Chemical influences of other plants (allelopathy)

Evenari, M.; Carr, D. J.

doi:10.1007/978-3-662-11209-0_6

Cited by 19 publications

(13 citation statements)

References 470 publications

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“…Several reports have appeared regarding the chemical nature of inhibitors produced by higher plants (Bonner 1950, Bode 1958, B6rner 1960, Evenari 1961, Muller 1964, Rice 1967, Datta & Sinha-Roy 1974. From the present work, it is possible to have some idea about the chemistry of the inhibitory material from C. bonplandianum leaves.…”

Section: Discussionmentioning

confidence: 98%

Phytotoxic effects of Croton bonplandianum Baill. on weedy associates

Datta

Sinharoy

1975

Plant Ecol

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Section: Discussionmentioning

confidence: 98%

Phytotoxic effects of Croton bonplandianum Baill. on weedy associates

Datta

Sinharoy

1975

Plant Ecol

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“…In the absence of further biological information on the species we can only speculate what this may be. It may have a special tolerance of plant exudates (Evenari, 1961) or it may occupy a slightly different niche in space or time from its associates (de Wit, 1960). The latter cause is to some extent indicated in that its performance in monoculture is rather less than expected from its performance in mixtures (i.e.…”

Section: Interactions Between Competing Species 185mentioning

confidence: 99%

Regression analysis of interactions between competing species

Bréese

Hill

1973

Heredity

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SUMMARYThe method of investigating interactions in two-way tables by the regression analysis introduced by has been applied to data from competition diallel experiments with plant species reported by and Norrington-Davies (1968). Arithmetic and logarithmic scales were used in both experiments and the relative advantages of these are briefly discussed.Significantly high proportions of the interactions between species (row) and associates (column) effects were explained as differences between the linear regressions of individual performance on the associate values. Consequently the performance of the species in competition could largely be specified by three parameters. These were the species mean (v), the regression coefficient (b) and the mean effect of associates (a), which respectively measured the general vigour of the species, its sensitivity to competition and its aggressiveness. The parameters were used to derive formulae which provide descriptive and predictive measurements of the competitive advantage of species in particular combinations, and of the mixture performances relative to the performance of other mixtures or monocultures. The types of competition phenomena which could derive from a situation involving only general competitive abilities were shown to vary greatly and depended on the correlations between the three parameters in the experimental material.The possible types of interactions between associated genotypes (competi. tion, co-operation, antagonism, etc.) can be defined in terms of the general competitive ability parameters, or recognised as specific competitive abilities. It is thus suggested that the regression technique forms a useful approach to the discovery and classification of these effects among competing species.The second experiment (Norrington-Davies, 1968) involved competition between grass species under four different treatments. Common regression lines constructed over all treatments indicated that response to competitive stress was to some extent similar to the response to other kinds of environmental stress. This raised the concept that some aspects of general competitive abilities could be determined from general response to limitation in environmental factors. The plant breeding implications of this are briefly discussed, particularly the possibility of predicting performance under competition from performance as spaced plants.

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“…The additive or synergistic effects become significant even at low concentrations of the extracts (Einhelliing, 1995). The concept of allelopathy was further supported and developed by Bonner (1950), Grummer and Beyer (1960), Evenari (1961), Whittaker (1970), Pitman and Duke (1978) and Fischer et al (1978). According to Lavabre (1991), allelopathic effects are controversial and still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Allelopathic effect of medicinal plant Cannabis sativa L. on Lactuca sativa L. seed germination

Mahmoodzadeh

Ghasemi

Zanganeh

2015

AAS

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In order to examine allelopathic effect of Cannabis sativa L. on germination capability and seedling growth of Lactuca sativa L., a study was performed in laboratory conditions. Treatments were set up in randomised block design in four replications for each of four concentration ranges of 25, 50, 75 and 100 % of aqueous extract made of shoot parts and 4 identical extract concentrations made of root of cannabis. Control variant was lettuce seed treated by distilled water. During the studies shoot and seminal root length of lettuce seedlings were measured after treatments with different concentrations of extracts made of root and shoot parts of cannabis, and the obtained values were compared with the control. The obtained results suggest that the extract from the shoot parts of cannabis in high concentrations of 75 and 100% had inhibiting effect to the germination indices while the extract from the root had no statistically significant effect on germination of lettuce seeds. Extract made of root part of cannabis showed also stimulatory effect to shoot and seminal root length of lettuce seedlings in extract concentrations of 50, 75 and 100 %. V laboratorijskih razmerah je bil preučevan alelopatičen učinek navadne konoplje (Cannabis sativa L.) na kalitev semen in rast kalic vrtne solate (Lactuca sativa L.). Obravnavanja so bila izvedena kot naključni bločni poskus v štirih ponovitvah z vsako od štirih koncentracij, 25, 50, 75 in100 %, vodnega izvlečka poganjkov in korenin konoplje. V kontrolnem poskusu so bila semena vrtne solate tretirana na enak način z distilirano vodo. Poleg indeksa kalitve sta bili v poskusi merjeni še dolžina poganjkov in semenskih korenin kaleče solate. Rezultati so pokazali, da je imel izvleček poganjkov konoplje v večjih koncentracijah, 75 in 100 %, inhibitorni učinek na kalitveni indeks, medtemko izvlečki iz korenin niso imeli statistično značilnega vpliva na iste merjene parametre. Izvleček iz korenin konoplje je imel stimulativni učinek na dolžino poganjkov in semenskih korenin vrtne solate pri koncentracijah 50, 75 in 100 %.

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Chemical influences of other plants (allelopathy)

Cited by 19 publications

References 470 publications

Phytotoxic effects of Croton bonplandianum Baill. on weedy associates

Phytotoxic effects of Croton bonplandianum Baill. on weedy associates

Regression analysis of interactions between competing species

Allelopathic effect of medicinal plant Cannabis sativa L. on Lactuca sativa L. seed germination

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