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Agronomy 2018, 8(5), 66; https://doi.org/10.3390/agronomy8050066

Alleviation of Drought Stress by Nitrogen Application in Brassica campestris ssp. Chinensis L.

School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
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Received: 2 April 2018 / Revised: 26 April 2018 / Accepted: 2 May 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Biotic and Abiotic Stress Responses in Crop Plants)
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Abstract

To assess the influence of drought stress on the growth and nitrogen nutrition status of pakchoi (Brassica campestris ssp. Chinensis L.) at different nitrogen (N) levels, the changes in N accumulation and enzyme activities involved in N assimilation were investigated. The drought was induced by adding polyethylene glycol (PEG) under hydroponic culture conditions. Pakchoi seedlings were exposed to a modified nutrient solution with different nitrogen concentration (N1, N2, and N3 represent 2, 9 and 18 mM NaNO3, respectively) and osmotic potential (W1, W2 and W3 represent 0, 60 and 120 g·L−1 PEG 6000) in a full factorial, replicated randomized block design. A short time (seven days) of drought stress caused a significant decline in plant water content, transpiration rate, shoot biomass and shoot nitrogen concentration. Increasing N availability considerably alleviate drought stress by increasing the content of total free amino acids in the roots, promoting the acceleration of root biomass accumulation, and improving the activities of nitrate reductase (NR; EC 1.7.1.1) and glutamine synthetase (GS; EC 6.3.1.2) which would reduce moisture limitations. The results suggested that pakchoi supplied with relative higher N had better growth performance under drought stress. View Full-Text
Keywords: pakchoi; drought stress; nitrogen concentration; enzyme activities; leafy vegetable pakchoi; drought stress; nitrogen concentration; enzyme activities; leafy vegetable
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Xiong, X.; Chang, L.; Khalid, M.; Zhang, J.; Huang, D. Alleviation of Drought Stress by Nitrogen Application in Brassica campestris ssp. Chinensis L.. Agronomy 2018, 8, 66.

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