| 词条 | Root cap |
| 释义 |
The root cap is a type of tissue at the tip of a plant root.[1] It is also called calyptra. Root caps contain statocytes which are involved in gravity perception in plants.[1] If the cap is carefully removed the root will grow randomly. The root cap protects the growing tip in plants.[1] It secretes mucilage to ease the movement of the root through soil,[1] and may also be involved in communication with the soil microbiota.[1] The purpose of the root cap is to enable downward growth of the root, with the root cap covering the sensitive tissue in the root.[2] Also, the root cap enables geoperception or gravitropism. This allows the plant to grow downwards (with gravity) or upwards (against gravity).[3] The root cap is absent in some parasitic plants[4]{{rp|138}} and some aquatic plants, in which a sac-like structure called the root pocket may form instead.[5]{{rp|2–76}} References1. ^1 2 3 4 {{cite journal | author = Raven, J.A. |author2=Edwards, D. | year = 2001 | title = Roots: evolutionary origins and biogeochemical significance | journal = Journal of Experimental Botany | volume = 52 | issue = 90001 | pages = 381–401 | doi = 10.1093/jexbot/52.suppl_1.381| pmid=11326045}} {{botany-stub}}2. ^{{Cite book|url=https://books.google.com/?id=r808AAAAIAAJ&pg=PA108&dq=root+cap#v=onepage&q=root%20cap&f=false|title=Introduction to Plant Cell Development|last=Burgess|first=Jeremy|date=1985-05-16|publisher=CUP Archive|isbn=9780521316118|language=en}} 3. ^{{Cite journal|last=Kuya|first=Noriyuki|last2=Sato|first2=Seiichi|year=2011|title=The relationship between profiles of plagiogravitropism and morphometry of columella cells during the development of lateral roots of Vigna angularis|url=http://www.sciencedirect.com/science/article/pii/S0273117710006101|journal=Advances in Space Research|volume=47|issue=3|pages=553–562|via=|doi=10.1016/j.asr.2010.09.009|bibcode=2011AdSpR..47..553K}} 4. ^{{cite book |last=Jeffrey |first=Edward Charles |title=The Anatomy of Woody Plants |publisher=Carpenter Press |location=Pomeroy, Ohio |year=2007 |pages= |isbn=978-1-4067-1634-4 |oclc= |doi= |accessdate=}} 5. ^{{cite book |last=Gupta|first=P.K.|title=Genetics: Classical to Modern|publisher=Rastogi Publications|location=|year=2007|pages=|isbn=978-8-1713-3896-2|oclc=|doi=|accessdate=}} 1 : Plant anatomy |
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