title: [Effects of NO3- stress on cucumber seedling growth and magnesium absorbing under suboptimal temperature].
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 °C/12 °C (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.
authors.forename: Quan-yong
authors.initials: QY
authors.lastname: Yang
authors.forename: Xiu-feng
authors.initials: XF
authors.lastname: Wang
authors.forename: Yu-rui
authors.initials: YR
authors.lastname: Han
authors.forename: Jing-jing
authors.initials: JJ
authors.lastname: Yang
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.forename: Feng-juan
authors.initials: FJ
authors.lastname: Yang
authors.forename: Qing-hua
authors.initials: QH
authors.lastname: Shi
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
mesh_terms: D002118:Calcium / Q000378:metabolism; D018553:Cucumis sativus / Q000254:growth & development*; D008274:Magnesium / Q000378:metabolism*; D009566:Nitrates / Q000737:chemistry*; D010788:Photosynthesis; D011188:Potassium / Q000378:metabolism; D036226:Seedlings / Q000254:growth & development; D013312:Stress, Physiological; D013696:Temperature
chemical_list: D009566:Nitrates; D008274:Magnesium; D011188:Potassium; D002118:Calcium