Ontology type: schema:ScholarlyArticle
2018-04-12
AUTHORSPriya Nair, Ajit K. Shasany, Feroz Khan, Ashutosh K. Shukla
ABSTRACTArtemisia annua is well-known for producing the antimalarial phytomolecule, artemisinin. The role of peroxidases has been hypothesized in artemisinin metabolism owing to the presence of an –O–O– linkage in this sesquiterpene lactone. Earlier, using a microarray, we identified differentially expressed genes, including peroxidases, in plant growth stages having contrasting artemisinin content. Here, three peroxidases—Aa547, having higher expression in low-artemisinin stage, and Aa540 and Aa528, having higher expression in high artemisinin stage, which could be associated with trichomes on the basis of their approximate gene expression pattern inferred from EST counts in UniGene—were selected for full-length cloning, tissue-specific expression profiling, and in silico analyses. The upstream genomic region of Aa547 was cloned and various cis-regulatory elements were identified. All the three candidates were predicted to be class III plant peroxidases. Further, this study aimed to check the responsiveness of the logically selected peroxidase genes to various abiotic stress factors. Taking cues from previous reports and the regulatory elements observed in the Aa547 promoter, hydration, salinity, temperature, salicylic acid, hydrogen peroxide, and methyl jasmonate, were selected to study their effect on the expression of the peroxidase genes through qRT-PCR. The peroxidases were found to be highly sensitive to the various factors but differed in their responses. Broadly, except for responses to high temperature and salicylic acid, the response of Aa547 to various factors was distinct from that of Aa540 and Aa528, which was in line with its distinctness from the other two peroxidases, considering the in planta artemisinin content and predicted structural features. More... »
PAGES295-309
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DOIhttp://dx.doi.org/10.1007/s11105-018-1078-y
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