Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/18850
Tipo: Artigo
Título: The polyploidy and its key role in plant breeding
Autor(es): Sattler, Mariana Cansian
Carvalho, Carlos Roberto
Clarindo, Wellington Ronildo
Abstract: Polyploidy is a major force in the evolution of both wild and cultivated plants. Polyploid organisms often exhibit increased vigor and, in some cases, outperform their diploid relatives in several aspects. This remarkable superiority of polyploids has been the target of many plant breeders in the last century, who have induced polyploidy and/or used natural polyploids in many ways to obtain increasingly improved plant cultivars. Some of the most important consequences of polyploidy for plant breeding are the increment in plant organs (“gigas” effect), buffering of deleterious mutations, increased heterozygosity, and heterosis (hybrid vigor). Regarding such features as tools, cultivars have been generated with higher yield levels, improving the product quality and increasing the tolerance to both biotic and abiotic stresses. In some cases, when the crossing between two species is not possible because of differences in ploidy level, polyploids can be used as a bridge for gene transferring between them. In addition, polyploidy often results in reduced fertility due to meiotic errors, allowing the production of seedless varieties. On the other hand, the genome doubling in a newly formed sterile hybrid allows the restoration of its fertility. Based on these aspects, the present review initially concerns the origin, frequency and classification of the polyploids, progressing to show the revolution promoted by the discovery of natural polyploids and polyploidization induction in the breeding program status of distinct crops.
Palavras-chave: Autopolyploidy
Allopolyploidy
Hybridization
Plant breeding
Heterosis
Hybrid bridge
“Gigas” effect
Editor: Planta
Tipo de Acesso: Springer-Verlag Berlin Heidelberg
URI: https://doi.org/10.1007/s00425-015-2450-x
http://www.locus.ufv.br/handle/123456789/18850
Data do documento: 29-Dez-2015
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