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Lecture 19

LIFE 121 Lecture 19: Exam 2: Plant Transport

3 Pages
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Department
Life Sciences
Course Code
LIFE 121
Professor
Roberto Cortinas

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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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Description
Plant Transport Plant Acquisition of Resources o Success depends on ability to gather and conserve resources from environment o Transport of materials is critical to a plants integrated functioning 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 longdistance 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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