[Effects of lanthanum on the plant growth and leaf anti-oxidative enzyme activities of cucumber seedlings under nitrate stress].
The study with water culture showed that nitrate stress had significant inhibitory effects on the plant growth, especially the shoot growth of cucumber seedlings. On the 7th day under nitrate stress, the shoot fresh mass per plant decreased by 12.77 g, leaf SOD, POD and CAT activities increased, while leaf APX, DHAR and GR activities decreased significantly, compared with the control. The addition of low concentration (0.05 mmol L(-1)) LaCl3 increased the shoot fresh mass per plant by 35%, enhanced the leaf thermally stable protein content and SOD, POD, CAT, APX, DHAR and GR activities, and decreased the leaf MDA content and electrolytic leakage, resulting in a definite alleviation of the inhibitory effects of nitrate. However, an addition of high concentration (0.5 mmol L(-1)) LaCl3 had no obvious alleviation effect. It was concluded that the addition of certain concentration LaCl3 could alleviate the nitrate stress on cucumber via increasing anti-oxidative enzymes activities and thermally stable protein content.
Gao
Qing-Hai
QH
State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai' an 271018, Shandong, China. gaoqh1977@163.com
Wang
Xiu-Feng
XF
Shi
Qing-Hua
QH
Yang
Feng-Juan
FJ
Wei
Min
M
D002374:Catalase / Q000378:metabolism; D018553:Cucumis sativus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D007811:Lanthanum / Q000494:pharmacology*; D009566:Nitrates / Q000032:analysis* / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
D009566:Nitrates; D010940:Plant Proteins; C028521:lanthanum chloride; D007811:Lanthanum; D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase