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. 2010 Sep 9;6(9):e1001098. doi: 10.1371/journal.pgen.1001098

Figure 13. A schematic diagram of the involvement of OsAP2-39 in the ABA and GA antagonism and homeostasis.

Figure 13

The OsAP2-39 controls the level of bioactive GA through two different pathways. First is an indirect pathway (presented in black continuous arrows) in which the OsAP2-39 activates the ABA biosynthesis gene (OsNCED-1) which increases the endogenous ABA level in rice. A high ABA level induces EUI expression which in turn deactivates GAs. Second is a direct pathway (presented in red continuous arrows) in which the OsAP2-39 transcription factor directly upregulates EUI. A high ABA content down regulates OsAP2-39 leading to ABA homeostasis. Both mechanisms lead to a reduction in bioactive GAs and consequently the appearance of the abnormal phenotypes seen in the OsAP2-39 overexpressing lines (OsAP2-39-OEL).