Mar 12, 2023
Sieve elements (sieve cells and sieve tube elements) have characteristic sieve areas in their cell walls, where pores interconnect the conducting cells (Figure 11.5). (...) A longer-term solution to sieve tube damage is the production of the glucose polymer callose in the sieve pores (see Figure 11.5D).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.