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  • دکتری (1394)

    علوم علف های هرز

    دانشگاه آرهوس، آرهوس، دانمارک

  • کارشناسی‌ارشد (1386)

    شناسایی و مبارزه با علف های هرز

    تهران، تهران، ایران

  • 1. ارزیابی کارایی مصرف علف¬کش¬ها، مقاومت به علف¬کش¬ها و ارزیابی شایستگی علف¬های¬هرز مقاوم به علف¬کش¬ها
  • 2. بيولوژي، اكولوژي و فيزيولوژي علف¬های¬هرز با تاکید بر مدیریت و روش¬های کنترل آنها

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    ارتباط

    رزومه

    Effect of ultrasound waves, chilling and mechanical abrasion on dormancy-breaking and germination characteristics of Datura stramonium and Convolvulus arvensis

    H Ghafoori, E Keshtkar, M Aghaalikhani, A Mahdavian
    Journal Papers , , {Pages }

    Abstract

    Perspective: Common errors in dose–response analysis and how to avoid them

    E Keshtkar, P Kudsk, MB Mesgaran
    Journal Papers , , {Pages }

    Abstract

    Effect of drought stress on herbicide performance and photosynthetic activity of Avena sterilis subsp. ludoviciana (winter wild oat) and Hordeum spontaneum (wild …

    S Alizade, E Keshtkar, A Mokhtassi‐Bidgoli, H Sasanfar, JC Streibig
    Journal Papers , , {Pages }

    Abstract

    Differences in growth, development and innate seed dormancy of susceptible and fenoxaprop-P non-target site resistant black-grass sub-populations

    Eshagh Keshtkar, Solvejg K Mathiassen, Majid AghaAlikhani, Per Kudsk
    Journal PapersCrop Protection , Volume 129 , 2020 March 1, {Pages 105022 }

    Abstract

    Alopecurus myosuroides Huds. is the most abundant herbicide-resistant weed species in Western Europe. Herbicide resistance management programs may rely, amongst other things, on information about fitness of resistant sub-population i.e. the number of offspring a genotype produces and contributes to next generation. Growth and phenological development of susceptible (S) and fenoxaprop-P resistant (R) A. myosuroides sub-populations from a non-target site resistant (NTSR) Danish population was studied for two years, while the primary seed dormancy of the populations was evaluated for three years. The genetic background of the S and R sub-populations was controlled using a plant cloning technique. No statistically significant differences were o

    Germinability and seed biochemical properties of susceptible and non-target-site herbicide-resistant blackgrass (Alopecurus myosuroides) sub-populations exposed to abiotic stresses

    Zahra Ghazali, Eshagh Keshtkar, Majid AghaAlikhani, Per Kudsk
    Journal PapersWeed Science , 2020 January , {Pages 31-Jan }

    Abstract

    Quantifying the level of ecophysiological, biochemical, and agronomical fitness of herbicide-resistant (R) and herbicide-susceptible (S) weeds is useful for understanding the evolutionary development of herbicide resistance, but also for implementing herbicide-resistance management strategies. Although germination is a key fitness component in the life cycle of weeds, germinability of S and R weeds has rarely been evaluated under stressful conditions. Germinability traits of S and non–target site resistant subpopulations of blackgrass (Alopecurus myosuroides Huds.) sharing closely related genetic background were tested under salinity, drought stress, and accelerated seed-aging (i.e., exposed to 100% relative humidity at 45 C from 0 to 134

    Quantifying the detrimental effect of airborne dust on herbicide efficacy

    Masoud Asadi-Sabzi, Eshagh Keshtkar, Ali Mokhtassi-Bidgoli, Stephen R. Moss
    Journal PapersWeed Research , 2020 January , {Pages }

    Abstract

    One side effect of human activity and global climatic change is more airborne dust. This not only has undesirable effects on human health and the environment, but may also adversely affect many agricultural processes, including herbicide efficacy. This is particularly relevant in parts of the world where dust storms are common and limited rainfall means dust persists on plants for protracted periods. Accordingly, a series of greenhouse dose–response pot experiments was carried out to quantify the effect of a dust concentration of 1,500??g/m3 on the performance of paraquat, glyphosate, sulfosulfuron and 2,4‐D+MCPA. Dust‐treated and untreated seedlings of Hordeum spontaneum and Sinapis arvensis were sprayed with sulfosulfuron and 2,4??

