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Bv pAPX is a full-length cDNA-encoding peroxisomal ascorbate peroxidase isolated from leaves of salt-stressed beet ( Beta vulgaris ) plants. A high level of identity has been reported between the deduced amino acid sequence of Bv pAPX and other known ascorbate peroxidases. The genomic sequence of Bv pAPX revealed a gene composed of 5 exons and 4 introns. Several sequence motifs revealed in the 5'UTR region of the gene confer to Bv pAPX a putative responsiveness to various abiotic stresses. We determined the effect of salt stress on Bv pAPX expression in leaves of the cultivated beet varieties, Huzar and Janosik , and their wild salt-tolerant relative B. vulgaris ssp. maritima . Plants were subjected to salt stress during a 32-day culture period (long-term salt treatment). An alternative salinization protocol consisted of an 18-h incubation of detached beet leaves in media supplemented with toxic salt concentrations (short-term salt treatment). RT-Q-PCR analysis revealed that Bv pAPX expression markedly increased in leaves of plants subjected to conditions of long-term treatment with salinity, whereas Bv pAPX transcript levels remained unaffected in detached leaves during short-term salt treatment. In addition, several leaf redox system parameters, such as ascorbate peroxidase activity or ascorbic acid, hydrogen peroxide, and lipid hydroperoxide concentration, were determined in the leaves of beet plants subjected to salt stress conditions.

Cloning and Expression Analysis of a Gene Encoding for Ascorbate Peroxidase and Responsive to Salt Stress in Beet (Beta vulgaris)