Seed Germination Ecology of Echinochloa glabrescens and Its Implication for Management in Rice (Oryza sativa L.)

Opeña, Jhoana L.; Chauhan, Bhagirath Singh; Baltazar, Aurora M.

doi:10.1371/journal.pone.0092261

Cited by 36 publications

(46 citation statements)

References 30 publications

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“…These germination values were similar to those recorded in previous studies on E. glabrescens Munro ex Hook in which at a salt concentration of 200 mM the germination was more than 60% and averaged about 73% at 250 mM NaCl (Opeña et al, 2014); similar germination level (68%) was also found on E. crus-galli at a salt concentration of 225 mM (Sadeghloo et al, 2013). Conversely, in trials carried out by Chauhan and Johnson (2009), germination of E. colona (L.) Link was totally inhibited at the salt concentration of 200 mM.…”

Section: Germination Capacitysupporting

confidence: 91%

“…At the same NaCl concentration Sadeghloo et al (2013) found that germination was completely inhibited. Previous studies on E. colona and E. glabrescens also found a linear decrease of germination with the increase of salt concentration (Chauhan and Johnson, 2009;Opeña et al, 2014). The EC50 for germination capacity was the lowest for the resistant population r2 (EC50 274.47 mM), while the highest for the sensitive population s3 (EC50 380.73 mM) ( Table 2).…”

Section: Germination Capacitymentioning

confidence: 55%

“…Salt solutions were prepared by dissolving NaCl in deionized water at the following concentrations: 0 mM, 50 mM, 100 mM, 150 mM, 200 mM, 250 mM, 300 mM, 350 mM, and 400 mM. These nine salt concentrations were selected among those applied in previous studies (Chauhan and Johnson, 2009;Sadeghloo et al, 2013;Opeña et al, 2014) and according to the water salinity levels found in some European rice cultivation areas (Isla et al, 2003;Gay et al, 2010;Moret-Fernández and Herrero, 2015) in order to be able to compare the results of our trial with those found in other studies carried out in analogous conditions and in order to use saline concentrations that can be found in the area from which the six common barnyard grass populations tested came from. The number of doses was selected following the guidelines provided by Holland-Letz and Kopp-Schneider (2015).…”

Section: Effect Of Water Salinity On Germinationmentioning

confidence: 99%

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Effect of salinity on Echinochloa crus-galli germination as affected by herbicide resistance

Serra¹,

Fogliatto²,

Vidotto³

2018

Ital J Agronomy

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Salinity is one of the major abiotic stresses that may affect yield and quality of crops. Salinization, in combination with the presence of aggressive weeds, such as barnyard grass (Echinochloa spp.), can be considered one of the factors responsible for reducing yield in rice fields. The aims of the study were to evaluate the salt effect on germination and first seedling growth of six different Italian common barnyard grass (E. crus-galli) populations (three sensitive and three resistant to ALS-inhibitor herbicides) and to verify the presence of differences in salt response between populations sensitive and resistant to the ALS-inhibitor herbicides. Germination tests were conducted under nine different NaCl concentrations (from 0 mM to 400 mM). Significant differences in germination capacity were found between sensitive and resistant populations from 0 mM to 250 mM NaCl; in particular, germination capacity of the sensitive populations was higher (up to 90%) than that of the resistant ones (about 70%). The increase in salinity over 250 mM reduced progressively the germination capacity: from 300 mM onwards, no significant differences were found between sensitive and resistant populations and the germination resulted inhibited for two of them (one sensitive and one resistant). Speed of germination and root and shoot length of seedlings were also inversely related to salt concentration. Time required for achieving 50% of final germination capacity was extended from about three days at 0 mM NaCl up to about 10-12 days at 400 mM NaCl. Root length and shoot length ranged from 9.88 cm and 6.16 cm, at 0 mM NaCl, to 0.36 cm and 0.41 cm, at 400 mM NaCl. According to the results, there is no a clear evidence that response to saline conditions was related to resistance towards ALS-inhibitor herbicides, as in some cases significant differences were found between populations showing a similar herbicide sensitivity. Responses of barnyard grass to salinity are may play a role in the importance of this weed in future scenarios of salt intrusion: for example, a lower speed of germination at increasing salt levels could suggest a delayed emergence of this weed during crop establishment and first growth. To evaluate the real consequences in terms of competitions towards the crop, future studies are needed for assessing the response to salinity of the main rice varieties cultivated in the environment in which the E. crus-galli populations tested in this study were collected.

