Definition noun (botany) any type of of the metabolically-active parenchyma cells associated with a sieve tube aspect in the phloem organization of angiosperms, and whose function is to administer energy come the sieve tube element during translocation Supplement The phloem is the vascular organization that carries out the duty of translocation (i.e. The procedure of carrying photosynthate products from the photosynthetic plant organs to assorted parts of the plant). The phloem is consisted of of the following significant components: (1) sieve element, (2) companion cell, (3) phloem sclerenchyma, and also (4) phloem parenchyma. The companion cells are specialized parenchyma cell in the phloem tissues of the angiosperms. They room nucleated living cell with several ribosomes, plastids, and also mitochondria. Your nuclei and also nucleoli space relatively big (an indication of being metabolically active). They room closely linked with the sieve pipe elements. They connect to them via the plasmodesmata. They administer energy come the sieve elements during food transport (translocation). A companion cell and also the connected sieve facet have one ontogenic relationship, which method that they developed from a common progenitor cell. The companion cabinet though is smaller and narrower 보다 the sieve pipe element. There space two types of companion cells: the simple companion cells and also the transport cells. The move cells differ from the simple companion cell in having plasma membrane infoldings, which increase the surface area that permit larger locations of transfer. Companion cells are current only in angiosperms. Pteridophytes and gymnosperms carry out not have actually companion cell although several of them have actually a cell v similar duty (called albuminous cell) that is closely linked with the sieve cell. However, over there is no ontogenic relationship between an albuminous cell and the sieve cell. See also:


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tree Tissues

Plant organs are comprised of tissues working together for a usual function. The different types of tree tissues are meristematic, simple, secretory, and complicated tissues. Find out the distinctive characteristics of each tissue in regards to structure and also function...

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Seed tree

Seed plants room vascular plants. They differ from the various other vascular tree in developing seeds that germinate right into a new plant. Two major plant divisions are covered: the angiosperms and also the gymnosperms. ..

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trunk

Stems primarily provide plants structure support. This tutorial contains lectures top top the external type of a woody twig and the beginning and breakthrough of stems. Also included are the various modified trunk that bring out special functions. ..

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