INVESTIGADORES
PESSINO Silvina Claudia
capítulos de libros
Título:
Genome structure and gene expression in polyploid plants
Autor/es:
PESSINO SC; MARTELOTTO LG
Libro:
Floriculture, Ornamentals and Plant Biotechnology
Editorial:
Global Science Books. Springer.
Referencias:
Lugar: London; Año: 2006; p. 300 - 308
Resumen:
A raise in the number of total genomic complements in the nucleus or polyploidization is a common event in the evolutionary history of most angiosperms. New phenotypes often arise with polyploid formation and determine their success in nature or their further selection for use in agriculture. Enormous progress has been achieved in the last few years regarding the understanding of the molecular mechanisms concerned with polyploidization. It was shown that while in a number of species it appears to involve extensive alterations of the progenitor genomes, full additivity associated to genetic and epigenetic stasis is observed in others. Genomic changes are usually followed by a refined gene expression re-patterning which have most probably an adaptive significance. It could involve dosage-regulation, altered regulatory interactions and both rapid and long-term genetic and epigenetic changes. The objective of this chapter is to summarize the principal mechanisms leading to genome alterations and novel forms of gene expression in polyploid plants and briefly analyze their evolutionary significance.