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The Potential Use of Annona (Annonaceae) by Products As a Source of Botanical Insecticides

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The Potential Use of Annona (Annonaceae) by Products As a Source of Botanical Insecticides The potential use of Annona (Annonaceae) by products as a source of botanical insecticides Leandro do Prado Ribeiroa*, Camila Moreira de Souzab, Keylla Utherdyany Bicalhoc, Edson Luiz Lopes Baldinb, Moacir Rossi Forimc, João Batista Fernandesc, José Djair Vendramimd a Research Center for Family Agriculture, Agricultural Research and Rural Extension Company of Santa Catarina (CEPAF/EPAGRI), Chapecó, Santa Catarina, Brazil. *E-mail: [email protected]; bDepartment of Crop Protection, College of Agricultural Sciences, São Paulo State University (FCA/UNESP) Botucatu, São Paulo, Brazil; d Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos, São Paulo, Brazil; c Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil. INTRODUCTION In addition, some species of Annona genera (e.g.: Annona muricata, Annona squamosa, Annona cherimolia, and Annona The structural and functional diversity of secondary metabolites cherimolia x Annona squamosa) have great economic (allelochemicals) is a key factor for the survival and evolutionary importance due to their edible fruits of ample commercial success of plant species inhabiting an environment with an interest. Consequently, a considerably cultivated area (~ 14,000 abundance of natural enemies. Therefore, the tropical flora, hectares) with these species is observed in Brazil. However, most with its unique biodiversity, is a promising natural reservoir of of Annona fruits production are destined for fruit-processing bioactive substances. In this context, Brazil has the highest plant industries and commercialized as frozen pulps for juice genetic diversity in the world offering enormous potential for preparations due to its small shelf life. Thus, the seeds, which the development of novel active substances based on natural composed between ~7% of total weight of fruits, are discarded products. and could serve as an inexpensive and readily available source In the agricultural context, the study of defense mechanisms of biomass for botanical insecticides development. In light of of plants comprises an important approach for the selection this potential, some studies have been conducted in order to of new insecticides/acaricides compounds that meet the changing these industrial wastes into ecofriendly solutions for requirements of effectiveness, safety and selectivity, which are pest control. essential precepts of the integrated pest management (IPM) BIOACTIVE COMPOUNDS FROM Annona SPECIES programs. Plant-derived compounds show great potential for the management of populations of arthropod pests, both Despite the limited number of studies, a large number of through homemade preparations for direct use in the field and compounds of diverse chemical natures have been isolated in in the development of botanical insecticides (non-synthetic), as several structures of the genus Annona, including alkaloids, well as templates molecules for the synthesis of new synthetic acetogenins, diterpenes, and flavonoids. Among the compounds, insecticides. annonaceous acetogenins stand out because of their structural abundance and the wide range of biological activities they Among the botanical families that occur in the Neotropical region, exhibit, such as powerful insecticidal and acaricidal activities Annonaceae is the main family of the order Magnoliales and is (Colom et al. 2010). The acetogenins comprise a series of natural one of the most specious families of angiosperms comprising products (C-35/C-37) derived from long-chain fatty acids (C-32/C- 135 genera and approximately 2,500 species (Chatrou et al., 34) combined with a unit of 2-propanol (Alali et al., 1999), which 2004). Annonaceae exhibits a pantropical distribution with 40 are found only in some genera [Annona, Anomianthus, Asimina, genera and 900 species in the Neotropical region. In Brazil, this Desepalum, Goniothalamus, Rollinia (now Annona), Polyalthia, family is represented by 29 genera (1endemic) and 386 species, Porcelia, Uvaria, and Xylopia] of the Annonaceae family (Johnson, and a large proportion of this richness is found in the Amazon 2000) and with a high concentration in their seeds. Rain Forest and Atlantic Forest (Maas et al., 2013). www.seea.es Boletín SEEA nº2, 2017 26 Acetogenins are potent mitochondrial poisons, inhibiting the Given this potential, the National Science and Technology cellular energy production (Isman & Seffrin, 2014). More specifically, Institute for Biorational Control of Pest Insects (INCT-CBIP), which acetogenins block the respiratory chain at complex I (NADH: aggregate 7 Brazilian institutions from 5 States, established