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The Origin, Diversity and Biology of Shoot-Borne Roots

  • Peter W. Barlow
Part of the Basic Life Sciences book series (BLSC, volume 62)

Abstract

The term “adventitious root” is widely used to designate a root that arises either on an already lateralized root axis or at a site on the plant that is not itself a root (e.g., on a shoot or leaf) (Esau, 1953). In the latter case, the root, strictly speaking, need not be adventitious since, etymologically, this refers to a root located at an unusual site on the plant whereas such a root might be developing at a site in a way that is entirely consistent with the normal ontogenic pattern of the plant. It would be more exact to designate such a root as “shoot-borne.” This, in turn, leads to the idea that there are two types of roots: one is the shoot-borne type whose origin is self-defining, the other is the pole-borne root whose origin is from one of the poles of the embryo. According to Guédès, (Guédès et al, 1979) there is only one type of root: all roots are shoot-borne because even the embryonic root derives from the shoot-pole of the embryo. The same argument has been made for grasses (Tillich, 1977). Although this view may seem a reasonable argument from an evolutionary perspective, it is not one accepted by all morphologists. Whatever view is taken, it does seem that the term “adventitious root” can be restricted to its “true” meaning as referring to a root which develops out of the normal temporal sequence and/or at an unusual location. In most if not all cases, this would apply to a root that develops as a result of wounding and is thus evidence of a regenerative response. Adventitious roots, therefore, are simply a class of shoot-borne (or root-borne) roots developed under rather special circumstances (see the chapter by Haissig and Davis in this volume).

Keywords

Adventitious Root Tree Family Root Tuber Lower Devonian Root Type 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Peter W. Barlow
    • 1
    • 2
  1. 1.Department of Agricultural SciencesUniversity of BristolBristolUK
  2. 2.AFRC Institute of Arable Crops ResearchLong Ashton Research StationBristolUK

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