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Title: Drought-related secondary metabolites of barley (Hordeum vulgare L.) leaves and their metabolomic quantitative trait loci
Authors: Piasecka, Anna
Sawikowska, Aneta
Kuczyńska, Anetta
Ogrodowicz, Piotr
Mikołajczak, Krzysztof
Krystkowiak, Karolina
Gudyś, Kornelia
Guzy-Wróbelska, Justyna
Krajewski, Paweł
Kachlicki, Piotr
Keywords: secondary metabolites; Hordeum vulgare; metabolomic quantitative trait loci; drought response; recombinant inbred lines
Issue Date: 2017
Citation: Plant Journal, Vol. 89, iss. 5 (2017), s. 898-913
Abstract: Determining the role of plant secondary metabolites in stress conditions is problematic due to the diversity of their structures and the complexity of their interdependence with different biological pathways. Correlation of metabolomic data with the genetic background provides essential information about the features of metabolites. LC-MS analysis of leaf metabolites from 100 barley recombinant inbred lines (RILs) revealed that 98 traits among 135 detected phenolic and terpenoid compounds significantly changed their level as a result of drought stress. Metabolites with similar patterns of change were grouped in modules, revealing differences among RILs and parental varieties at early and late stages of drought. The most significant changes in stress were observed for ferulic and sinapic acid derivatives as well as acylated glycosides of flavones. The tendency to accumulate methylated compounds was a major phenomenon in this set of samples. In addition, the polyamine derivatives hordatines as well as terpenoid blumenol C derivatives were observed to be drought related. The correlation of drought-related compounds with molecular marker polymorphisms resulted in the definition of metabolomic quantitative trait loci in the genomic regions of single-nucleotide polymorphism 3101-111 and simple sequence repeat Bmag0692 with multiple linkages to metabolites. The associations pointed to genes related to the defence response and response to cold, heat and oxidative stress, but not to genes related to biosynthesis of the compounds. We postulate that the significant metabolites have a role as antioxidants, regulators of gene expression and modulators of protein function in barley during drought.
DOI: 10.1111/tpj.13430
ISSN: 0960-7412
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