3 резултати
Sucrose is loaded into the phloem in the minor veins of leaves before export. Two active, species-specific loading mechanisms have been proposed. One involves transporter-mediated sucrose transfer from the apoplast into the sieve element-companion cell complex, so-called apoplastic loading. In the
Phloem loading is the initial step in photoassimilate export and the one that creates the driving force for mass flow. It has been proposed that loading occurs symplastically in species that translocate carbohydrate primarily as raffinose family oligosaccharides (RFOs). In these plants, dense fields
Plants load sugars from photosynthesizing leaves into the phloem of exporting veins either "apoplastically" (by using H+/sucrose symporters) or "symplastically" (through plasmodesmata). The ability to regulate photosynthesis in response to the light environment was compared among apoplastic loaders