RNA-Seq reveals a xenobiotic stress response in the soybean aphid, Aphis glycines, when fed aphid-resistant soybean
Issue Date:
2014Metadata
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BioMed CentralCitation:
Raman Bansal, MAR Mian, Omprakash Mittapalli, and Andy P Michel. "RNA-Seq reveals a xenobiotic stress response in the soybean aphid, Aphis glycines, when fed aphid-resistant soybean." BMC Genomics 2014, 15:972. doi:10.1186/1471-2164-15-972Abstract:
Background: While much recent research has expanded our understanding of the molecular interactions between
aphids and their host plants, it is lacking for the soybean aphid, Aphis glycines. Since its North American invasion,
A. glycines has become one of the most damaging insect pests on this important crop. Five soybean genes for host
plant resistance to A. glycines have been identified, but populations of A. glycines have already adapted to overcome
these resistance genes. Understanding the molecular interactions between resistant soybean and A. glycines can
provide clues to its adaptation mechanisms. Here, we used RNA-Sequencing to compare and contrast A. glycines gene
expression when fed resistant (Rag1) and susceptible soybean.
Results: Combining results from a previous A. glycines transcriptome, we generated 64,860 high quality transcripts,
totaling 41,151,086 bases. Statistical analysis revealed 914 genes with significant differential expression. Most genes with
higher expression in A. glycines on resistant plants (N = 352) were related to stress and detoxification such as cytochrome
P450s, glutathione-S-transferases, carboxyesterases, and ABC transporters. A total of 562 genes showed lower transcript
abundance in A. glycines on resistant plants. From our extensive transcriptome data, we also identified genes encoding for
putative salivary effector proteins (N = 73). Among these, 6 effector genes have lower transcript abundance in A. glycines
feeding on resistant soybean.
Conclusions: Overall, A. glycines exhibited a pattern typical of xenobiotic challenge, thereby validating antibiosis in Rag1,
presumably mediated through toxic secondary metabolites. Additionally, this study identified many A. glycines genes and
gene families at the forefront of its molecular interaction with soybean. Further investigation of these genes in other
biotypes may reveal adaptation mechanisms to resistant plants.
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Partial funding for Open Access provided by The Ohio State University Open Access Fund.
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