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2. Erratum to: Genomic innovations, transcriptional plasticity and gene loss underlying the evolution and divergence of two highly polyphagous and invasive Helicoverpa pest species

Author

Pearce, S.L., Clarke, D.F., East, P.D., Elfekih, S., Gordon, K.H.J., Jermiin, L.S., McGaughran, A., Oakeshott, J.G., Papanicolaou, A., Perera, O.P., Rane, R.V., Richards, S., Tay, W.T., Walsh, T.K., Anderson, A., Anderson, C.J., Asgari, S., Board, P.G., Bretschneider, A., Campbell, P.M., Chertemps, T., Christeller, J.T., Coppin, C.W., Downes, S.J., Duan, G., Farnsworth, C.A., Good, R.T., Han, L.B., Han, Y.C., Hatje, K., Horne, I., Huang, Y.P., Hughes, D.S.T., Jacquin-Joly, E., James, W., Jhangiani, S., Kollmar, M., Kuwar, S.S., Li, S., Liu, N-Y., Maibeche, M.T., Miller, J.R., Montagne, N., Perry, T., Qu, J., Song, S.V., Sutton, G.G., Vogel, H., Walenz, B.P., Xu, W., Zhang, H-J., Zou, Z., Batterham, P., Edwards, O.R., Feyereisen, R., Gibbs, R.A., Heckel, D.G., McGrath, A., Robin, C., Scherer, S.E., Worley, K.C., Wu, Y.D., Pearce, S.L., Clarke, D.F., East, P.D., Elfekih, S., Gordon, K.H.J., Jermiin, L.S., McGaughran, A., Oakeshott, J.G., Papanicolaou, A., Perera, O.P., Rane, R.V., Richards, S., Tay, W.T., Walsh, T.K., Anderson, A., Anderson, C.J., Asgari, S., Board, P.G., Bretschneider, A., Campbell, P.M., Chertemps, T., Christeller, J.T., Coppin, C.W., Downes, S.J., Duan, G., Farnsworth, C.A., Good, R.T., Han, L.B., Han, Y.C., Hatje, K., Horne, I., Huang, Y.P., Hughes, D.S.T., Jacquin-Joly, E., James, W., Jhangiani, S., Kollmar, M., Kuwar, S.S., Li, S., Liu, N-Y., Maibeche, M.T., Miller, J.R., Montagne, N., Perry, T., Qu, J., Song, S.V., Sutton, G.G., Vogel, H., Walenz, B.P., Xu, W., Zhang, H-J., Zou, Z., Batterham, P., Edwards, O.R., Feyereisen, R., Gibbs, R.A., Heckel, D.G., McGrath, A., Robin, C., Scherer, S.E., Worley, K.C., and Wu, Y.D.

Published
2017

3. Genomic innovations, transcriptional plasticity and gene loss underlying the evolution and divergence of two highly polyphagous and invasive Helicoverpa pest species

Author

Pearce, S.L., Clarke, D.F., East, P.D., Elfekih, S., Gordon, K.H.J., Jermiin, L.S., McGaughran, A., Oakeshott, J.G., Papanikolaou, A., Perera, O.P., Rane, R.V., Richards, S., Tay, W.T., Walsh, T.K., Anderson, A., Anderson, C.J., Asgari, S., Board, P.G., Bretschneider, A., Campbell, P.M., Chertemps, T., Christeller, J.T., Coppin, C.W., Downes, S.J., Duan, G., Farnsworth, C.A., Good, R.T., Han, L.B., Han, Y.C., Hatje, K., Horne, I., Huang, Y.P, Hughes, D.S.T., Jacquin-Joly, E., James, W., Jhangiani, S., Kollmar, M., Kuwar, S.S., Li, S., Liu, N-Y., Maibeche, M.T., Miller, J.R., Montagne, N., Perry, T., Qu, J., Song, S.V., Sutton, G.G., Vogel, H., Walenz, B P., Xu, W., Zhang, H-J., Zou, Z., Batterham, P., Edwards, O.R., Feyereisen, R., Gibbs, R.A., Heckel, D.G., McGrath, A., Robin, C., Scherer, S.E., Worley, K.C., Wu, Y.D., Pearce, S.L., Clarke, D.F., East, P.D., Elfekih, S., Gordon, K.H.J., Jermiin, L.S., McGaughran, A., Oakeshott, J.G., Papanikolaou, A., Perera, O.P., Rane, R.V., Richards, S., Tay, W.T., Walsh, T.K., Anderson, A., Anderson, C.J., Asgari, S., Board, P.G., Bretschneider, A., Campbell, P.M., Chertemps, T., Christeller, J.T., Coppin, C.W., Downes, S.J., Duan, G., Farnsworth, C.A., Good, R.T., Han, L.B., Han, Y.C., Hatje, K., Horne, I., Huang, Y.P, Hughes, D.S.T., Jacquin-Joly, E., James, W., Jhangiani, S., Kollmar, M., Kuwar, S.S., Li, S., Liu, N-Y., Maibeche, M.T., Miller, J.R., Montagne, N., Perry, T., Qu, J., Song, S.V., Sutton, G.G., Vogel, H., Walenz, B P., Xu, W., Zhang, H-J., Zou, Z., Batterham, P., Edwards, O.R., Feyereisen, R., Gibbs, R.A., Heckel, D.G., McGrath, A., Robin, C., Scherer, S.E., Worley, K.C., and Wu, Y.D.

