Lippia alba (Mill.) N.E.Br. is an aromatic and medicinal shrub native to the American continent. Despite its potential as a source of essential oil for the pharmaceutical and cosmetics industries, few selection and genetic improvement studies have been carried out. The aim of this study was to provide genetic information on this species for breeding programs, showing its selection potential, by investigating clonal half-sib progenies. The following characteristics were evaluated per plant: leaf dry mass (LDM), total dry mass (TDM), leaf yield (LY), essential oil yield (EOY) and oil production (OP). Estimates were made for the several genetic parameters including absolute genetic gain at 30% selection intensity, correlations and relative contribution of additive and environmental effects to phenotypic correlation. Two experimental trials on 30 progenies were conducted: one in Campinas, state of São Paulo (SP), Brazil, with two harvests of the aerial part, and one in Monte Alegre do Sul, SP, Brazil, with only one harvest. The trials were conducted in a randomized block design consisting of subplots with three replications, each plot (progeny) consisting of 8 to 15 clonally-replicated plants with subplot harvesting. Variations were detected between progenies and harvests, as well as progeny/harvest interactions in the split plot experiment. High heritability and genetic gains were obtained at both sites for LDM, TDM and OP. The lowest variations among progenies were obtained for LY and EOY, highlighting selection problems. Negative additive genetic correlations were obtained for EOY × LDM, EOY × TDM, LY × TDM and LY × LDM. Selection for LDM resulted in increased oil production per plant (OP), even where there was a negative correlation between LDM × EOY.
As perdas anuais de grãos na pós-colheita, resultantes da ação de insetos, deterioração microbiana e outros fatores, são estimadas em 10-25% da produção mundial (Mohan & Fields 2002). Os produtos armazenados são infestados por insetos das ordens Coleoptera e Lepidoptera, que, por possuírem alto ABSTRACT RESUMO potencial biótico, capacidade de infestação cruzada, polifagia e distribuição cosmopolita, se tornam especialmente nocivos. O gorgulho, Sitophilus oryzae (L., 1763) (Coleoptera: Curculionidae), é um dos insetos de grãos armazenados mais disseminados e destrutivos. O controle tradicional desta população é dependente da aplicação sistemática e contínua de inseticidas líquidos e gasosos, que, embora eficientes,
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