Biological Potential of Extracts of Caatinga Plants in the Control of Alternaria alternata f. sp. citri in Citrus

Abstract

In Brazil the Caatinga biome is formed by endemic species with numerous applications in medicine, cosmetics and agrochemicals. However, only 8% of the country’s plant species are chemically evaluated annually. Thus, the work aimed to determine the free amino acid composition and phenolic substances of Caatinga plant species extracts, their antioxidant activity and the potential use of these compounds in the control of A. alternata in citrus. Leaf extracts from fourteen native plant species were evaluated for free amino acid contents; total and individual polyphenols; total flavonoids and antifungal susceptibility test. The relationship between the contents of the compounds detected in each plant extract with its antioxidant capacity and antifungal activity, has not yet been fully clarified. However, it is a fact that the extract of Cleome hassleriana constitutes a source rich in free amino acids. It is also verified that the extracts of Mimosa tenuiflora and Caesalpinia ferrea are efficient alternatives in the control of Alternaria alternata in citrus, because they present similar results for this purpose, and in the evaluation of their compositions in free amino acids, phenolic substances and antioxidant activity.

Extratos aquosos de plantas nativas com potencial uso no manejo da murcha bacteriana do tomateiro Ralstonia solanacearum (Smith 1896) Yabuuchi et al. 1996

“…Em estudos conduzidos com o patógeno de solo Phytium sp., o extrato de mussambê demonstrou potencialidade, diminuindo a severidade da doença (Lazzeri e Manici, 2001), bem como o crescimento micelial de Alternaria alternata, quando utilizado o extrato etanólico (Pinto et al, 2018).…”

“…Foi descrito como resultado de caracterização fitoquímica do extrato o metabolitos saponinas, taninos, cumarinas e alcaloides (Sousa et al, 2018). Em estudo agronômico realizado in vitro avaliando atividade antifúngica do extrato etanólico de Z. joazeiro frente a Alternaria alternata não houve inibição do crescimento micelial nas doses avaliadas (Pinto et al, 2018). Sampaio et al (2017) avaliando o potencial antimicrobiano in vitro de extrato de quixabeira S. obtusifolium contra bactérias patogênicas ao homem e sua composição química, verificaram que a presença de flavonoides, fenóis e taninos, compostos importantes para a defesa vegetal e que podem estar associados a atividade antimicrobiana contra uma série de patógenos.…”

“…A quixabeira é utilizada na medicina popular por seu efeito anti-inflamatório e sua atividade antioxidante (Odontuya et al, 2005). Leite et al (2015) já relatou a presença de flavonoides e terpenóides neste vegetal, bem como alguns polifenóis (ácido gálico, quercetina, kaemferol, ácido ferúlico) (Pinto et al, 2018). Todos estes compostos desempenham importantes funções na defesa vegetal contra a fitopatógenos.…”

Effect of breed on meat quality and global acceptance of native lambs and their crosses

“…It is contented that this result is due not only to the breed effect, but also to the semi-extensive management system of natural pastures containing mixed browse/shrubs and grasses (Lourenço et al, 2007). The caatinga plant secondary metabolites affect the PUFA profile as their presence culminates in higher duodenal flow rate compared with forage without these secondary metabolites (Fraser et al, 2004;Pinto et al, 2018). Higher intake of linoleic acid (an essential FA) may protect against ischemic stroke, possibly through potential mechanisms of decreased blood pressure, reduced platelet aggregation, and enhanced deformability of erythrocyte cells (Iso et al, 2002;Calder, 2015).…”