scholarly journals Allelopathic effects of thuja orientalis L. and melia azedarch L. on seed germination of penisitum americanum L

2016 ◽  
Vol 5 (2) ◽  
pp. 140
Author(s):  
Saeeda Bibi ◽  
Rukhsana Jabeen ◽  
Asma Abdul Hayee ◽  
Saima Johar ◽  
Shehnaz Sher Ahmed ◽  
...  
Keyword(s):  
Seed Germination ◽  
Aqueous Extract ◽  
Seedling Growth ◽  
Dry Weight ◽  
Inhibitory Effect ◽  
Water Soluble ◽  
Bark Extract ◽  
Time Period ◽  
Thuja Orientalis ◽  
Different Parts

Aqueous extract of leaves, bark and seeds of Meliaazedarach.L and Thujaorientalis L. were assayed at 1, 5 and 10g/L concentration with different time period to check their effect on seed germination, fresh and dry weight and seedling growth of Pennesitiumamericanum L. Result revealed that aqueous extracts of both plants at all concentration and time period had significantly inhibited seed germination ofP.ammericanum L. when compared with control. The inhibitory effect increases with increasing concentration of extracts and time period. The bark extract of all concentration of T.orientalis in 24hr and 48hrs show stimulation in seedling growth while other parts and extracts of all parts of M.azedarachin all concentration and time period show inhibition in all parameters. The order of inhibition when compared different parts of M.azedarch was seeds >bark > leaves while that of T.orientalis was leaves > bark >seeds. Hence it is concluded that aqueous extract of these plant contain water soluble allelochemicals which inhibit the seed germination and seedling growth of P. americanum L. It is suggested that these chemicals may be used as herbicides.

scholarly journals Effects of exogenous silicon on maize seed germination and seedling growth

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yankun Sun ◽  
Jiaqi Xu ◽  
Xiangyang Miao ◽  
Xuesong Lin ◽  
Wanzhen Liu ◽  
...  
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Crop Yields ◽  
Dry Weight ◽  
Membrane System ◽  
Water Soluble ◽  
Current Status ◽  
Antioxidant Enzyme Activities ◽  
Chlorophyll Contents ◽  
Antioxidant Defence System

AbstractAs the global population continues to increase, global food production needs to double by 2050 to meet the demand. Given the current status of the not expansion of cultivated land area, agronomic seedlings are complete, well-formed and strong, which is the basis of high crop yields. The aim of this experiment was to study the effects of seed germination and seedling growth in response to silicon (from water-soluble Si fertilizer). The effects of Si on the maize germination, seedling growth, chlorophyll contents, osmoprotectant contents, antioxidant enzyme activities, non-enzymatic antioxidant contents and stomatal characteristics were studied by soaking Xianyu 335 in solutions of different concentrations of Si (0, 5, 10, 15, 20, and 25 g·L−1). In this study, Si treatments significantly increased the seed germination and per-plant dry weight of seedlings (P < 0.05), and the optimal concentration was 15 g·L−1. As a result of the Si treatment of the seeds, the chlorophyll content, osmotic material accumulation and antioxidant defence system activity increased, reducing membrane system damage, reactive oxygen species contents, and stomatal aperture. The results suggested that 15 g·L−1 Si significantly stimulated seed germination and promoted the growth of maize seedlings, laying a solid foundation for subsequent maize growth.

INTERFERENCE OF ALLELOCHEMICALS OF THREE WEED SPECIES IN SEED GERMINATION, SEEDLING GROWTH, UPTAKE OF PHOSPHORUS AND ZINC IN THREE VARIETIES OF PADDY

1970 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Chakravarthy ◽  
K. Sharma ◽  
P.B. Rao ◽  
N. Pandey
Keyword(s):  
Seed Germination ◽  
Nutrient Uptake ◽  
Seedling Growth ◽  
Oryza Sativa L ◽  
Chenopodium Album ◽  
Dry Weight ◽  
Water Soluble ◽  
Weed Species ◽  
Polygonum Hydropiper ◽  
Soluble Phenolics

Effect of the extracts of three dominant weed species viz., Phalaris minor Retz., Chenopodium album L. and Polygonum hydropiper L. were examined on the seed germination, seedling growth and nutrient uptake (32p and 65Zn) in Swarna, Jaya and N-359 varieties of paddy (Oryza sativa L.). The maximum reduction in terms of seed germination, radicle and plumule length and total seedling dry weight was caused by P. hydropiper and in terms of radicle and plumule dry weight by C. album. Among the three different varieties irrespective of weed extracts, Swarna was resistant in seed germination, plumule length, radicle, plumule and total seedling dry weight and Jaya was only for radicle length, whereas N-359 was found susceptible in length and total seedling dry weight. The allelochemicals also interfered in gradual decrease in uptake of both 32P and 65Zn with increasing concentration of the chosen three weed extracts, both in root and shoot. Among the three varieties of paddy, Jaya was susceptible for 32P but resistant for 65Zn whereas N-359 was resistant for both the ions. Water soluble phenolics such as gallic, protocatechuic, p-hydroxybenzoic, caffeic and vanillic acids were identified from these extracts. The inhibition may be due to these phenolics and other unidentified secondary metabolites in weed extracts. Key words: Germination, nutrient uptake, paddy, phenolics, seedling growth, weed extracts. Ecoprint Vol.11(1) 2004.