    Effect of water deficit stress on benzoylprop-ethyl performance and physiological traits of winter wild oat (Avena sterilis subsp. ludoviciana)

    Saeid Alizade, Eshagh Keshtkar, Ali Mokhtasi-Bidgoli, Hamidreza Sasanfar, Jens C Streibig
    Journal PapersCrop Protection , Volume 137 , 2020 November 1, {Pages 105292 }

    Abstract

    Increasing the diversity in the sites of action of herbicides is an important method for delaying and preventing herbicide resistance in weed populations. Benzoylprop-ethyl, a lipid biosynthesis inhibitor, is used to increase the diversity of herbicide sites of action and control ACCase- and ALS-resistant Avena sterilis subsp. ludoviciana (Durieu.) Gillet & Magne) populations in Iran. Drought stress, especially in arid and semiarid areas, affects weed physiology and performance of herbicides. Accordingly, a series of dose-response assays was conducted to evaluate the efficacy of benzoylprop-ethyl under drought- (60% Field Capacity) and non-drought-stress (90% Field Capacity) conditions on A. sterilis subsp. ludoviciana. Also, some biochemic

    Greece Attention should be devoted to weeds evolving herbicide resistance with non-target-site resistance (NTSR) mechanism due to their unpredictable resistance patterns?…

    Ana Leonor Scopel, Eshagh Keshtkar, E Keshtkar, SK Mathiassen, P Kudsk
    Journal PapersHerbicide Resistance in Weeds: Early Detection, Mechanisms, Dispersal, New Insights and Management Issues , 2020 October 28, {Pages }

    Abstract

    (Lehnhoff et al., 2013) to develop robust resistance management programs (Park et al., 2004; Vila-Aiub et al., 2011). For instance, Gly-2078 ACCase allele conferring resistance to fenoxaprop-P-ethyl and clodinafop-propargyl in a black-grass population was associated with a fitness cost, hence using competitive crops like alfalfa in crop rotation programs can strongly hamper the development and seed production of plants carrying the

    Improved two-step analysis of germination data from complex experimental designs

    Signe M Jensen, Dustin Wolkis, Eshagh Keshtkar, Jens C Streibig, Christian Ritz
    Journal PapersSeed Science Research , Volume 30 , Issue 3, 2020 September , {Pages 194-198 }

    Abstract

    Germination experiments are becoming increasingly complex and they are now routinely involving several experimental factors. Recently, a two-step approach utilizing meta-analysis methodology has been proposed for the estimation of hierarchical models suitable for describing data from such complex experiments. Step 1 involves fitting models to data from each sub-experiment, whereas Step 2 involves combination estimates from all model fits obtained in Step 1. However, one shortcoming of this approach was that visualization of resulting fitted germination curves was difficult. Here, we describe in detail an improved two-step analysis that allows visualization of cumulated data together with fitted curves and confidence bands. Also, we demonstr

    Greece Attention should be devoted to weeds evolving herbicide resistance with non-target-site resistance (NTSR) mechanism due to their unpredictable resistance patterns …

    AL Scopel, E Keshtkar, E Keshtkar, SK Mathiassen, P Kudsk
    Journal Papers , , {Pages }

    Abstract

    یبسن یگتسیاش پیتویب مد یاه یهابور (هدیشک‎

    Z Ghazali, E Keshtkar, M AghaAlikhani, P Kudsk
    Journal Papers , , {Pages }

    Abstract

    Assessing fitness costs from a herbicide-resistance management perspective: a review and insight

    Eshagh Keshtkar, Roohollah Abdolshahi, Hamidreza Sasanfar, Eskandar Zand, Roland Beffa, Franck E Dayan, Per Kudsk
    Journal PapersWeed Science , Volume 67 , Issue 2, 2019 March , {Pages 137-148 }

