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For origin of plant body in pteridophyte 'Telome theory' was proposed by:

For origin of plant body in pteridophyte 'Telome theory' was proposed by: Correct Answer Zimmerman

The 'Telome theory' was proposed by Zimmermann (1930).

Key Points

  • Zimmerman explain the origin of the megaphyll as well as of reproductive branches in vascular plants (pteridophyte).
  • According to him, all vascular plants evolved from a very simple leafless ancestor like Rhynia which had sterile and fertile axes.
  • The terminal axis bearing sporangia is called fertile telome and the one without it sterile telome.
  • Telomes are single-nerved extreme portions (at base or apex) of the plant body from the tip to the next point of branching or telome is a simple, ultimate terminal portion of a dichotomously branched plant axis.
  • A telome ends downwards at the point of junction with another telome, i.e. at the first sub adjacent branching.
  • The parts of the plant body connecting the telomes (i.e., the internodes between each two forkings) are called mesomes.
  • Telomes may be fertile bearing sporangia or sterile (vegetative) also known as phyllodes.
  • Following evolutionary development, telomes may be grouped together in various ways to form more complex bodies known as "syntelomes".
  • Syntelomes are composed of either sterile fertile telomes or a mixture of the two.
  • Fertile telomes are grouped into fertile telome trusses or sporangial trusses.
  • United phylloid from which sterile leaves and axes have been differentiated are "phylloid trusses".
  • From the syntelomes or telome trusses of the early land plants, the sporophyte of higher plants evolved throughout geological time along three major independent lines.
  • These were Lycopsid, Sphenopsid, and Pteropsid trends of evolution. 

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