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- W2972804986 abstract "Abstract Stomatal movement, which regulates gas exchange in plants, is controlled by a variety of environmental factors, including biotic and abiotic stresses. The stress hormone ABA initiates a signaling cascade, which leads to increased H 2 O 2 and Ca 2+ levels and F-actin reorganization, but the mechanism of, and connection between, these events is unclear. SINE1, an outer nuclear envelope component of a plant Linker of Nucleoskeleton and Cytoskeleton (LINC) complex, associates with F-actin and is, along with its paralog SINE2, expressed in guard cells. Here, we have determined that Arabidopsis SINE1 and SINE2 play an important role in stomatal regulation. We show that SINE1 and SINE2 are required for stomatal opening and closing. Loss of SINE1 or SINE2 results in ABA hyposensitivity and impaired stomatal dynamics but does not affect stomatal closure induced by the bacterial elicitor flg22. The ABA-induced stomatal closure phenotype is, in part, attributed to impairments in Ca 2+ and F-actin regulation. Together, the data suggest that SINE1 and SINE2 act downstream of ABA but upstream of Ca 2+ and F-actin. While there is a large degree of functional overlap between the two proteins, there are also critical differences. Our study makes an unanticipated connection between stomatal regulation and a novel class of nuclear envelope proteins, and adds two new players to the increasingly complex system of guard cell regulation." @default.
- W2972804986 created "2019-09-19" @default.
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- W2972804986 date "2019-09-12" @default.
- W2972804986 modified "2023-10-12" @default.
- W2972804986 title "Establishing the role of SINE proteins in regulating stomatal dynamics in Arabidopsis thaliana" @default.
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- W2972804986 doi "https://doi.org/10.1101/759712" @default.
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