Wild oat （Avena ludoviciana） is one of the worst weeds in wheat fields. The effect of wheat density on wild oat competition with more or less competitive wheat cultivars （Triticum aestivum） was investigated at the...Wild oat （Avena ludoviciana） is one of the worst weeds in wheat fields. The effect of wheat density on wild oat competition with more or less competitive wheat cultivars （Triticum aestivum） was investigated at the Experimental Farm of Plant Pests and Diseases Research Institute, Karaj, Iran. The experiment was established as a factorial combination of wheat varieties Roshan as non-competitive and Niknejad as competitive; three wheat densities （recommended density, recommended＋25%, and recommended＋50%, corresponding respectively with 300, 375, and 450 plants m-2 for Roshan and 400, 500, and 600 plants m-2 for Niknejad） and four wild oat densities （0, 25, 50, and 75 plants m-2） were selected for this experiment. Hyperbolic equations were used to describe relationship between yield and weed density. Increase in wheat density reduced wild oat biomass. Maximum wild oat biomass was achieved at the highest density of the wild oat together with the lowest wheat density. The results showed that higher densities of wheat are able to suppress wild oat dry matter production. Inter-specific competition in Niknejad was 1.7 times more than that in Roshan. Maximum yields of Niknejad and Roshan in the presence of wild oat were obtained at recommended density＋25% and recommended density, respectively. Increase in wheat density leads to a decrease in wheat yield due to an increase in intra-specific competition. Increase in wild oat density results in the reduction of wheat yield through decrease in fertile tiller per plant and spike m-2.展开更多
为探明春油菜田野燕麦(Avena fatua L.)对高效氟吡甲禾灵抗性生理机制,在实验室对抗性生物型野燕麦和敏感性生物型喷施高效氟吡甲禾灵后测定了相关生理指标的变化,结果表明喷施高效氟吡甲禾灵EC375 m L/hm2后,野燕麦敏感种群(S)的叶绿...为探明春油菜田野燕麦(Avena fatua L.)对高效氟吡甲禾灵抗性生理机制,在实验室对抗性生物型野燕麦和敏感性生物型喷施高效氟吡甲禾灵后测定了相关生理指标的变化,结果表明喷施高效氟吡甲禾灵EC375 m L/hm2后,野燕麦敏感种群(S)的叶绿素含量呈逐渐降低的趋势,抗性种群(R)的叶绿素含量变化趋势不明显;野燕麦抗性种群(R)喷药处理后丙二醛含量始终很低,敏感种群(S)随着药剂胁迫时间的延长,施药与未施药处理后的丙二醛含量的差异明显;敏感野燕麦种群(S)施药和未施药处理后CAT的活性差异比较显著,抗性种群(R)施药后的CAT活性与未施药的CAT活性差异不显著。研究得出敏感野燕麦生物型生理变化较大,高抗野燕麦生物型具有一定的生理适应性,生理变化较小。展开更多
文摘Wild oat （Avena ludoviciana） is one of the worst weeds in wheat fields. The effect of wheat density on wild oat competition with more or less competitive wheat cultivars （Triticum aestivum） was investigated at the Experimental Farm of Plant Pests and Diseases Research Institute, Karaj, Iran. The experiment was established as a factorial combination of wheat varieties Roshan as non-competitive and Niknejad as competitive; three wheat densities （recommended density, recommended＋25%, and recommended＋50%, corresponding respectively with 300, 375, and 450 plants m-2 for Roshan and 400, 500, and 600 plants m-2 for Niknejad） and four wild oat densities （0, 25, 50, and 75 plants m-2） were selected for this experiment. Hyperbolic equations were used to describe relationship between yield and weed density. Increase in wheat density reduced wild oat biomass. Maximum wild oat biomass was achieved at the highest density of the wild oat together with the lowest wheat density. The results showed that higher densities of wheat are able to suppress wild oat dry matter production. Inter-specific competition in Niknejad was 1.7 times more than that in Roshan. Maximum yields of Niknejad and Roshan in the presence of wild oat were obtained at recommended density＋25% and recommended density, respectively. Increase in wheat density leads to a decrease in wheat yield due to an increase in intra-specific competition. Increase in wild oat density results in the reduction of wheat yield through decrease in fertile tiller per plant and spike m-2.
文摘为探明春油菜田野燕麦(Avena fatua L.)对高效氟吡甲禾灵抗性生理机制,在实验室对抗性生物型野燕麦和敏感性生物型喷施高效氟吡甲禾灵后测定了相关生理指标的变化,结果表明喷施高效氟吡甲禾灵EC375 m L/hm2后,野燕麦敏感种群(S)的叶绿素含量呈逐渐降低的趋势,抗性种群(R)的叶绿素含量变化趋势不明显;野燕麦抗性种群(R)喷药处理后丙二醛含量始终很低,敏感种群(S)随着药剂胁迫时间的延长,施药与未施药处理后的丙二醛含量的差异明显;敏感野燕麦种群(S)施药和未施药处理后CAT的活性差异比较显著,抗性种群(R)施药后的CAT活性与未施药的CAT活性差异不显著。研究得出敏感野燕麦生物型生理变化较大,高抗野燕麦生物型具有一定的生理适应性,生理变化较小。
