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Morphometric and molecular discrimination of the sugarcane aphid, Melanaphis sacchari, (Zehntner, 1897) and the sorghum aphid Melanaphis sorghi (Theobald, 1904).

Authors
  • Nibouche, Samuel1
  • Costet, Laurent1
  • Medina, Raul F2
  • Holt, Jocelyn R2
  • Sadeyen, Joëlle3
  • Zoogones, Anne-Sophie1, 3
  • Brown, Paul4
  • Blackman, Roger L4
  • 1 CIRAD, UMR PVBMT, Saint Pierre, La Réunion, France. , (France)
  • 2 Texas A&M University, College Station, Texas, United States of America. , (United States)
  • 3 UMR PVBMT, Université de La Réunion, Saint Pierre, La Réunion, France. , (France)
  • 4 The Natural History Museum, London, United Kingdom. , (United Kingdom)
Type
Published Article
Journal
PLoS ONE
Publisher
Public Library of Science
Publication Date
Jan 01, 2021
Volume
16
Issue
3
Identifiers
DOI: 10.1371/journal.pone.0241881
PMID: 33764987
Source
Medline
Language
English
License
Unknown

Abstract

Melanaphis sacchari (Zehntner, 1897) and Melanaphis sorghi (Theobald, 1904) are major worldwide crop pests causing direct feeding damage on sorghum and transmitting viruses to sugarcane. It is common in the scientific literature to consider these two species as synonyms, referred to as the 'sugarcane aphid', although no formal study has validated this synonymy. In this study, based on the comparison of samples collected from their whole distribution area, we use both morphometric and molecular data to better characterize the discrimination between M. sacchari and M. sorghi. An unsupervised multivariate analysis of morphometric data clearly confirmed the separation of the two species. The best discriminating characters separating these species were length of the antenna processus terminalis relative to length of hind tibia, siphunculus or cauda. However, those criteria sometimes do not allow an unambiguous identification. Bayesian clustering based on microsatellite data delimited two clusters, which corresponded to the morphological species separation. The DNA sequencing of three nuclear and three mitochondrial regions revealed slight divergence between species. In particular, the COI barcode region proved to be uninformative for species separation because one haplotype is shared by both species. In contrast, one SNP located on the nuclear EF1-α gene was diagnostic for species separation. Based on morphological and molecular evidence, the invasive genotype damaging to sorghum in the US, Mexico and the Caribbean since 2013 is found to be M. sorghi.

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