Characterization of the primocane flowering trait in the red raspberry (Rubus idaeus L.) and the effect of low temperature
In the red raspberry (Rubus idaeus L.) two types of cultivars are known according to their habit of flowering, primocane and floricane. In Chile, the main cultivar used is ‘Heritage’, primocane type. However, it has been seen that this character does not come to be expressed according to environment...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/233005 |
| Acceso en línea: | https://hdl.handle.net/10533/233005 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Agrícolas Otras Ciencias Agrícolas |
| Sumario: | In the red raspberry (Rubus idaeus L.) two types of cultivars are known according to their habit of flowering, primocane and floricane. In Chile, the main cultivar used is ‘Heritage’, primocane type. However, it has been seen that this character does not come to be expressed according to environmental conditions. Flowering is dependent on environmental conditions, mainly photoperiod and temperature, affecting the floral induction process. Thus, the objective of this research was to study the flowering in the season shoot in different genotypes and the effect of low temperatures on the expression of this character. For this, five genotypes were characterized to determine the degree of primocane fruiting trait and cold treatments were applied in two conditions, in small plants and during the night. To determine the effect of low temperatures, the development of floral lateral shoots, number of flowers, as well as growth and node formation was recorded. The morphology of the meristems of undeveloped buds and the expression of the TFL1 repressor gene were analyzed. The results indicate that there is a difference in the expression of the character and that this expression would be associated to the different requirements of low temperatures, for the floral induction according to the genotype. The TFL1 gene would be one of the main genes involved in this process. Key words: primocane, vernalisation, flowering, temperature |
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