This card explains how water enters the xylem through the endodermis and the Casparian strip, and how it is osmotically drawn into the xylem due to lower water potential, creating root pressure.
Tato karta vysvětluje, jak se voda dostává do xylému přes endodermis a Casparianův pás, a jak je osmoticky tažena do xylému díky nižšímu vodnímu potenciálu, což vytváří kořenový tlak.
| Front | Water getting into xylem 3.1.3(d) |
|---|---|
| Back | - Water moves across root in apoplast/symplast pathways will endodermis (layer of cells surrounding vascular tissue of roots), Casparian strip is band of waxy material (Suberin) running around each endodermal cell forming waterproof layer - here, water in apoplast forced (as it can’t go further) into cytoplasm of cell (joining symplast), had to pass selectively permeable membrane to get there (excludes any toxic solutes in water from reaching tissue as.no carrier proteins) - WP of xylem cells lower than endodermal cells as solute conc higher and endodermal cells move mineral ions into xylem by AT, increasing rate of water moving into xylem by osmosis from endodermis via symplast pathway, once inside vascular bundle, water returns to apoplast to enter xylem itself, root pressure gives water a push up xylem |
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