Pyrrolizidine Alkaloids in Crotalaria Taxa from Northern Australia: Risk to Grazing Livestock.

Crotalaria species containing hepatotoxic pyrrolizidine alkaloids grow widely in pastures in northern Australia and have sporadically poisoned grazing livestock. The diverse Crotalaria taxa present in these pastures include varieties, subspecies, and chemotypes not previously chemically examined. This paper reports the pyrrolizidine alkaloid composition and content of 24 Crotalaria taxa from this region and assesses the risk of poisoning in livestock consuming them. Alkaloids present in C. goreensis, C. aridicola subsp. densifolia, and C. medicaginea var. neglecta lack the esterified 1,2-unsaturated functionality required for pyrrole adduct formation, and these taxa are not hepatotoxic. Taxa with high levels of hepatotoxic alkaloids, abundance, and biomass pose the greatest risk to livestock health, particularly C. novae-hollandiae subsp. novae-hollandiae, C. ramosissima, C. retusa var. retusa, and C. crispata. Other species containing moderate alkaloid levels, C. spectabilis and C. mitchellii, also pose significant risk when locally abundant.

Controle de Meloidogyne javanica em tomate-salada e feijao-de-vagem com o cultivo previo de Crotalaria spectabilis.

O feijão-de-vagem é uma hortaliça severamente atacada por Meloidogyne javanica quando cultivada após o tomate-salada. Para avaliar a viabilidade de cultivo do feijão-de-vagem após o tomate-salada, cultivou-se a Crotalaria spectabilis, em faixas, por período de quatro meses, previamente ao cultivo do tomateiro. Faixas cultivadas com quiabeiro, antes do cultivo com tomate-salada, foram mantidas para comparação. Nas faixas cultivadas anteriormente com C. spectabilis, com os índices de multiplicação (IM) variando de 11 a 76 por parcela e os números de ovos do nematóide de 1.500 a 6.000 por planta, as produtividades foram de 2 a 26% maiores em cultivares de tomateiro e de 6 a 31,5% maiores em cultivares de feijão-de-vagem, em comparação com as produtividades obtidas nas faixas de quiabeiro, onde foram obtidos IM de 17 a 165 e números de ovos do nematóide que variaram de 7.200 a 19.000 por planta em cultivares de tomateiro e de feijão-de-vagem. O cultivo prévio da C. spectabilis por quatro meses é uma tecnologia viável para o controle de M. javanica, viabilizando a seqüência de cultivos com tomate-salada e feijão-de-vagem.

Effect of trypsin inhibitor from Crotalaria pallida seeds on Callosobruchus maculatus (cowpea weevil) and Ceratitis capitata (fruit fly)

GOMES, Carlos E. M. et al. Effect of trypsin inhibitor from Crotalaria pallida seeds on Callosobruchus maculatus (cowpea weevil) and Ceratitis capitata (fruit fly). Plant Physiology and Biochemistry (Paris), v. 43, n. 12, p. 1095-1102, 2005.ISSN 0981-9428. DOI:10.1016/j.plaphy.2005.11.004.

Purificação, caracterização e atividade bioinseticida de um inibidor de tripsina de sementes de Crotalaria pallida

A proteinaceous trypsin inhibitor was purified from Crotalaria pallida seeds by ammonium sulphate fractionation, affinity chromatography on immobilized Trypsin-Sepharose and TCA precipitation. The trypsin inhibitor, named ITC, had Mr of 32.5 kDa by SDS-PAGE and was composed by two subunits with 27.7 and 5.6 kDa linked by disulphide bridges, a typical characteristic of Kunitz-Inhibitor family. ITC was stable until 50°C, and at 100°C its residual activity was of about 60%. Also, ITC was stable at pHs 2 to 12. The inhibition of trypsin by ITC was non-competitive, with a Ki of 8,8 x 10-7M. ITC inhibits weakly other serine proteinases such as chymotrypsin and elastase. The inhibition of papain (44% of inhibition), a cysteine proteinase was an indicative of the bi-functionality of ITC. In vitro assays against digestive proteinases from several Lepdoptera, Diptera and Coleoptera pests were made. ITC inhibited in 100% digestive enzymes of Ceratitis capitata (fruit fly), Spodoptera frugiperda and Alabama argillacea, the last one being a cotton pest. It also inhibited in 74.4% Callosobruchus maculatus (bean weevil) digestive enzymes, a Coleoptera pest. ITC, when added in artificial diet models, affected weakly the development of C. capitata larvae and it had a WD50 of 2.65% to C. maculatus larvae

Aspectos morfológicos de frutos e sementes e caracterização citogenética de Crotalaria lanceolata E. Mey. (Papilionoideae - Fabaceae)

Frutos, sementes e plântulas de Crotalaria lanceolata, conhecida popularmente como guizo-de-cascavel, chocalho-de-cobra, xique-xique ou feijão-de-guizo, planta tóxica infestante que ocorre no Estado de São Paulo, foram estudadas morfologicamente e citogeneticamente. Os frutos são secos, deiscentes, polispérmicos e do tipo legume. As sementes são reniformes e o embrião é constituído de eixo embrionário e dois cotilédones. A testa pode apresentar variadas tonalidades de castanhos. A germinação é epígea e fanerocotiledonar. A espécie apresenta número cromossômico diplóide 2n = 16 com formulação cariotípica 12M + 4SM e comprimento cromossômico médio geral de 3,340 ± 0,689.

