The allelopathic effects of aqueous extracts from Spartina alterniflora on controlling the Microcystis aeruginosa blooms

Several cover crops (CCs) exert allelopathic effects that suppress weed growth. The aim of the present study was to evaluate the effects of aqueous extracts containing different concentrations [0, 0.5, 1, 2.5, 5, 7.5 and 10% (w/v)] of Brassicaceae CCs (Sinapis alba, Raphanus sativus, Camellina sativa) and of the CCs Fagopyrum esculentum and Guizotia abyssinica on germination and early growth of Ambrosia artemisiifolia L. The allelopathic effects were species and concentration-dependent. C. sativa, for example, caused the greatest potential to inhibit germination, shoot, radicle length and fresh seedling weight, whereas S. alba and R. sativus inhibited germination and early growth of A. artemisiifolia only at concentrations ≥7.5%. In contrast, no inhibition was observed when aqueous extracts of F. escultneum and G. abyssinica were added at any of tested concentration. Liquid chromatography-tandem mass spectrometry detected 15 phenolic compounds in Brassicaceae CCs with the highest content (µg/g) of vanillin (48.8), chlorogenic acid (1057), vanilic acid (79), caffeic acid (102.5) and syringic acid (27.3) in C. sativa. Our results suggest that C. sativa is the most allelopathic CCs and that the fruits of C. sativa are the plant organs richest in allelochemicals.

Download Full-text

Application of Box-Behnken design in optimization of allelopathic effects of Potamogeton pectinatus against Microcystis aeruginosa

Transactions of Tianjin University ◽

10.1007/s12209-014-2205-y ◽

2014 ◽

Vol 20 (5) ◽

pp. 344-349 ◽

Cited By ~ 1

Author(s):

Nan Zhang ◽

Min Ji ◽

Tao Pan ◽

Changhong Sun

Keyword(s):

Microcystis Aeruginosa ◽

Potamogeton Pectinatus ◽

Box Behnken Design ◽

Allelopathic Effects

Download Full-text

Allelopathic effects of weed spp on the root border cells of Fagopyrum tataricum (L.) Gaertn

Allelopathy Journal ◽

10.26651/allelo.j/2021-52-1-1309 ◽

2021 ◽

Vol 52 (1) ◽

pp. 85-102

Author(s):

Y.Y. Xie ◽

L.X. Yao ◽

S. Wei ◽

S.H. He ◽

L. Chen ◽

...

Keyword(s):

Nitric Oxide ◽

Reactive Oxygen Species ◽

Mitochondrial Membrane ◽

Reactive Oxygen ◽

Aqueous Extracts ◽

Oxygen Species ◽

Weed Species ◽

Fagopyrum Tataricum ◽

Bidens Pilosa ◽

Allelopathic Effects

We studied the allelopathic effects of aqueous extracts of Galinsoga parviflora Cav., Chenopodium ambrosioides L., and Bidens pilosa L. weed species on the developmental characteristics of Tartary buckwheat RBCs. The increase in the concentration of aqueous extracts, there was increase in apoptosis rate and mucigel thickness of the RBCs, level of intracellular reactive oxygen species and nitric oxide, but decreased the mitochondrial membrane potential (P <0.05). The allelopathic effects of aqueous extracts of donor weed species on RBCs followed the order: C. ambrosioides > B. pilosa > G. parviflora. The increased levels of reactive oxygen species, nitric oxide and the reduced potential of mitochondrial membrane, further disrupted the homeostasis and normal metabolism of cells, thereby inducing the cell death. Among the three weed species, C. ambrosioides had the most significant impact

Download Full-text

Identification of aqueous extracts from Artemisia ordosica and their allelopathic effects on desert soil algae

Chemoecology ◽

10.1007/s00049-018-00276-8 ◽

2019 ◽

Vol 29 (2) ◽

pp. 61-71 ◽

Cited By ~ 1

Author(s):

Xiangjun Zhou ◽

Yurui Zhang ◽

Xiaoliang An ◽

Roberto De Philippis ◽

Xinyue Ma ◽

...

Keyword(s):

Desert Soil ◽

Aqueous Extracts ◽

Soil Algae ◽

Artemisia Ordosica ◽

Allelopathic Effects

Download Full-text

Selective Inhibition on Growth and Photosynthesis of Harmful Cyanobacteria (Microcystis aeruginosa) by Water Soluble Substances of Dendranthema indicum Flowers

Water ◽

10.3390/w12072014 ◽

2020 ◽

Vol 12 (7) ◽

pp. 2014

Author(s):

Yunni Gao ◽

Fang Zhang ◽

Jing Wu ◽

Hui Yang ◽

Jing Dong ◽

...

