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Souto, X. Carlos; Chiapusio, Geneviève; Pellissier, François

doi:10.1023/a:1005504029243

Cited by 79 publications

(11 citation statements)

References 35 publications

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“…Initially, the soil microorganisms could have consumed C-sources that are more readily available such as sugars [42,43]. As the decomposition of the plant material progressed, they could also have used part of the released allelochemicals as C-sources [44], thus being implied in the allelopathic processes by metabolizing, inactivating, or giving rise to other bioactive compounds [24].…”

Section: Discussionmentioning

confidence: 99%

The Phytotoxic Potential of the Flowering Foliage of Gorse (Ulex europaeus) and Scotch Broom (Cytisus scoparius), as Pre-Emergent Weed Control in Maize in a Glasshouse Pot Experiment

Pardo-Muras

Puig

Souza‐Alonso

et al. 2020

Plants

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In our previous studies, the phytotoxicity of Ulex europaeus (gorse) and Cytisus scoparius (Scotch broom) was demonstrated in vitro and argued to be caused by the release of volatile and water-soluble compounds from fresh plant foliage. In light of these positive results, there was a need to test the effects ex vitro. In this work, gorse and Scotch broom were used as soil amendments in pot experiments in a glasshouse by incorporating slashed plant material into the soil at a ratio of 1% w/w on a dry mass basis. The phytotoxic effects on the emergence and early growth of maize and five accompanying weed species were analyzed, as were the effect on soil fertility and soil community-level physiological profiles. Thirty days after incorporation, significant decreases in weed density of 32.2% and 59.5% were found for gorse and Scotch broom soil amendments, respectively. Gorse soil amendment was notably effective impairing the establishment of Amaranthus retroflexus and diminishing the plant height of Digitaria sanguinalis and Portulaca oleracea. Scotch broom soil amendment was capable of significantly inhibiting the emergence of D. sanguinalis, Convolvulus arvensis, P. oleracea, and A. retroflexus, with a notable reduction of weed biomass. No undesirable side effects on maize crop or soil quality, including microbial activity, were detected. Our results suggest that the incorporation of gorse and Scotch broom foliage is promising for pre-emergent weed control in maize; however, field trials that support and expand these glasshouse results are essential.

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Section: Discussionmentioning

confidence: 99%

The Phytotoxic Potential of the Flowering Foliage of Gorse (Ulex europaeus) and Scotch Broom (Cytisus scoparius), as Pre-Emergent Weed Control in Maize in a Glasshouse Pot Experiment

Pardo-Muras

Puig

Souza‐Alonso

et al. 2020

Plants

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“…However, phenolic compounds (secondary metabolites) produced by plants play an important role in the interaction of vegetation with its environment (Hättenschwiler and Vitousek 2000;Chiapusio et al 2005). For example, in humus spruce forests, such compounds are implicated in the increase of several microbial communities (i.e., cellulose hydrolysers) and in the decrease of others (i.e., bacteria) (Souto et al 2000(Souto et al , 2001. Some studies have addressed phenolic production by Sphagnum (e.g., Rasmussen et al 1995), more specifically the phenolics weakly and primarily bound to the cell wall (Verhoeven and Liefveld 1997).…”

Section: Introductionmentioning

confidence: 99%

Effect of a temperature gradient on Sphagnum fallax and its associated living microbial communities: a study under controlled conditions

et al. 2011

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Microbial communities living in Sphagnum are known to constitute early indicators of ecosystem disturbances, but little is known about their response (including their trophic relationships) to climate change. A microcosm experiment was designed to test the effects of a temperature gradient (15, 20, and 25°C) on microbial communities including different trophic groups (primary producers, decomposers, and unicellular predators) in Sphagnum segments (0-3 cm and 3-6 cm of the capitulum). Relationships between microbial communities and abiotic factors (pH, conductivity, temperature, and polyphenols) were also studied. The density and the biomass of testate amoebae in Sphagnum upper segments increased and their community structure changed in heated treatments. The biomass of testate amoebae was linked to the biomass of bacteria and to the total biomass of other groups added and, thus, suggests that indirect effects on the food web structure occurred. Redundancy analysis revealed that microbial assemblages differed strongly in Sphagnum upper segments along a temperature gradient in relation to abiotic factors. The sensitivity of these assemblages made them interesting indicators of climate change. Phenolic compounds represented an important explicative factor in microbial assemblages and outlined the potential direct and (or) indirect effects of phenolics on microbial communities.

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“…However, ambient airdrying exhibited a significant decrease in TPC despite having nearly 100% of its oxidase enzyme deactivated. This could be due to the prolonged period of ambient air-drying (three days) which would allow microorganism in ambient air to act on the phenolics before the leaves achieving the optimum dryness (Ahn et al, 2003;Peters, 1990;Souto, Chiapusio, & Pellissier, 2000).…”

Section: Role Of Thermal Stability and Oxidase Enzyme Activitymentioning

confidence: 99%

Approach to preserve phenolics inThunbergia laurifolialeaves by different drying treatments

Siow

Lim

2019

J Food Biochem

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Different drying methods and blanching were investigated as to their effects on antioxidant and oxidase activities of Thunbergia laurifolia leaves. Results showed that oven‐drying had the highest degradation of total phenolic content (TPC) and antioxidant activity at >85%, while freeze‐drying had the lowest at <20%. However, inactivation of oxidase enzymes by blanching at 100°C resulted in a lesser decrease in TPC for oven‐drying at 50 and 100°C (51% and 65%, respectively), indicating the importance of inactivating the oxidase enzymes for lower degradation of phenolics on drying. The high‐performance liquid chromatography analysis showed that its major antioxidant, rosmarinic acid, degraded tremendously in the presence of oxidase enzymes, but only degraded slightly upon inactivation of oxidase enzymes. Hence, this work showed that by controlling the enzymatic activity, the preservation of phenolics with specific bioactivity in herbal tea leaves can be achieved. Practical applications Thunbergia laurifolia leaves have been frequently consumed in the form of a tea or pill due to its medicinal properties. Processing of fresh herbal plant leaves by drying is required to preserve antioxidant phenolic compounds and quality of the plant leaves. Although the drying effects on the antioxidant properties have been studied, the factors that cause the change in properties have not been investigated in‐depth. Controlling the factors that affect the phenolic content can help to preserve the beneficial antioxidants when processing the leaves by drying. The result of this study will be of relevance and beneficial to the herbal tea industry.

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Untitled

Cited by 79 publications

References 35 publications

The Phytotoxic Potential of the Flowering Foliage of Gorse (Ulex europaeus) and Scotch Broom (Cytisus scoparius), as Pre-Emergent Weed Control in Maize in a Glasshouse Pot Experiment

The Phytotoxic Potential of the Flowering Foliage of Gorse (Ulex europaeus) and Scotch Broom (Cytisus scoparius), as Pre-Emergent Weed Control in Maize in a Glasshouse Pot Experiment

Effect of a temperature gradient on Sphagnum fallax and its associated living microbial communities: a study under controlled conditions

Approach to preserve phenolics inThunbergia laurifolialeaves by different drying treatments

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