Inconsistency in the detection of phytotoxic effects: A test with Acacia dealbata extracts using two different methods

Lorenzo, Paula; Reboredo-Durán, Jonatan; Múñoz, Luís; González, Luís; Freitas, Helena; Rodríguez‐Echeverría, Susana

doi:10.1016/j.phytol.2015.11.001

Cited by 13 publications

(23 citation statements)

References 34 publications

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“…In general, these plants, when treated with the bark extract, showed increased growth and biomass compared to untreated plants. These results agree with previous findings of a positive effect of bark solutions from A. dealbata on the growth of Lactuca sativa seedlings . The increased plant biomass observed for onion plants sprayed with bark extract might be related to the lower EC found in soils where they were grown compared to the higher EC in soils where untreated plants were grown.…”

Section: Discussionsupporting

confidence: 59%

“…Fresh bark of A. dealbata was collected from 28 individual trees in two populations surrounding the University of Vigo in May 2013 (NW Spain; 40° 09′ 00.33″ N 8° 39′ 41.21″ W; 40° 06′ 25.33″ N 8° 39′ 35.71″ W). The extraction procedure was conducted according to Lorenzo et al Plant material from both populations was pooled, cut into 10‐cm long pieces, and thoroughly mixed and processed within the same day of collection. Six kg of bark pieces were distributed equally in Erlenmeyer flasks (2 L), covered with a mixture of methanol/distilled water (97:3, v:v) solution, and maintained in the dark at room temperature for 9 weeks.…”

Section: Methodsmentioning

confidence: 99%

“…Although bark compounds of A. dealbata do not present evident toxic characteristics, the toxicity of methanolic‐extracted bark compounds has not been previously explored. Considering the potential biostimulant effect, and to avoid possible toxicity in edible parts, onion plants ( Allium cepa L.) were chosen to conduct the experiment because bark extracts could be sprayed directly onto the leaves (non‐edible parts), while bulbs (edible parts) remained in the soil.…”

Section: Methodsmentioning

confidence: 99%

“…A. dealbata also produces and releases allelopathic and/or phytotoxic molecules that interfere with the normal functioning of plants and soil microorganisms . Plant extracts, mulches, or green manures obtained from allelopathic/phytotoxic plant material could be used as a source of natural herbicides in agriculture .…”

Section: Introductionmentioning

confidence: 99%

“…dealbata also produces and releases allelopathic and/or phytotoxic molecules that interfere with the normal functioning of plants and soil microorganisms. [24][25][26][27][28]16 Plant extracts, mulches, or green manures obtained from allelopathic/phytotoxic plant material could be used as a source of natural herbicides in agriculture. [29][30][31] The potential herbicidal effect of green manures and mulches based on A. dealbata waste material has been recently assessed on accompanying weeds in maize crops.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Acacia dealbata Link bark extracts on the growth of Allium cepa L. plants under high salinity conditions

et al. 2019

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BACKGROUND Acacia dealbata Link is an invasive plant worldwide. Finding potential uses for its waste that contribute to controling its spread and result in benefits for agriculture has recently become a new topic of research. This study aimed to evaluate the potential biostimulant effect of bark extract derived from the management of A. dealbata (0, 450 or 900 ppm) on onion plants growing under stressful conditions, such as in soils treated with saline solutions (0, 60 or 120 mmol L−1 NaCl) and with reduced irrigation (100%, 50% or 25%). RESULTS A. dealbata Link bark extract significantly increased height as well as leaf, root and total biomass of plants in soils irrigated with NaCl solution (120 mmol L−1). These plants also had a higher content of Cl in roots, but a lower content of P in leaves and of K in bulbs. The 450 ppm bark treatment additionally increased the protein content in leaves and decreased the Na and Mg content in bulbs and bulbs and roots, respectively. The bark extract also increased the sugar content in plants under saline conditions. However, the effect of bark extract was negligible on plants that grew under drought stress. CONCLUSION Results revealed that the bark extract might attenuate stress effects in plants growing at high salinity levels, probably by increasing their sugar and protein content and via the accumulation of ions in the roots. Although additional experiments are required, we suggest that the bark extract of A. dealbata has potential applications in agriculture concerned with biostimulant formulations. © 2019 Society of Chemical Industry

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Section: Discussionsupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Acacia dealbata Link bark extracts on the growth of Allium cepa L. plants under high salinity conditions

et al. 2019

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Effect of plant origin and phenological stage on the allelopathic activity of the invasive species Oxalis pes‐caprae

