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AID: 0000600220
Английский
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Heterochrony in plant evolutionary studies through the twentieth century
The Botanical Review, . V. 66. No. 1. P. 5788 (32).
The evolution of plant morphology is the result of changes in developmental processes. Heterochrony, the evolutionary change in developmental rate or timing, is a major cause of ontogenetic modification during evolution. It is responsible for both interspecific and intraspecific morphological differences. Other causes include heterotopy, the change of structural position, and homeosis, the replacement of a structure by another. This paper discusses and reviews the role of heterochrony in plant evolution at the organismal, organ, tissue, cellular, and molecular levels, as well as the relationships among heterochrony, heterotopy, and homeosis. An attempt has been made to include all published studies through late 1999. It is likely that most heterochronic change involves more than one of the six classic pure heterochronic processes. Of these processes, we found neoteny (decreased developmental rate in descendant), progenesis (earlier offset), and acceleration (increased rate) to be more commonly reported than hypermorphosis (delayed offset) or predisplacement (earlier onset). We found no reports of postdisplacement (delayed onset). Therefore, although rate changes are common (both neoteny and acceleration), shifts in timing most commonly involve earlier termination in the descendant (progenesis). These relative frequencies may change as more kinds of structures are analyzed. Phenotypic effects of evolutionary changes in onset or offset timing can be exaggerated, suppressed, or reversed by changes in rate. Because not all developmental changes responsible for evolution result from heterochrony, however, we propose that plant evolution be studied from a viewpoint that integrates these different developmental mechanisms.


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