文献类型： 外文期刊

作者： Wang, D. H. ¹ ; Li, X. X. ¹ ; Su, Z. K. ¹ ; Ren, H. X. ¹ ;

作者机构： 1.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China

2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Hainan 571737, Peoples R China

3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

关键词： lipid peroxidation

期刊名称：BIOLOGIA PLANTARUM （ 影响因子：1.747； 五年影响因子：2.146 ）

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收录情况： SCI

摘要： Two rice (Oryza sativa L.) cultivars differing in chilling sensitivity, Changbaijiu (chilling-tolerant) and Zhongjian (chilling-sensitive) were pre-treated with 0.5, 1.0 and 2.0 mM salicylic acid (SA) for 24 h before chilling at 5A degrees C for 1 d. Chilling induced SA accumulation, particularly conjugated SA in both leaves and roots of the two rice cultivars. After SA administration, SA accumulated in the roots of both cultivars at a concentration-dependent manner, whereas only a slight increase was observed in their leaves. Conjugated SA accounted for most of the increase. The beneficial effect of SA treatment on protecting rice seedlings from chilling injury was not observed at any concentration in either cultivar. Pre-treatment with SA even decreased their chilling tolerance confirmed by increased electrolyte leakage and lipid peroxidation. Further, most of the activities of antioxidant enzymes decreased or remained unchanged in leaves and roots of SA pre-treated seedlings after chilling. These results implied that down-regulation of antioxidant defence might be involved in the reduction of chilling tolerance in SA-pre-treated plants.