The combined treatments of Canada goldenrod leaf extracts and cadmium pollution confer an inhibitory effect on seed germination and seedling development of lettuce

2018 ◽  
Vol 66 (4) ◽  
pp. 331 ◽  
Author(s):  
Congyan Wang ◽  
Kun Jiang ◽  
Bingde Wu ◽  
Jiawei Zhou
Keyword(s):  
Heavy Metals ◽  
Invasive Species ◽  
Seed Germination ◽  
Native Species ◽  
Inhibitory Effect ◽  
Seedling Development ◽  
Combined Treatments ◽  
High Concentration ◽  
Leaf Extracts ◽  
Allelopathic Effects

Increasing levels of heavy metals are released into ecosystems. The influence of heavy metal pollution on successful invasive species has raised considerable interest, particularly regarding potential allelopathic effects on seed germination and seedling development of native species. Adding heavy metals may alter or even enhance such allelopathic effects of invasive species. The aim of the present study was to address the combined treatments of the invasive species Canada goldenrod (Solidago canadensis L.) leaf extracts and cadmium (Cd) pollution on seed germination and seedling development of the homologous native species lettuce (Lactuca sativa L.). Results showed that the combined treatments of Canada goldenrod leaf extracts and Cd pollution significantly decreased seed germination and seedling development of lettuce compared with the control. In addition, the indices of allelopathic effects for all seed germination and seedling development indices of lettuce were less than zero under the combined treatments of high concentration of Canada goldenrod leaf extracts and Cd pollution (regardless of concentration). Thus, the combined treatments of high concentration of Canada goldenrod leaf extracts and Cd pollution pose an inhibitory effect on seed germination and seedling development of lettuce. Further, the combined treatments of high concentration of Canada goldenrod leaf extracts and Cd pollution (regardless of concentration) cause more toxic effects than the combined treatments of low concentration of Canada goldenrod leaf extracts and Cd pollution (regardless of concentration) on all seed germination and seedling development indices of lettuce. Thus, the inhibitory effects of Canada goldenrod on the seed germination and seedling development of co-occurring native species may be intensified at heavy invasion degrees under increased heavy metal pollution. Subsequently, the competitiveness and fitness of native species may be notably decreased via the reduced seed germination and seedling development and then the notorious invader can establish progressively-growing populations in the colonised ecosystems.

scholarly journals The effect of elevated Zn concentrations on seed germination and young seedling growth of Ailanthus altissima (Mill.) swingle

2014 ◽  
pp. 145-157
Author(s):  
Sladjana Samuilov ◽  
Danijela Djunisijevic-Bojovic ◽  
Matilda Djukic ◽  
Jelena Rakovic
Keyword(s):  
Heavy Metals ◽  
Seed Germination ◽  
Seedling Growth ◽  
Zinc Sulfate ◽  
Heavy Metal Stress ◽  
Inhibitory Effect ◽  
Ailanthus Altissima ◽  
High Concentration ◽  
High Concentrations ◽  
Invasive Tree Species

Some heavy metals such as Zn are essential micronutrients for plants. However, in a high concentration in soils they could cause repression of growth with toxicity symptoms. It is therefore very important to investigate the species that are tolerant to high concentration of zinc which have the ability to survive on soils contaminated with heavy metals. This paper presents an investigation of the effect of elevated Zn concentrations on the germination and seedling growth of the invasive tree species Ailanthus altissima (Swingle) Mill., aimed at a better understanding of its adaptation ability to heavy metal stress and potential use in phytoremediation. Seeds of Ailanthus altissima were treated with Zn concentrations of 25, 100 and 250 ?M in form of zinc sulfate. After germination, the seedlings at the stage of first leaf development were transferred into a growing chamber in the hydroponic system where zinc sulfate was added in the concentrations of 100, 250 and 500 ?M. The results showed that Zn treatments, including the highest concentration, have caused a reduction in seed germination parameters. Considering the hypocotyl and radicle length, there was no significant statistical difference among the treatments, but further growth of young seedlings in hydroponics under high concentrations of Zn, cause an inhibition of the root system growth and repress development of assimilating organs. Seeds and seedlings of A. altissima are tolerant to elevated Zn concentrations at early stages of development. However, later on with leaves development, the inhibitory effect of the strongest concentrations is expressed.

