Phloem
Sugar transport tissue in vascular plants / From Wikipedia, the free encyclopedia
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Phloem (/ˈfloʊ.əm/, FLOH-əm) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose,[1] to the rest of the plant. This transport process is called translocation.[2] In trees, the phloem is the innermost layer of the bark, hence the name, derived from the Ancient Greek word φλοιός (phloiós), meaning "bark".[3][4] The term was introduced by Carl Nägeli in 1858.[5][6] Different types of phloem can be distinguished. The early phloem formed in the growth apices is called protophloem. Protophloem eventually becomes obliterated once it connects to the durable phloem in mature organs, the metaphloem.[7][8] Further, secondary phloem is formed during the thickening of stem structures.[9]