Keyword(s):

Microcystis Aeruginosa ◽

Green Algae ◽

Solid Phase ◽

Haematococcus Pluvialis ◽

Growth Promotion ◽

Selective Inhibition ◽

Water Soluble ◽

Cyanobacterial Blooms ◽

Aqueous Extracts ◽

Active Substances

Harmful cyanobacterial blooms become serious environmental issues in various waterbodies, including aquaculture ponds, which inherently need a high biomass and healthy composition of phytoplankton to sustain their high productivity. Indoor bioassays were conducted to investigate the effects of an aqueous extract of Dendranthema indicum flowers on cyanobacteria and green algae species. The thermal stability and polarity of the water-soluble active substances of D. indicum flowers were also assessed based on the growth and photosynthesis responses of Microcystis aeruginosa. There was obvious growth promotion of green algae, including Chlorella vulgaris, Kirchneriella sp. and Haematococcus pluvialis and strong growth inhibition of toxigenic and non-toxigenic M. aeruginosa by aqueous extracts of D. indicum flowers at concentrations ranging from 0.5 to 2.0 g·DW·L−1. The cell concentrations of M. aeruginosa and C. vulgaris were 46.5% and 242.2% of those in the corresponding controls after a 10-day exposure to aqueous extracts of D. indicum flowers at 1.0 g·DW·L−1. There must be some water-soluble active allelochemicals released from D. indicum flowers that are responsible for the selective inhibition of M. aeruginosa rather than green algae. The inhibition ratio of the growth and photosynthesis of M. aeruginosa by aqueous extracts of D. indicum flowers at 2.0 g·DW·L−1 prepared with water at 25 °C and 100 °C were above 90% and 80% compared to the cell density and performance index on absorption basis (PIABS) value of M. aeruginosa in the control on day 6, without significant differences. It indicates that the active substances of D. indicum flowers were thermally stable. The methanol fraction eluted from solid phase extraction (SPE)-enriched aqueous extracts of D. indicum flowers showed the strongest inhibition of the growth and photosynthesis of M. aeruginosa compared to the other four fractions. It indicates that the most polar substances of D. indicum flowers were responsible for the selective inhibition of M. aeruginosa. More experiments are required to identify the responsible active substances and reveal the underlying mechanisms of aqueous extracts of D. indicum flowers that selectively inhibit cyanobacteria and regulate the phytoplankton community structure.

Download Full-text

Inhibitory effect of aqueous extracts of Centaurea solstitialis subsp. schouwii on seed germination and growth of Sulla coronaria

Botany ◽

10.1139/cjb-2019-0108 ◽

2020 ◽

Vol 98 (5) ◽

pp. 273-281

Author(s):

Chadlia Hachani ◽

Mohammed S. Lamhamedi ◽

Mejda Abassi ◽

Zoubeir Béjaoui

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Inhibitory Effect ◽

Centaurea Solstitialis ◽

Aqueous Extracts ◽

Linear Relationships ◽

Allelopathic Effects ◽

Anthropogenic Threats ◽

Sulla Coronaria

Biodiversity has been confronted with anthropogenic threats and several natural threats such as biological invasions. The success of these invasions involves phytotoxic products released by invasive plants that can exhibit allelopathic effects on target species. Thus, aqueous extracts from different parts of the Mediterranean yellow star-thistle [Centaurea solstitialis subsp. schouwii (DC.) Gugler], were tested for their allelopathic effects on seed germination and seedling growth of Sulla coronaria (L.). Bioassays were conducted in vitro to test the effects of the aqueous extracts of shoot, basal and root parts of C. solstitialis subsp. schouwii at two different concentrations (50 g·L−1 and 10 g·L−1). The concentrations of total polyphenols, flavonoids, and tannins of the extracts were also evaluated. Our results showed inhibitory effects on the germination and seedling growth of S. coronaria seedlings, particularly with the extract form the basal part, reaching 84%. This study confirms the linear relationships between the allelopathic effects of C. solstitialis subsp. schouwii and the polyphenol and flavonoid contents. However, further experiments are needed under field conditions to confirm the results obtained under laboratory conditions.

Download Full-text