Respuesta :
The Answer is (D). viruses, sugars, and mRNA
Cell to cell transport by plasmodesmata occurs along the simplistic (alive) route to the vascular stele.
- Plasmodesmata are plasma membrane-lined tubes of cytoplasm that cross cell walls.
- Herbicides can travel down these channels rather than through the cell wall from one cell to the next.
- All viral movement takes place within the plant symplast, with the exception of the poorly understood process of virus transfer in the xylem. Therefore, if long-distance transport via the phloem is to occur, this simplistic barrier to solute transportation must be removed for phloem loading of viruses in species that load assimilate apo plastically, such as tobacco (Nicotiana tabacum).
- Ultrastructural studies have revealed numerous plasmodesmata connecting CCs to nearby bundle sheath and parenchyma cells in both N. tabacum and the closely related Nicotiana benthamiana11,12. This suggests a solution to the apparent paradox of the different pathways taken by small solutes and viruses into the phloem.
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