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- W2115507110 abstract "Lipoxygenase (LOX), a non-haem-iron-containing dioxygenase, is activated under various biotic or abiotic stresses to trigger a series resistance response, but the molecular mechanism of LOX activation remains unclear. This work investigated the activation of LOX during the plant defence response induced by excess red light (RL). In conditions of RL-induced defence, Arabidopsis LOX activity and transcription levels of LOX2, LOX3, and LOX4 were both upregulated. Under RL, phytochrome B promoted the degradation of phytochrome-interacting factor 3 (PIF3), a factor that inhibited the expression levels of LOXs, and thus the transcription levels of LOX2, LOX3, and LOX4 were increased. Upon pathogen infection, the activity of mitogen-activated protein kinase 3 (MPK3) and MPK6 was increased in plants pre-treated with RL. Moreover, experiments with the inhibitor PD98059 and mutants mpk3 and mpk6-2 demonstrated that MPK3 and MPK6 were both responsible for LOX activation. Further results showed that, in response to RL, an increase in cytoplasmic calcium concentration and upregulation of calmodulin 3 (CaM3) transcript level occurred upstream of MPK3 and MPK6 activation. Collectively, these results suggested that activation of LOX both at the transcript level and in terms of activity modulates the defence response induced by RL, providing a new insight into the mechanistic study of LOX during plant defences." @default.
- W2115507110 created "2016-06-24" @default.
- W2115507110 creator A5006513559 @default.
- W2115507110 creator A5033187985 @default.
- W2115507110 creator A5091784280 @default.
- W2115507110 date "2014-06-10" @default.
- W2115507110 modified "2023-10-12" @default.
- W2115507110 title "Phytochrome B-mediated activation of lipoxygenase modulates an excess red light-induced defence response in Arabidopsis" @default.
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- W2115507110 doi "https://doi.org/10.1093/jxb/eru247" @default.
- W2115507110 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4144769" @default.
- W2115507110 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24916071" @default.
- W2115507110 hasPublicationYear "2014" @default.
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