Allelopathic Potency and an Active Substance from Hairy Vetch

2020 ◽  
Author(s):  
Weihong Sun ◽  
Guofeng Yang ◽  
Lili Cong ◽  
Juan Sun ◽  
Lichao Ma
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Root Length ◽  
Leaf Extract ◽  
Growth Inhibitor ◽  
Inhibitory Effect ◽  
Allelopathic Effect ◽  
Coumaric Acid ◽  
Hairy Vetch ◽  
Allelopathic Effects

Background: Plant allelopathy refers to the release of chemicals from plants or microorganisms into the environment, may have direct or indirect, beneficial or harmful effects on other plants or microorganisms. When plants grow in an unfavorable environment,more allelochemicals will be secreted and the expression of allelopathic effects will increase, giving plants a certain competitive advantage. Hairy vetch is one of the most promising allelopathic crops and the aqueous extract of hairy vetch has an inhibitory effect on the root length and seedling height of grass crops. The current study aimed to study the allelopathic effect of hairy vetch on alfalfa, and exploring an ecological method to remove the root system of alfalfa.Methods: In this experiment, the allelopathic effects of the seeds, stems and leaves, roots extracts and root exudates (0, 3, 6, 9 and 12 mg·mL-1) on the seed germination and seedling growth of alfalfa were evaluated. And the main allelopathic substances from the stem and leaf extract were isolated and identified using high performance liquid chromatography- mass spectrometry (HPLC-MS).Result: The results showed that all of the extracts can inhibit alfalfa seed germination and seedling growth and stem and leaf extract had the strongest inhibitory effect, especially for inhibiting the root growth. A main allelochemical substance, o-coumaric acid, was screened out and the root length of alfalfa was completely inhibited at 1.6 mg·mL-1 of o-coumaric acid. The findings of these experiments show hairy vetch has strong allelopathic effect on alfalfa and o-coumaric acid is a chemical growth inhibitor.

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

Botany ◽  
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.

Allelopathy and Preliminary Separation of Allelopathic Substance in the Extracts of Wheat Seed Germination

2012 ◽  
Vol 468-471 ◽  
pp. 565-568 ◽  
Author(s):  
Jing Wen Bai ◽  
Jing Wang ◽  
Bo Tao ◽  
Chun Hong Teng
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Petri Dish ◽  
Inhibitory Effect ◽  
Chloroform Extract ◽  
Wheat Seed ◽  
Cucumis Sativus L ◽  
Chloroform Phase ◽  
Allelopathic Effects ◽  
Allelopathic Substance

One variety of durum wheat (Triticum durum L.), ‘Longfu 30’, was choosen to study the allelopathic effects of seed germination extracts on other plants. The allelopathic effects of different polarity extracts were measured in terms of germination rate and germination speed on a test cucumber variety ‘Jinyou No.2’ (Cucumis sativus L.), and the allelopathic substance in chloroform extract was preliminarily separated with HSCCC and determined by GC-MS. The results showed that the allelopathy of wheat seed germination extracts varied with the polarity of solvent, and the substance in chloroform phase was the most active and showed a significantly inhibitory effect on seed germination of cucumber by 80.7% under Petri dish culture. The major allelopathic substance in wheat seed germination extracts were phenol, amine, piperazine, alcohols, esters and ketones.

