Common beans (Phaseolus vulgaris L.) is one of the most important legumes in the world due to its adaptation to a wide range of climatic conditions, high commercial value, good production, consumer acceptance and nutritional value. However, in arid and semi-arid regions, the consequences of climate change, population growth and the expansion of industry have led to a reduction in the share of water in agriculture and an intensification of water scarcity in crop production. At the same time, the increase in the concentration of atmospheric carbon dioxide, as the most important greenhouse gas, has affected the growth of plants. Therefore, this study was conducted to study the effect of the interaction between ambient CO2 concentration and water scarcity on growth, physiological characteristics and nodulation of bean plant in soldier growth chambers located in Bagh-e-Anari farm (32 ° 42 'north, 51 ° 32' east and 1645 m altitude). Sea level) Isfahan University of Technology was implemented in the spring of 1399. Brilliant, chestnut, ruby and COS16 genotypes in three levels of soil moisture depletion (depletion of 30, 45 and 60% of usable soil moisture as a control, mild and severe dehydration, respectively) as a factorial experiment in two media with concentrations Normal (400 ± 50 μmol mol) and enriched (700 ± 50 μmol mol) carbon dioxide were eva‎luated in three replications. All seeds were inoculated with Rhizobium isolates of Derakhshan cultivar before sowing and twice with irrigation water. The results showed that due to the increase in carbon dioxide concentration, shoot dry weight increased at all levels of irrigation and the rate of increase in control and mild and severe stress treatments was 34%, 40% and 25%, respectively. Due to the increase in carbon dioxide concentration, root dry weight in control conditions increased significantly in all cultivars except Derakhshan cultivar. Also, under mild stress in COS16 and Derakhshan cultivars, a significant increase in root dry weight was observed, while in severe stress Sadri cultivar Showed a significant decrease and in COS16 and Derakhshan cultivars a significant increase in root dry weight was observed. Due to increasing the concentration of carbon dioxide, the grain weight of COS16, Derakhshan and Yaghoot cultivars increased by 40%, 51% and 49%, respectively, and no significant change was observed in Sadri cultivar. Increasing the concentration of carbon dioxide increased the average number of root nodules of the studied bean cultivars by 57%, which was a significant increase in chestnut and ruby cultivars. Due to increasing the concentration of carbon dioxide, the efficiency of irrigation water consumption increased at all levels of irrigation and the rate of increase in mild and severe stress treatments was 55, 38 and 22%, respectively. With increasing the concentration of carbon dioxide, the grain protein percentage of bean cultivars decreased at all irrigation levels and the rate of reduction in control, mild and severe stress treatments were 3.7, 4.8 and 7%, respectively. The results of PCA bioplate for normal environment (normal concentration of carbon dioxide and control irrigation conditions) showed that there was a strong correlation between irrigation water use efficiency, chlorophyll b, leaf area, shoot dry weight, and maximum quantum efficiency. These traits were also negatively correlated with proline, soluble sugar and guaiacol peroxidase. Under severe stress at normal carbon dioxide concentrations, chlorophyll a and b showed a negative correlation, while in carbon dioxide enriched conditions,

حميدرضا عشقي‌زاده ،محمدحسين اهتمام

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