Abstract:RESUMOAcompanhou-se o desenvolvimento de populações de Hyptis suaveolens (L.) Poit. (Labiatae) em três localidades paulistas: Horto Florestal de Sumaré, Câmpus da UNICAMP (Campinas) e Fazenda Santa Genebra (Distrito de Barão Geraldo, Campinas), em 1981-83. Em cada local, escolheu-se uma população exposta à luz e outra, à sombra, com o objetivo de verificar em que fase do ciclo de vida as populações se tornavam mais suscetíveis ao ataque de herbívoros; de estimar a abundância dos herbívoros naturais e seus efei… Show more
“…Because essential oils are secondary metabolites produced for plant's defense [13], genotypes attacked by wasps with gall formation are likely to produce more essential oil as defense strategy [22]. These results corroborate with Morais and Castanha (2012) [23], who found higher concentrations of monoterpenes in the essential oil of basil attacked by mealybug, and Queiroz-Voltan et al (1995) [24] in Hyptis suaveolens populations attacked by herbivores, which produced larger amounts of essential oil.…”
Section: : Two-dimensional Dendrogram Obtained In the Cluster Analysi...supporting
Eucalyptus are trees native to Australia and have been cultivated in various regions of the world. In its worldwide expansion, several native and exotic insects began to use these plants for their survival. Leptocybe invasa Fisher & La-Salle, 2004 (Hymenoptera: Eulophidae) is a gall wasp that lay eggs into leaves, young branches, and petioles causing galls; however, there are resistant and susceptible eucalyptus genotypes to gall formation. This study aimed to compare the chemical composition of eucalyptus genotypes and relate it to resistance and susceptibility to gall formation. Leaf oils were extracted by steam distillation and oil compositions were analyzed. The essential oils of eucalyptus genotypes resistant to gall formation had 12 constituents, which do not occur in susceptible genotypes, probably one of the factors that contributes to the resistance of these plants to gall formation. Thus, we suggest an early evaluation of resistant or susceptible eucalyptus genotypes, based on the chemical composition of the essential oils of these plants, avoiding economic losses of planting susceptible genotypes.
“…Because essential oils are secondary metabolites produced for plant's defense [13], genotypes attacked by wasps with gall formation are likely to produce more essential oil as defense strategy [22]. These results corroborate with Morais and Castanha (2012) [23], who found higher concentrations of monoterpenes in the essential oil of basil attacked by mealybug, and Queiroz-Voltan et al (1995) [24] in Hyptis suaveolens populations attacked by herbivores, which produced larger amounts of essential oil.…”
Section: : Two-dimensional Dendrogram Obtained In the Cluster Analysi...supporting
Eucalyptus are trees native to Australia and have been cultivated in various regions of the world. In its worldwide expansion, several native and exotic insects began to use these plants for their survival. Leptocybe invasa Fisher & La-Salle, 2004 (Hymenoptera: Eulophidae) is a gall wasp that lay eggs into leaves, young branches, and petioles causing galls; however, there are resistant and susceptible eucalyptus genotypes to gall formation. This study aimed to compare the chemical composition of eucalyptus genotypes and relate it to resistance and susceptibility to gall formation. Leaf oils were extracted by steam distillation and oil compositions were analyzed. The essential oils of eucalyptus genotypes resistant to gall formation had 12 constituents, which do not occur in susceptible genotypes, probably one of the factors that contributes to the resistance of these plants to gall formation. Thus, we suggest an early evaluation of resistant or susceptible eucalyptus genotypes, based on the chemical composition of the essential oils of these plants, avoiding economic losses of planting susceptible genotypes.
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