Phloem

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Cross-section o a flax plant stem:
1. Pith,
2. Protoxylem,
3. Xylem I,
4. Phloem I,
5. Sclerenchyma (bast fibre),
6. Cortex,
7. Epidermis

In vascular plants, phloem is the livin tissue that carries organic nutrients (kent as photosynthate), in particular, sucrose,[1] a succar, tae aw pairts o the plant whaur needit. In trees, the phloem is the innermaist layer o the bark, hence the name, derived frae the Greek wird φλοιός (phloios) meanin "bark". The phloem is concerned mainly wi the transport o soluble organic material made during photosynthesis. This is cried translocation.

References[eedit | eedit soorce]

  1. Lalonde S. Wipf D., Frommer W.B. (2004). "Transport mechanisms for organic forms of carbon and nitrogen between source and sink". Annu Rev Plant Biol. 55: 341–72. doi:10.1146/annurev.arplant.55.031903.141758. PMID 15377224.