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. 2009 Nov;151(3):1433–1445. doi: 10.1104/pp.109.144766

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Copyright © 2009, American Society of Plant Biologists

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Figure 8. — A model for NPX1 modulation of ABA signaling. NPX1 does not contain a classical DNA BD and does not exhibit transcriptional activity. NPX1 functions as a transcriptional regulator by interacting with factors such as TIP. This NPX1-TIP complex negatively regulates the expression of genes coding for ABA-dependent stress-responsive signaling and ABA-induced stomatal closing. The reduced expression of these genes may contribute to the reduced ABA sensitivity and faster water loss in the NPX1-ox plants. In addition, drought and low-potassium stresses induce ABA biosynthesis, and the increased ABA further stimulates the expression of some of the biosynthesis genes through positive feedback regulation. NPX1 may also regulate this feedback loop, thereby leading to increased ABA accumulation in NPX1-ox plants. WT, Wild type.