Abstract：Ascorbate peroxidase (APX) is one of the important enzymes which can remove the reactive oxygen species (ROS) in the plant. In this study, APX activity in sugarcane (Saccharum officinarum) smut resistant variety (Yacheng05-179) was significantly higher (P＜0.05) than that in the susceptible one (Liucheng03-182) after inoculated with Sporisorium scitamineum within 48 h. ScAPX (GenBank accession No. KJ7565501) was separated from sugarcane with cloning and RT-PCR technologies. The bioinformatic analysis showed that the total length of ScAPX gene was 1 171 bp, which contained a complete open reading frame (1 038 bp) and encoded 345 amino acids. The ScAPX contained no signal peptide and belonged to nonsecretory protein which was likely located in the matrix of mitochondrial (91.1%) and chloroplast (88.7%). The results of tissue specificity analysis showed that the highest expression level of ScAPX was in stem skin which was 19.7 times of that in leaves. The transcript of ScAPX increased under the stresses of salicylic acid (SA), methyl jasmonate (MeJA), hydrogen peroxide (H2O2), abscisic acid (ABA), sodium chloride (NaCl) and polyethylene glycol (PEG). The peak of the ScAPX transcript under the stresses of SA, MeJA and H2O2 was accumulated during the initial period, which was earlierly found than that under ABA, NaCl and PEG stresses, and then it declined gradually. The expression pattern of ScAPX in response to ABA, NaCl and PEG treatments was not clear after 24 h, while the transcripts were kept in the peak at 24 h. Though the gene expression under the exogenous stresses were different, it was undoubted that ScAPX was positive response to the external stress. This study provides the basis for further functional analysis and application of this gene in the future.
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