BnHO1, a haem oxygenase-1 gene from Brassica napus, is required for salinity and osmotic stress-induced lateral root formation

文献类型： 外文期刊

第一作者： Cao, Zeyu

作者： Cao, Zeyu;Geng, Beibei;Xu, Sheng;Xuan, Wei;Nie, Li;Shen, Wenbiao;Cao, Zeyu;Geng, Beibei;Xu, Sheng;Xuan, Wei;Nie, Li;Shen, Wenbiao;Cao, Zeyu;Shen, Wenbiao;Liang, Yongchao;Cao, Zeyu;Guan, Rongzhan

作者机构：

关键词： carbon monoxide: 630-08-0;sodium chloride: 7647-14-5;polyethylene glycol: PEG;25322-68-3;mRNA;naphthylacetic acid: 26445-01-2;haem oxygenase: 9059-22-7;EC 1.14.99.3;N-1-naphthylphthalamic acid: 132-66-1;auxin transport inhibitor;Arabidopsis HY1 protein: transit peptide;hemin: 16009-13-5;haem oxygenase-1 inhibitor;zinc protoporphyrin IX: ZnPPIX;15442-64-5;haem oxygenase-1 inhibitor;salinity;enzyme activity;osmotic stress;auxin signalling;stress-induced lateral root formation

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

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年卷期：

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收录情况： SCI

摘要： In this report, a rapeseed (Brassica napus) haem oxygenase-1 gene BnHO1 was cloned and sequenced. It shared high homology with Arabidopsis HY1 proteins, and encodes a 32.6 kDa protein with a 54-amino-acid transit peptide, predicting the mature protein of 25.1 kDa. The mature BnHO1 expressed in Escherichia coli exhibits haem oxygenase (HO) activity. Furthermore, the application of lower doses of NaCl (10 mM) and polyethylene glycol (PEG) (2%) mimicked the inducible effects of naphthylacetic acid and the HO-1 inducer haemin on the up-regulation of BnHO1 and subsequent lateral root (LR) formation. Contrasting effects were observed when a higher dose of NaCl or PEG was applied. The above inducible and inhibitory responses were blocked significantly when the HO-1 inhibitor zinc protoporphyrin IX (ZnPPIX) or haemin was applied, both of which were reversed by the application of carbon monoxide or ZnPPIX, respectively. Moreover, the addition of ZnPPIX at different time points during LR formation indicated that BnHO1 might be involved in the early stages of LR formation. The auxin response factor transcripts and the auxin content in seedling roots were clearly induced by lower doses of salinity or osmotic stress. However, treatment with the inhibitor of polar auxin transport N-1-naphthylphthalamic acid prevented the above inducible responses conferred by lower doses of NaCl and PEG, which were further rescued when the treatments were combined with haemin. Taken together, these results suggested a novel role of the rapeseed HO-1 gene in salinity and osmotic stress-induced LR formation, with a possible interaction with auxin signalling.

分类号： Q94

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