BIOL1002 Lecture Notes - Lecture 3: Dicotyledon, Monocotyledon, Endosperm

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Phloem unloading may also require atp and other membrane transport mechanisms. The membrane proteins involved and mechanism of movement vary among different types of sinks within the same plant, as well as among different species. Unloading is important for pressure in shoot and root systems. For example, in sugar beets, phloem unloading in young growing leaves occurs via passive transport. In the growing leaves unloading sucrose from phloem is driven by passive transport. concentration is lower in leaf cell than the companion cell. In roots which contain vacuole which stores sucrose there is no need to expend energy, going against electrochemical gradient which is why atp is required. Movement of sucrose into root cells drives water through the phloem maintaining pressure potential. Angiosperms are arguably the most successful group of plants on the planet. 250,000 species of angiosperms are so far described, with some estimates suggest more than 350,000 species exist. Angiosperms first appeared in the fossil record during the.

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