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Section: Germination Capacitysupporting

confidence: 91%

Section: Germination Capacitymentioning

confidence: 55%

Section: Effect Of Water Salinity On Germinationmentioning

confidence: 99%

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Effect of salinity on Echinochloa crus-galli germination as affected by herbicide resistance

Serra¹,

Fogliatto²,

Vidotto³

2018

Ital J Agronomy

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“…Previous studies found that some weed species, such as texasweed [Caperonia palustris (L.) St. (Opeña et al 2014) was significantly higher in light/dark conditions than in dark conditions. In our study, seeds could germinate in the dark, which indicates that light is not a prerequisite for germination of triquetrous murdannia.…”

Section: Resultsmentioning

confidence: 99%

Seed Germination, Seedling Emergence, and Response to Herbicides of Triquetrous Murdannia (Murdannia triquetra) in Rice

et al. 2016

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Triquetrous murdannia is an annual weed commonly found in rice fields in China. Laboratory and screenhouse experiments were carried out to determine the effect of light, temperature, osmotic and salt stress, seed burial depth, amount of rice residue, and depth of flooding on seed germination and seedling emergence of triquetrous murdannia and to evaluate the response of this weed to commonly available POST herbicides in China. Germination was greater than 93% under a wide day/night temperature range of 20/10 to 30/20 C in the light/dark regime. The time to onset of germination decreased as temperature increased. Germination was slightly stimulated when seeds were placed in light/dark conditions compared with seeds placed in the dark. The osmotic potential and NaCl concentration required for 50% inhibition of maximum germination were −0.5 MPa and 122 mM, respectively. The highest germination (68%) was observed from seeds sown on the soil surface, but decreased with increasing burial depth. Only 7% of seedlings emerged from a depth of 4 cm, and no seedlings emerged from seeds buried deeper than 6 cm. Seedling emergence decreased from 93 to 35% with increasing quantity of rice residue (1 to 6 10 3 kg ha −1 ) applied on the soil surface. Seedling emergence was reduced by 40, 48, 64, and 70% at flooding depths of 1, 2, 4, and 6 cm, respectively, for the seeds sown on the soil surface. Fluroxypyr and MCPA herbicides provided 100% control of triquetrous murdannia at the 2-to 6-leaf stages; however, to achieve 100% control with bispyribac-sodium, MCPA + bentazone or MCPA + fluroxypyr, herbicides had to be applied by the 4-leaf stage. The results of this study could help in developing more sustainable and effective integrated weed management strategies for the control of triquetrous murdannia in rice fields in China. Nomenclature: Bispyribac-sodium; fluroxypyr; MCPA; MCPA + bentazone; MCPA + fluroxypyr; triquetrous murdannia, Murdannia triquetra (Wall.) Bruckn.; rice, Oryza sativa L.

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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

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

et al. 2015

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Seed Germination Ecology of Echinochloa glabrescens and Its Implication for Management in Rice (Oryza sativa L.)

Cited by 36 publications

References 30 publications

Effect of salinity on Echinochloa crus-galli germination as affected by herbicide resistance

Effect of salinity on Echinochloa crus-galli germination as affected by herbicide resistance

Seed Germination, Seedling Emergence, and Response to Herbicides of Triquetrous Murdannia (Murdannia triquetra) in Rice

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

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