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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The part of the primary xylem that differentiates after the protoxylem and is characterized by broader vessels and tracheids.


Sorry, no etymologies found.


  • Using a combination of molecular and cellular techniques including high-resolution imaging, they discovered a complex sequence of events at the molecular level that creates the distinction between protoxylem and metaxylem cells.


  • High dosage of these messenger RNA molecules lead cells to become metaxylem, whereas low dosage leads to protoxylem.


  • In areas where there are lower levels of microRNA 165/6, cells turn into metaxylem.


  • The researchers conducted the study in the root of Arabidopsis, a small flowering plant related to cabbage, where they took a closer look at the development of two types of root cells - protoxylem and metaxylem.



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