文献类型： 外文期刊
作者： ZHANG, JX 1 ; CUI, SP 1 ; LI, JM 1 ; WEI, JK 1 ; KIRKHAM, MB 1 ;
作者机构： 1.HEBEI ACAD AGR & FORESTRY SCI, INST AGROPHYS PLANT PHYSIOL & BIOCHEM, SHIJIAZHUANG 050051, PEOPLES R CHINA
关键词： Antioxidant enzymes;Chilling resistance;Protoplasmic parameters;Zea mays;Membrane-permeability;Zea-mays;Temperature;Oxygen;Plants;Injury;Superoxide;Leaves;Stress;Lines
期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）
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收录情况： SCI
摘要： The effects of chilling temperature (4 degrees C for 2 days) on activities of enzymatic antioxidant systems and protoplasmic qualities were studied in three-leaf-stage seedlings of three inbred lines of maize (Zea mays L.) with differing chilling resistance: chilling-sensitive (CS; line 881089), chilling-resistant (CR; line 882014), and intermediately sensitive to chilling (CI; line 881086). Compared to the control plants grown at 25 degrees C/15 degrees C (day/night temperatures), activities of leaf cytosolic catalase (EC 1.11.1.6), cytosolic superoxide dismutase (EC 1.15.1.1), and mitochondrial superoxide dismutase decreased or did not change in the CS and CI lines at the chilling temperature, but increased in the CR line. Activities of chloroplastic superoxide dismutase were lowered in all three lines, whereas activities of cytosolic peroxidase (EC 1.11.1.7) remained unchanged. Methylurea permeability constants (K-s) of the plasma layer in coleoptiles were increased by the chilling temperature in the CI and CR lines, but decreased in the CS line. Protoplasmic viscosities (P-v) of coleoptiles in all three lines were increased by the chilling temperature, with the increase being greatest in the CR line and least in the CS line. Solute potentials were slightly decreased in the three lines compared to their corresponding controls. Damage, as indicated by lipid peroxidation and waterlogged appearance, was apparent in the CS and CI lines, but not in the CR line. The results suggest that one of the fundamental differences between chilling-sensitive and chilling-resistant plants lies in the ability of resistant plants to reduce the damaging effects of chilling and chilling- induced production of free radicals through increased enzymatic antioxidant systems and adjusted protoplasmic qualities (K-s and P-v). The solute potential seems to be of no or only little importance for chilling resistance. [References: 40]
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