Seed germination of common weed species as affected by oxygen concentration, light, and osmotic potential

Boyd, Nathan S.; Acker, Rene Van

doi:10.1614/ws-03-15r2

Cited by 55 publications

(43 citation statements)

References 36 publications

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“…Sementes de muitas espécies de plantas daninhas podem germinar apenas na presença de luz, enquanto outras germinam igualmente em condições de presença e ausência de luz (Opeña et al, 2014). Alguns estudos já constataram comportamento similar com espécies de Echinochloa colona, E. crusgalli e E. glabrescens, o que corrobora os resultados encontrados no presente estudo (Boyd & Acker, 2004;Chauhan & Johnson, 2011;Opeña et al, 2014).…”

Section: Resultsunclassified

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Germinação De Sementes De Capim-Arroz Submetidas a Condições De Luz E Temperatura

et al. 2015

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Section: Resultsunclassified

“…Para sementes de capimarroz em regimes de luz/escuro, ocorreu germinação em torno de 69%; em contrapartida, na ausência da luz os valores não excederam 24% (Boyd & Acker, 2004).…”

Section: Introductionunclassified

Germinação De Sementes De Capim-Arroz Submetidas a Condições De Luz E Temperatura

et al. 2015

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“…Na presença de luz, a germinação foi de 91% a 97% entre os biótipos avaliados, com exceção de um que apresentou 27%. Segundo Boyd & Acker (2004), a luz proporcionou 69% de germinação em sementes de Echinochloa crusgalli, comparado a 24% de germinação no escuro.…”

Section: Resultsunclassified

Luz e KNO3 na germinação de sementes de Ageratum conyzoides L. sob temperaturas constantes e alternadas

Ikeda

Carmona

Mitja

et al. 2008

Rev. bras. sementes

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RESUMO -Ageratum conyzoides é uma planta daninha de origem tropical que apresenta presença expressiva nos bancos de sementes em que ocorre. Considerando-se a importância de conhecer os fatores que afetam a germinação de sementes no manejo das espécies de plantas daninhas, avaliouse o efeito de luz e KNO 3 sob temperatura constante e alternada na germinação de sementes de A. conyzoides. Quatro subamostras de 75 sementes para cada tratamento foram submetidas à combinação fatorial de luz (escuro; 12 horas de luz) e KNO 3 (0% de KNO 3 ; 0,2% de KNO 3 ) para os ensaios a 25°C constante e a 15ºC/35ºC por 12h/12h, em delineamento inteiramente casualizado. Efetuou-se a contagem diária das ocorrências germinativas durante 21 dias. Em temperatura constante, a presença de luz aumentou a porcentagem e a velocidade de germinação e o KNO 3 reduziu a porcentagem e a velocidade de germinação de sementes de A. conyzoides no escuro. Na temperatura constante houve ajuste da curva de germinação acumulada ao modelo exponencial. Na temperatura alternada, o KNO 3 na presença de luz aumenta a porcentagem e a velocidade de germinação de sementes de A. conyzoides. Em temperaturas alternadas, houve ajuste da curva de germinação acumulada ao modelo logístico, demonstrando maior assincronia na germinação das sementes no tempo do que em temperatura constante.Termos para indexação: curva de germinação acumulada, dormência, KNO 3 , mentrasto, velocidade de germinação. LIGHT AND KNO 3 ON Ageratum conyzoides L. SEED GERMINATION AT CONSTANT AND ALTERNATING TEMPERATUREABSTRACT -Ageratum conyzoides is a weed with tropical origin that shows expressive presence in the seedbanks where it occurs. Considering the importance of knowing the factors that affect seed germination in weed species management, the effect of light and KNO 3 at constant and alternating temperature on Ageratum conyzoides seed germination was evaluated. Four sub samples of 75 seeds for each treatment were submitted to the factorial combination of light (darkness; 12 hours light) and KNO 3 (0% KNO 3 ; 0,2% KNO 3 ) for the assay at 25°C constant and at 15ºC/35ºC for 12h/12h in a randomized complete block design. Germination occurrence was evaluated daily for 21 days. At constant temperature, light promoted the percentage and the speed of germination and KNO 3 reduced the germination percentage and speed of A. conyzoides seeds in darkness. The curve of accumulated germination was adjusted to the exponential model at constant temperature.

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“…Radicle elongation of wheat, on the other hand, was greatly inhibited in both the hypotonic (127.8 mm) and hypertonic (89.3 mm) osmotic controls when compared to di H 2 O (200.0 mm). Boyd et al (2004) [40] found that the germination percentage of canola (84%, 42%, and 15%), wheat (83%, 69%, and 40%), and wild oat (42%, 11%, and 1%) decreased with increasing solute concentration in −0.01, −0.5, and −1.00 MPa polyethylene glycol 6000 solutions, respectively. Differences in response species germination between our study and that of Boyd et al (2004) [40] could be due to the presence of soil as a germination medium in our microcosm assay.…”

Section: Discussionmentioning

confidence: 97%

The Allelopathic Potential of Hairy Vetch (Vicia villosa Roth.) Mulch

Geddes¹,

Cavalieri²,

Daayf³

et al. 2015

AJPS

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Hairy vetch (Vicia villosa Roth.) has been recognized as a good candidate for weed suppressive mulch in organic no-till cropping systems. In our study, the allelopathic potential of hairy vetch, fall rye (Secale cereale L.) and winter wheat (Triticum aestivum L.) (extracted species) were evaluated at both vegetative and reproductive developmental stages (extract stage) based on the germination and radicle elongation of five response species using aqueous extracts in soil microcosms. Our study found hairy vetch shoot extract to have little allelopathic potential compared to fall rye or winter wheat, both species for which the allelopathic potential is well documented. Interestingly, hairy vetch was the only extracted species to increase in allelopathic suppression of radicle elongation at the reproductive stage when plant biomass is near maximum. This result was conceivably due to the increased concentration of the putative allelochemical cyanamide in reproductive tissue. Chemical inhibition of radicle elongation in this extract, however, was only observed in the domesticated response species wheat (Triticum aestivum L.) and canola (Brassica napus L.). The allelopathic effect on germination varied and depended on extracted species, extract stage, and response species; whereas the effect on radicle elongation was similar among extracted species, yet unique within response species. This research demonstrated that allelopathy studies should include multiple allelopathic and response species to accurately quantify the magnitude of chemical effects among allelopathic species and to rule out potential phytotoxic chemical defense/detoxification mechanisms that exist in some response species.

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Seed germination of common weed species as affected by oxygen concentration, light, and osmotic potential

Cited by 55 publications

References 36 publications

Germinação De Sementes De Capim-Arroz Submetidas a Condições De Luz E Temperatura

Germinação De Sementes De Capim-Arroz Submetidas a Condições De Luz E Temperatura

Luz e KNO3 na germinação de sementes de Ageratum conyzoides L. sob temperaturas constantes e alternadas

The Allelopathic Potential of Hairy Vetch (Vicia villosa Roth.) Mulch

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