Strategies of selection for carrot seed germination at high temperatures
DOI:
https://doi.org/10.5433/1679-0359.2011v32n3p849Keywords:
Daucus carota L., Thermo-inhibition, Stand establishmentAbstract
Among the carrot cultivars developed for summer cultivation, stand out those from the “Brasilia” group. These cultivars present higher performance in relation to the others commercialized in the country due to their productivity, resistance to leaf-blight diseases and higher adaptation to the Brazilian summer conditions. However, it is necessary to increase, by selection, the potential for carrot seed germination at high temperatures (above 35ºC), resulting in seed economy and more uniform plant establishment, especially during warm weather conditions. Thus, the objective of this study was to select carrot populations with seeds able to germinate under conditions of high temperature. The experiment was carried out in Brasília, DF, in the year of 2007. Four replications of fifth seeds from forty-seven carrot half-sib families were incubated at 20ºC and 37ºC in a randomized block design. The data were submitted to the analysis of variance, application of selection indexes and estimation of gains with the selection. The selection for germination of carrot seeds at high temperatures (37ºC) were not effective. The values of vigor and germination at 37°C were low, suggesting that this temperature is approaching the biological limit of the populations of the carrot group Brasilia. At 20°C it is possible to differentiate the genotypes regarding to physiological quality of seeds.
Downloads
Published
How to Cite
Issue
Section
License
O Copyright dos manuscritos publicados pertence ao periódico. Como são publicados em um periódico de acesso aberto, eles estão disponíveis gratuitamente, para uso privado ou para fins educacionais e não comerciais.
A revista tem o direito de fazer, no documento original, alterações referentes às normas lingüísticas, ortografia e gramática, com o objetivo de garantir as normas padrão do idioma e a credibilidade da revista. No entanto, respeitará o estilo de escrita dos autores.
Quando necessário, alterações conceituais, correções ou sugestões serão encaminhadas aos autores. Nesses casos, o manuscrito deve ser submetido a uma nova avaliação após revisão.
A responsabilidade pelas opiniões expressas nos manuscritos é inteiramente dos autores.