Selection gains for bunch production in interspecific hybrids between “caiaué” and oil palm

Abstract: 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.

摘要：本研究旨在估算种植后第3至第8年，由马尼科雷（Manicoré）种群的美洲油棕（Elaeis oleifera，俗称‘卡亚韦’caiaué）亲本与拉梅（La Mé）种群的非洲油棕（Elaeis guineensis）亲本杂交获得的杂种的果穗产量选择增益。试验采用随机完全区组设计，共评估39个全同胞家系，设置4次重复，每小区定植12株植株。遗传增益估算结果显示，选取的10个最优F1个体的遗传增益为27.6%，选取的源自双亲的4个最优家系为13.7%，选取的5个最优雄性亲本对应的家系为6.4%，选取的雄性亲本来源的2个最优家族的家系为6.0%，选取的雄性亲本最优后裔对应的家系为4.0%。果穗产量的遗传增益可在短期内通过仅选择雄性亲本实现，中期则可通过同时选择雌雄亲本并克隆F1个体达成。