Abstract:
MAIN CONCLUSION:Smut pathogen induced an early modulation of the production and scavenging of reactive oxygen species during defence responses in resistant sugarcane that coincided with the developmental stages of fungal growth. Sporisorium scitamineum is the causal agent of sugarcane smut disease. In this study, we characterized sugarcane reactive oxygen species (ROS) metabolism in response to the pathogen in smut-resistant and -susceptible genotypes. Sporisorium scitamineum teliospore germination and appressorium formation coincided with H2O2 accumulation in resistant plants. The superoxide dismutase (SOD) activity was not responsive in any of the genotypes; however, a higher number of isoenzymes were detected in resistant plants. In addition, related to resistance were lipid peroxidation, a decrease in catalase (CAT), and an increase in glutathione S-transferase (GST) activities and an earlier transcript accumulation of ROS marker genes (CAT3, CATA, CATB, GST31, GSTt3, and peroxidase 5-like). Furthermore, based on proteomic data, we suggested that the source of the increased hydrogen peroxide (H2O2) may be due to a protein of the class III peroxidase, which was inhibited in the susceptible genotype. H2O2 is sensed and probably transduced through overlapping systems related to ascorbate-glutathione and thioredoxin to influence signalling pathways, as revealed by the presence of thioredoxin h-type, ascorbate peroxidase, and guanine nucleotide-binding proteins in the infected resistant plants. Altogether, our data depicted the balance of the oxidative burst and antioxidant enzyme activity in the outcome of this interaction.
journal_name
Plantajournal_title
Plantaauthors
Peters LP,Carvalho G,Vilhena MB,Creste S,Azevedo RA,Monteiro-Vitorello CBdoi
10.1007/s00425-016-2642-zsubject
Has Abstractpub_date
2017-04-01 00:00:00pages
749-764issue
4eissn
0032-0935issn
1432-2048pii
10.1007/s00425-016-2642-zjournal_volume
245pub_type
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