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United States (324,891)
Biology (246)
BIO 123 (28)
Lecture

Photosynthesis Part 1

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Department
Biology
Course
BIO 123
Professor
Jason Wiles
Semester
Spring

Description
Photosynthesis 01/15/2014 Sugar Translocation Dissolved sugar is translocated upward or downward in phloem From area of excess sugar (usually a leaf) To a sink (area of storage or sugar use: roots, apical meristems, fruits, seeds) Sucrose is the predominant sugar translocated in phloem Pressure­Flow Hypothesis Explains movement of materials in phloem Companion cells actively load sugar into sieve tubes at source Requires ATP Sugar accumulates in sieve tube element Causing movement of water into sieve tubes by osmosis Companion cells unlo
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