| 词条 | Root crown |
| 释义 |
A root crown, also known as the root collar or root neck, is that part of a root system from which a stem arises. Since roots and stems have quite different vascular anatomies, major vascular changes take place at this point. Root-crown temperature has been found to affect plant growth and physiology in a number of ways.[1] Root crowns need to be exposed and 'breathe'; this is one way that some plants take in oxygen. A number of pests and diseases affect specifically this part of the plant, including root-crown rot (or root-crown fungus)[2] and a number of species of root-crown weevil. The root crown area usually appears swollen, tapered, constricted or very thin - as well as a combination of these. The area of the root crown is usually located around or at the soil level and can be vaguely or clearly apparent.[3] References1. ^{{cite journal | author = Schwarz, Meier | year = 1972 | title = Influence of root crown temperature on plant development | journal = Plant and Soil | volume = 37 | issue = 2 | pages = 435–439 | doi = 10.1007/BF02139988}} {{botany-stub}}2. ^Root and Crown Rots. University of Wisconsin Garden Facts. 3. ^http://www.cactus-art.biz/note-book/Dictionary/Dictionary_R/dictionary_root_crown.htm 1 : Plant roots |
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