Abstract：
:Late blight is a serious economic threat to potato crop, sometimes leading to complete crop loss. The resistance in potato to late blight can be qualitative or quantitative in nature. Qualitative resistance is not durable. Though quantitative resistance is durable, the breeding is challenging due to polygenic inheritance. Several quantitative trait loci (QTLs) have been identified, but the mechanisms of resistance are largely unknown. A nontargeted metabolomics approach was used to identify resistance-related (RR) metabolites in a resistant genotype (F06025), as compared to a susceptible (Shepody) genotype, mock- or pathogen-inoculated. The RR metabolites, which had high fold change in abundance, mainly belonged to phenylpropanoid, flavonoid, fatty acid, and alkaloid chemical groups. The most important phenylpropanoids identified were hydroxycinnamic acid amides, the polyaromatic domain of suberin that is known to be associated with cell wall reinforcement. These metabolites were mapped on to the potato metabolic pathways, and the candidate enzymes and their coding genes were identified. A quantitative reverse transcription polymerase chain reaction (qRT-PCR) assay revealed a higher upregulation of 4-coumarate: CoA ligase (4-CL), tyrosine decarboxylase (TyDC), and tyramine hydroxycinnamoyl transferase (THT) in the pathogen-inoculated resistant genotype than in susceptible. These genes were sequenced in both resistant and susceptible genotypes, and nonsynonymous single-nucleotide polymorphisms (nsSNPs) were found. The application of these genes in potato resistance improvement, following validation, is discussed.
journal_name
Funct Integr Genomicsjournal_title
Functional & integrative genomicsauthors
Yogendra KN,Pushpa D,Mosa KA,Kushalappa AC,Murphy A,Mosquera Tdoi
10.1007/s10142-013-0358-8subject
Has Abstractpub_date
2014-06-01 00:00:00pages
285-98issue
2eissn
1438-793Xissn
1438-7948journal_volume
14pub_type
杂志文章abstract：:A cDNA library containing approximately 5,000 clones from germinating barley embryos was constructed and used to examine the variation in gene expression patterns during the first 4 days postimbibition. The expression profiles of embryos (including scutellum) from 4 to 96 h postimbibition were compared to a reference ...
journal_title：Functional & integrative genomics
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