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      • Open Access Article

        1 - The investigation of Allelopathic potential of 70 wheat (Triticum aestivum) cultivars on germination and seedling growth of volunteer canola (Brassica napus)
        Narges Mohamadi Elias Soltani Mostafa Oveisi Hossein Ramshini
        Allelopathic effects of plant can be one of the best ways to reduce the applying of herbicides which are high costly to register and have environmental effects. Therefore, the aim of this study was to investigate the allelopathic effects of wheat cultivars and to identi More
        Allelopathic effects of plant can be one of the best ways to reduce the applying of herbicides which are high costly to register and have environmental effects. Therefore, the aim of this study was to investigate the allelopathic effects of wheat cultivars and to identify the ability of them to control weeds. a field and laboratory experiment was conducted in Research Farm and Seed Technology laboratory of Aburaihan Campus, University of Tehran, during 2015-16. Seeds of 70 wheat cultivars were sown at 600 square meters of Research Farm and samples were taken for bioassay at the tillering stage. To separate the impact of allelopathic extract and osmotic potential of the extracts, different solutions were made with the same osmotic potential for each extract. Then, experiments simultaneously were conducted to investigate the effects of extract and osmotic potential on germination of canola. The results of separations of allelopathic and osmotic potential effects of extractions showed that the inhibition of canola germination is related to allelopathic effects and not osmotic potential of extraction (PEG). Results indicated that allelopathic effects of wheat cultivars had slightly increased during the releasing period of cultivars from 1940 until now, but this increase was not significant. This shows that breeders had not attention to allelopathy of wheat cultivars during breeding programs. Results indicated that there were some cultivars with high allelopathy and it is possible to include them in breeding programs to produce cultivars with high potential of weeds control. Manuscript profile
      • Open Access Article

        2 - Investigation of seed germination changes of wild mustard (Sinapis arvensis) during dormancy elimination
        hakimeh Rahimi Benjamin Torabi Elias Soltani farshid Ghaderifar
        In order to investigate the changes in cardinal temperatures of wild mustard seed germination during the dormancy elimination, a split plot experiment was conducted as completely randomized design in three replications in the Seed Research Laboratory of Agricultural and More
        In order to investigate the changes in cardinal temperatures of wild mustard seed germination during the dormancy elimination, a split plot experiment was conducted as completely randomized design in three replications in the Seed Research Laboratory of Agricultural and Resource University Natural Gorgan in 2017. The main factor was different temperatures (5, 10, 15, 20, 25 and 30°C) and sub-factor was different concentrations of gibberellic acid (GA: 0, 100, 300, 500, 1000, 1500, 2000 ppm). A dent-like function was used to describe the response of the germination rate to temperature. For different germination stages, the base temperature decreased from 2.9 to 3.4 °C in GA0 towards -1.2 to -2/0 °C in GA2000; the ceiling temperature was 25 °C at GA0 and increased to 33.3 °C in GA2000; the temperature tolerance range from 21.6 to 22.1 °C in GA0 reached 32.4 to 35.1 °C in GA2000. Due to cardinal temperature changes, the dormancy of wild mustard is a non-deep physiological dormancy type 1. Seeds with dormancy initially have the highest germination at low temperatures, and when they come out of dormancy, they germinate at high temperatures and the temperature range of germination increase. The estimated parameters in the present study can be useful in simulation models of seed bank and for further studies on the biology and ecology of wild mustard. Manuscript profile
      • Open Access Article

        3 - Investigation of seed germination of wild mustard during cold stratification
        hakimeh Rahimi Benjamin Torabi Elias Soltani Farshid Ghaderifar-Far
        In order to investigate the variation in cardinal temperature of wild mustard seed germination during the removal of dormancy, a split plot experiment based on a completely randomized design with three replications was conducted at Seed Research Laboratory of Gorgan Uni More
        In order to investigate the variation in cardinal temperature of wild mustard seed germination during the removal of dormancy, a split plot experiment based on a completely randomized design with three replications was conducted at Seed Research Laboratory of Gorgan University of Agricultural Sciences and Natural Resources in 2017. The main factor was different temperatures (5, 10, 15, 20, 25 and 30 °C) and different periods of chilling (0, 2, 4, 6 and 8 days at 5 °C) were assigned as the sub-factor. To describe the response of germination rate to temperature, a dent function was used. For different germination stages, the base temperature decreased from 2.9 to 3.4 °C in control seeds to 1.5 to 1.8 °C in 4 days chilling. Ceilings temperature in control seeds was 25 °C, which increased to 29.9 to 32.9 °C as a result of 6 chilling for 6 days. Due to cardinal temperature changes, the physiological dormancy of wild mustard is of type I. Dormant seeds originally have the highest germination at low temperatures, and they germinate at high temperatures after elimination of dormancy. Also, the germination temperature range increases. Estimated parameters in this study can be useful in seed bank simulation models and for further studies on wild mustard biology and ecology Manuscript profile