Ambient has Become Strained. Identification of Acacia dealbata Link Volatiles Interfering with Germination and Early Growth of Native Species

Souza‐Alonso, Pablo; González, Luís; Cavaleiro, Carlos

doi:10.1007/s10886-014-0498-x

Cited by 24 publications

(23 citation statements)

References 41 publications

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“…Moreover, a recent study conducted in Northwest Spain showed that volatile organic compounds released from fresh flowers of A. dealbata inhibited germination and seedling growth of Trifolium subterraneum, Lolium multiflorum and Medicago sativa native to this region. [36] Other studies carried out in Northwest Spain and Italy have shown that A. dealbata has negative impacts on both native understorey plants and soil microbes, [11,12,20] although allelopathy was not directly implicated in these studies.…”

Section: Discussionmentioning

confidence: 73%

Effects and identification of chemical compounds released from the invasiveAcacia dealbataLink

Aguilera

Becerra

Villaseñor-Parada

et al. 2015

Chemistry and Ecology

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The invasion process of Acacia dealbata is partially mediated by releasing allelochemicals that affect native plants and soil microbes. However, non-volatile chemical compounds responsible for the allelopathic effect remain unknown, even though the allelopathic potential of this species has been studied under Europe conditions. We examined the allelopathic potential of aqueous extracts obtained from different plant materials of A. dealbata: litter from leaf, flowers, pods and seeds and fresh leaves and also litter extract's phytotoxicity evolution on germination and early seedling growth of Lactuca sativa L. Bioassays based on aqueous extracts and direct effect of plant materials showed that radicle length (RL), degree of root necrosis and germination percentage were the variables that gave the best prediction for assessing the inhibitory allelopathic effect. Chemical compounds present in all types of litter significantly reduced the hypocotyl and RL of L. sativa. GC-MS analysis reveals the presence predominantly of resorcinol, maculosin and moretenone in leaves; stigmasterol, d-alpha-tocopherol quinone, and lupanin in pods; and methyl p-anisate, p-anisyl alcohol, stigmasterol and anisal were identified in flowers. The inhibitory effect induced on L. sativa by the different plant parts supports the hypothesis that A. dealbata exerts its allelopathic potential throughout its phenological cycle.

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Section: Discussionmentioning

confidence: 73%

Effects and identification of chemical compounds released from the invasiveAcacia dealbataLink

Aguilera

Becerra

Villaseñor-Parada

et al. 2015

Chemistry and Ecology

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“…In this regard, a recent study conducted in the Northwest of Spain showed that volatile organic compounds released from fresh fl owers of A. dealbata inhibited germination and seedling growth of Trifolium subterraneum L., Lolium multifl orum Lam. and Medicago sativa L. native to the region (Souza-Alonso et al 2014). Moreover, in South America, some different nonvolatile compounds present in leaves, fl owers, pods and bark of A. dealbata have been identifi ed.…”

Section: Discussionmentioning

confidence: 99%

Is autotoxicity responsible for inhibition growth of new conspecific seedlings under the canopy of the invasive Acacia dealbata Link?

Aguilera¹,

Guedes²,

Becerra³

et al. 2017

Gayana Bot.

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Autotoxicity is a particular form of allelopathy and is suspected to be responsible for regulating intraspecific competition under the Acacia dealbata Link (Fabaceae) canopy. Was established a bioassay with controlled conditions following the natural patterns of plant material accumulation under the A. dealbata canopy to determine the effects of chemical compounds released by leaves, bark, flowers and pods of the invasive species on germination and early growth of conspecific seedlings. Morphological changes caused by A. dealbata plant parts in roots of A. dealbata seedlings grown in natural and controlled conditions were evaluated with scanning electron microscopy. The composition and behavior of the phytotoxicity of litter under the A. dealbata canopy throughout its phenological cycle were studied. The main chemical compounds in the soil under the canopy were identified. Most of the tested plant parts inhibited the germination and early seedling growth, prevented the root hair formation, destroyed the rhizodermis and altered the parenchyma tissue of radicles. The pods caused the greatest autotoxicity in seedlings from both study conditions and dominated the plant material accumulated under the canopy for almost all of the phenological cycle. Soil analysis by GC-MS revealed the abundance of fatty acids and the presence of steroids. These results suggest that A. dealbata can control the growth of new conspecific seedlings under its own canopy, and improves the interspecific competitive performance of its adult plants in its non-native range.

