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There is Evidence Both For and Against Mass Flow

Supporting evidence

1. If you remove ring of bark (includes phloem, but not xylem) from woody stem a bulge forms
above ring
If you analyse the fluid from the bulge, you'll find it has a higher concentration of sugars than…

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EXAMPLE - In potatoes, sucrose converted to start in sink areas, so always lower concentration of
sucrose at sink than in phloem. Makes sure constant supply of new sucrose reaches sink from phloem

The Mass Flow Hypothesis Best Explains Phloem Transport

1. Active transport used to actively load dissolved…


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