Effect of Aqueous Leaf Extract of Parthenium hysterophorus L. on the Germination and Shoot Growth of Two Native Species

2013 ◽  
Vol 726-731 ◽  
pp. 4348-4351 ◽  
Author(s):  
Gang Hu ◽  
Zhong Hua Zhang ◽  
Bao Qing Hu
Keyword(s):  
Seed Germination ◽  
Native Species ◽  
Shoot Growth ◽  
Southern China ◽  
Parthenium Hysterophorus ◽  
Native Plant ◽  
Leaf Extracts ◽  
Allelopathic Potential ◽  
Plantago Asiatica ◽  
The Impact

In order to evaluate the allelopathic potential of an exotic invasive weed,Parthenium hysterophorusL., the effect of different concentrations of aqueous extracts (5%, 25%, 50%, 75% and 100%) prepared from leaves ofP. hysterophoruswere studied on the seed germination and seedling shoot growth of two common native herbs,Plantago asiaticaL. andYoungia japonica(L.) DC., through laboratory bioassays. The aqueous leaf extracts at the concentrations of 25%, 75% and 100% significantly inhibited the seed germination and seedling shoot growth of two target species. There was complete failure of seed germination ofY. japonicain 75% and 100% aqueous leaf extracts. The inhibitory effect increased with increasing extract concentration. These results suggested that allelopathy may play a role in the impact ofP. hysterophorusinvasion on native plant recruitment of invaded communities in southern China.

scholarly journals Phytotoxicity of exotic plants on the physiological potential of seeds of native species of caatinga

2018 ◽  
Vol 12 (2) ◽  
pp. 134 ◽  
Author(s):  
Silvana Fraga Silva ◽  
Halina Stéffany Lopes Costa ◽  
Jesimiel Silva Viana ◽  
Ana Maria Oliveira Ferreira ◽  
Diego Sousa Pereira ◽  
...  
Keyword(s):  
Seed Germination ◽  
Native Species ◽  
Biodiversity Loss ◽  
Exotic Plants ◽  
Inhibitory Effect ◽  
Allelopathic Effect ◽  
Native Forest ◽  
Aqueous Extracts ◽  
Physiological Quality ◽  
Invasive Exotic

The introduction of species is one of the major causes of biodiversity loss. Invasive exotic plants adapt, propagate and dominate, damaging both natural processes and native species. Thus, the objective was to evaluate the allelopathic effect of three exotic species in the caatinga, on the physiological quality of native forest seeds. Aqueous extracts of leaves of Azadirachta indica, Prosopis juliflora and Cryptostegia madagascariensis were tested to evaluate their effect on the seed germination and seedling vigor of Piptadenia moniliformis, Mimosa tenuiflora and Mimosa caesalpiniaefolia. Seed germination of M. tenuiflora was inhibited by the aqueous extracts of P. juliflora and A. indica in 100% and 42%, respectively, with a reduced GVI with the extracts of P. juliflora and C. madagascariensis. Regarding AEI, P. juliflora extract had positive effect on P. moniliformis seeds and negative on M. tenuiflora seeds, close to -1. A reduction in height of P. moniliformis was observed when the seedlings were in contact with the extracts of the invasive plants studied. For M. tenuiflora, the extract of P. juliflora prevented the formation of seedlings, and M. caesalpiniaefolia presented higher inhibitory effect with extracts of P. juliflora and A. indica. Therefore, M. tenuiflora showed to be sensitive to P. juliflora phytotoxicity.

scholarly journals Allelopathic and Competitive Interactions Between Native and Alien Plants

2021 ◽  
Author(s):  
Ling Yuan ◽  
Junmin Li ◽  
Feihai Yu ◽  
Ayub Oduor ◽  
Mark van Kleunen
Keyword(s):  
Seed Germination ◽  
Homeland Security ◽  
Native Species ◽  
Alien Plants ◽  
Competition Experiment ◽  
Aqueous Extracts ◽  
Negative Effects ◽  
Competitive Effects ◽  
Allelopathic Effects ◽  
Allelopathic Interactions