scholarly journals Effect of aqueous extract of Mikania micrantha Kunth on seed germination and seedling growth of Cassia tora L.

2016 ◽  
Vol 6 (1) ◽  
pp. 45-46
Author(s):  
Kishor Kumar Mishra
Keyword(s):  
Seed Germination ◽  
Aqueous Extract ◽  
Seedling Growth ◽  
Leaf Extract ◽  
Dry Weight ◽  
Cassia Tora ◽  
Mikania Micrantha

The order of inhibitory effectiveness of various parts of Mikania micrantha on seed germination and seedling growth of Cassia tora was leaf >stem> inflorescence. The dry weight of C. tora seedlings was lowest under 25% concentration of leaf extract, and highest under treatment with 5% concentration of inflorescence extract of M. micrantha.

scholarly journals ALLELOPATHIC EFFECT OF SIAM WEED DEBRIS ON SEED GERMINATION AND SEEDLING GROWTH OF THREE TEST CROP SPECIES

2020 ◽  
Vol 5 (1) ◽  
pp. 01-04
Author(s):  
Mahfuza Begum ◽  
Md. Abdus Salam ◽  
Farhana Zaman
Keyword(s):  
Seed Germination ◽  
Sustainable Agriculture ◽  
Seedling Growth ◽  
Agricultural Practices ◽  
Dry Weight ◽  
Inhibitory Effect ◽  
Allelopathic Effect ◽  
Inhibitory Effects ◽  
Crop Species ◽  
Agriculture Management

Allelopathy is important for agricultural practices as has gained attention in sustainable agriculture management. Therefore, an experiment was conducted to assess the allelopathic effect of siam weed (Chromolaena odorata L. King and Robinson) debris on the germination and seedling growth of rice, mustard and groundnut at four concentrations of weed debris (e.g., 0, 0.25, 0.5 and 1.0 g dry weight per 100 g soil). The weed debris at different concentrations reduced the seed germination, plant height, leaf numbers, leaf area and seedling dry weight of the test crop species. The inhibitory effects of the test crop were positively related to the concentration of siam weed debris in soil. On the basis of average percent inhibition (API), mustard (24.47%) was mostly affected by the siam weed debris followed by groundnut (20.10%) and rice (17.10%). From the results of the study, it is observed that weed debris of siam weed had inhibitory effect on the seed germination and seedling growth of rice, mustard and groundnut. Therefore, the allelopathic activity of the siam weed may play an important role in the management of sustainable agriculture.

ALLELOPATHIC EFFECTS OF PARTHENIUM HYSTEROPHORUS ON SEED GERMINATION AND SEEDLING GROWTH IN CAJANUS CAJAN

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
G. S. THAKUR
Keyword(s):  
Seed Germination ◽  
Aqueous Extract ◽  
Seedling Growth ◽  
Cajanus Cajan ◽  
Pigeon Pea ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Parthenium Hysterophorus ◽  
Germination Index ◽  
Allelopathic Effects

In this study the allelopathic effects of Parthenium hysterophorus on seed germination and seedling growth in Cajanus cajan (Pigeon pea) was investigated. The dried powdered leaves of Parthenium hysterophorus were soaked in distilled water for 24 hours to obtain aqueous extract of leaves and sterilized seeds were treated with 2%, 4%, 6%,8%, and 10% concentration of extract in triplicate. The germinated seeds were counted every day to observe germination index (G.I.) and mean germination time (MGT). It has been found that germination index (GI) were significantly decreased and MGT were delayed to germinate with increasing concentration. It has been observed that seed germination percentage, root length, shoot length and seedling vigor index were reduced at >2% as compared to control. The 10 % aqueous extract showed completely inhibitory effect on seed germination. The present investigation showed that the leaves aqueous extract of Parthenium hysterophorus had inhibiting effects on seed germination and seedling growth in Cajanus cajan (Pigeon pea).

