A chemical basis for differential allelopathic potential of sorghum hybrids on wheat

Ben-Hammouda, Moncef; Kremer, Robert J.; Minor, Harry C.; Sarwar, Muhammad Tariq

doi:10.1007/bf02033460

Cited by 100 publications

(58 citation statements)

References 19 publications

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“…Resíduos de sorgo em decomposição liberam quantidades expressivas de substâncias hidrofílicas, em sua maioria ácidos fenólicos, como ferúlico, vaní-lico, p-hidroxibenzóico, p-cumárico e siríngico (Guenzi & McCalla, 1966;Nicollier et al, 1983;Weston et al, 1999). As concentrações totais de substâncias fenólicas em plantas de sorgo variam entre genótipos, com a parte da planta e com a estação de crescimento (Ben-Hammouda et al, 1995).…”

Section: Resultsunclassified

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Potencial de utilização de cobertura vegetal de sorgo e milheto na supressão de plantas daninhas em condição de campo: II - Efeitos da cobertura morta

Trezzi¹,

Vidal

2004

Planta daninha

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RESUMO -A capacidade de supressão de plantas daninhas por culturas de cobertura é bastante conhecida e explorada, embora seja pouco pesquisada a importância relativa dos efeitos físicos e alelopáticos sobre esse fenômeno. Dois experimentos foram realizados a campo, em 1999/2000 e 2000/2001, na área experimental da Faculdade de Agronomia da UFRGS, no delineamento experimental em blocos ao acaso, com quatro repetições, objetivando determinar os efeitos da cobertura morta de plantas de sorgo e de milheto sobre a supressão de plantas daninhas. Nos dois anos de condução dos experimentos, os tratamentos resultaram de um fatorial, em que o fator A foi constituído pelos genótipos de sorgo RS 11, BR 601 e BR 304, representantes de três classes de produção de extratos radiculares hidrofóbicos em laboratório, pelo genótipo de milheto Comum RS e por uma testemunha sem culturas; e o fator B, constituído por níveis de palha de cada genótipo sobre o solo. Em 1999/2000, níveis de palha de sorgo de 1,3 t ha -1 foram suficientes para reduzir 50% das infestações de Brachiaria plantaginea (BRAPL) e Sida rhombifolia (SIDRH). Em 2000/2001, 4 t ha -1 de palha de sorgo ou milheto foram suficientes para reduzir 91, 96 e 59% da população total de SIDRH, BRAPL e Bidens pilosa, respectivamente. A presença de resíduos da parte aérea de sorgo é mais importante na supressão de plantas daninhas do que a presença de resíduos das raízes dessa cultura.Palavras-chave : Sorghum spp., Pennisetum americanum, níveis de palha, alelopatia, fatores físicos. , in 1999/2000 and 2000/ 2001, at ABSTRACT -The weed supression capacity of cover crops is well known and explored, although only a few works have been conducted on the relative importance of the physical and allelopathic effects on this phenomenon. Two trials were carried out in the field

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Section: Resultsunclassified

“…Variações consideráveis desses compostos foram encontradas em tecidos vegetais e no solo quando foram comparados três genótipos de sorgo (Ben-Hammouda et al, 1995).…”

Section: Introductionunclassified

Potencial de utilização de cobertura vegetal de sorgo e milheto na supressão de plantas daninhas em condição de campo: II - Efeitos da cobertura morta

Trezzi¹,

Vidal

2004

Planta daninha

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“…This variability is proposed to be related to variations in the profiles and quantities of secondary metabolites (Ben-Hammouda et al 1995). Untill now only 44 compounds belonging to different chemical classes (phenolics, alkaloids, cyanoglucosides, polyamines etc.)…”

Section: Introductionmentioning

confidence: 99%

Allelopathic and autotoxicity effects of barley (Hordeum vulgare L. ssp. vulgare) root exudates

et al. 2014

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The allelopathic activity of barley (Hordeum vulgare L. ssp. vulgare) root exudates was studied by comparing their effects on seedling establishment in barley itself and in two weed species, Bromus diandrus Roth, and Lolium rigidum Gaudin, using an original laboratory protocol, named 'seed-after-seed'. In this protocol, the donor and the receiver species of water-soluble allelochemicals are grown one after the other in the same dishes, in conditions reducing resource competition between both species. Growth of all receptive species (weeds and barley) was inhibited in a dose-dependent manner, when using increasing barley seed densities (0, 8, 19 and 25 seeds per Petri dish). In our conditions, the barley varieties and landraces exhibited different allelopathic activities against weeds or barley. The allelopathic potential of the barley root exudates was also dependent on the receiver species. Indeed, the released allelochemicals proved to be more toxic against the weed plants than on barley itself. Furthermore, the toxicity of the allelochemicals increased after their release by roots, between day 0 and day 6. These allelochemicals might contribute to the plant community dynamics and their usefulness as bio-herbicides deserves further consideration.

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“…Phenolic compounds of fenugreek seeds were extracted according to the method outlined by Ben-Hammouda et al (1995). A known dry weight of fine powdered seeds was used to prepare the extract using diethyl ether.…”

Section: Hplc Analysismentioning

confidence: 99%

Fenugreek Seed Extract Enhanced the Growth of Vicia faba and Zea mays Seedlings

Madany

Khalil

2017

Egypt. J. Bot.

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H IGHER plants produce many phytochemical constituents that not only play a pivotal role in plants producing them, but also affect their neighboring plant communities. This study was conducted to evaluate the effect of fenugreek seed extract on the growth of faba bean (Vicia faba) and maize (Zea mays) seedlings. The allelochemical components of fenugreek seed extract were analysed and confirmed the abundance of vanillic, syringic, 4-hydroxycinnamic, sinapic, caffeic, salicylic and p-hydroxybenzoic, ferulic acids as well as coumarin. Fenugreek seed extract up to 1.0 % (w/v) efficiently enhanced the growth as well as the chlorophyll content of faba bean and maize seedlings. Furthermore, elevated levels of the amylolytic and proteolytic activities under these concentrations of fenugreek treatments were associated with a marked accumulation of soluble sugars and proteins. Moreover, the potentiality of fenugreek treatments to accumulate phenolic and flavonoid was associated with stimulation in the activities of phenylalanine ammonia lyase, peroxidase and polyphenol oxidase as well as a marked enhancement in total antioxidant capacity which would improve the plant antioxidant status. Concerning the membrane integrity, fenugreek treatments caused a pronounced retardation in both MDA and H 2 O 2 content. Our results elucidated the effect of fenugreek seed extract on the growth and some physiological behaviors of both faba bean and maize seedlings.

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A chemical basis for differential allelopathic potential of sorghum hybrids on wheat

Cited by 100 publications

References 19 publications

Potencial de utilização de cobertura vegetal de sorgo e milheto na supressão de plantas daninhas em condição de campo: II - Efeitos da cobertura morta

Potencial de utilização de cobertura vegetal de sorgo e milheto na supressão de plantas daninhas em condição de campo: II - Efeitos da cobertura morta

Allelopathic and autotoxicity effects of barley (Hordeum vulgare L. ssp. vulgare) root exudates

Fenugreek Seed Extract Enhanced the Growth of Vicia faba and Zea mays Seedlings

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