How are assimilates loaded into the phloem
Web8 de dez. de 2013 · Transport in plants 7 translocation of assimilates 1. Exchange and Transport Translocation We are learning to… Describe the mechanism of transport in phloem involving active loading at the source and removal at the sink, and the evidence for and against this mechanism Explain translocation as an energy-requiring process … Web8 de out. de 2013 · Along the phloem pathway, three successive functional sections can be defined, each with a specific task (Van Bel and Hafke, 2005): collection, transport, and release . In the collection phloem, assimilates are loaded into the sieve element–companion cell complex (SECCC) of the minor leaf veins after being produced …
How are assimilates loaded into the phloem
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Web1 de jan. de 1989 · PDF On Jan 1, 1989, S Delrot and others published Phloem loading and unloading Find, read and cite all the research you need on ResearchGate WebLoading of assimilates (eg. sucrose) The pathway that sucrose molecules use to travel to the sieve tubes is not fully understood yet. The molecules may move by the: symplastic pathway (through the cytoplasm and …
WebPhotoassimilates are translocated via the phloem through essentially leaky instead of hermetically sealed pipes (sieve tubes). The solute content, and implicitly the turgor, are controlled by release/retrieval systems located on the plasma membrane of the sieve element/companion cell complexes (SE/CC complexes). WebAssimilates synthesized in the mesophyll of mature leaves move along the pre-phloem transport pathway to the bundle sheath of the minor veins from which they are loaded into the phloem. The present review discusses the most probable driving force(s) for the pre-phloem pathway, diffusion down the con …
Web1 de dez. de 2024 · The products of photosynthesis (mainly the sugar sucrose) are a major component of the substance found in the phloem, called assimilate. Ions, amino acids, certain hormones, and other molecules are also found in assimilate. The movement of … Webloaded into the companion cells and sieve elements for transport. However, there are reasons to doubt that this is the major pathway (Lucas, 1985). The kinetics of sugar uptake by leaf discs, petiole and hypocotyl tissue of various species has been frequently studied but its relevance to phloem loading is uncertain.
WebFruit trees grow in complex environments where various environmental factors are related to each other, exerting a comprehensive effect on fruit quality. In this study, diurnal variations in environmental indices in the field and greenhouse were recorded, and the changes of leaf photosynthetic assimilate metabolism and fruit soluble sugar accumulation in peach …
WebA multitude of genes encoding transporters that can potentially load amino acids, ureides and short peptides into the phloem from the apoplasm have been uncovered in plant … crystal higgins facebookWebThe most commonly accepted hypothesis to explain the movement of sugars in phloem is the pressure flow model for phloem transport. This hypothesis accounts for several … d what are two groups found on the review tabWebThe phloem can be considered a highway that links parts of the plant that require nutrients to other parts of the plant that have a surplus of the nutrients. This is where the terms sources and sinks come in. Sources- areas where sugars and amino acids are loaded into the phloem for transport d. what are the ways of writing a function