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.