1992
DOI: 10.1007/bf00010609
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Comparison of osmotic and allelopathic effects of grass leaf extracts on grass seed germination and radicle elongation

Abstract: The influence of osmotic effects of aqueous plant extracts on the results of ailelopathy bioassays was investigated for four pasture grass species. It was found that allelopathic effects were substantially overestimated when osmotic effects were not taken into account. It is concluded that bioassays using aqueous plant extracts are more realistic when osmotically adjusted control values (with the same osmotic potential as the plant extract being tested) are used.

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Cited by 80 publications
(39 citation statements)
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“…The germination, growth, and physiological activity were not depressed significantly at lower concentrations of mannitol solution, but the significant inhibition occurred as the concentrations increased. The inhibition by extracts with high OPs is substantially overestimated regardless of the osmotic effects as is shown clearly in our study and the findings of Wardle et al (1992). According to Anderson and Loucks (1966), the effects by the extracts with OP no greater than ( 0.506 bar might be considered as a phytotoxic effect due to presence of toxic compounds in extracts and our results go beyond other findings in the literature indicating a significant effects on physiological activity of the tested species.…”
Section: Discussionsupporting
confidence: 76%
See 1 more Smart Citation
“…The germination, growth, and physiological activity were not depressed significantly at lower concentrations of mannitol solution, but the significant inhibition occurred as the concentrations increased. The inhibition by extracts with high OPs is substantially overestimated regardless of the osmotic effects as is shown clearly in our study and the findings of Wardle et al (1992). According to Anderson and Loucks (1966), the effects by the extracts with OP no greater than ( 0.506 bar might be considered as a phytotoxic effect due to presence of toxic compounds in extracts and our results go beyond other findings in the literature indicating a significant effects on physiological activity of the tested species.…”
Section: Discussionsupporting
confidence: 76%
“…Mannitol was used due to its inert OP (Wardle et al 1992). Each solution (5 mL) was added to the Petri dishes and followed the same procedures for germination study as well as measurement of biometric and physiological parameters as mentioned previously.…”
Section: Laboratory Experimentsmentioning
confidence: 99%
“…The decay of litter affects the chemical properties of the soil through release of phytotoxic substances which can inhibit root growth and subsequent seedling development or can increase the availability of nutrients in the soil, influencing seed germination and early growth of seedlings (Wardle et al 1992). Seedling recruitment is the emergence of new seedlings in a particular site.…”
Section: Introductionmentioning
confidence: 99%
“…Vários estudos na literatura mostraram que extratos de plantas podem inibir a germinação de sementes não necessariamente devido aos seus constituintes químicos, mas sim em função do potencial osmótico do extrato (Wardle et al 1992, Haugland & Brandsaeter 1996. No presente estudo, apesar do experimento com PEG-6000 ter mostrado atraso na germinação das sementes no primeiro dia, todas apresentaram alta taxa de germinação nos dias seguintes, diferentemente do observado com extratos de eugenol ou mesmo com eugenol puro.…”
Section: Discussionunclassified