Molecular characterization of two isoforms of a farnesyl pyrophosphate synthase gene in wheat and their roles in sesquiterpene synthesis and inducible defence against aphid infestation

A - Papers appearing in refereed journals

Zhang, Y., Li, Z-X., Yu, X-D., Fan, J., Pickett, J. A., Jones, H. D., Zhou, J-J., Birkett, M. A., Caulfield, J., Napier, J. A., Zhao, G-Y., Cheng, X-G., Shi, Y., Bruce, T. J. A. and Xia, L-Q. 2015. Molecular characterization of two isoforms of a farnesyl pyrophosphate synthase gene in wheat and their roles in sesquiterpene synthesis and inducible defence against aphid infestation. New Phytologist. 206 (3), pp. 1101-1115.

AuthorsZhang, Y., Li, Z-X., Yu, X-D., Fan, J., Pickett, J. A., Jones, H. D., Zhou, J-J., Birkett, M. A., Caulfield, J., Napier, J. A., Zhao, G-Y., Cheng, X-G., Shi, Y., Bruce, T. J. A. and Xia, L-Q.
Abstract

Aphids are important pests of wheat (Triticum aestivum) that affect crop production globally. Herbivore-induced emission of sesquiterpenes can repel pests, and farnesyl pyrophosphate synthase (FPS) is a key enzyme involved in sesquiterpene biosynthesis. However, fps orthologues in wheat and their functional roles in sesquiterpene synthesis and defence against aphid infestation are unknown. Here, two fps isoforms, Tafps1 and Tafps2, were identified in wheat. Quantitative real-time polymerase chain reaction (qRT-PCR) and invitro catalytic activity analyses were conducted to investigate expression patterns and activity. Heterologous expression of these isoforms in Arabidopsis thaliana, virus-induced gene silencing (VIGS) in wheat and aphid behavioural assays were performed to understand the functional roles of these two isoforms. We demonstrated that Tafps1 and Tafps2 played different roles in induced responses to aphid infestation and in sesquiterpene synthesis. Heterologous expression in A.thaliana resulted in repulsion of the peach aphid (Myzus persicae). Wheat plants with these two isoforms transiently silenced were significantly attractive to grain aphid (Sitobion avenae). Our results provide new insights into induced defence against aphid herbivory in wheat, in particular, the different roles of the two Tafps isoforms in both sesquiterpene biosynthesis and defence against aphid infestation.

KeywordsPlant Sciences
Year of Publication2015
JournalNew Phytologist
Journal citation206 (3), pp. 1101-1115
Digital Object Identifier (DOI)doi:10.1111/nph.13302
PubMed ID25644034
Open accessPublished as bronze (free) open access
FunderBiotechnology and Biological Sciences Research Council
Natural Science Foundation of China
Chinese Ministry of Agriculture
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
Wheat
PublisherWiley
Grant ID31171618
31371702
2014ZX0800201B
ISSN0028-646X