Sources - Photosynthesizing leaves, storage organs, Sinks - Roots and storage organs, Sucrose - The main form in which sugar is transported around the plant, A proton gradient - Formed by the active pumping of H+ across the companion cell, ATP - Required for active processes, Plasmodesmata - Channels connecting plant cells, Sieve plates - Connect cells in the phloem vessel, Mitochondria - Companion cells require these organelles for energy release, Assimilates - The collective term for substances transport by the phloem, Mass flow - The term for the movement of assimilates through the phloem, Phloem loading - Moving assimilates into the phloem vessel,

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