Profiling Diuraphis noxia (Hemiptera: Aphididae) Transcript Expression of the Biotypes SA1 and SAM Feeding on Various Triticum aestivum Varieties.
The intimate relationship between an aphid and its host is mediated by the composition of the secreted saliva. In the present study, aphid heads were sampled and transcript profiling conducted after aphids were fed on their preference host and transferred to a variety of preference and nonpreference hosts. It was found that the virulent Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae) biotype SAM was able to selectively up-regulate more transcripts when confronted with feeding on a variety of hosts, than was the case with the less virulent D. noxia biotype SA1, suggesting increased genomic regulation when coping with a stressful environment. Collectively, the observed transcriptomic changes are supported by previous findings that host changes induce significant changes in the proteome of phytophagous hemipterans, unlike in many other entomophagous generalist species. The current data suggest that highly specialized hemipterans may be able to counter plant defenses with inducible salivary transcripts with resulting protein biosynthesis, as demonstrated here.
Genetics Department, Stellenbosch University, Private Bag X1, Matieland 7601, South Africa ( nfvburger@sun.ac.za ; ambo@sun.ac.za ).|Genetics Department, University of Pretoria, Hillcrest, Pretoria, South Africa.
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Burger
Department of Botany and Plant Biotechnology, University of Johannesburg, Auckland Park, Johannesburg, South Africa (eduardv@uj.ac.za).
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Venter
Genetics Department, Stellenbosch University, Private Bag X1, Matieland 7601, South Africa (nfvburger@sun.ac.za; ambo@sun.ac.za).
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Botha
D054458:Amplified Fragment Length Polymorphism Analysis; D000818:Animals; D000898:Antibiosis; D001042:Aphids / Q000235:genetics* / Q000502:physiology; D018076:DNA, Complementary / Q000235:genetics; D060146:Ecotype; D060434:Herbivory; D059467:Transcriptome; D014908:Triticum / Q000254:growth & development / Q000502:physiology*
D018076:DNA, Complementary
Diuraphis noxia; Russian wheat aphid; cDNA-AFLP; plant–insect interaction; salivary expression profile