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Effects of NO3- stress on cucumber seedling growth and magnesium absorbing under suboptimal temperature.

YANG Quan-yong1, WANG Xiu-feng1,2, HAN Yu-rui1, YANG Jing-jing1, WEI Min1,2,3, YANG Feng-juan 1,2, SHI Qing-hua1,2, LI Yan1   

  1. (1College of Horticultural Science and Engineering, Shandong Agricultural University, Tai’an 271018, Shandong, China; 2State Key Laboratory of Crop Biology, Tai’an 271018, Shandong, China; 3Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in HuangHuaiHai Region, Ministry of Agriculture, Tai’an 271018, Shandong, China)
  • Online:2015-05-18 Published:2015-05-18

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Abstract: The effects of NO3- stress on the growth and the magnesium absorption of cucumber seedlings were investigated after 1 and 14 d of suboptimal temperature
 ［18 ℃/12 ℃ (day/night)］ treatment. The results indicated that the growth, net photosynthetic rate, transpiration rate, Fv/Fm and ΦPSII of cucumber seedlings were significantly inhibited by NO3- stress under suboptimal temperature. The magnesium content of cucumber seedlings was also significantly decreased compared with control treatment, especially in the Ⅳ treatment （suboptimal temperature +140 mmol·L-1 NO3-+1 mmol·L-1 Mg2+）, and the antagonistic impact of magnesium ion absorption on the absorption of potassium and calcium ion was observed. The magnesium deficiency symptom of cucumber seedlings could be partly alleviated by increasing the concentration of magnesium ion in the nutrient solution.