IMPACT OF FERTILIZERS APPLICATION ON SEED GERMINATION AND SEEDLING GROWTH OF VIGNA RADIATA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
SUPRIYA DIXIT ◽  
R. K. GUPTA
Keyword(s):  
Seed Germination ◽  
Leaf Area ◽  
Seedling Growth ◽  
Vigna Radiata ◽  
Agricultural Research ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Research Field ◽  
Chemical Fertilizer ◽  
Seedling Length

Currently, a real challenge for the workers in the agricultural research field is to stop or reduce the use of expensive agrochemicals/ chemical fertilizers which are hazardous to the environment as well as human health. Present study was aimed to improve the growth and obtain optimum yield of Vigna crop with eco-friendly, non-toxic way and to reduce the use of agrochemical/chemical fertilizer application in agricultural activities. A pot experiment was conducted to study the effect of chemical fertilizer (DAP) and biofertilizer ( Rhizobium strain) separately and in combination on seed germination and seedling growth (at 30 days) based on morphological parameters such as seedling length (cm), fresh weight (g), dry weight (g) and leaf area (cm)2 of Vigna radiata (L.) Wilczek. After one month (30 Days) observations, it was found that seedling length, fresh and dry weights and leaf area were maximum in T4 and minimum in T15, T7 and T8 favored improved seedling length and leaf area whereas T7, T8, and T9 favored improved fresh and dry weights as compared to control.

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.

Assessing allelopathic potential of Sonchus oleraceus L. (milk thistle) on germination and seedling growth of Oryza puncta

2021 ◽  
Vol 27 (1) ◽  
pp. 1-12
Author(s):  
Bilal Ahmad Khan ◽  
Saima Anwar ◽  
Rizwan Maqbool Maqbool ◽  
Muhammad Mohsin Amin ◽  
Muhammad Mansoor Javaid ◽  
...  
Keyword(s):  
Aqueous Extract ◽  
Seedling Growth ◽  
Dry Weight ◽  
Germination Percentage ◽  
Aqueous Extracts ◽  
Emergence Time ◽  
Fresh Weight ◽  
Water Control ◽  
Sonchus Oleraceus ◽  
Oryza Punctata

ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory

Allelopathic potential of Artemisia campestris ssp. caudata on Lake Huron sand dunes

1997 ◽  
Vol 75 (11) ◽  
pp. 1903-1912 ◽  
Author(s):  
Kyeong W. Yun ◽  
M. A. Maun
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Mycorrhizal Fungi ◽  
Sand Dune ◽  
Sand Dunes ◽  
Dry Weight ◽  
Fungal Colonization ◽  
Test Species ◽  
Allelopathic Potential ◽  
Artemisia Campestris

Greenhouse studies were conducted to test allelopathic effects of Artemisia campestris ssp. caudata on seed germination and seedling growth of several sand-dune species and colonization by mycorrhizal fungi. The aqueous extracts of A. campestris showed no inhibitory effect on seed germination, seedling elongation, or dry-weight growth of plants at lower concentrations (10 and 50%), but 100% concentration of the extracts caused varying degrees of inhibition depending on the test species. The mixing of dry leaves of seedlings of A. campestris to the sand showed severe inhibition of Elymus canadensis seedlings. The percent germination of test species in soil from the rhizosphere of A. campestris was significantly lower than that of the control. The leaf area and dry weight were also lower but the differences were not significant. The aqueous extract inhibited mycorrhizal fungal colonization in roots of three sand-dune grasses. Key words: allelopathy, Artemisia campestris ssp. caudata, seed germination, seedling growth, mycorrhizal fungi.

CHEMICAL CONSTITUENTS IN WILD OAT (Avenu fatua) HULLS AND THEIR EFFECTS ON SEED GERMINATION

1982 ◽  
Vol 62 (1) ◽  
pp. 155-161 ◽  
Author(s):  
FRANK S. CHEN ◽  
JOHN M. MacTAGGART ◽  
RICHARD M. ELOFSON
Keyword(s):  
Seed Germination ◽  
Chemical Constituents ◽  
Short Chain Fatty Acids ◽  
Inhibitory Effect ◽  
Water Soluble ◽  
Nonanoic Acid ◽  
Lettuce Seed ◽  
Wild Oat ◽  
Phenolic Inhibitor ◽  
Lettuce Seed Germination

Aqueous extracts of dormant wild oat (Avena fatua L.) hulls had a weak inhibitory effect on lettuce seed germination. Both paper and thin layer chromatographic analyses of the ether-soluble acidic fraction showed the presence of phenolics and short-chain fatty acids. No abscisic acid was detected. Vanillin, protochatechualdehyde, p-coumaric acid, ferulic acid and caffeic acid were isolated from hull extracts. Vanillin was shown to be the main water-soluble phenolic inhibitor of lettuce seed germination. At a concentration higher than 6.6 × 10−3M, vanillin was found to be more inhibitory than nonanoic acid to both lettuce and wild oat germination. The concentration of phenolics in the hulls does not account for suppression of wild oat seed germination.

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