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- W2356813426 abstract "The crucial role played by nitrate reductase(NR) in Arabidopsis plants in response to sulfur dioxide(SO2) was investigated. The present results showed that NR activity in four-week-old Arabidopsis plants increased gradually during 72 h of SO2 exposure. Meanwhile nitric oxide(NO) level in leaf guard cells increased in a time-dependent manner during 24 h of SO2 exposure. The NR activity and NO levels showed a positive correlation in Arabdopsis plants in response to SO2 stress. The increase of NO level induced by SO2 was efficiently blocked by nitrate reductase inhibitor sodium azide. The results of RT-PCR analysis showed that Nia1,Nia2 and NiR1 genes,which encode the key components of the nitrate reductase pathway,were all upregulated in Arabidopsis shoots after Arabidopsis plants fumigated with 30 mg·m- 3SO2 for 72 h. These results demonstrated an enhanced nitrate reductasedependent NO synthesis in response to SO2 stress. By studying stomatal movements,which are well recognized as a model system for studies on cellular signal transduction pathway,we provided clear evidences for the involvement of nitrate reductase-dependent NO production in stomatal movement regulation upon SO2 exposure. Our results showed that SO2 exposure caused stomatal closure in Arabidopsis wildtype,nia2 and nia1nia2 mutants,however NO scavenger c-PTIO and nitrate reductase inhibitor NaN 3 blocked SO2-induced stomatal closure in wildtype and nia2 mutant,but can not block SO2-induced stomatal closure in nia1nia2 mutant. Our results suggested that SO2 exposure could cause Nia1,Nia2 and NiR1 gene expression,leading to the activation of nitrate reductase pathway in Arabidopsis plants. The enhancement of nitrate reductase pathway generated more NO molecule in plant cells, and then NO was involved in the regulation of stomatal movement in order to protect plants from SO2 damage." @default.
- W2356813426 created "2016-06-24" @default.
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- W2356813426 date "2014-01-01" @default.
- W2356813426 modified "2023-09-26" @default.
- W2356813426 title "Stomatal movement regulation by nitrate reductase-dependent nitric oxide production in Arabidopsis response to sulfur dioxide" @default.
- W2356813426 hasPublicationYear "2014" @default.
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