Constituents of the root exudate of Avena fatua grown under far-infrared-enriched light

Pomilio, Alicia B.; Leicach, Silvia R.; Grass, Margarita Yaber; Ghersa, Claudio M.; Santoro, Mariana; Vitale, Arturo A.

doi:10.1002/1099-1565(200009/10)11:5<304::aid-pca531>3.0.co;2-g

Cited by 29 publications

(16 citation statements)

References 12 publications

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“…The DCM extracts of both the indigenous acacia and exotic bitou bush were the most inhibitory to all indigenous test species. Compounds soluble in DCM such as plant waxes, fatty acids, oils, sterols, terpenes and high molecular weight alkanes, are likely to occur in leaves (Yokouchi 1991), roots (Pomilio et al 2000) and vegetated soil (Franco et al 2000;Chefetz et al 2002;Lin et al 2007). Nonpolar compounds have the ability to regulate plant establishment (Langenheim 1994;Barney et al 2005;Nishida et al 2005), and are also known to have antimicrobial properties (Deans 1991;Karamanoli 2002;Scher et al 2004), which has ramifications for plant growth, particularly in low resource environments where plant-microbe mutualisms are common (Ernst 1985;Logan et al 1989;Abe and Ishikawa 1999).…”

Section: Discussionmentioning

confidence: 88%

Evidence for allelopathy as a mechanism of community composition change by an invasive exotic shrub, Chrysanthemoides monilifera spp. rotundata

2008

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Chemical interference is increasingly suggested as a mechanism facilitating exotic plant invasion and plant community composition. In order to explore this further, we employed a comprehensive extract-bioassay technique that facilitated detection and demarcation of phytotoxicity, direct allelopathy and indirect allelopathy of bitou bush (Chrysanthemoides monilifera spp. rotundata) compared to an indigenous dominant of the invaded system, acacia (Acacia longifolia var. sophorae). Extracts of the leaves and roots of both species exhibited phytotoxic effects against five indigenous plant species. Evidence for allelopathy between co-evolved indigenous plants was detected between acacia and Isolepis nodosa. Allelopathy between bitou bush and four indigenous plant species was also detected. Therefore we propose that both the acacia and bitou bush have the potential to chemically inhibit the establishment of indigenous plants. Eventual dominance of bitou bush is predicted, however, based on more ubiquitous effects on seedling growth.

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Section: Discussionmentioning

confidence: 88%

Evidence for allelopathy as a mechanism of community composition change by an invasive exotic shrub, Chrysanthemoides monilifera spp. rotundata

2008

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“…The impact of the weed control treatment on chemical compositions of soil organic C is shown in Table 3, Fig. 2C and D. The decreased aryl C and aromaticity may suggest that the C substrates in soil input from the decomposition of weed residue and root exudates in this plantation are mainly aromatic chemicals, which is consistent with the study of Pomilio et al (2000), who found aromatic chemicals are main components of plant root exudates.…”

Section: Effects Of Weed Control With Herbicide Application On Soil Cmentioning

confidence: 99%

Changes in soil carbon during the establishment of a hardwood plantation in subtropical Australia

Huang

Chen

et al. 2008

Forest Ecology and Management

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Soil carbon (C) pools are not only important to governing soil properties and nutrient cycling in forest ecosystems, but also play a critical role in global C cycling. Mulch and weed control treatments may alter soil C pools by changing organic matter inputs to the forest ecosystem. We studied the 12-month mulch and weed control responses on the chemical composition of soil organic C and the seasonal dynamics of water extractable organic C (WEOC), hot water extractable organic C (HWEOC), chloroform-released organic C (CHCl 3 -released C), and acid hydrolysed organic C (acid hydrolysable C) in a hardwood plantation of subtropical Australia. The results showed that compared with the non-mulch treatment, the mulch treatment significantly increased soil WEOC, HWEOC, and CHCl 3 -released C over the four sampling months. The weed control treatment significantly reduced the amount of HWEOC and CHCl 3 -released C compared with the no weed control treatment. Neither the mulch nor weed control treatment significantly affected soil acid hydrolysed organic C. There were no significant seasonal variations in soil WEOC, HWEOC, CHCl 3 -released C, and acid hydrolysed organic C in the hardwood plantation. Solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy was used to study the structural chemistry of soil C pools in hydrofluoric acid (HF) treated soils collected 12 months after the mulch and weed control treatments were applied. Overall, O-alkyl C was the dominant C fraction, accounting for 33-43% of the total NMR signal intensity. The mulch treatment led to higher signal intensity in the alkyl C spectral region and A/O-A ratio (the ratio of alkyl C region intensity to O-alkyl C region intensity), but lower signal intensity in the aryl C and aromaticity. Compared with the no weed control treatment, the weed control treatment reduced signal intensity in the aryl C and aromaticity. Together, shifts in the amount and nature of soil C following the mulch and weed control treatments may be due to the changes in organic matter input and soil physical environment. Crown

