| Effect of drought stress and potassium on biomass and water use of Brassica napus cultivars during seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2019.06.09 |
| Key Words: Brassica napus drought stress potassium fertilizer biomass water use efficiency transpiration efficiency potassium use efficiency drought tolerance |
| Author Name | Affiliation | | ZHU Bo | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China | | XU Qiwen | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China | | MA Shumin | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China | | ZHANG Xiaoduan | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China | | XING Yi | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China | | WANG Longchang | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco\|environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education， Chongqing 400716, China |
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| Abstract: |
| A pot experiment was conducted to determine the effect of different water and potassium on biomass and water use characteristics on eight rapeseed cultivars. Compared with normal water supply (W2), drought stress (W1)severely hampered the growth and biomass by 43.7% and 36.3%, respectively,at drought stress and recovery stage. Biomass increased by 16.1% and 11.9% with high potassium treatment compared with those of low potassium level at drought stress and recovery stage, respectively. Water use efficiency of W1 decreased by 8.0% and 17.8% compared with those of W2 at drought and recovery stage, respectively. Compared with those of low potassium treatment, water use efficiency increased by 14.3% and 6.4% with increased potassium supply at drought stress and recovery stage, respectively. Water use efficiency was significantly relative to transpiration efficiency and was negatively correlated with ratio of evaporation to transpiration. Transpiration efficiency significantly increased under drought stress. However, evapotranspiration significantly reduced under drought stress, and transpiration of W1 decreased by 60.9% and 35.3% at drought stress and recovery stage,respectively. The ratio of evaporation to transpiration increased greatly, indicating increased fraction of water lost by evaporation rather by plant use, and this lead to the decrease of water use efficiency.The principal component analysis showed that two components could be extracted from the physiological characteristics of W1 treatment.Youyan10, Youyan57, and Youyan817 had greater total score and showed higher dry mass, water use efficiency, potassium use efficiency, and potassium absorption than other cultivars under drought stress, and were identified as drought tolerant cultivars. |
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