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Bulletin of Botanical Research ›› 2010, Vol. 30 ›› Issue (6): 674-679.doi: 10.7525/j.issn.1673-5102.2010.06.009

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Effects of La(NO3)3 on Plant Growth and Leaf Photosynthetic Physiology of Ryegrass(Lolium pernne L.) Seedlings under Alkaline Stress

LIU Jian-Xin;WANG Xin;HU Hao-Bin;WANG Rui-Juan;LI Dong-Bo   

  1. 1.Department of Life Science,Longdong University,Qingyang 745000;2.College of Chemistry & Chemical Engineering,Longdong University,Qingyang 745000
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-11-20 Published:2010-11-20
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Abstract: Effects of different concentrations of La(NO3)3 on growth of ryegrass seedlings and regulatory effect on photosynthetic physiological response in ryegrass leaves under 150 mmol·L-1 NaHCO3 stress were investigated. The ryegrass leaves were sprayed by low concentration(0.05 mmol·L-1) of La(NO3)3 solution for 3 days before NaHCO3 stress. The results showed that La(NO3)3 pretreatment significantly alleviated the decreases of the fresh and dry weights of ryegrass seedlings, the leaf chlorophyll and carotene contents, the activities of Hill reaction, electron transport, photophosphorylation, Mg2+ATPase and RuBPCase in chloroplast, and photosynthetic rate by alkaline stress, but no effect on glycolic acid oxidase activity was observed. However, pretreatment of La(NO3)3 with high concentration(0.5 mmol·L-1) had no alleviation effect on alkaline stress, instead, aggravated the injury by alkaline stress on ryegrass seedlings. These results suggested that the pretreatment of feasible concentration of La(NO3)3 could alleviate the inhibitory effect on the growth of ryegrass seedlings by alkaline stress via improving leaf photosynthetic function.

Key words: La(NO3)3, alkaline stress, ryegrass, seedling growth, photosynthetic physiology

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