Monocrotaline presence in the Crotalaria (Fabaceae) plant genus and its influence on arthropods in agroecosystems

Rech, Caroline; Ribeiro, Leandro do Prado; Bento, José Maurício Simões; Pott, Cristiano André; Nardi, Cristiane

doi:10.1590/1519-6984.256916

Cited by 8 publications

(4 citation statements)

References 75 publications

(140 reference statements)

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“…Leaves, stem, roots and nodules of some Crotalaria species contain high doses of monocrotaline and other pyrrolizidine alkaloids (Irmer et al 2015). These compounds protect the rattlepod against herbivorous, including phytonematodes (Rech et al 2024). These multiple actions against phytonematodes may explain why C. spectabilis is more effective in managing P. brachyurus than pearl millet and sunflower, which are equally poor hosts of this nematode.…”

Section: Discussionmentioning

confidence: 99%

Cowpea, sunflower, sorghum, pearl millet and showy ratllepod for Pratylenchus brachyurus management on soybean

Paes,

Carvalho,

Inomoto

2024

Preprint

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The lesion nematode Pratylenchus brachyurus is a major pest of soybean in Brazil, managed by treating seed with nematicides and replacing corn for pearl millet (Pennisetum glaucum) and rattlepods (Crotalaria spp.) as a second crop. However, these cover crops are not profitable, leading growers to consider alternatives as cowpea, sunflower, and sorghum. In fact, although cowpea and sorghum are susceptible to P. brachyurus, cowpea is widely cultivared in the Brazilian Cerrado, where P. brachyurus is prevalent, and the forage sorghum ‘BRS Ponta Negra’ has been recommended for P. brachyurus management, based on field observations. Considering the increasing importance of cowpea in the Brazilian Cerrado, three pot trials were carried out to evaluate the host status of modern cowpea cultivars for P. brachyurus. Additionally, two pot trials were carried out to evaluate the effect of cowpea, sunflower, forage sorghum ‘BRS Ponta Negra’, pearl millet and showy rattlepod on soybean production in soil with P. brachyurus, taking account the scarcity of studies that prove the benefits of replacing corn for resistant crops on soybean grain production. The five cowpea cultivars tested were highly suitable hosts for P. brachyurus, supporting previous findings. Therefore, cowpea should be avoided in infested growing areas, especially as a second crop after soybean. Among the cover crops, only showy rattlepod consistently decreased P. brachyurus population density and increased soybean grain production, proving to be more effective than pearl millet in managing P. brachyurus.

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Section: Discussionmentioning

confidence: 99%

Cowpea, sunflower, sorghum, pearl millet and showy ratllepod for Pratylenchus brachyurus management on soybean

Paes,

Carvalho,

Inomoto

2024

Preprint

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“…Se ha identificado que el género Crotalaria muestra contenidos elevados de APs como la monocrotalina, que inhibe las proteasas de los herbívoros generalistas asociados con los cultivos agrícolas. Así mismo, dichos APs hacen que las plantas de Crotalaria sean atrayentes de enemigos naturales de insectos como Chrysoperla externa, Doru luteipes, Nephila clavipes, Orius insidiosus y Trichogramma papilionis (Rech et al, 2022). Hasta el momento no existe evidencia del efecto insecticida de C. longirostrata, sin embargo, en otras especies del género Crotalaria se ha demostrado este efecto insecticida, como con C. retusa para el control de Callosobruchus maculatus con la cual se obtuvo una mortalidad de hasta el 54% y la reducción del 62% de emergencia de adultos (Obembe & Kayode, 2013).…”

Section: Introductionunclassified

Methanolic extract of Crotalaria longirostrata: Identification of secondary metabolites and insecticidal effect

López¹,

Beache²,

Fuentes³

et al. 2022

Sci. agropecu.

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The complications caused by the generation of resistance in the psyllid Bactericera cockerelli by chemical pesticides, raise the need for the alternative use of products that reduce resistance and ensure better control. The species Crotalaria longirostrata is a source of secondary metabolites, which show possible activity against insect pests. The objective of the research was to identify the compounds of the crude methanolic extract of C. longirostrata leaves, as well as to evaluate their biological activity on B. cockerelli nymphs. Twenty-five compounds were identified by Gas Chromatography coupled to Mass Spectrometry (GC-MS) analysis; the most abundant was 1β,2β-epoxy-1α-methoxymethyl-8α-pyrrolizidine; an alkaloid of the iminosugar group, reported for the first time in C. longirostrata, of which concentrations from 2 to 30 mg/mL of the methanolic extract had to be prepared to evaluate on B. cockerelli nymphs. It showed that at 48 h, there was a mortality of 73.2%-100% in the treatments of 8, 12, 16, 20, and 30 mg/mL. The mean lethal concentration (LC50) was 4.78 mg/mL and LC95 14,52 mg/mL. The results obtained with the methanolic extract of C. longirostrata leaves for controlling the insect B. cockerelli suggest that it can potentially be used as an alternative insecticide of botanical origin to manage the insect.

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“…This indicates varied modes of actions and varietal effects for the Crotalaria genus. Crotalaria species have pyrrolizidine alkaloids like monocrotaline that are antagonistic to the RKN(Moens et al 2009;Colegate et al 2012;Rech et al 2022). However, some Crotalaria spp.…”

mentioning

confidence: 99%

Nematicidal plants for root-knot nematode (Meloidogyne spp.) management in vegetable cropping systems

Njekete,

Caravel,

Massol

et al. 2024

Preprint

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Root-knot nematodes (RKN), Meloidogyne species, are a top global threat associated with economic crop yield losses. They are difficult to detect and control, especially given the recent restrictions on environmentally harmful chemicals. Thus, there is a need for alternative solutions for sustainable RKN management, such as nematicidal plants (non-hosts or poor hosts). Despite the advanced literature, the information for nematicidal plant species, cultivars, and specific RKN species is incomplete or inconsistent. We evaluated the host suitability of 28 nematicidal plant candidates in controlled climate chambers using a susceptible tomato and pepper as controls. The assessment was based on gall and egg mass counts after one RKN cycle. All screened candidates were less infected with M. incognita, M. arenaria, and M. enterolobii than tomatoes, suggesting all the candidates are either non/ poor hosts, except Allium fistulosum. Only Tagetes patula and T. erecta were consistently non-hosts to the three RKN species. Other candidates exhibited RKN species-specificity and varied in their poor host or non-host status depending on the variety. Selected nematicidal plants were further assessed for RKN juvenile penetration and had significantly lower M. incognita penetration than tomato. However, Crotalaria juncea had significantly higher M. incognita penetration than tomato. This suggests that the tested plants inhibit root penetration of most M. incognita juveniles at the rhizosphere level while C. juncea attracts the nematodes and restricts reproduction. There is potential for most of the nematicidal plants to be used in cropping systems for sustainable integrated RKN management.

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Monocrotaline presence in the Crotalaria (Fabaceae) plant genus and its influence on arthropods in agroecosystems

Cited by 8 publications

References 75 publications

Cowpea, sunflower, sorghum, pearl millet and showy ratllepod for Pratylenchus brachyurus management on soybean

Cowpea, sunflower, sorghum, pearl millet and showy ratllepod for Pratylenchus brachyurus management on soybean

Methanolic extract of Crotalaria longirostrata: Identification of secondary metabolites and insecticidal effect

Nematicidal plants for root-knot nematode (Meloidogyne spp.) management in vegetable cropping systems

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