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Marsaro IB, Cozzer GD, Cararo ER, Brito RD, Borges WG, Dal Magro J, Lima-Rezende CA, Rezende RDS. Less is more: partial larvicidal efficacy of plant leachate leads to larger Aedes aegypti mosquitoes. BULLETIN OF ENTOMOLOGICAL RESEARCH 2023; 113:684-692. [PMID: 37545328 DOI: 10.1017/s0007485323000366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Major efforts to control the population of Aedes aegypti mosquitoes involve the use of synthetic insecticides, which can be harmful to the environment. Most plant compounds are eco-friendly and some of them have biocontrol potential, whereas a fraction of these compounds is released into the environment through the leaf-leaching process. We evaluated the effects of secondary compounds from Ateleia glazioviana and Eucalyptus grandis senescent leaf leachates on Ae. aegypti larval mortality, adult emergence time, and wing size using a microcosm approach. The microcosms consisted of 10 larvae kept in water (control) and under four treatments with leachates from a combination of plant species and leaching time (7 or 14 days). Chemical analyses of the leachates showed the presence of carboxaldehyde and Heptatriocotanol, which have antimicrobial properties, potentially reducing the food available for larvae. β-Sitosterol, Stigmasterol, α-Amyrin, and Lupeol are compounds with inhibitory, neurotoxic, and larvicidal effects. Both plant species' leachates increased larval mortality and decreased emergence time due to the presence of compounds toxic to the larvae. Larger organisms emerged in treatments with 7-days leachates, likely due to the high concentration of dissolved organic matter in the leachates. The higher mortality in 7-days leachates may also increase the organic matter from co-specific decomposition, improving adult size. Therefore, if the mosquito population is not locally extinct, compounds present in leaf leachates may act as a resource enhancing larvae growth, potentially increasing survivors' fitness. In conclusion, biocontrol attempts using urban green spaces may have unexpected outcomes, such as resulting in larger pest organisms.
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Affiliation(s)
- Isabella Bodanese Marsaro
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Gilberto Dinis Cozzer
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Emanuel Rampanelli Cararo
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Raquel De Brito
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - William Gabriel Borges
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Jacir Dal Magro
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Cássia Alves Lima-Rezende
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
| | - Renan de Souza Rezende
- Communitarian University of Chapecó Region - UNOCHAPECÓ, Servidão Anjo da Guarda, 295-D, Efapi, 89809-000 Chapecó, Santa Catarina, Brazil
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Ang S, Liang J, Zheng W, Zhang Z, Li J, Yan Z, Wong WL, Zhang K, Chen M, Wu P. Novel Matrine Derivatives as Potential Larvicidal Agents against Aedes albopictus: Synthesis, Biological Evaluation, and Mechanistic Analysis. Molecules 2023; 28:molecules28073035. [PMID: 37049799 PMCID: PMC10096473 DOI: 10.3390/molecules28073035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/17/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023] Open
Abstract
A large number of studies have shown that matrine (MA) possesses various pharmacological activities and is one of the few natural, plant-derived pesticides with the highest prospects for promotion and application. Fifty-eight MA derivatives were prepared, including 10 intermediates and 48 target compounds in 3 series, to develop novel mosquitocidal agents. Compounds 4b, 4e, 4f, 4m, 4n, 6e, 6k, 6m, and 6o showed good larvicidal activity against Aedes albopictus, which is both a highly aggressive mosquito and an important viral vector that can transmit a wide range of pathogens. Dipping methods and a bottle bioassay were used for insecticidal activity evaluation. The LC50 values of 4e, 4m, and 6m reached 147.65, 140.08, and 205.79 μg/mL, respectively, whereas the LC50 value of MA was 659.34 μg/mL. Structure–activity relationship analysis demonstrated that larvicidal activity could be improved by the unsaturated heterocyclic groups introduced into the carboxyl group after opening the D ring. The MA derivatives with oxidized N-1 lost their mosquitocidal activities, indicating that the bareness of N-1 is crucial to maintain their anti-mosquito activity. However, the activity was not greatly influenced by introducing a cyan group at C-6 or a benzene sulfonyl group at N-16. Additionally, compounds 4e and 4m exhibited good inhibitory activities against acetylcholinesterase with inhibitory rates of 59.12% and 54.30%, respectively, at a concentration of 250 μg/mL, whereas the inhibitory rate of MA was 9.88%. Therefore, the structural modification and mosquitocidal activity of MA and its derivatives obtained here pave the way for those seeking strong mosquitocidal agents of plant origin.
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Affiliation(s)
- Song Ang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Jinfeng Liang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Wende Zheng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Zhen Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Jinxuan Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Zhenping Yan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
| | - Wing-Leung Wong
- The State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China
| | - Kun Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
- Correspondence: (K.Z.); (M.C.); (P.W.); Tel.: +86-13822330019 (K.Z.); +86-18312066545 (M.C.); +86-18825179347 (P.W.)
| | - Min Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
- Correspondence: (K.Z.); (M.C.); (P.W.); Tel.: +86-13822330019 (K.Z.); +86-18312066545 (M.C.); +86-18825179347 (P.W.)
| | - Panpan Wu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- International Healthcare Innovation Institute (Jiangmen), Jiangmen 529040, China
- Correspondence: (K.Z.); (M.C.); (P.W.); Tel.: +86-13822330019 (K.Z.); +86-18312066545 (M.C.); +86-18825179347 (P.W.)
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