Abstract The novel-weapons and homeland-security hypotheses are based on the idea that aliens and natives are not adapted to each other’s allelochemicals as they did not co-evolve. However, as only a few studies have tested this, it remains unclear how important co-evolutionary history is in determining the strength of allelopathic interactions between aliens and natives. Here, we tested for potential pairwise allelopathic effects on each other of five alien and five native herbaceous species in China. We did a germination and a competition experiment. In the germination experiment, we tested whether aqueous extracts of the ten study species had allelopathic effects on each other’s seed germination. In the competition experiment, we tested whether the alien and native species differed in their competitive effects and responses, and whether these were changed by the presence of activated carbon –a presumed allelopathy neutralizer– in the soil. Plant extracts had negative allelopathic effects on seed germination. This was particularly the case for extracts from the native species. Moreover, aqueous extracts had slightly stronger negative effects on germination of the aliens than on germination of the natives. In the competition experiment, on the other hand, the natives suffered more from competition than the alien species did, but we could not relate this to allelopathy. Alien plants had negative competitive and allelopatic effects on native plants, and the reverse was also true. These alien-native interactions, however, were not consistently stronger or weaker than native-native interactions or alien-alien interactions.

scholarly journals Studies on Allelopathic Effect of Aqueous Leaf Extract of Putranjiva Roxburghii Wall. on Seed Germination and Early Growth of Chickpea (Cicer Arietinum L.)

2019 ◽  
Author(s):  
Satyajit Oraon ◽  
Subrata Mondal
Keyword(s):  
Seed Germination ◽  
Leaf Extract ◽  
Inhibitory Effect ◽  
Early Growth ◽  
Growth Stages ◽  
Allelopathic Effect ◽  
Leaf Extracts ◽  
Cicer Arietinum L ◽  
Aqueous Leaf Extract ◽  
Putranjiva Roxburghii

The present study reveals the allelopathic effect of aqueous leaf extracts of Putranjiva roxburghii Wall. on seed germination and early growth stages of an economically important plant chickpea (Cicer arietinum L.). Aqueous leaf extracts at 0, 5, 10, 15, 25, 35, 50, 75 and 100% concentrations were applied to determine their effect on seed germination and early growth stages under laboratory conditions. Laboratory-based experiments with three replicates were used to arrange treatments accordingly. After 5 days of incubation the rate of seed germination, radicle length and hypocotyls length etc. of chickpea seeds were observed after treatment with aqueous leaf extracts. Highest inhibitory effect was noticed in 100% of aqueous leaf extract. Results indicated that the inhibitory effect was proportional to the concentration of the extracts. The water soluble leaf extracts contain allelochemicals, which inhibit the seed germination and reduced the early growth of chickpea.

scholarly journals Effects of Exogenous Calcium on Datura Seed Germination under Drought Stress

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Yongji Wang
Keyword(s):  
Drought Stress ◽  
Seed Germination ◽  
Germination Rate ◽  
Inhibitory Effect ◽  
Control Group ◽  
High Concentration ◽  
Moisture Condition ◽  
Moderate Drought ◽  
Exogenous Calcium ◽  
Effects Of Drought

With polyethylene glycol (PEG-6000), of 0% (CK), 5%, 10%, 15%, 25% used to simulate drought stress, and CaCl2 concentration 0 (CK), of 15, 20, 25 and 30mmol/L as ion gradient of exogenous calcium, the effects of drought, exogenous calcium and the interaction between the two on the Datura seed germination, so as to explore the optimal application amount of exogenous calcium to ease the suppression of drought stress on Datura seed germination. The results showed that the germination rate, germination potential and germination index of the Datura seeds were significantly lower than those of the control group. Under the normal moisture condition, exogenous calcium of moderate and low concentration had no significant effect on the Datura seed germination, while that of high concentration showed an inhibitory effect on the seed germination. Under drought stress, with the increasing concentration of exogenous calcium, the three indicators of Datura seeds showed a trend of increasing first and then decreasing. When the exogenous calcium had the concentration of 20 mmol/L, all the indicators of seed germination reached the maximum value, while showed a downward trend when exogenous calcium concentration was 25-30 mmol/L, and even increasingly sharp with drought intensifying. Therefore, in the production and utilization of Datura, 20 mmol/L of exogenous calcium can be used to soak seeds before sowing to improve the emergence rate under low and moderate drought conditions.

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