primary thickening meristem


primary thickening meristem
  Diffuse primary meristem which decreases in cross-sectional extent (i.e. becomes a thinner-walled cylinder) in a basipetal direction (DeMason, 1983).

Expanded glossary of Cycad terms . 2014.

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  • angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction       any member of the more than 300,000 species of flowering plants (division Anthophyta) …   Universalium

  • Secondary growth — In many vascular plants, secondary growth is the result of the activity of the vascular cambium. The latter is a meristem that divides to produce secondary xylem cells on the inside of the meristem (the adaxial side) and secondary phloem cells on …   Wikipedia

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  • Cycadales —   Gymnosperm plant order containing all extant and extinct cycads; defined by the absence of axillary buds and the presence of cycasin, girdling leaf traces, simple megasporophylls, and primary thickening meristem which gives rise to the… …   Expanded glossary of Cycad terms

  • REFERENCES —   ■ Bonta, M., O. Flores Pinot, D. Graham, J. Haynes & G. Sandoval. 2006. Ethnobotany and conservation of tiusinte (Dioon mejiae Standl. & L.O. Williams, Zamiaceae) in northeastern Honduras. Journal of Ethnobiology 26:228 257.   ■ Cactus Art.… …   Expanded glossary of Cycad terms

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  • plant development — Introduction       a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… …   Universalium

  • tree — treelike, adj. /tree/, n., v., treed, treeing. n. 1. a plant having a permanently woody main stem or trunk, ordinarily growing to a considerable height, and usually developing branches at some distance from the ground. 2. any of various shrubs,… …   Universalium

  • Tree — /tree/, n. Sir Herbert Beerbohm /bear bohm/, (Herbert Beerbohm), 1853 1917, English actor and theater manager; brother of Max Beerbohm. * * * I Woody perennial plant. Most trees have a single self supporting trunk containing woody tissues, and in …   Universalium

  • Root — This article is about the part of a plant. For other uses, see Root (disambiguation). Primary and secondary roots in a cotton plant In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. This is… …   Wikipedia