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. 2010 Dec 17;22(12):4128–4141. doi: 10.1105/tpc.110.078691

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© 2010 American Society of Plant Biologists

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Figure 7. — Model of GTL1 Function as a Determinant of WUE by Regulating Stomatal Density through Transrepression of SDD1.

GTL1 binds to the GT element (GT3 box: GGTAAA) in the SDD1 promoter to transrepress SDD1, which is a negative regulator of stomatal development. GTL1 negatively regulates WUE by positively regulating stomatal density and transpiration through transrepression of SDD1. GTL1 is expressed in water-sufficient conditions to facilitate stomatal development and is downregulated under water deficit to reduce transpiration.