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“…El proceso en si depende en forma general de la especie de planta, 17 [164][165][166][167] Como se señalo, las raíces exudan una variedad importante de compuestos de, donde se incluyen azúcares y polisacáridos simples (tales como arabinosa, fructuosa, glucosa, maltosa, manosa y oligosacaridos), aminoácidos (tales como arginina, asparganina, cisterna y glutamina), ácidos orgánicos (tales como ácido acético, ascórbico, benzoico, ferúlico y málico) y compuestos fenólicos (Tabla 2), muchos de los cuales poseen actividades y funciones demostradas. [168][169][170] Dentro de los compuestos exudados con mayores pesos moleculares encontramos los flavonoides, enzimas, ácidos grasos, reguladores del crecimiento, esteroides, carbohidratos, alcaloides, poliacetilenos, etc.…”

Section: Composición Química De Los Exudados De La Raízunclassified

“…Dentro de la gran variabilidad de compuestos químicos aislados de los exudados de la raíz, muchos han mostrado actividades biológicas relevantes, incluso semejante a los mostrados por algunos agentes sintéticos tales como los herbicidas, 171 donde podemos citar α-tertienil, 172 artemisina, 173 sorgoleone, 174,175 momilactona A, 179 pisatin, 180 ω-metilsulfonilalquil isotiocianatos (tiosanatos), 181 desoxihemigosipol (terpenoides), 182 cineole, 183 (+)-α-bisabolol, 184 parteina, (+)-estrigol, 185,186 ginsenosides (saponinas), 187 7-Hidroxi-6-metoxicoumarina (escopeletin), 188 7-hidroxicumarina (umbelliferona), 189 y fenólicos simples en general (Figura 1). 48 Teniendo en cuenta esta diversidad estructural no es sorprendente que la investigación en el campo de la alelopatía este volcada hoy día hacia el estudio de los factores que pueden afectar la composición del compuestos liberados a través de los exudados, y todas las implicaciones que este hecho significa para la rizósfera 171 y por tanto, en la naturaleza de las interacciones planta-planta y planta-microorganismos.…”

Section: Compuestos Químicos En Los Exudados De La Raíz Con Potencialunclassified

Exudados de la raiz y su relevancia actual en las interacciones alelopaticas

Oliveros‐Bastidas¹,

Macías²,

Carrera³

et al. 2009

Quím. Nova

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Recebido em 21/2/08; aceito em 7/7/08; publicado na web em 2/12/08 ROOT EXUDATES AND THEIR RELEVANCE TO THE ALLELOPATIC INTERACTIONS. Detrimental interactions among plants are expressed by competition for nutrients, chemical interferences and/or parasitism. Root exudates have an enormous potential at the modulation of these three mechanisms. These exudates play a key role as "phytoalexins release routes", being the allelochemicals, which regulate the chemical interactions, an example. This review presents the most recent findings on the currently used methodologies for the study of the exudation phenomenon. The methodologies for the sampling and analysis of such chemicals, as well as all other factors considered to increase the production of root exudates, are also examined.. Keywords: exudate; root; allelopathy. introducciÓn El estudio de los mecanismos mediante los cuales las plantas pueden interaccionar con su entorno es muy complejo, 1-3 debido principalmente a la gran diversidad de estrategias que estas utilizan para tal fin. 4 Las plantas en si aprovechan todos sus órganos constitutivos para activar estos mecanismo y transmitir información a su entorno, siendo éstos específicos para cada órgano, y estos a su ves, son los que definirán el tipo de información transmitida. Así, los mecanismos que pueden ser activados en los órganos reproductivos, como la emisión de compuestos volátiles, 5-8 pueden ser muy diferentes a aquellos activados o acumulados en la raíz, 9-11 órgano de la planta encargado de la absorción de los requerimientos nutricionales esenciales para el crecimiento, 12 y el que se encuentra en contactos directo con el suelo, soporte de la población biótica y algunos factores abióticos del ambiente donde la planta se desarrolla.Todos estos mecanismos han sido perfeccionados evolutivamente, 13-15 y como característica heredada de la planta, su desarrollo y manifestación no sigue un plan prediseñado, y por el contrario, el mismo se encuentra siempre sujeto a constantes modificaciones que se expresan en una plasticidad adaptativa como consecuencia de su interacción con su medio ambiente.16 Es esta propiedad la que le ha conferida a las plantas una alta capacidad de adaptarse y soportar las más diversas condiciones, no solo de tipo física, sino a las generadas por agentes bióticos. En términos generales, los mecanismos de interacción de las plantas con su entorno, aplicados para lograr su supervivencia como objetivo fundamental, pueden ser divididos en dos grandes grupos según su naturaleza. Un primer grupo está representado por aquellos mecanismos de tipo físico y de arquitectura de la planta, donde pueden incluirse características de velocidad de crecimiento, rasgos anatómicos de la hoja y el tallo, dormancia a largo tiempo y condiciones de sus cariópsides, mecanismo de reproducción, modos duales de reproducción, plasticidad ambiental, resistencia a condiciones adeversas, la germinación no requiere condiciones especiales, rápida reposición de organos perdidos, capacidad de desarrollar resistencia ...

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Constituents of the root exudate of Avena fatua grown under far-infrared-enriched light

Cited by 29 publications

References 12 publications

Evidence for allelopathy as a mechanism of community composition change by an invasive exotic shrub, Chrysanthemoides monilifera spp. rotundata

Evidence for allelopathy as a mechanism of community composition change by an invasive exotic shrub, Chrysanthemoides monilifera spp. rotundata

Changes in soil carbon during the establishment of a hardwood plantation in subtropical Australia

Exudados de la raiz y su relevancia actual en las interacciones alelopaticas

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