Allelopathy and allelochemicals from microalgae: An innovative source for bio-herbicidal compounds and biocontrol research

Chaïb, Slimane; Pistevos, Jennifer C. A.; Bertrand, Cédric; Bonnard, Isabelle

doi:10.1016/j.algal.2021.102213

Cited by 40 publications

(30 citation statements)

References 174 publications

(225 reference statements)

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“…Detected morphologies are also seen in other Chlorophyceae [43], and as previously described by Přibyl [29], no motile cells were found in dark conditions due to their asexual reproduction by autospores. Many microalga metabolites have been described so far, most of them allelochemicals [13,14], which give them relevant advantages. These compounds have effects on reproduction, survival and in inhibiting the growth of competitive species, and maybe this is the reason why the initial culture, in the mosquito breeding site, was almost a monoalgal culture.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, we observed rupture of the N. aquatica cell walls, with increasing damage as the volume of larval midgut extract was added and the incubation time increased. This result strongly suggests lytic activity of the larval extract that could lead to the release of alga components that could have a toxic effect on the growth and development of mosquito larvae (Fig 9 ), indicating that at least some N. aquatica forms, could produce bioactive compounds [13,14,53]. Mosquito larvae that ingest alga cells do not achieve normal development, and this damage is not completely reversed when supplementing the diet with a diet rich in nutrients, confirming that the effect produced is not due to a poor diet.…”

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 92%

“…A group of frequent microorganisms in mosquito breeding sites with high organic load are microalgae, capable of producing bioactive metabolites, such as allelochemicals, which can confer competitive advantages, such as effects on survival, reproduction or inhibition of the growth of competing species in aquatic ecosystems. For that, microalgae are considered a source of new antimicrobial agents and potential bioherbicide and biological control agents [13]. For example, species such as Amphora coffeaeformis or Scenedesmus obliquus have been toxic against Cx.…”

Section: Introductionmentioning

confidence: 99%

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Culex quinquefasciatus larvae development arrested when fed on Neochloris aquatica

et al. 2021

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Culex quinquefasciatus is a cosmopolitan species widely distributed in the tropical and subtropical areas of the world. Due to its long history of close association with humans, the transmission of arboviruses and parasites have an important role in veterinary and public health. Adult females feed mainly on birds although they can also feed on humans and other mammals. On the other hand, larvae are able to feed on a great diversity of microorganisms, including microalgae, present in natural or artificial breeding sites with a high organic load. These two particularities, mentioned above, are some of the reasons why this mosquito is so successful in the environment. In this work, we report the identification of a microalga found during field sampling in artificial breeding sites, in a group of discarded tires with accumulated rainwater. Surprisingly, only one of them had a bright green culture without mosquito larvae while the other surrounding tires contained a large number of mosquito larvae. We isolated and identified this microorganism as Neochloris aquatica, and it was evaluated as a potential biological control agent against Cx. quinquefasciatus. The oviposition site preference in the presence of the alga by gravid females, and the effects on larval development were analyzed. Additionally, microalga effect on Cx. quinquefasciatus wild type, naturally infected with the endosymbiotic bacterium Wolbachia (w+) and Wolbachia free (w−) laboratory lines was explored. According to our results, even though it is chosen by gravid females to lay their eggs, the microalga had a negative effect on the development of larvae from both populations. Additionally, when the larvae were fed with a culture of alga supplemented with balanced fish food used as control diet, they were not able to reverse its effect, and were unable to complete development until adulthood. Here, N. aquatica is described as a biological agent, and as a potential source of bioactive compounds for the control of mosquito populations important in veterinary and human health.

