Detailed Information |
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| Standard Gene Set Name | JENSEN_COL/ATAF-BGH_UP |
| Species | Arabidopsis thaliana |
| Brief Description | Up-regulated by COL vs atAF bgh (Table 2 PubmedID:18694460) |
| Full Description/Abstract | atAF1 is a member of a largely uncharacterized plant-specific gene family encoding NAC transcription factors, and is induced in response to various abiotic and biotic stimuli in Arabidopsis thaliana. Previously, we showed that a mutant allele of atAF1 compromises penetration resistance in Arabidopsis with respect to the non-host biotrophic pathogen Blumeria graminis f. sp. hordei (Bgh). In this study, we have used genome-wide transcript profiling to characterize signalling perturbations in ataf1 plants following Bgh inoculation. Comparative transcriptomic analyses identified an over-representation of abscisic acid (ABA)-responsive genes, including the ABA biosynthesis gene AAO3, which is significantly induced in ataf1 plants compared to wild-type plants following inoculation with Bgh. Additionally, we show that Bgh inoculation results in decreased endogenous ABA levels in an atAF1-dependent manner, and that the ABA biosynthetic mutant aao3 showed increased penetration resistance to Bgh compared to wild-type plants. Furthermore, we show that ataf1 plants show ABA-hyposensitive phenotypes during seedling development and germination. Our Data support a negative correlation between ABA levels and penetration resistance, and identify atAF1 as a new stimuli-dependent attenuator of ABA signalling for the mediation of efficient penetration resistance in Arabidopsis upon Bgh attack |
| External Pathway ID/Pubmed ID | 18694460 |
| Source | Literature |
| Contributor/Author | Liming Lai and Xijin Ge |
| Organization of contributer | South Dakota State University |
| External URL | NA |