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AEBI 210- Oct 19th.doc
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Department
Biology (Agric & Envir Sc)
Course
AEBI 210
Professor
Jaswinder Singh
Semester
Fall

Description
Organisms 1- AEBI-210 001 October 19th, 2012 Transporting Photosynthate Photosynthesis: Water, carbon dioxide and sunlight is taken in, oxygen and sugar is produced Transportation: Phloem transports photosynthate, some minerals, organic compounds A source produces more photosynthate then it needs (leaves) A sink is a non-photosynthetic organ which requires photosynthate (roots, shoots) Carbohydrates are often produced in leaves and stored in roots Carbohydrates formed by photosynthesis are moved from the chloroplast to cytosol At night, these are converted to sucrose in the mesophyll Sucrose is then loaded into sieve and companion cells (short distance transport) -Symplastic loading in some plants (primarily tropical ones) -Raffinose is synthesized and diffuses into phloem with sucrose -Apoplastic loading occurs primarily in temperate plants -Requires active transport into
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