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Section: Discussionmentioning

confidence: 99%

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Culex quinquefasciatus larvae development arrested when fed on Neochloris aquatica

et al. 2021

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“…It is speculated that water hyacinth and water chestnut secrete allelochemicals through the root system, destroying chlorophyll-a in algae cells and inhibiting the activity of superoxide dismutase, thus inhibiting the growth of algae such as Chlorella. At the same time, aquatic plants secrete certain nutrients to promote algae growth, thus reaching a state of dynamic balance (Chaïb et al 2021, Long et al 2021.…”

Section: Plankton Algal Diversity Changesmentioning

confidence: 99%

Kinetics study and bio-phase characteristics of drainage in paddy fields purified by a compound ecological ditch

Zhang

Huang

et al. 2022

Preprint

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Paddy field drainage discharged directly into natural waters without the treatment will aggravate water eutrophication. The removal characteristics of the purified paddy field drainage was explored by establishing an experimental device that simulates a compound ecological ditch (CED), which significantly optimized the absorption capacity of nutrients in rice fields. The results show that the changes of pollutants before and after the experiment indicates that the CED has a significant effect on the removal of pollutants in the drainage of the paddy field. The degradation trend of pollutants in 5 rice growth cycles is in agreement with the first-order kinetic degradation model. Bio-phase microscopy and microbial diversity index reveal that the species of bacteria and plankton algae increase in the continuous operation of the CED, accompanied by the emergence of higher micro-animals. It shows that improved ecosystem water quality is more suitable for the survival and reproduction of various microorganisms. The research results provided a new idea for further improving paddy field drainage treatment efficiency.

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“…The carbon released to the atmosphere from the combustion of biofuels is biogenic, i.e., the carbon fixed by plants/microalgae while growing; hence, it has zero greenhouse gas impact on the atmosphere (Struthers, 2021). Although biomass energy can be obtained from various terrestrial and aquatic plants, microalgae are advantageous in many aspects (Chaïb et al, 2021). Microalgal cells have low land requirements and can store varying proportions of high-valued materials, depending on the ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Microalgae growth and diversity in anaerobic digestate compared to synthetic media

Ermiş

Guven-Gulhan²,

Çakır

et al. 2022

Biofuel Res. J.

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Economizing microalgal cultivation is a considerable milestone targeted by efforts put into microalgal biorefineries. In light of that, the present study was aimed to explore the potential of using anaerobic liquid digestate (ALD) as culture media to grow microalgae and compared it with three different synthetic media (i.e., N8, BBM, and M8) in terms of biomass yield, fatty acid composition, and nutrient utilization/recovery. Moreover, a mixed culture of wild-type microalgae was employed in this study owing to the ability of mixed cultures to survive extreme conditions, eliminating the risk of losing the culture easily, as it mostly happens with pure cultures. The highest nutrient yield coefficients were achieved when the mixed microalgae culture was cultivated in ALD, where the yield coefficient for nitrogen (YN) and yield coefficient for phosphorus (YP) were 10.7 mg biomass mg-1 N and 98 mg biomass mg-1 P, respectively. The highest lipid content (34%) and the highest concentrations of C16:0 (114 mg L-1) and C18:0 (60.9 mg L-1) were also recorded when the mixed microalgae culture was cultivated in ALD. Furthermore, the polyunsaturated fatty acids (PUFA) content also increased significantly in ALD, a beneficial phenomenon as PUFAs in microalgae allow them to adapt more effectively to extreme conditions. Based on the microbial community analysis performed using the multi-marker metabarcoding approach, Diphylleia rotans, Synechocystis PCC-6803, Cyanobium gracile PCC 6307, and Chlorella sorokiniana were identified as the most abundant species in the ALD growth. Overall, based on the findings of the present study, ALD could be used as a promising cultivation medium for microalgae, offering a process integration approach to combine anaerobic digestion and algae cultivation as an effective way to simultaneously treat the high-strength dark-colored ALD and valorize it into profitable byproducts.

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Allelopathy and allelochemicals from microalgae: An innovative source for bio-herbicidal compounds and biocontrol research

Cited by 40 publications

References 174 publications

Culex quinquefasciatus larvae development arrested when fed on Neochloris aquatica

Culex quinquefasciatus larvae development arrested when fed on Neochloris aquatica

Kinetics study and bio-phase characteristics of drainage in paddy fields purified by a compound ecological ditch

Microalgae growth and diversity in anaerobic digestate compared to synthetic media

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