Abstract

Background: Helicoverpa armigera and Helicoverpa zea are major caterpillar pests of Old and New World agriculture, respectively. Both, particularly H. armigera, are extremely polyphagous, and H. armigera has developed resistance to many insecticides. Here we use comparative genomics, transcriptomics and resequencing to elucidate the genetic basis for their properties as pests. Results: We find that, prior to their divergence about 1.5 Mya, the H. armigera/H. zea lineage had accumulated up to more than 100 more members of specific detoxification and digestion gene families and more than 100 extra gustatory receptor genes, compared to other lepidopterans with narrower host ranges. The two genomes remain very similar in gene content and order, but H. armigera is more polymorphic overall, and H. zea has lost several detoxification genes, as well as about 50 gustatory receptor genes. It also lacks certain genes and alleles conferring insecticide resistance found in H. armigera. Non-synonymous sites in the expanded gene families above are rapidly diverging, both between paralogues and between orthologues in the two species. Whole genome transcriptomic analyses of H. armigera larvae show widely divergent responses to different host plants, including responses among many of the duplicated detoxification and digestion genes. Conclusions: The extreme polyphagy of the two heliothines is associated with extensive amplification and neofunctionalisation of genes involved in host finding and use, coupled with versatile transcriptional responses on different hosts. H. armigera's invasion of the Americas in recent years means that hybridisation could generate populations that are both locally adapted and insecticide resistant.

Published
2017

4. Population differentiation between Australian and Chinese Helicoverpa armigera occurs in distinct blocks on the Z-chromosome.

Author

Song, S.V., Anderson, C., Good, R.T., Leslie, S., Wu, Y., Oakeshott, J.G., and Robin, C.

Subjects
*HELICOVERPA armigera, *NUCLEOTIDE sequencing, *NUCLEOTIDE sequence, *PLANT genomes, *CULTIVARS
Abstract

Over the last 40 years, many types of population genetic markers have been used to assess the population structure of the pest moth species Helicoverpa armigera. While this species is highly vagile, there is evidence of inter-continental population structure. Here, we examine Z-chromosome molecular markers within and between Chinese and Australian populations. Using 1352 polymorphic sites from 40 Z-linked loci, we compared two Chinese populations of moths separated by 700 km and found virtually no population structure (n = 41 and n = 54, with <1% of variation discriminating between populations). The levels of nucleotide diversity within these populations were consistent with previous estimates from introns in Z-linked genes of Australian samples (π = 0.028 vs. 0.03). Furthermore, all loci surveyed in these Chinese populations showed a skew toward rare variants, with ten loci having a significant Tajima's D statistic, suggesting that this species could have undergone a population expansion. Eight of the 40 loci had been examined in a previous study of Australian moths, of which six revealed very little inter-continental population structure. However, the two markers associated with the Cyp303a1 locus that has previously been proposed to be a target of a selective sweep, exhibited allele structuring between countries. Using a separate dataset of 19 Australian and four Chinese moths, we scanned the molecular variation distributed across the entire Z-chromosome and found distinct blocks of differentiation that include the region containing Cyp303a1. We recommend some of these loci join those associated with insecticide resistance to form a set of genes best suited to analyzing population structure in this global pest. [ABSTRACT FROM AUTHOR]

Published
2018
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