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Physiological traits of wheat in drought stress conditions
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Hossein Mahmoudi   , Ahmad Afkari * |
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Abstract: (1892 Views) |
| Drought stress is one of the most important factors limiting the growth and development of crops. This experiment was conducted using a split-plot arrangement in randomized complete block design with 3 replications in research field of Islamic Azad University of Kaleibar, Iran in crop year 2017. In this experiment, the effect of three levels of drought stress after 60, 90 and 120 mm evaporation from Class A evaporation pan in the main plots and three levels of zero, 75 and 150 kg.ha-1 in sub-plots on the physiological characteristics in wheat (Triticum aestivum cv.Mihan) the comparison was made. The results of analysis of variance showed that the interaction of drought stress and superabsorbent on stomatal conductanc, cell membrane stability, proline and leaf chlorophyll index was significant. The results of comparison the mean interaction between drought stress and superabsorbent showed that the maximum chlorophyll index 6.70%, stomatal conductance 7.45 molCo2.m-2.s-1 and cell nomadic stability 48.25% was evaporated by 75 kg / ha treatment of superabsorbent application at drought in 60 mm evaporation, respectively. Comparison of the average treatment showed that the highest transpiration rate 6.10 μmol H2O. m-2.s-1, photosynthesis rate 28.23 molCo2.m-2.s-1, maximum photochemical efficiency of PSII .894 and leaf internal Co2 556.02 molCo2.m-2.s-1 was related to treatment 60 mm evaporation and the highest amount of soluble carbohoids 121.31 μg glucose.g fw was related to treatment 120 mm evaporation. The use of superabsorbents significantly increased physiological traits such as relative water content, photosynthesis rate, stomatal conductance, transpiration rate, maximal photochemical efficiency of photosystem II, and chlorophyll index. Therefore, irrigation of 60 mm evaporation and consumption of 75 kg.ha-1 of superabsorbent as the best treatment is recommended to achieve the maximum amount of wheat physiological traits. |
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| Keywords: Transpiration, Drought, Photosynthesis rate and Chlorophyll fluorescence. |
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Full-Text [PDF 1670 kb]
(2010 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2020/06/1 | Accepted: 2020/06/1 | Published: 2020/06/1
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