CC, companion cell; FA, floral anlagen; FP, floral primordium; LP, leaf primordium; SAM, shoot apical meristem; SE, sieve element. Full size image NaKR1 was previously reported to function as a ...

7. Companion cells are present in all families of the woody dicotyledons studied, although usually in smaller numbers than in the phylogenetically higher forms. 8. The sieve tubes of the lower woody ...

Companion cells, adjacent to the sieve tubes provide energy required to transport substances in the phloem. Phloem. Learn more about specialised animal and plant cells with Dr Alex Lathbridge.