Ganhos de seleção para produção de cachos em híbridos interespecíficos entre caiaué e dendê

The objective of this work was to estimate selection gains for bunch production in hybrids obtained from “caiaué” (Elaeis oleifera) parents from the Manicoré population and oil palm (Elaeis guineensis) parents from the La Mé population, from the third to the eighth year after planting. Thirty-nine full-sibling progenies were evaluated in experiments conducted in a randomized complete block design, with four replicates and 12 plants per plot. The genetic gain estimates were 27.6% for the ten best selected F1 individuals, 13.7% for the four best selected progenies from parents of both sexes, 6.4% for the selected progenies of the five best male parents, 6.0% for the selected progenies of the two best families from male parents, and 4.0% for the selected progenies of the best descendants from male parents. Genetic gains for bunch production can be achieved, in the short term, through selection restricted to male parents, and, in the medium term, through selection of both male and female parents and cloning of F1 individuals.O objetivo deste trabalho foi estimar ganhos de seleção para produção de cachos em híbridos obtidos de genitores caiaué (Elaeis oleifera) da população Manicoré e dendê (Elaeis guineensis) da população La Mé, do terceiro ao oitavo ano após o plantio. Avaliaram-se 39 progênies de irmãos completos em experimentos conduzidos em delineamento de blocos ao acaso, com quatro repetições e 12 plantas por parcela. As estimativas de ganho genético foram de 27,6% para a seleção dos dez melhores indivíduos F1, 13,7% para a seleção das quatro melhores progênies de genitores de ambos os sexos, 6,4% para a seleção das progênies dos cinco melhores genitores masculinos, 6,0% para a seleção das progênies das duas melhores famílias de genitores masculinos, e 4,0% para a seleção das progênies da melhor descendência de genitores masculinos. É possível obter ganhos genéticos para produção de cachos, em curto prazo, com a seleção restrita a genitores masculinos, e, em médio prazo, com a seleção de genitores masculinos e femininos e com a clonagem de indivíduos F1

Bunch yield of interspecific hybrids of American oil palm with oil palm in the juvenile phase

To identify superior genotypes, 42 progenies of interspecific hybrids between American oil palm and oil palm were evaluated in an area with incidence of bud rot. The following variables were assessed: total bunch yield (TBY), number of bunches (NB) and mean bunch weight (MBW) from the third to the sixth year of cultivation and estimates of genetic parameters obtained by REML/BLUP procedures. High heritability values of the evaluated traits were observed. The gain estimates for TBY were 14.49% for the selection of the five best progenies and 33.36% for the selection of the five best trees, considering multiplication by cloning. A medium correlation was observed between TBY and NB (r2 = 0.33±0.021), a high correlation between TBY and MBW (r2 = 0.53±0.019) and a negative high correlation between NB and MBW (r2 = –0.60±0.018). The results indicate a high expectation of gains with selection for TBY