Microcystin-LR-induced phytotoxicity in rice crown root is associated with the cross-talk between auxin and nitric oxide
文献类型: 外文期刊
作者: Chen, Jian 1 ; Zhang, Hai-Qiang 1 ; Hu, Liang-Bin 4 ; Shi, Zhi-Qi 1 ;
作者机构: 1.Jiangsu Acad Agr Sci, Inst Food Qual & Safety, Nanjing 210014, Peoples R China
2.Minist Agr, Key Lab Control Technol & Stand Agroprod Safety &, Nanjing 210014, Peoples R China
3.State Key Lab Breeding Base, Key Lab Food Qual & Safety Jiangsu Prov, Nanjing 210014, Peoples R China
4.Henan Inst Sci & Technol, Sch Food Sci, Xinxiang 453003, Peoples R China
关键词: Auxin;Crown root;Microcystin-LR;Nitric oxide;Oryza sativa
期刊名称:CHEMOSPHERE ( 影响因子:7.086; 五年影响因子:6.956 )
ISSN:
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收录情况: SCI
摘要: Irrigation with cyanobacterial-blooming water containing microcystin-LR (MC-LR) poses threat to the growth of agricultural plants. Large amounts of rice (Oryza sativa) field in the middle part of China has been irrigating with cyanobacterial-blooming water. Nevertheless, the mechanism of MC-LR-induced phytotoxicity in the root of monocot rice remains unclear. In the present study, we demonstrate that MC-LR stress significantly inhibits the growth of rice root by impacting the morphogenesis rice crown root. MC-LR treatment results in the decrease in IAA (indole-3-acetic acid) concentration as well as the expression of CRL1 and W0X11 in rice roots. The application of NAA (1-naphthylacetic acid), an IAA homologue, is able to attenuate the inhibitory effect of MC-LR on rice root development. MC-LR treatment significantly inhibits OsNial-dependent NO generation in rice roots. The application of NO donor SNP (sodium nitroprusside) is able to partially reverse the inhibitory effects of MC-LR on the growth of rice root and the expression of CRL1 and W0X1I by enhancing endogenous NO level in rice roots. The application of NO scavenger cPTIO [2-(4-carboxy-2-phenyl)-4,4,5,5-tetramethylinidazoline-l-oxyl-3-oxide] eliminates the effects of SNP. Treatment with NAA stimulates the generation of endogenous NO in MC-LR-treated rice roots. Treatment with NO scavenger cPTIO abolishes the ameliorated effect of NAA on MC-LR-induced growth inhibition of rice root. Treatment with SNP enhanced IAA concentration in MC-LR-treated rice roots. Altogether, our data suggest that NO acts both downstream and upstream of auxin in regulating rice root morphogenesis under MC-LR stress.
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