Estimativa da área foliar de crotalaria juncea l. a partir de dimensões lineares do limbo foliar

Knowledge of the leaf area plant are needed for agronomic and physiological studies involving plant growth. The aim of this study was to obtain a mathematical model using linear measures of leaf dimensions, which will allow the estimation of leaf area of Crotalaria juncea L. Correlation studies were conducted involving real leaf area (Sf) and leaf length (C), maximum leaf width (L) and the product between C and L. All tested models (linear, exponential or geometric) provided good estimation of leaf area (above 87%). The better fit was attained using linear model, passing or not through the origin. From a practical viewpoint, it is suggested to use the linear model involving the C and L product, using a linear coefficient equal to zero. Estimation of leaf area of Crotalaria juncea L. can be obtained using the model Sf = 0.7160 x (C*L) with a determination coefficient of 0.9712.

ASPECTOS PATOLÓGICOS da INTOXICAÇÃO DE SUÍNOS POR SEMENTES DE Crotalaria spectabilis (Fabaceae)

Foram utilizados 24 suínos desmamados, distribuídos em quatro tratamentos, com seis animais em cada. Os suínos dos tratamentos 1, 2, 3 e 4 receberam, durante 90 dias, ração com respectivamente: 0,0, 0,2, 0,4 e 0,6% de sementes de Crotalaria spectabilis. Os animais que morreram durante o período experimental foram necropsiados logo após a morte. Os sobreviventes foram sacrificados no último dia do experimento. Durante as necropsias, foram colhidos fragmentos do fígado, rim, pulmão e estômago, para realização de exame histopatológico. Os principais sintomas da intoxicação foram edemas subcutâneos, principalmente nos membros, na face e região do pescoço, mucosas oral e ocular pálidas, cerdas eriçadas, caquexia e apatia. O hidropericárdio foi a lesão macroscópica mais comum, acometendo vários animais que receberam a ração contaminada. As principais lesões microscópicas foram fibrose, proliferação de ductos biliares e megalocitose no fígado, broncopneumonia e bronquite crônicas, megalocitose de células epiteliais tubulares renais, nefrose e nefrite crônica, bem como gastrite e ulceração gástrica. Os resultados destes experimentos indicam que ração contaminada com sementes de C. spectabilis, nas proporções utilizadas, foi tóxica para suínos.

Matéria seca e produção de grãos de Crotalaria juncea L. submetida à poda e adubação fosfatada

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Estudos hematológico e hormonal de frangos de corte tratados com contaminantes do milho: Crotalaria spectabilis e Senna occidentalis

Crotalaria spectabilis (crotalária) e a Senna occidentalis (fedegoso) podem crescer em plantações de milho e, durante a colheita, este cereal pode ser contaminado com as sementes dessas plantas, que apresenta toxicidade para os animais. O objetivo deste estudo foi investigar os parâmetros morfométricos dos eritrócitos, as variáveis hematológicas e a concentração plasmática hormonal dos frangos de corte tratados com ração de dois níveis de energia, que foi adicionada de 0,1% e 0,5% de sementes de Crotalaria spectabilis e Senna occidentalis, respectivamente. Cento e oitenta frangos de corte foram divididos em seis grupos, de acordo com uma análise fatorial 3 x 2 (controle, crotalária e fedegoso como tratamentos principais e dois níveis de energia, 2.900 e 3.200 kcal ME/kg de ração). Os resultados deste experimento mostraram que o efeito tóxico da crotalária determinou uma redução no número de hemácias, no valor do hematócrito e do VCM, não influenciando os parâmetros morfométricos avaliados. A semente de crotalária induziu, também, aumento na incidência de ascite, em função de sua toxicidade hepática. Já a semente de fedegoso não mostrou toxicidade suficiente para induzir ascite nos frangos.

