Secondary Growth Phloem

Phloem tissue transports photosynthates in roots and shoots. In Vitis, secondary phloem tissue consists of sieve tube members, companion cells, parenchyma cells, and fiber cells.
In the image at left, four sieve tube members are shown connected end to end at compound sieve plates (to form a sieve tube) and side by side at sieve areas.
P-protein is also located inside sieve tube members. P-protein is indeed a protein, even though is was formerly termed "slime".


Root Maceration


Page 1 / Page 2 / Page 3 / Page 4

Roots Secondary Growth