<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2301-1548</journal-id>
<journal-title><![CDATA[Agrociencia (Uruguay)]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia Uruguay]]></abbrev-journal-title>
<issn>2301-1548</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2301-15482020000402303</article-id>
<article-id pub-id-type="doi">10.31285/agro.24.423</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluation of the phytotoxic effect of extracts from endophytic fungi Colletotrichum dianesei and Xylaria sp. isolated from Palicourea corymbifera (Rubiaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación del efecto fitotóxico de extractos de los hongos endofíticos Colletotrichum dianesei y Xylaria sp. aislados de Palicourea corymbifera (Rubiaceae)]]></article-title>
<article-title xml:lang="pt"><![CDATA[Avaliação do efeito fitotóxico dos extratos dos fungos endofíticos Colletotrichum dianesei e Xylaria sp. isolados de Palicourea corymbifera (Rubiaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[W. L. Da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lima]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nunez]]></surname>
<given-names><![CDATA[C. V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Pesquisas da Amazônia (INPA) Coordenação de Tecnologia e Inovação (COTI) Laboratório de Bioprospecção e Biotecno-logia (LABB)]]></institution>
<addr-line><![CDATA[Manaus Amazonas]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>spe2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482020000402303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482020000402303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482020000402303&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The allelopathic action can be verified by the presence of phytotoxic substances, molecules that are directed to the agribusiness sector. The objective of this study was to evaluate the chemical composition of the methanolic extracts from Colletotrichum dianesei and Xylaria sp., and phytotoxic potential on Lactuca sativa. The fungi were grown in Sabouraud liquid medium supplemented with 0.2% yeast extract, under stirring. The mycelia were subjected to solvent extraction in order of increasing polarity, but methanol extracts were used in this investigation. The allelopathic activity was evaluated at a concentration of 1000 µg/mL in quadruplicate, evaluating: percentage and speed of germination, and growth of lettuce seedlings under laboratory conditions. C. dianesei extract reduced germination percentage by 36% and delayed germination speed by 63.8%, while Xylaria sp. didn't interfere with the germination percentage, it only delayed the germination rate by 43.9%. Root growth was negatively affected in 30.5% and 51.1% under the influence of extracts from Xylaria sp. and C. dianesei, there was also a reduction of 33.1 and 31.8% in the aerial part length, respectively. The thin layer chromatography showed the presence of aromatic substances and terpenes in both extracts, and alkaloids only in C. dianesei extract. The 1H nmr spectra showed signals between 6 and 8.5 ppm (aromatic substances), being relatively more intense for Xylaria sp., signals between 3 and 4 ppm (sugars, showing anomers only for Xylaria sp.) and methyl groups between 0.7 and 1.3 ppm, suggesting terpenes. The results suggest that the fungal species evaluated have phytotoxic potential, and produce terpenes and aromatic substances.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La acción alelopática puede verificarse por la presencia de sustancias fitotóxicas, moléculas que están dirigidas al sector agroindustrial. El objetivo de este trabajo fue evaluar la composición química de los extractos metanólicos de Colletotrichum dianesei y Xylaria sp. y su potencial fitotóxico sobre Lactuca sativa. Los hongos se cultivaron en medio líquido Sabouraud suplementado con extracto de levadura al 0,2 %, en agitación. Los micelios se sometieron a extracción con disolventes en orden de polaridad creciente, pero en esta investigación se usaron los extractos metanólicos. La actividad alelopática de los mismos se evaluó a una concentración de 1000 µg/mL en cuadruplicado, evaluando: porcentaje y velocidad de germinación y crecimiento de plántulas de lechuga en condiciones de laboratorio. El extracto de C. dianesei redujo el porcentaje de la germinación en un 36 % y retrasó la velocidad de germinación en un 63,8 %, mientras que el extracto de Xylaria sp. no interfirió en el porcentaje de germinación, solamente retrasó en 43,9 % la velocidad de germinación. El crecimiento de las raíces se vio afectado negativamente en 30,5 % y 51,1 % bajo la influencia de los extractos de Xylaria sp. y C. dianesei; también hubo una reducción en la longitud de la parte aérea de 33,1 y 31,8 %, respectivamente. Las Cromatografías en capa fina mostraron la presencia de sustancias aromáticas y terpenos para ambos extractos, y alcaloides solo para el extracto de C. dianesei. Los espectros de rmn de 1H mostraron señales entre 6 y 8,5 ppm (sustancias aromáticas), siendo relativamente más intensas para Xylaria sp., señales entre 3 y 4 ppm (azúcares, mostrando los anómericos solo para Xylaria sp.) y grupos metilas entre 0,7 y 1,3 ppm, sugiriendo terpenos. Los resultados sugieren que las especies de hongos evaluadas tienen potencial fitotóxico y producen terpenos y sustancias aromáticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: A ação alelopática pode ser verificada pela presença de substâncias fitotóxicas, moléculas que são direcionadas ao setor agroindustrial. O objetivo deste trabalho foi avaliar a composição química dos extratos metanólicos de Colletotrichum dianesei e Xylaria sp. e seu potencial fitotóxico sobre Lactuca sativa. Os cogumelos foram cultivados em meio líquido Sabouraud suplementado com 0,2% de extrato de levedura, sob agitação. Os micélios foram submetidos à extração por solvente em ordem crescente de polaridade, mas apenas os extratos metanólicos foram utilizados nesta investigação. A atividade alelopática foi avaliada na concentração de 1000 &#956;g/mL em quadruplicado, avaliando-se: porcentagem e velocidade de germinação e crescimento de mudas de alface em condições de laboratório. O extrato de C. dianesei reduziu a porcentagem de germinação em 36% e atrasou a velocidade de germinação em 63,8%, enquanto a Xylaria sp. não interferiu na porcentagem de germinação, apenas atrasou a velocidade de germinação em 43,9%. O crescimento radicular foi negativamente afetado em 30,5% e 51,1% sob a influência dos extratos de Xylaria sp. e C. dianesei; também houve redução no comprimento da parte aérea de 33,1 e 31,8%, respectivamente. As cromatografias em camada delgada mostraram a presença de substâncias aromáticas e terpenos para ambos os extratos, e alcaloides apenas para o extrato de C. dianesei. Os espectros de RMN de 1H mostraram sinais entre 6 e 8,5 ppm (substâncias aromáticas), sendo relativamente mais intensos para Xylaria sp., sinais entre 3 e 4 ppm (açúcares, mostrando os hidrogênios anoméricos apenas para Xylaria sp.) e grupos metila entre 0,7 e 1,3 ppm, sugerindo terpenos. Os resultados sugerem que as espécies fúngicas avaliadas possuem potencial fitotóxico e produzem terpenos e substâncias aromáticas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[phytotoxicity]]></kwd>
<kwd lng="en"><![CDATA[bioprospecting]]></kwd>
<kwd lng="en"><![CDATA[endophytic]]></kwd>
<kwd lng="es"><![CDATA[fitotoxicidad]]></kwd>
<kwd lng="es"><![CDATA[bioprospección]]></kwd>
<kwd lng="es"><![CDATA[endófitos]]></kwd>
<kwd lng="pt"><![CDATA[fitotoxicidade]]></kwd>
<kwd lng="pt"><![CDATA[bioprospecção]]></kwd>
<kwd lng="pt"><![CDATA[endófitos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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