in ubiquinone oxidoreductase) of the mitochondrial electron- 2011, a multidisciplinary research program aiming at obtaining transport system and of the enzyme NADH:oxidase in the cell bioactive allelochemicals from Neotropical Annonaceae. membrane of target arthropods, directly affecting electron Using the maize weevil (Sitophilus zeamais) as bioindicator, transport in the mitochondria and causing apoptosis as result a comprehensive initial screening was conducted in order to of ATP deprivation (Alali et al., 1999). Moreover, recent study evaluated the bioactivity of ethanolic extracts of different parts suggest that acetogenins at sublethal doses cause damage in from 29 Annonaceae species (7.5% of all Brazilian species) the insect midgut epithelium and digestive cell, decreasing the belonging to 11 different genera. As results, seeds from genus expression of genes associated with transport and absorption of Annona were identified as the main sites of accumulation of nutrients, metabolites and nonelectrolytes as well as increasing compounds with activity against the maize weevil, being the the expression of genes linked with autophagy induction (Costa ethanolic extracts prepared from seeds of A. mucosa, A. sylvatica, et al., 2016). A. montana, and A. muricata the most active treatments (Ribeiro et al., 2016). Among these derivatives, the extract prepared from In addition to lethal toxicity, acetogenin-based extracts or isolated the A. mucosa seeds – ESAM (Figure 1) demonstrated the lowest compounds also affect the insect development and feeding and LC values and, consequently, the most pronounced insecticidal oviposition behavior (Table 1). In light of the promising acute 50 activity. and chronic effects on pest species of agricultural importance, some acetogenin-based formulations (Anosom®, BioRakshak®, AnonaCin®) were recently released on the market in eastern countries (e.g.: India). BIOPROSPECTING STUDIES WITH NEOTROPICAL ANNONACEAE – THE BRAZILIAN CASE Bioprospecting studies carried out with diverse flora species constitute a strategic action for the creation of differentiated products with high-added value, such as agricultural pesticides. In addition, the medicinal, economic, and ecological importance of native species, as well as the risk of extinction by human predatory action, has supported the studies of these plants for their preservation and sustainable use. Figure 1. Tree, fruits, and seeds of Annona mucosa Table 1. Lethal and sublethal toxicities of Annona mucosa seeds derivatives against some arthropod-pest of agricultural relevance in Brazil. Tested derivative Arthropod pest LC /LD (exposure form) Sublethal toxicities References (local of bioassay) 50 50 Ethanolic crude extract LC =2,608 ppm Oviposition deterrence Panonychus citri 50 Ribeiro et al., 2014c (laboratory trial) (residual contact) (EC50 = 3,194.80 ppm) Ethanolic crude extract and LC =328.86 ppm (ingestion); 50 growth inhibition ( Trichoplusia ni formulated extract (laboratory LD = 12.61 µg larva-1 Ribeiro et al., 2014a 50 EC = 114.71ppm) and greenhouse trial) (topical application) 50 Formulated extract Strong reduction of population Myzus persicae -- Ribeiro et al., 2014a (greenhouse trial) growth rate (at 2,500 ppm) larval growth inhibition (EC = 580.4 ppm), Ethanolic crude extract 50 interference in the insect development, Ansante et al., 2015; Spodoptera frugiperda and isolated acetogenin 842.90 ppm (ingestion) and increase in the proportion of pupae (laboratory trial) Ribeiro et al., 2016 and adults with morphological changes Ethanolic crude extract and LC =57.76 ppm Diaphorina citri formulated extract (laboratory, 50 Feeding and oviposition deterrence Ribeiro et al., 2015 (residual contact) greenhouse, and field trial) Ethanolic crude extract 621.70 ppm Inhibition of the F1 progeny and Sitophilus zeamais Ribeiro et al., 2016 (laboratory trial) (residual contact) reduction in grain losses Seed ethanol Extract MD = 3 days Atta sexdens rubropilosa -- Bicalho, 2016 (laboratory trial) (2,0 mg mL-1, ingestion) larval growth inhibition (EC = 580.4 ppm), Ethanolic crude extract, isolated 50 LC =1,479 ppm interference in the insect development, Helicoverpa armigera acetogenin, and formulated extract 50 Souza et al., 2017 (ingestion) and increase in the proportion of pupae (laboratory and greenhouse trial) and adults with morphological changes www.seea.es Boletín SEEA nº2, 2017 27 In addition, ESAM caused promising insecticidal/insectistatic (Giongo et al., 2016, Carvalho et al., 2015, Rodrigues et al., effects on other important pest species for tropical fruit crops, 2016). Each particle can contain several molecules, and, after vegetables, and other commodities (cereals and oilseeds) the drying process and having an increased storage period, in laboratory tests with crude extracts and
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