Lorenzo¹,

González

Ferrero³

2021

American J of Botany

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PREMISE Invasion processes involve several mechanisms, some of which have received little attention. Allelopathy has been invoked as an invasion driver according to the novel weapon hypothesis (NWH), and polyploidization can also be an important factor for invasion success. However, very few studies have addressed both topics together. We analyzed the allelopathic effect of the polyploid Oxalis pes‐caprae, an invader in mediterranean‐climate areas worldwide, from different origins and ploidy levels (native: South Africa; invaded: Chile, Australia, California, and the Mediterranean Basin) on Lactuca sativa as a model species. METHODS We measured seed germination, initial plant height, and aboveground and belowground biomass of Lactuca grown in field soil mixed with Oxalis material and with or without activated carbon in a common garden experiment. We performed the experiment twice, when Oxalis was vigorous and when senescent. RESULTS Vigorous plants of Oxalis tended to reduce Lactuca germination, but both vigorous and senescent Oxalis plants increased Lactuca biomass, probably due to an increase in nutrients provided by plant material. The highest increase in Lactuca traits occurred with Oxalis plants from the Iberian Peninsula. Allelopathy only happened when Oxalis was senescent and was especially strong with plants from Chile. CONCLUSIONS Although we did not find broad evidence for the NWH considering all areas together, we reported differences in the allelopathic potential of Oxalis plants depending on their origin. These results highlight the independent evolution of invasiveness traits in distant introduced ranges and the importance of the invaders’ origin when testing hypotheses about invasion drivers.

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Here to stay. Recent advances and perspectives about Acacia invasion in Mediterranean areas

Souza‐Alonso

Rodríguez

González

et al. 2017

Annals of Forest Science

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Key message The above-and belowground impacts due to Acacia invasions have been described in detail over the last 25 years. Future research should focus on the early detection and prevention of new Acacia introductions and on a cost-effective and sustainable management of the novel ecosystems resulting from invasions.• Context Invasive alien plants (IAPs) strongly alter ecosystems reducing biodiversity, modifying ecosystem services and increasing negative impacts at social and economic level. Among invasive taxa, Acacia is a highly problematic genus worldwide. In fact, almost 500 papers have been published on several aspects of Acacia invasions for the last 25 years.• Aims We aim at reviewing the current knowledge on the consequences of the invasion by Acacia genus in Mediterranean ecosystems. We also collect and propose different approaches for the management and recovery of invaded areas and suggest future perspectives on Acacia research. • Methods We compile, summarise and discuss recent findings on physicochemical, ecological, microbiological and socioeconomic aspects of invasion related to Australian acacias (Acacia dealbata, Acacia longifolia, Acacia mearnsii, Acacia saligna and Acacia melanoxylon) focusing on Mediterranean areas.• Results Acacia invasion generally entails soil physicochemical alterations and changes in microbial function and structure. Consequences such as the decreased biodiversity, altered ecosystem structure, larger seed banks dominated by invasive species, new biotrophic relationships or alterations in water availability and fire regimes suggest that acacias are locally creating novel ecosystems.• Conclusions Forecasting invasions, modelling and managing ecosystems dominated by acacias are challenging tasks that should be addressed in the future, since climatic conditions and intensification in land uses are increasing the likelihood of Acacia invasions in Mediterranean areas. Unsuccessful management actions suggest that restoration should be meticulously monitored, but the magnitude of invasion or the inconsistency of economic investment indicate that eradication is often unfeasible. Alternatively, novel integrative and cost-effective solutions including the collaboration of society, politicians and stakeholders are necessary to prevent new introductions and achieve sustainable control of acacias. There is a growing interest in applied research on the valorisation or novel uses for acacias and their residues that result in economic benefits.

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Inconsistency in the detection of phytotoxic effects: A test with Acacia dealbata extracts using two different methods

Cited by 13 publications

References 34 publications

Influence of Acacia dealbata Link bark extracts on the growth of Allium cepa L. plants under high salinity conditions

Influence of Acacia dealbata Link bark extracts on the growth of Allium cepa L. plants under high salinity conditions

Effect of plant origin and phenological stage on the allelopathic activity of the invasive species Oxalis pes‐caprae

Here to stay. Recent advances and perspectives about Acacia invasion in Mediterranean areas

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