    Abstract

    In recent years, herbicide resistance has attracted much attention as an increasingly urgent problem worldwide. Unfortunately, most of that effort was focused on confirmation of resistance and characterization of the mechanisms of resistance. For management purposes, knowledge about biology and ecology of the resistant weed phenotypes is critical. This includes fitness of the resistant biotypes compared with the corresponding wild biotypes. Accordingly, fitness has been the subject of many studies; however, lack of consensus on the concept of fitness resulted in poor experimental designs and misinterpretation of the ensuing data. In recent years, methodological protocols for conducting proper fitness studies have been proposed; however, we

    Effect of dust on the growth and physiological traits of wild mustard (Sinapis arvensis L.) and wild barley (Hordeum spontaneum [K. Koch] Thell.) in the greenhouse conditions

    Sabzi Masoud Asadi, Eshagh Keshtkar, BIDGOLI ALI MOKHTASSI
    Journal Papers , Volume 15 , Issue 100654, 2019 January 1, {Pages 29-39 }

    Abstract

    To evaluate the effect of dust on the growth and physiological properties of wild mustard (Sinapis arvensis) and wild barley (Hordeum spontaneum), a greenhouse experiment was conducted in the Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran during 2016 and 2017. The experiment was repeated twice in the same greenhouse condition with eight weeks' interval. The pots were arranged in a completely randomized design with four replications. Analysis of variance was done as factorial split in time. The factorial combination of two weeds species (wild mustard and wild barley), and three dust concentrations (0, 750 and 1500 μ g m-3) were as the main factors, and four harvest times (8 leaves (BBCH-18), beginning of stem elongation (B

    Sinapis arvensis L. هردوج و

    Masoud Asadi-Sabzi, Eshagh Keshtkar, Ali Mokhtassi-Bidgoli
    Journal PapersIranian Journal of Weed Science , Volume 15 , Issue 1, 2019 January , {Pages 29-39 }

    Abstract

    Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran during 2016 and 2017. The experiment was repeated twice in the same greenhouse condition with eight weeks' interval. The pots were arranged in a completely randomized design with four replications. Analysis of variance was done as factorial split in time. The factorial combination of two weeds species (wild mustard and wild barley), and three dust concentrations (0, 750 and 1500 ?g m-3) were as the main factors, and four harvest times (8 leaves (BBCH-18), beginning of stem elongation (BBCH-30), beginning of flowering (BBCH-61) and beginning of fruit developing (BBCH-71)) were as the sub-factors. Results indicated that total fresh and dry weights were reduced with increasing th

    Effect of dust on the growth and physiological traits of wild mustard (Sinapis arvensis L.) and wild barley (Hordeum spontaneum [K. Koch] Thell.) in the greenhouse conditions.

    AS Masoud, K Eshagh, MB Ali
    Journal Papers , , {Pages }

    Abstract

    A note on the analysis of germination data from complex experimental designs

    Signe M Jensen, Christian Andreasen, Jens C Streibig, Eshagh Keshtkar, Christian Ritz
    Journal PapersSeed Science Research , Volume 27 , Issue 4, 2017 December , {Pages 321-327 }

    Abstract

    In recent years germination experiments have become more and more complex. Typically, they are replicated in time as independent runs and at each time point they involve hierarchical, often factorial experimental designs, which are now commonly analysed by means of linear mixed models. However, in order to characterize germination in response to time elapsed, specific event-time models are needed and mixed model extensions of these models are not readily available, neither in theory nor in practice. As a practical workaround we propose a two-step approach that combines and weighs together results from event-time models fitted separately to data from each germination test by means of meta-analytic random eff

    Seed Germination and Seedling Emergence of Blackgrass (Alopecurus myosuroides) as Affected by Non–Target-Site Herbicide Resistance

    Eshagh Keshtkar, Solvejg K Mathiassen, Roland Beffa, Per Kudsk
    Journal PapersWeed science , Volume 65 , Issue 6, 2017 November , {Pages 732-742 }

