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- Q7241705 subject Q7157153.
- Q7241705 abstract "The Pressure Flow Hypothesis, also known as the Mass Flow Hypothesis, is the best-supported theory to explain the movement of sap through the phloem. It was proposed by Ernst Munch, a German plant physiologist in 1930.A high concentration of organic substances, particularly sugar, inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient (osmotic gradient) that draws water into the cells from the adjacent xylem. This creates turgor pressure, also known as hydrostatic pressure, in the phloem. Movement of phloem sap occurs by bulk flow (mass flow) from sugar sources to sugar sinks. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward). Because of this multi-directional flow, coupled with the fact that sap cannot move with ease between adjacent sieve-tubes, it is not unusual for sap in adjacent sieve-tubes to be flowing in opposite directions.".
- Q7241705 wikiPageWikiLink Q11002.
- Q7241705 wikiPageWikiLink Q1134046.
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- Q7241705 wikiPageWikiLink Q54237.
- Q7241705 wikiPageWikiLink Q7157153.
- Q7241705 wikiPageWikiLink Q76626.
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- Q7241705 wikiPageWikiLink Q8066.
- Q7241705 wikiPageWikiLink Q844863.
- Q7241705 wikiPageWikiLink Q912751.
- Q7241705 comment "The Pressure Flow Hypothesis, also known as the Mass Flow Hypothesis, is the best-supported theory to explain the movement of sap through the phloem. It was proposed by Ernst Munch, a German plant physiologist in 1930.A high concentration of organic substances, particularly sugar, inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient (osmotic gradient) that draws water into the cells from the adjacent xylem.".
- Q7241705 label "Pressure Flow Hypothesis".