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- Q1283196 subject Q7157153.
- Q1283196 subject Q8765136.
- Q1283196 abstract "Root pressure is osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day. When transpiration is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull. At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves. Root pressure is studied by removing the shoot of a plant near the soil level. Xylem sap will exude from the cut stem for hours or days due to root pressure. If a pressure gauge is attached to the cut stem, the root pressure can be measured.Root pressure is caused by active distribution of mineral nutrient ions into the root xylem. Without transpiration to carry the ions up the stem, they accumulate in the root xylem and lower the water potential. Water then diffuses from the soil into the root xylem due to osmosis. Root pressure is caused by this accumulation of water in the xylem pushing on the rigid cells. Root pressure provides a force, which pushes water up the stem, but it is not enough to account for the movement of water to leaves at the top of the tallest trees. The maximum root pressure measured in some plants can raise water only to about 7 meters, and the tallest trees are over 100 meters tall.".
- Q1283196 thumbnail Primary_and_secondary_cotton_roots.jpg?width=300.
- Q1283196 wikiPageExternalLink the_mystery_of_maple_sap_flow.html.
- Q1283196 wikiPageExternalLink mapleimage036a.
- Q1283196 wikiPageWikiLink Q1048141.
- Q1283196 wikiPageWikiLink Q10884.
- Q1283196 wikiPageWikiLink Q1134046.
- Q1283196 wikiPageWikiLink Q122811.
- Q1283196 wikiPageWikiLink Q1293511.
- Q1283196 wikiPageWikiLink Q1295298.
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- Q1283196 wikiPageWikiLink Q134267.
- Q1283196 wikiPageWikiLink Q167980.
- Q1283196 wikiPageWikiLink Q214733.
- Q1283196 wikiPageWikiLink Q2567471.
- Q1283196 wikiPageWikiLink Q27133.
- Q1283196 wikiPageWikiLink Q304618.
- Q1283196 wikiPageWikiLink Q378041.
- Q1283196 wikiPageWikiLink Q41500.
- Q1283196 wikiPageWikiLink Q421955.
- Q1283196 wikiPageWikiLink Q42292.
- Q1283196 wikiPageWikiLink Q44395.
- Q1283196 wikiPageWikiLink Q473195.
- Q1283196 wikiPageWikiLink Q54237.
- Q1283196 wikiPageWikiLink Q623379.
- Q1283196 wikiPageWikiLink Q7157153.
- Q1283196 wikiPageWikiLink Q8765136.
- Q1283196 comment "Root pressure is osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day. When transpiration is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull.".
- Q1283196 label "Root pressure".
- Q1283196 depiction Primary_and_secondary_cotton_roots.jpg.