    Abstract

    Seedling emergence traits of susceptible (S) and resistant (R) blackgrass subpopulations isolated from a single non–target-site resistant (NTSR) population were studied in controlled conditions. The seedling emergence of the R subpopulation was lower and slower than that of the S subpopulation, especially at low temperature and deep burial. The burial depth inhibiting final emergence by 50% for the R subpopulation was significantly lower than that of the S subpopulation at low temperature. The present study revealed that under suboptimal conditions the NTSR loci conferring herbicide resistance were correlated with a fitness cost in relation to seedling emergence traits. The results suggest that deep soil cultivation and d

    No vegetative and fecundity fitness cost associated with acetyl-coenzyme A carboxylase non-target-site resistance in a Black-grass (Alopecurus myosuroides Huds) population

    Eshagh Keshtkar, Solvejg K Mathiassen, Per Kudsk
    Journal PapersFrontiers in plant science , Volume 8 , 2017 November 28, {Pages 2011 }

    Abstract

    Attention should be devoted to weeds evolving herbicide resistance with non-target-site resistance (NTSR) mechanism due to their unpredictable resistance patterns. Quantification of fitness cost can be used in NTSR management strategies to determine the long-term fate of resistant plants in weed populations. To our knowledge, this is the first report evaluating potential fecundity and vegetative fitness of a NTSR black-grass (Alopecurus myosuroides Huds), the most important herbicide resistant weed in Europe, with controlled genetic background. The susceptible (S) and NTSR sub-populations were identified and isolated from a fenoxaprop-P-ethyl resistant population by a plant cloning technique. Using a target-neighbourhood design, competitive

    Resistance profile of herbicide-resistant Alopecurus myosuroides (black-grass) populations in Denmark

    E Keshtkar, SK Mathiassen, SR Moss, P Kudsk
    Journal PapersCrop Protection , Volume 69 , 2015 March 1, {Pages 83-89 }

    Abstract

    Alopecurus myosuroides Huds is one of the most important grass-weeds in North-western Europe and is also the most important herbicide-resistant weed species in European agricultural systems. Fifty-three Danish A.?myosuroides populations, previously confirmed to be fenoxaprop-P resistant, were evaluated for five and two known mutation points within the ACCase and ALS genes, respectively. The resistance pattern of 28 out of the 53 populations was investigated to four herbicides using a seed bioassay technique. A whole plant dose response experiment was conducted on seven populations in 2012 and 2013 to evaluate the accuracy of the seed bioassay results. Two resistant populations from the UK and a susceptible population from Denmark were inclu

    Germination and dormancy of susceptible and non-target site fenoxaprop resistant phenotypes in a single Danish blackgrass population

    Eshagh Keshtkar, Solvejg K Mathiassen, Per Kudsk
    Conference PapersHerbicide resistance in Europe , 2015 January , {Pages }

    Abstract

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    دروس نیمسال جاری

    • كارشناسي ارشد
      نحوه عمل و كاربرد علف كش ها ( واحد)
      دانشکده کشاورزی، گروه زراعت
    • كارشناسي ارشد
      مديريت تلفيقي علف هاي هرز ( واحد)

    دروس نیمسال قبل

    • دكتري
      اكولوژي بذر ( واحد)
      دانشکده کشاورزی، گروه زراعت
    • 1399
      ازادحيدرابادي, فاطمه
      بررسي شايستگي نسبي بيوتيپ هاي حساس و مقاوم علف انگشتي پردار (Chloris radiata L.) به علف كش گلايفوسيت از نظر جوانه زني در شرايط آزمايشگاه
    • 1398
      زارعي چقااللهي, ابراهيم
      ارزيابي كنترل شيميايي علف‌هاي‌هرز در كاملينا (Camelina sativa)
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      داده ای یافت نشد
    • برنده جایزه دکتر کاظم آشتیانی بنیاد ملی نخبگان
    • رتبه اول آزمون دکتری دانشگاه تهران در سال 1388 در رشته علوم علف¬های¬هرز
    • رتبه دوم کنکور سراسری کارشناسی ارشد رشته شناسایی و مبارزه با علف¬های هرز سال 1384

    مهم

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