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Intraspecific genotypic diversity in plants.

Variations in the nuclear DNA, mainly as a result of quantitative modulations of DNA repeats belonging to different sequence families of satellite DNA and to the activity of transposable elements, have been assessed within several angiosperm species. These variations alter the amount and organization of the DNA and therefore the genotype, rather than the genome proper. They take place on an evolutionary time scale as the result of selection processes after the occurrence of uncontrolled events in the genome or may be due to direct responses of plant genomes to environmental stimuli that occur under plant-level control within a short developmental period of a single generation. These DNA changes are correlated to changes in the developmental dynamics and phenotypic characteristics of the plants, and the capability to carry out genotypic variation is an evolutionary trait that allows plant species to adapt to different environmental conditions, as well as to the variability of conditions in a given environment. The link between developmental and environmental stimuli and repetitive DNA that elicits the intraspecific diversity of plant genotypes may provide models of evolutionary change that extend beyond the conventional view of evolution by allelic substitution and take into account epigenetic effects of the genome structure.