bis ic lec 10

bis ic lec 10 - Lecture: 10 BioSci 1C Apr. 12.07 Phloem and...

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Lecture: 10 BioSci 1C Apr. 12.07 Phloem and Translocation
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PHLOEM: Basic Aspects to be Addressed: Phloem structure Substances being translocated Mechanism of Translocation Direction & Rate of Flow – Controls?
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Phloem Loading
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Routes for Sucrose Loading
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Phloem transport is driven by an osmotically generated pressure flow Why transport in phloem CANNOT be explained by diffusion followed by cytoplasmic streaming?
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Phloem transport is driven by an osmotically generated pressure flow Why transport in phloem CANNOT be explained by diffusion followed by cytoplasmic streaming? Velocity of assimilates (~50-100 cm/h) are too great for either phenomena to account for long distance transport via sieve tubes. Because:
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Phloem transport is driven by an osmotically generated pressure flow Ernst Münch (1927) proposed: Pressure Flow Hypothesis Pressure flow hypothesis: Assimilates are transported from source to sink along a turgor pressure gradient developed osmotically.
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Sources : Area of supply or exporters of assimilates. Sources are Photosynthesizing leaves and also storage
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bis ic lec 10 - Lecture: 10 BioSci 1C Apr. 12.07 Phloem and...

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