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Spodoptera frugiperda caterpillar © Marie FRAYSSINET

Scientists decode the genome of Fall Armyworm: a moth pest that is invading Africa

As part of an international consortium, INRA researchers, in partnership with the CEA and INRIA1, have sequenced one of the first genomes of a moth from the superfamily Noctuoidea: Spodoptera frugiperda, or armyworm. This crop pest – until now only known on the American continent – has become invasive in Africa since 2016. Published in Scientific Reports on 25 September 2017, this study opens up perspectives for new methods of biological control and a better understanding of the mechanisms involved in the appearance of pesticide resistance.

Updated on 10/18/2017
Published on 09/25/2017

Spodoptera frugiperda is a moth belonging to the superfamily Noctuoidea. It is also called Armyworm because the caterpillars are sometimes so numerous that they form “carpets” on the ground, similar to an army on the march. Unlike the majority of herbivorous insects, the Armyworm is highly polyphagous: it attacks over one hundred plant species, including crops (maize, rice, sorghum, cotton and soybean).  The moth moves in large swarms and is able to fly long distances.

 
Until now limited to America and the Caribbean, Spodoptera frugiperda is estimated to cause 600 million dollars in damage in Brazil every year according to the FAO2. In America, 67 cases of insect resistance to pesticides have been identified to date3, illustrating the difficulty of controlling these populations. Since January 2016, it has become invasive in Africa, where it destroys maize crops in 21 countries in the south and west parts of the continent. It is currently a threat to the European continent.

   Sequencing of one of the first genomes of a moth belonging to the superfamily Noctuoidea

In the framework of an international public consortium called Fall Armyworm4, INRA researchers, in partnership with the CEA and INRIA, sequenced the genome of Spodoptera frugiperda. They described one of the first genomes of a moth belonging to the superfamily Noctuoidea and, more specifically, studied three types of gene families5 in this insect.
-    Scientists first analysed a group of genes involved in the recognition of host plants which allows them to feed or lay their eggs. By comparing the genome of S. frugiperda with the available genomes of (non-polyphagous) Lepidoptera, researchers found an expansion in the number of genes (230 versus 45 to 74 in other Lepidoptera) encoding a certain type of taste receptor. The latter are located on the moth’s trump (proboscis) or under their legs. They are thought to allow them to detect toxins or bitter compounds produced by plants. The only insect known to have such taste receptor expansions is an omnivorous beetle, the red flour beetle, which also attacks a wide range of foods.
-    Researchers also looked at other families of genes necessary to cope withr the chemical defences that plants overproduce when they are attacked (detoxification). They discovered expansions in two of the four major gene families for detoxification (encoding cytochrome P450s (CYP) or glutathione-S-transferases (GST)). These are the same genes that can be involved in resistance to pesticides.
-    Lastly, scientists described a group of genes involved in the digestion of plant tissues.

For the purpose of the study, two genomes of S. frugiperda were analysed: two genomic variants based on the insect’s host plant – the maize variant and rice variant, which are found throughout their range of distribution in America.  The researchers found differences between the variants in terms of the number and sequence of genes necessary to detoxify the toxins emitted by the plants and in the genes necessary for digestion.

This data was made available to the international scientific community to allow specialists to identify which variant of the moth is invading Africa. Moreover, this work will also make it possible to envision new biological control methods. It will also improve understanding of the mechanisms by which pesticide resistance appears.

The genome of a related species in Asia also sequenced
Researchers at INRA have contributed to the analysis of the genome of Spodoptera litura, an Asian ‘cousin’ of Spodoptera frugiperda. This polyphagous pest found in Asia attacks a hundred or so crops, including rice, cotton and vegetables. The sequencing of its genome appeared the same day in Nature Ecology and Evolution (doi:10.1038/s41559-017-0314-4.).

  

1 The GensCale team at INRIA’s Rennes Bretagne-Atlantique research centre is a bioinformatics team that develops methods to process and assemble the massive amount of DNA sequencing data.  As part of this project, the team participated in the assembly and comparison of both genomes, notably by developing new ways of reducing redundancy in assembly, due to the high rate of heterozygosity, and of identifying structural differences between the two genomes.
2 Food and Agriculture Organization of the United Nations
3 www.pesticideresistance.org
4 The FAW-IPC consortium brings together 65 experts from nine countries: Germany, Spain, France, Netherlands, Brazil, the United States, China, India and Australia.
5 A gene family results from the accumulation in a genome of several copies of an ancestral gene via different molecular mechanisms, including tandem duplications. These copies will be able to vary in their sequence by acquiring mutations which can either inactivate the gene or change its expression (allowing it, for example, to express itself in a new tissue of the insect), or change its function, compared to the ancestral copy. If the new copies give the insect a better chance at survival, they will remain in its genome in addition to the ancestral copies, which in the long run will lead to an expansion of the number of genes in the family.

Contact(s)
Scientific contact(s):

  • Emmanuelle d’Alençon (33 (0)4 67 14 47 20) Joint Research Unit for Diversity, Genomes & Microorganism-Insect Interactions (INRA, Université de Montpellier)
Press Relations:
INRA News Office (33 (0)1 42 75 91 86)
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Plant Health and Environment
Associated Centre(s):
Montpellier

reference

Anaïs Gouin, Anthony Bretaudeau, Kiwoong Nam, Sylvie Gimenez, Jean-Marc Aury, Bernard Duvic, Frédérique Hilliou, Nicolas Durand, Nicolas Montagné, Isabelle Darboux, Suyog Kuwar, Thomas Chertemps, David Siaussat, Anne Bretschneider, Yves Moné, Seung-Joon Ahn, Sabine Hänniger, Anne-Sophie Gosselin Grenet, David Neunemann, Florian Maumus, Isabelle Luyten, Karine Labadie, Wei Xu, Fotini Koutroumpa, Jean-Michel Escoubas, Angel Llopis, Martine Maïbèche-Coisne, Fanny Salasc, Archana Tomar, Alisha R. Anderson, Sher Afzal Khan, Pascaline Dumas, Marion Orsucci, Julie Guy, Caroline Belser, Adriana Alberti, Benjamin Noel, Arnaud Couloux, Jonathan Mercier, Sabine Nidelet, Emeric Dubois, Nai-Yong Liu, Isabelle Boulogne, Olivier Mirabeau, Gaelle Le Goff, Karl Gordon, John Oakeshott, Fernando L. Consoli, Anne-Nathalie Volkoff, Howard W. Fescemyer, James H. Marden, Dawn S. Luthe, Salvador Herrero, David G. Heckel, Patrick Wincker, Gael J. Kergoat, Joelle Amselem, Hadi Quesneville, Astrid T. Groot, Emmanuelle Jacquin-Joly, Nicolas Nègre, Claire Lemaitre, Fabrice Legeai, Emmanuelle d’Alençon & Philippe Fournier
Two genomes of highly polyphagous lepidopteran pests (Spodoptera frugiperda, Noctuidae) with different host-plant ranges.
Scientific Reports. 7. 11816 (2017)  doi: 10.1038/s41598-017-10461-4.