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Solute transport by translocation from source to sink - theory: - Solutes loaded into sieve tubes from companion cells by active transport, lowers water potential so water enters tubes by osmosis, creates high pressure -At sink end solutes removed from phloem and used up, increases water potential inside sieve tubes so water leaves tubes by osmosis lowering pressure- Pressure gradient from source to sink pushes solutes down sieve tubes to sink and are used up by companion cells/other cells in respiration/changed into starch
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