Biomass, Fecundity, and Interference Ability of Multiple Herbicide-Resistant and -Susceptible Late Watergrass (<i>Echinochloa phyllopogon</i>)

Boddy, Louis G.; Streibig, J. C.; Yamasue, Yuji; Fischer, Albert J.

doi:10.1614/ws-d-11-00150.1

Cited by 9 publications

(17 citation statements)

References 58 publications

(90 reference statements)

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“…Stronger similarities between the R populations KS and SW than between the S populations CR and HR in hydrotime model parameters (Table 1) and in final germination across Ψ and Ox levels (Figures 1 and 3) corroborate previous reports of reduced phenotypic variation among R populations compared to S [23], [27].…”

Section: Discussionsupporting

confidence: 88%

“…Populations CR and HR were subsequently classified as herbicide-susceptible (S) and populations KS and SW as herbicide-resistant (R) [16], [27]. In the summers of 2007 and 2009, 38 plants from each population were placed in separate greenhouses for seed multiplication at the University of California, Davis.…”

Section: Methodsmentioning

confidence: 99%

“…Populations AM (S) and RD (R) [16], [27] were added to the previous set of four populations to better distinguish between R and S seeds. After harvest in fall 2009, seeds were stored dry at 20°C until March 2010, when they were surface-sterilized and exposed to dormancy-release treatments as described in the following sections.…”

Section: Methodsmentioning

confidence: 99%

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Stratification Requirements for Seed Dormancy Alleviation in a Wetland Weed

2013

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Echinochloaoryzicola(syn.E. phyllopogon) is an exotic weed of California rice paddies that has evolved resistance to multiple herbicides. Elimination of seedlingsthroughcertain weed control methods can limit the spread of this weed, but is contingent on accurate predictions of germination and emergence timing, which are influenced by seed dormancy levels.In summer annuals, dormancy can often be relieved through stratification, a period of prolonged exposure to cold and moist conditions.We used population-based threshold models to quantify the effects of stratification on seed germination of four E. Oryzicola populations at a range of water potential (Ψ) and oxygen levels. We also determined how stratification temperatures, moisture levels and durations contributed to dormancy release. Stratification released dormancy by decreasing base Ψ and hydrotimerequired for germination and by eliminating any germination sensitivity to oxygen. Stratification also increased average germination rates (GR), which were used as a proxy for relative dormancy levels. Alternating temperatures nearly doubled GR in all populations, indicating that seeds could be partially dormant despite achieving high final germination percentages. Stratification at Ψ = 0 MPa increased GR compared to stratification at lower water potentials, demonstrating that Ψ contributed to regulating dormancy release. Maximum GR occurred after 2-4 weeks of stratification at 0 MPa; GR were often more rapid for herbicide-resistant than for herbicide-susceptible seeds, implying greater dormancy in the latter. Manipulation of field conditions to promote dormancy alleviation of E. oryzicola seeds might improve the rate and uniformity of germination for seed bank depletion through seedling weed control. Our results suggest field soil saturation in winter would contribute towards E. oryzicola dormancy release and decrease the time to seedling emergence.

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Section: Discussionsupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

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Stratification Requirements for Seed Dormancy Alleviation in a Wetland Weed

2013

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“…; Boddy et al . ), information is lacking on differences between R and S germination and emergence dynamics that could further contribute to control of R populations. The existence of such differences can be evaluated by studying multiple populations from diverse origins to assess whether those differences are consistently expressed through emergence variability (Vila‐Aiub, Neve & Roux ).…”

Section: Introductionmentioning

confidence: 99%

Population‐based threshold models describe weed germination and emergence patterns across varying temperature, moisture and oxygen conditions

Boddy

Bradford

Fischer

2012

Journal of Applied Ecology

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Summary1. Opportunities for diversifying the management of weedy populations may be enhanced through accurate predictions of seedling emergence, because the timing and success of control measures often hinges on the timing of weed emergence. We used population-based threshold models to establish the temperature, moisture and oxygen conditions for optimum germination of herbicide-resistant and -susceptible Echinochloa phyllopogon, a weed of temperate paddy rice, and applied them to predict emergence from field soil. 2. We combined hydrothermal time for germination, accounting for within-population variation in base water potentials (Ψ b ), with thermal time for early seedling growth to predict the quantity and proportional size of the emergence flushes that constitute final recruitment. 3. Emergence in field soils was reduced by moisture stress and flooding, especially for the resistant population. In all populations, germination rates increased between 9Á5 and 31°C, Ψ b was <À1Á0 MPa, and there was no sensitivity to oxygen supply. 4. Synthesis and applications. Population-based threshold models produced physiologically meaningful germination parameters, which are useful in defining the environmental constraints to germination, and predicting Echinochloa phyllopogon germination and emergence in field soils. By exploring the effects of temperature, water stress and flooding on germination and emergence, we predict irrigation regimes for optimising recruitment and the timing of weed control.

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“…This is borne out in published studies, for example, Boddy et al . (), and many studies cited therein (but not cited by Wang et al ., ). Wang et al .…”

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confidence: 99%

Overexpression of epsps transgene in weedy rice: insufficient evidence to support speculations about biosafety

Gressel

Stewart

Giddings³

et al. 2014

New Phytologist

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Editorial Note: the Letter from Gressel et al. states that sequence data were not supplied in Wang et al. (2014), despite this being a requirement of the Journal. In light of this, New Phytologist has taken steps to ensure that authors must, if their paper includes new sequence data, provide the relevant accession numbers. In addition, we have made our policy on data deposition explicit by amending our Author Guidelines. These now state that New Phytologist requires authors to make their data available to readers and interested parties upon reasonable request.

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Biomass, Fecundity, and Interference Ability of Multiple Herbicide-Resistant and -Susceptible Late Watergrass (Echinochloa phyllopogon)

Cited by 9 publications

References 58 publications

Stratification Requirements for Seed Dormancy Alleviation in a Wetland Weed

Stratification Requirements for Seed Dormancy Alleviation in a Wetland Weed

Population‐based threshold models describe weed germination and emergence patterns across varying temperature, moisture and oxygen conditions

Overexpression of epsps transgene in weedy rice: insufficient evidence to support speculations about biosafety

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