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“…, , ; Lorenzo and Rodríguez‐Echeverría ; Souza‐Alonso et al. ; Souza‐Alonso et al. 2014b, ; Aguilera et al.…”

Section: Introductionunclassified

“…The spreading of this transformer species has recently received great attention (Richardson et al 2000); strong impacts to community level of A. dealbata invasion have been documented in northwestern Spain and Chile (Lorenzo et al 2010;Fuentes et al 2013;Souza-Alonso et al 2014a;Souza-Alonso et al 2014b;Souza-Alonso et al 2015). It enhances nutrient mineralization and decomposition rates (Castro-D ıez et al 2012), modifies the soil microbial communities structure (Lorenzo et al 2010), decreases diversity and richness of invertebrate communities (Coetzee et al 2007), and reduces understory plant richness and diversity (Fuentes-Ramirez and Pauchard 2010;Gonz alez-Muñoz et al 2012;Lorenzo and Rodr ıguez-Echeverr ıa 2012).…”

Section: Introductionmentioning

confidence: 99%

“…data). Several studies report the phytotoxic effects of A. dealbata on native species and soil microorganisms (Lorenzo et al 2008(Lorenzo et al , 2010(Lorenzo et al , 2011Lorenzo and Rodr ıguez-Echeverr ıa 2012;Souza-Alonso et al 2014a;Souza-Alonso et al 2014bAguilera et al 2015), although only Souza-Alonso et al (2014a) refers to autotoxicity.…”

Section: Introductionmentioning

confidence: 99%

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DoesAcacia dealbataexpress shade tolerance inMediterranean forest ecosystems ofSouthAmerica?

Aguilera

Sanhueza

Guedes

et al. 2015

Ecology and Evolution

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The distribution of Acacia dealbata Link (Fabaceae) in its non-native range is associated with disturbed areas. However, the possibility that it can penetrate the native forest during the invasion process cannot be ruled out. This statement is supported by the fact that this species has been experimentally established successfully under the canopy of native forest. Nonetheless, it is unknown whether A. dealbata can express shade tolerance traits to help increase its invasive potential. We investigated the shade tolerance of A. dealbata under the canopy of two native forests and one non-native for three consecutive years, as well as its early growth and photosynthetic performance at low light intensities (9, 30, and 70 μmol m−2sec−1) under controlled conditions. We found many A. dealbata plants surviving and growing under the canopy of native and non-native forests. The number of plants of this invasive species remained almost constant under the canopy of native forests during the years of study. However, the largest number of A. dealbata plants was found under the canopy of non-native forest. In every case, the distribution pattern varied with a highest density of plants in forest edges decreasing progressively toward the inside. Germination and early growth of A. dealbata were slow but successful at three low light intensities tested under controlled conditions. For all tested light regimes, we observed that in this species, most of the energy was dissipated by photochemical processes, in accordance with the high photosynthetic rates that this plant showed, despite the really low light intensities under which it was grown. Our study reveals that A. dealbata expressed shade tolerance traits under the canopy of native and non-native forests. This behavior is supported by the efficient photosynthetic performance that A. dealbata showed at low light intensities. Therefore, these results suggest that Mediterranean forest ecosystems of South America can become progressively invaded by A. dealbata and provide a basis for estimating the possible impacts that this invasive species can cause in these ecosystems in a timescale.

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Ambient has Become Strained. Identification of Acacia dealbata Link Volatiles Interfering with Germination and Early Growth of Native Species

Cited by 24 publications

References 41 publications

Effects and identification of chemical compounds released from the invasiveAcacia dealbataLink

Effects and identification of chemical compounds released from the invasiveAcacia dealbataLink

Is autotoxicity responsible for inhibition growth of new conspecific seedlings under the canopy of the invasive Acacia dealbata Link?

DoesAcacia dealbataexpress shade tolerance inMediterranean forest ecosystems ofSouthAmerica?

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