5-hydroxy-l-tryptophan; taxonomic character and chemical defence in Griffonia

Bell, E. A.; Fellows, Linda E.; Qureshi, M.Yasin

doi:10.1016/s0031-9422(00)94461-3

Cited by 15 publications

(5 citation statements)

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“…Aparentemente, quando as sementes apresentam maior atividade alelopática em relação às demais frações da planta (folha, colmo, raízes e outras), muito provavelmente os resultados estão associados a um aminoácido não proteico, como é o caso da mimosina, nas leucenas. É importante salientar que, especialmente em sementes de leguminosas, pode ocorrer acú-mulo impressionante de aminoácidos não proteicos, que pode chegar a 14% do peso das sementes, como é o caso do aminoácido 5-hidroxi-L-triptofano em Griffonia simplicifolia (Bell et al, 1976).…”

Section: Análise Da Atividade Alelopática Em Sementesunclassified

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

Filho¹,

Trezzi

Ioue³

2011

Planta daninha

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4RESUMO -Na literatura mundial, observa-se predominância das folhas como meio preferencial de estudos de compostos químicos promissores, embora informações sobre outras frações da planta também sejam encontradas. Essa tendência se deve ao fato de que a maioria dos estudos mostra as folhas com atividade potencialmente alelopática de intensidade superior à das demais frações. Nesta revisão, procurou-se compilar e analisar as informações disponíveis sobre a importância das sementes como fonte alternativa de compostos químicos com atividade alelopática. São discutidas as variações na produção e na alocação de aleloquímicos em função do estádio ontogenético das sementes presentes no banco de sementes. É discutido também o papel dos aleloquímicos produzidos por sementes na repelência de insetos, na inibição do desenvolvimento de patógenos nas sementes, na inibição do desenvolvimento inicial de plantas daninhas e como sinalizador positivo para a simbiose com microrganismos do solo. Apresenta-se ainda a atividade alelopática de diversas substâncias isoladas de sementes, destacando-se os alcaloides, flavonoides, benzoxazinoides e resinas glicosídicas. Os estudos de aleloquímicos produzidos por sementes podem contribuir expressivamente para o melhor entendimento do papel ecológico que essas substâncias desempenham na ecologia química dos agro e ecossistemas.Palavras-chave: aleloquímicos, função nas sementes, repelência de insetos, inibição de plantas daninhas, inibição de patógenos.ABSTRACT -In the literature, leaves predominate as preferred source of studies of promising allelopathic compounds, but information on other plant fractions are also found. This trend is due to the fact that most studies show that leaves have higher allelopathic potential than other plant fractions.In this review, we compiled and analyzed the information available on the importance of seeds as an alternative source of chemical compounds with allelopathic activity. We discussed the variations in production and allocation of allelochemicals at different ontogenetic stages of the seeds in the seed bank. The role played by the allelochemicals produced by the seeds on insect repellency, inhibition of the development of pathogens in seeds, initial development of competing plants and as positive signaling for the symbiosis with soil microbes were also studied. The allelopathic activity of several compounds isolated from the seeds was presented, especially alkaloids, flavonoids, resins, and benzoxazinoid glucosides. Studies of allelochemicals produced by the seeds can contribute significantly to a better understanding of the ecological role they play in the chemical ecology of agro-ecosystems and ecosystems.

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Section: Análise Da Atividade Alelopática Em Sementesunclassified

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

Filho¹,

Trezzi

Ioue³

2011

Planta daninha

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“…This distinction is not always clear however. For example l - 5-hydroxytryptophan, the precursor of 5-hydroxytryptamine (serotonin) in the human brain, has a secondary storage role in seeds of Griffonia species, where it can account for as much as 14% of the dry seed weight ( , ). Similarly, l -3,4-dihydroxyphenylalanine ( l -DOPA), which serves as a precursor of dopamine in the brain, and has been used as a drug in the treatment of Parkinson's disease, constitutes 6−9% of the dry seed weight of Mucuna species ( Figure ).…”

Section: Introductionmentioning

confidence: 99%

Nonprotein Amino Acids of Plants: Significance in Medicine, Nutrition, and Agriculture

Bell

2003

J. Agric. Food Chem.

152

107

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Those nonprotein amino acids found in food and fodder plants and known to be toxic to man and domestic animals are described. These include toxins from many legume genera including Lathyrus, from other higher plant families, from seaweeds, and from fungi. Some inhibit protein synthesis, while others are incorporated into proteins with toxic effects. Basic processes such as urea synthesis and neurotransmission may be disrupted. The probable roles of nonprotein amino acids in protecting plants against predators, pathogens, and competing plant species are considered. The need to learn more of the nutritive value of nontoxic nonprotein amino acids and to explore the potential of others either as drugs or as leads to drugs in human and veterinary medicine is emphasized.

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“…Subsequently, seed of two of the other three species in this small genus (G. physocarpa and G. speciosa) were obtained and they too contained high concentrations of 5-HTP (57). In marked contrast to the traces of 5-HTP detected in other plant and animal tissues, 20 individual seeds of G. simplicifolia collected in Nigeria contained no less than 14.0% (mean value, dry weight) of 5-HTP [62].…”

Section: -Hydroxytryptophanmentioning

confidence: 99%

Non-Protein Amino Acids: A Review of the Biosynthesis and Taxonomic Significance

Bell¹,

Nash

Watson

2008

Natural Product Communications

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The non-protein amino acids, with which we are concerned here, are not incorporated into the proteins of the organisms that synthesize them nor are their residues formed by the post-translational modification of protein amino acid residues. Nonprotein amino acids are of value in the study of relationships between species and higher taxa of organisms because most of them are of restricted distribution. If a particular non-protein amino acid is only known to occur in a limited group of species which are related in other respects then it is probable that these species have all arisen from a common ancestral form in which the biosynthetic pathway to that particular non-protein amino acid already existed.

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5-hydroxy-l-tryptophan; taxonomic character and chemical defence in Griffonia

Cited by 15 publications

References 0 publications

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

Nonprotein Amino Acids of Plants: Significance in Medicine, Nutrition, and Agriculture

Non-Protein Amino Acids: A Review of the Biosynthesis and Taxonomic Significance

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