mechanisms for transporting substances over short
or long distances
o Why was the development of vascular tissue critical?
Allows extensive root and shoot systems
Provides long-distance transport
Resulting in competition for light, water, nutrients
Transport in Vascular Tissue
o Xylem
transports water and minerals from roots and shoots
o Phloem
Transports photosynthetic products form where they are made or
stored (sources) to where they are required (sinks)
Transport of Substances
o Adaptations in each species represent compromises between enhancing
photosynthesis and minimizing water loss
Transport Pathways
o Two principal compartments of plant tissue
Apoplast
Consist of everything external to plasma membrane
Cell walls, extracellular spaces, and the interior of
vessel elements and tracheas
Symplast
Consists of the cytosol of the living cells as well as the
plasmodesmata
Plasmodesma (singular)- a microscopic channel that
crosses the cell walls of plant cells allowing transport
and communication between them
o Three possible transport routes for water and solutes
Apoplectic route
Through cell walls and extracellular spaces
Symplastic route
Through the cytosol
Transmembrans route
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