Open AccessJournal Article
Effect of temperature and light on germination behavior of PSII inhibiting herbicide resistant and susceptible junglerice ('Echinochloa colona') populations
Elham Elahifard,Sajad Mijani +1 more
TL;DR: Resistance to triazine and triazinone herbicides not only did not have created negative effect on germination characteristics of R-biotype but also had created competitive advantage in its germination behavior.
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Abstract: Repeated use of triazine herbicides have resulted in evolution of triazine resistant junglerice (Echinochloa colona) populations in southwestern Iran Experiments were conducted under controlled conditions to investigate the effect of temperature and light on germination of two triazine-resistant (R2 and R3) and one susceptible (S) junglerice populations The germination response was evaluated at nine constant temperatures of 10, 15, 20, 25, 30, 35, 40, 45 and 50 degreesC and two alternating temperature regimes of 20/10 and 30/20 degreesC For each population, the cumulative germination over time was modeled using a Weibull model The three-piece segmented model was also used to describe the cardinal temperatures for the germination rate of junglerice populations The R2 population was greatest germination in both temperature regimes The time taken to reach 50% germination (t50) decreased with the increasing temperature in all populations Based on the three-piece segmented model outputs, the base, the lower optimum, the upper optimum and the maximum temperatures for the germination were estimated to be 965, 2212, 3405 and 4525 degreesC for S population Also, these values were 977, 2048, 3573 and 4990 degreesC for R2 population and 989, 2214, 3033 and 4608 degreesC for R3 population Germination of all populations was stimulated after the transfer of seeds kept in darkness to the light We suppose resistance to triazine and triazinone herbicides not only did not have created negative effect on germination characteristics of R-biotype but also had created competitive advantage in its germination behavior
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Citations
Predicting junglerice (Echinochloa colona L.) emergence as a function of thermal time in the humid pampas of Argentina
TL;DR: Junglerice (Echinochloa colona) is one of the most important annual weeds affecting crops in Argentina and a predictive seedling emergence model based on thermal time was developed and validated.
Temperature Effects on Glyphosate Resistance in California Populations of Junglerice
TL;DR: It was showed that GR junglerice was susceptible to glyphosate when grown under 15/10°C suggesting that the prevalence of GR plants in the fields could be reduced if glyphosate applications were made in spring when temperatures were at or below 15°C when the plants were just emerging or had developed less than six leaves.
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Fitness Outcomes Related to Glyphosate Resistance in Kochia (Kochia scoparia): What Life History Stage to Examine?
TL;DR: Evaluating plant fitness at different life history stages can increase the potential of detecting fitness costs of glyphosate resistance, and weed management plans should integrate practices that take advantage of the relatively poor germination characteristics of GR kochia.
References
Altered target sites as a mechanism of herbicide resistance
Malcolm D. Devine,Amit Shukla +1 more
TL;DR: In this article, a review of target site-based herbicide resistance is presented, with emphasis on the biochemical and molecular basis for resistance, and the mutation and its effect on protein steric and electronic properties.
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Ecological fitness of a multiple herbicide‐resistant Lolium rigidum population: dynamics of seed germination and seedling emergence of resistant and susceptible phenotypes
TL;DR: This is the first attempt to compare the germination and seedling emergence characteristics of one herbicides-susceptible and two herbicide-resistant phenotypes from a single weed population.
137
Simulating evolution of glyphosate resistance in Lolium rigidum II: past, present and future glyphosate use in Australian cropping
TL;DR: A herbicide resistance model, parameterized for Lolium rigidum has been used to perform a number of simulations to compare predicted rates of evolution of glyphosate resistance under past, present and projected future use strategies, and found risks of glyphosate and paraquat resistance were reduced.
Simulating evolution of glyphosate resistance in Lolium rigidum I: population biology of a rare resistance trait
TL;DR: Together, the timing of glyphosate applications, the rarity of glyphosate-resistant mutants, the incomplete dominance ofosate-resistant alleles and pleiotropic fitness costs associated with glyphosate resistance, all contribute to its relatively slow evolution in the field.
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