On the Significance of the ADNT1 Carrier in Arabidopsis thaliana under Waterlogging Conditions.

Among the adenylate carriers identified in , only the AMP/ATP transporter shows increased expression in roots under waterlogging stress conditions. Here, we investigated the impact of a reduced expression of in plants submitted to waterlogging conditions. For this purpose, an T-DNA mutant and two antisense lines were evaluated. Following waterlogging, deficiency resulted in a reduced maximum quantum yield of PSII electron transport (significantly for and antisense Line 10), indicating a higher impact caused by the stress in the mutants. In addition, deficient lines showed higher levels of AMP in roots under nonstress condition. This result indicates that the downregulation of impacts the levels of adenylates. -deficient plants exhibited a differential expression pattern of hypoxia-related genes with an increase in non-fermenting-related-kinase 1 () expression and upregulation of adenylate kinase () under stress and non-stress conditions. Together, these results indicated that the lower expression of is associated with an early "hypoxic status" due to the perturbation of the adenylate pool caused by reduced AMP import by mitochondria. This perturbation, which is sensed by SnRK1, results in a metabolic reprogramming associated with early induction of the fermentative pathway in deficient plants.