ROOTS
Secondary Growth Phloem
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