Molecular characterisation and evolutionary relationships of a potyvirus infecting Crotalaria in Brazil - Brief report

The 3' terminal genomic region of a potyvirus causing mosaic disease in several Crotalaria species has been cloned and sequenced. Comparisons of the nucleotide and deduced amino acid (aa) sequences of the cloned cDNA with those from other potyviruses show that the Crotalaria-infecting virus (designated Crotalaria mosaic virus; CrMV) is closely related to Cowpea aphid-borne mosaic virus (CABMV). Maximum identity (95.4%) at the coat protein (CP) aa level was observed between CrMV and a Brazilian strain of CABMV. Phylogenetic analyses derived from the sequence alignments of the CP and 3' untranslated region confirmed the identification of CrMV as a strain of CABMV and the name CABMV-Cr is suggested.

Estudo experimental sobre a intoxicação de Gallus gallus domesticus com semente de crotalaria spectabilis. II efeito em aves na fase final de crescimento

This study was undertaken to investigate the toxic effect of Crotalaria spectabilis seeds added to the ration for commercial broilers during the final phase of growth. Ground seeds were added at different concentrations to the ration: 0.0% (control), 0.01%, 0.1% and 0.4%. Rations containing 0.4% caused symptoms of intoxication, beginning in the second week of the study. During the third week birds showed bristling, apathy, general weakness, distended abdomen and agglomeration. In the fourth week, four animals died. Necropsy revealed prominent ascites and severe lesions of liver, kidney and lung. Microscopic examination revealed necrosis of hepatocytes, inflammatory cell infiltration, hypertrophy and hyperplasia of biliary duct cells leading to atresia and cholestasis. Prominent cartilaginous and osseous nodules in the lungs were also present as well as degenerative, changes in the kidney tubules and necrosis of cells of the bursa. All the broilers receiving a ration with 0.1% of Crotalaria seeds showed ascites and slight lesions of the liver. The remaining groups showed no reduction in weight gains, lesions or clinical symptoms. It is concluded that broilers during the final phase of growth are sensitive to administrations of seeds of C. spectabilis in their ration. The presence of ascites and cartilaginous and osseous nodules in the lungs of the affected birds was also considered important.

Dessecação de Crotalaria juncea no outono

The objective of this study was to evaluate the effect of glyphosate applied alone and in mixtures with 2.4-D or metsulfuron methyl in the desiccation of mature plants of Crotalaria juncea during the fall season, in a field crop. Two experiments were carried out using a randomized experimental block design, in a 4 × 3 factorial scheme, with four replications. Treatments in the first experiment were formed by four doses (0.00, 0.54, 1.08 and 1.62 kg ha -1) of glyphosate, associated with three doses (0.00, 0.806 and 1.209 kg ha -1) of 2 , 4-D. In the second experiment the same doses of glyphosate were studied associated with three doses (0.0 4.0 and 8.0 g ha -1) of metsulfuron-methyl. Visual evaluations of plant poisoning, score number of plants with regrowth and dry matter of plants were determined. It was concluded that glyphosate applied alone or in association with 2.4-D or metsulfuron-methyl, regardless of the applied doses, was ineffective in the desiccation of mature plants of Crotalaria juncea.

Pulmonary and hepatic lesions caused by the dehydropyrrolizidine alkaloid-producing plants Crotalaria juncea and Crotalaria retusa in donkeys

The effects and susceptibility of donkeys to Crotalaria juncea and Crotalaria retusa poisoning were determined at high and low doses. Seeds of C. juncea containing 0.074% of dehydropyrrolizidine alkaloids (DHPAs) (isohemijunceines 0.05%, trichodesmine 0.016%, and junceine 0.008%) were administered to three donkeys at 0.3, 0.6 and 1g/kg body weight (g/kg) daily for 365 days. No clinical signs were observed and, on liver and lung biopsies, the only lesion was a mild liver megalocytosis in the donkeys ingesting 0.6 and 1g/kg/day. Two other donkeys that received daily doses of 3 and 5g seed/kg showed initial respiratory signs 70 and 40 days after the start of the administration, respectively. The donkeys were euthanized following severe respiratory signs and the main lung lesions were proliferation of Clara cells and interstitial fibrosis. Three donkeys ingested seeds of C. retusa containing 5.99% of monocrotaline at daily doses of 0.025, 0.05 and 0.1g/kg for 365 days. No clinical signs were observed and, on liver and lung biopsies, the only lesion was moderate liver megalocytosis in each of the three donkeys. One donkey that received a single dose of 5g/kg of C. retusa seeds and another that received 1g/kg daily for 7 days both showed severe clinical signs and died with diffuse centrilobular liver necrosis. No lung lesions were observed. Another donkey that received a single dose of 2.5g/kg of C. retusa seeds showed no clinical signs. The hepatic and pneumotoxic effects observed are consistent with an etiology involving DHPAs. Furthermore, the occurrence of lung or liver lesions correlates with the type of DHPAs contained in the seeds. Similarly as has been reported for horses, the data herein suggest that in donkeys some DHPAs are metabolized in the liver causing liver disease, whereas others are metabolized in the lung by Clara cells causing lung disease. © 2013 Elsevier Ltd.