جستجوی مقالات مرتبط با کلیدواژه « انتقال الکترون » در نشریات گروه « کشاورزی »

To evaluate the impact of the components of climate change on the photosynthetic efficiency and grain yield of four dryland wheat genotypes (Sardari, Ohadi, Varan, and Ivan), an experiment was carried out in two conditions of the controlled environment and the field conditions in the 2021-2022 growing season. In the controlled environment, a split-plot experiment based on a randomized complete block design including temperature (25±3°C and 34±3°C) in the main plots, carbon dioxide (380 to 480 and 800 to 900 ppm) in sub-plots and drought stress (normal and water stress) were placed in sub-sub-plots. In the field conditions, a split plot experiment based on RCBD was carried out with three planting dates of 7, 22 October, and 6 November in the main plots and cultivars in the sub-plots. The components of climate change in all cultivars reduced Fmʹ and led to an increase in NPQ, and the activation of the non-photochemical quenching pathway and thermal energy dissipation through the Xanthophyll cycle and reduced ETR. The interaction effect of temperature and high carbon dioxide in all cultivars and heat in Sardari, Ohadi, and Ivan cultivars had higher electron transfer rates than other factors. On the first planting date, due to the adaptation of the plants to the environmental conditions grain yield was more by 23% and 100% than that of the second and third dates of sowing. It was concluded that despite the stress conditions dryland wheat genotypes have a suitable adaptation for energy disposal in the photosynthetic system.

To study the effect of castor oil combination with different doses of Lumax (mesotrion + s-metolacholor + terbuthylazine) on physiological behavior of common cocklebure (Xanthium strumarium L.), a greenhouse factorial experiment was conducted in randomized complete block design with 3 replications in Agricultural Faculty of University of Tabriz in 2017. Results showed that by increasing the herbicide doses, area above the OJIP curve between minimum and maximum fluorescence, maximum Fluorescence, variable fluorescence, maximum quantum yield of photochemistry (Fv/Fm), water-splitting complex on the donor side of PSII and maximum electron transport flux per PSII reaction center, decreased 35, 15/6, 23/6, 11, 43 and 83%, respectively and minimum fluorescence and thermal dissipation quantum yield increased 14 and 60%, respectively. Castor oil had synergistic effect on Lomax and enhanced its efficacy on X. strumarium. A good relationship was observed between Fv/Fm parameter evaluated 2 days after herbicide spraying (DAHS) and dry weight measured 28 DAHS. The finding of this study showed that evaluating chlorophyll a fluorescence is a good, non-destructive and fast to survey the effect of Lomax, soon after spraying and before the visual symptoms appear in treated weed species.