Published
Repeatability for yield total solids in a segregating population of rubber (Hevea brasiliensis) in Colombia
Repetibilidad del rendimiento de sólidos totales en una población segregante de caucho (Hevea brasiliensis) en Colombia
Keywords:
Heritability, Intra-class correlation coefficient, Total solids, Genetic parameters (en)Heredabilidad, Coeficiente de correlación intraclase, Sólidos totales, Parámetros genéticos (es)
Rubber (Hevea brasiliensis) is a specie of late yield performance. This makes breeding programs long-term and the decisions taken are based in the base population genetic parameters. The aim of
this research was to determinate a genetic potential of a rubber segregating population through the use of repeatability as a parameter, in order to make decisions to start a breeding program, with the purpose of increasing the total solids. In addition, to describe the target population and to explore the relation between total solids yield and climate variables. This research was carried out in a segregating population with 3395 trees in 12,000 m2 divided into nine plots located in the research center El Nus of Corpoica. Ten evaluations of total solids were recorded in the period between October 2014 and September 2016. The repeatability of total solids was determined from the estimation of individual and temporal environments variance using the Bayesian approach. Descriptive statistics for the total solid mean were used per plot and the correlation between total solids and climate variables were obtained.
The repeatability estimate value was between 0.64 and 0.66. The plots had a total solids variation coefficient among 64.76 and 86.51%. Total solids and cumulate photosynthetic active radiation had a direct correlation (0.25) for 15 and 30 days prior period, while mean relative humidity had an inverse correlation of -0.44 and -0.42 with total solid in the same periods. There is a good probability that for this population the total solid can be inherited in a high proportion.
El caucho (Hevea brasiliensis) es una especie de tardío rendimiento. Esto hace que los programas de mejoramiento sean a largo plazo y que los parámetros genéticos de la población base sean
importantes para tomar decisiones. El objetivo de esta investigación fue determinar el potencial genético de una población segregante de caucho, mediante la repetibilidad como parámetro para tomar decisiones e iniciar un programa de mejoramiento, que busca el incremento de sólidos totales; además, describir la población de estudio y explorar la relación de la producción de sólidos totales
con el clima. Esta investigación fue realizada en una plantación franca de caucho con 3395 árboles en 12.000 m2 y dividida en nueve sublotes, la cual está localizada en el centro de investigación El Nus de Corpoica. Fueron realizadas 10 evaluaciones de sólidos totales en el periodo entre octubre 2014 y septiembre 2016. La repetibilidad de los sólidos totales fue determinada a partir de la estimación de las varianzas de ambiente temporal y permanente usando un enfoque bayesiano. Se usó estadística descriptiva para la media de sólidos totales por sublote y fue explorada su relación con las variables climáticas. La repetibilidad estimada estuvo entre 0,64 y 0,66. Los sublotes presentaron un coeficiente de variación entre 64,76 y 86,51%. Sólidos totales tuvo una correlación con la radiación fotosintéticamente activa de 0,25 para los periodos anteriores a los 15 y 30 días, mientras que tuvo una correlación de – 0,44 y -0,46 para los mismos periodos. Hay una buena probabilidad de que sólidos totales tenga una alta heredabilidad.
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