Differential Germination Characteristics of Dicamba-Resistant Kochia (<i>Bassia scoparia</i>) Populations in Response to Temperature

Kumar, Vipan; Jha, Prashant; Lim, Charlemagne A.; Stahlman, Phillip W.

doi:10.1017/wsc.2018.54

Cited by 9 publications

(11 citation statements)

References 42 publications

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“…Therefore, no distinctive behavior was observed in terms of the water stress adaptability of the GS and GR populations. All the populations might have faced different agronomic practices in their initial generations for a longer period and that could be the reason for varying water stress adaptability under different alternating temperature regimes [ 14 ]. In the current study, all populations were grown in the same environment at Gatton, Queensland.…”

Section: Resultsmentioning

confidence: 99%

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Differential germination characteristics of glyphosate-resistant and glyphosate-susceptible Chloris virgata populations under different temperature and moisture stress regimes

Desai

Chauhan

2021

PLoS ONE

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Thorough knowledge of the germination behavior of weed species could aid in the development of effective weed control practices, especially when glyphosate resistance is involved. A study was conducted using two glyphosate-resistant (GR) (SGW2 and CP2) and two glyphosate-susceptible (GS) (Ch and SGM2) populations of Chloris virgata, an emerging and troublesome weed species of Australian farming systems, to evaluate their germination response to different alternating temperature (15/5, 25/15 and 35/25°C with 12 h/12 h light/dark photoperiod) and moisture stress regimes (0, -0.1, -0.2, -0.4, -0.8 and -1.6 MPa). These temperature regimes represent temperatures occurring throughout the year in the eastern grain region of Australia. Seeds germinated in all the temperature regimes with no clear indication of optimum thermal conditions for the GR and GS populations. All populations exhibited considerable germination at the lowest alternating temperature regime 15/5°C (61%, 87%, 49%, and 47% for Ch, SGM2, SGW2, and CP2, respectively), demonstrating the ability of C. virgata to germinate in winter months despite being a summer annual. Seed germination of all populations was inhibited at -0.8 and -1.6 MPa osmotic potential at two alternating temperature regimes (15/5 and 35/25°C); however, some seeds germinated at 25/15°C at -0.8 MPa osmotic potential, indicating the ability of C. virgata to germinate in arid regions and drought conditions. Three biological parameters (T10: incubation period required to reach 10% germination; T50: incubation period required to reach 50% germination; and T90: incubation period required to reach 90% germination) suggested late water imbibition with increasing moisture stress levels. The GR population SGW2 exhibited a distinctive pattern in T10, T50, and T90, possessing delayed germination behaviour and thus demonstrating an escape mechanism against pre-plating weed management practices. Knowledge gained from this study will help in developing site-specific and multi-tactic weed control protocols.

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Section: Resultsmentioning

confidence: 99%

“…However, temperature, soil moisture, and photoperiod are considered the most impactful environmental factors on germination [13]. In previous studies on several weed species, it was observed that GR and glyphosate-susceptible (GS) populations possessed different germination characteristics [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Differential germination characteristics of glyphosate-resistant and glyphosate-susceptible Chloris virgata populations under different temperature and moisture stress regimes

Desai

Chauhan

2021

PLoS ONE

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“…Can we anticipate direct vs. indirect effects of herbicide resistance mutations on fitness? A number of traits, further from fitness (i.e., survival and fecundity) [28], related to development, phenology, metabolism, physiology, and morphology have been associated with a number of dissimilar herbicide resistance traits [59,60,66,70,71,72,73,74,75]. Inferences from these and other studies on the causal relationship between these life history and resistance traits are difficult to make.…”

Section: Fitness Costs May Arise As Direct Effects Of the Herbicidmentioning

confidence: 99%

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Vila‐Aiub

2019

Plants

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Herbicide resistance is the ultimate evidence of the extraordinary capacity of weeds to evolve under stressful conditions. Despite the extraordinary plant fitness advantage endowed by herbicide resistance mutations in agroecosystems under herbicide selection, resistance mutations are predicted to exhibit an adaptation cost (i.e., fitness cost), relative to the susceptible wild-type, in herbicide untreated conditions. Fitness costs associated with herbicide resistance mutations are not universal and their expression depends on the particular mutation, genetic background, dominance of the fitness cost, and environmental conditions. The detrimental effects of herbicide resistance mutations on plant fitness may arise as a direct impact on fitness-related traits and/or coevolution with changes in other life history traits that ultimately may lead to fitness costs under particular ecological conditions. This brings the idea that a “lower adaptive value” of herbicide resistance mutations represents an opportunity for the design of resistance management practices that could minimize the evolution of herbicide resistance. It is evident that the challenge for weed management practices aiming to control, minimize, or even reverse the frequency of resistance mutations in the agricultural landscape is to “create” those agroecological conditions that could expose, exploit, and exacerbate those life history and/or fitness traits affecting the evolution of herbicide resistance mutations. Ideally, resistance management should implement a wide range of cultural practices leading to environmentally mediated fitness costs associated with herbicide resistance mutations.

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“…Previous studies have demonstrated that B. scoparia populations in fallow fields from Central Great Plains (Figure 1) had earlier and quicker emergence patterns compared with populations from the NGP (Dille et al 2017;Kumar et al 2017a). Rapid seed germination has also been observed in B. scoparia resistant to ALS inhibitors, whereas reduced and delayed seed germination has been reported in dicamba-resistant B. scoparia (Dyer et al 1993;Kumar and Jha 2016;Kumar et al 2018b). Differential seed germination characteristics have also been found for GR B. scoparia in the region (Kumar and Jha 2017;Osipitan and Dille 2017).…”

Section: Cover Crops For Managing Herbicide-resistant Weeds In the Grmentioning

confidence: 89%

Integrating cover crops for weed management in the semiarid U.S. Great Plains: opportunities and challenges

et al. 2020

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The widespread evolution of herbicide resistance in weed populations has become an increasing concern for no-tillage (NT) growers in semiarid regions of the U.S. Great Plains. Lack of cost-effective and alternative new herbicide sites of action further exacerbates the problem of herbicide-resistant (HR) weeds and threatens the long-term sustainability of prevailing cropping systems in the region. A recent decline in commodity prices and increasing herbicide costs to manage HR weeds has spurred research efforts to build a strong rationale for developing ecologically based integrated weed management (IWM) strategies in the U.S. Great Plains. Integration of cover crops (CCs) in NT dryland production systems potentially offers several ecosystem services, including weed control, soil health improvement, decline in selective pest pressure, and overall reduction in pest management inputs. This review article aims to document the role of CCs for IWM, with emphasis on exploring emerging weed issues; ecological, economic, and agronomic benefits of growing CCs; and constraints preventing adoption of CCs in NT cropping systems in the semiarid Great Plains. We attempt to focus on changes in weed management practices, their long-term impacts on weed seedbanks, weed shifts, and herbicide-resistance evolution in the most common weed species in the region. We also highlight current knowledge gaps and propose new research priorities based on an improved understanding of CC management strategies that will ultimately aid in achieving sustainable weed management goals and preserving natural resources in water-limited environments.

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Differential Germination Characteristics of Dicamba-Resistant Kochia (Bassia scoparia) Populations in Response to Temperature

Cited by 9 publications

References 42 publications

Differential germination characteristics of glyphosate-resistant and glyphosate-susceptible Chloris virgata populations under different temperature and moisture stress regimes

Differential germination characteristics of glyphosate-resistant and glyphosate-susceptible Chloris virgata populations under different temperature and moisture stress regimes

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Integrating cover crops for weed management in the semiarid U.S. Great Plains: opportunities and challenges

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