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Distinguish between sources and sinks and provide examples of each. Explain the process of phloem loading, distinguishing between apoplastic and symplastic pathways. Explain how assimilate translocations through the phloem according to the pressure-flow hypothesis. Plants need an energy source to grow.
24 Σεπ 2024 · The cells are joined end to end and contain holes in the end cell walls (called sieve plates) which allow easy flow of substances from one cell to the next. The transport of sucrose and amino acids in the phloem, from regions of production to regions of storage or use, is called translocation.
Key learning points. Sugars, amino acids and other organic substances (nutrients) are transported in phloem. Translocation starts at a source, such as a leaf where sugars are made. Sugars are transported into phloem by active transport across the membranes of the living phloem cells.
2 Ιουν 2022 · Translocation of assimilates is not fully understood yet by scientists. The understanding they do have has come from studies such as: Collecting and studying the sap from plants with 'clotting' sap (eg. castor oil plants)
27 Αυγ 2022 · Translocation. (1) A change of location; displacement; a transfer of location. (2) (genetics) Chromosomal translocation, that is a chromosomal segment is moved from one position to another, either within the same chromosome or to another chromosome.
13 Μαρ 2021 · Translocation is the movement of solutes from source to sink through the phloem sieve tubes. Sucrose is actively loaded into companion cells using co-transport with H + ions. There is a pressure gradient from source to sink which drives mass flow.
Translocation refers to the transport of soluble organic compounds within a plant. This process occurs in the plant’s phloem tissue. These compounds are often referred to as assimilates or photosynthates. The main substance moved in this way is sucrose, a type of sugar. Process.
