Wyniki wyszukiwania

1

Allelopathic activity of pea and common vetch

100%

Ciarka D., Gawronska H., Okruszko B., Gawronski S. W.

Acta Physiologiae Plantarum

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2007

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tom 29

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nr 1 Suppl.

2

Physiological effects of allelopathic activity of Citrullus colocynthis on Vicia faba and Hordeum vulgare

84%

Salama H. M. H., Al Rabiah H. K. A.

European Journal of Biological Research

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2015

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tom 05

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nr 2

3

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Allelopathic activity of dehulled rice and its allelochemicals on weed germination

84%

Khang D. T., Anh L. H., Thu Ha P. T., Tuyen P. T., Quan N. V., Minh L. T., Quan N. T., Minh T. N., Xuan T. D., Khanh T. D., Trung K. H.

International Letters of Natural Sciences

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2016

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tom 58

In this study, the allelopathic potential of dehulled rice, rice, and hulls of rice on germination of weeds was evaluated in laboratory. Phenolic acids in growth media of these plants were also identified and quantified using HPLC. Identified allelochemicals were reversely tested for phytotoxic effects on germination and seedling growth of barnyardgrass, lettuce, radish and rice. The results showed that the inhibitory effects of dehulled rice were stronger than those of hulls and rice. Dehulled rice caused 66.7% and 50.6% reduction in radish root length and lettuce shoot height, respectively. Dehulled rice showed strong inhibitory effects on root length of lettuce and shoot height of radish while hulls and rice exhibited stimulation. Regarding phenolic identification, vanillin and vanillic acid were detected as allelochemicals in root exudates of rice and tested plants. The results revealed that most of the vanillin and vanillic acid treatments showed high inhibitory effects on germination rates and seedling growth of lettuce and radish, high stimulatory activity on root elongation of rice. Vanillic acid (100 ppm and 200 ppm), vanillin (100 ppm) and their mixture (200 ppm) completely inhibited survival of lettuce. The findings indicate the allelopathic potential of dehulled rice which can be used for identification of more phytotoxins to produce bioherbicides in agricultural practices.

4

Chemical composition in aqueous extracts of Potamogeton malaianus and Potamogeton maackianus and their allelopathic effects on Microcystis aeruginosa

67%

Wang H. Q., Cheng S.-P., Zhang S.-H., He F., Liang W., Zhang L.-P., Hu C.-Y., Ge F.-J., Wu Z.-B.

Polish Journal of Environmental Studies

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2010

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tom 19

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nr 1

213-218

The ethyl acetate fractions of aqueous extracts from two submerged macrophytes Potamogeton malaianus and Potamogeton maackianus were analyzed by gas chromatograph-mass spectrometry (GC-MS). The allelopathic activities and joint effects of the main components in ethyl acetate fractions on Microcystis aeruginosa were also determined. The results indicated that primary compositions in the ethyl acetate fractions were fatty acids, phenolic acids and hydroxy fatty acids that possessed antialgal activities. The joint effect assay for palmitic acid, benzoic acid and lactic acid showed that the additional effects were observed in the mixed organic acid, namely, the inhibitory effects of mixture groups were stronger than that of each compound alone on the growth of M. aeruginosa.

5

Distribution of triterpene acids and their derivatives in organs of cow-berry [Vaccinium vitis-idaea L.] plant

67%

Szakiel A., Mroczek A.

Acta Biochimica Polonica

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2007

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tom 54

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nr 4

733-740

Wild berries of the genus Vaccinium have become increasingly popular in human health promotion due to their nutritional and medicinal properties. Some striking divergence of opinion about the content of triterpenoids in these plants still exists, meanwhile, this very large class of natural isoprenoids exhibits a wide range of biological activities and hence is of growing research interest. An investigation of triterpenoidal constituents from the cowberry (Vaccinium vitis-idaeaL.) plant led to the isolation of two isomeric acids:oleanolic and ursolic and the occurrence of their derivatives in this plant was demonstrated for the first time. Free triterpene acids as well as small amounts of their bound forms (presumable glycosides and glycoside esters) occur in fruits and the vegetative part of the plant, however, in various amounts and different ratios. The total content of both acids was the highest in organs regarded as traditional herbal resources, namely fruits and leaves (1 and 0.6% of dry mass, respectively), whereas it was markedly lower in stems and rhizomes. However, the rhizomes were in turn the plant organ containing relatively the highest amount of the bound forms of both acids (0.01% of dry mass). Ursolic acid was dominant in the whole plant, but the ratio of oleanolic to ursolic acid was significantly different in individual organs, decreasing from the upper (fruits 1:2.4, leaves 1:2) to the lower (stems 1:3.5, rhizomes 1:5.2) parts of the plant. This pattern of distribution of triterpenoids in the plant may have an important physiological and ecological meaning.

6

Autoallelopathic and allelopathic influence of aqueous winter-cereal extracts

51%

Carvalho de M., Halecki W., Mozdzen K., Synowiec A.

Acta Agrobotanica

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2022

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tom 75

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