Genetic Diversity of Major Polyphagous Spider Mite Species across Host Plants and Spatial Distribution

Authors

  • A. A. Safeena Majeed Department of Agricultural Entomology, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga, Karnataka
  • N. Srinivasa Department of Agricultural Entomology, University of Agricultural Sciences, GKVK, Bengaluru, Karnataka
  • K. Rajashekharappa Department of Agricultural Entomology, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga, Karnataka
  • C. Chinnamadegowda Department of Agricultural Entomology, University of Agricultural Sciences, GKVK, Bengaluru, Karnataka
  • H. P. Rakesh Department of Agricultural Entomology, University of Agricultural Sciences, GKVK, Bengaluru, Karnataka

DOI:

https://doi.org/10.55446/IJE.2023.953

Keywords:

Tetranychid mites, Aponychus, Eutetranychus, Oligonychus, Petrobia, Schizotetranychus, Tetranychus genetic diversity, ITS2, neutrality test, phylogenetic analysis, host plants, cluster analysis, host range, polyphagous

Abstract

Different agroecosystems of southern Karnataka sampled for plant associated mites recorded six genera of tetranychid mites viz., Aponychus, Eutetranychus, Oligonychus, Petrobia, Schizotetranychus and Tetranychus. Neutrality test revealed a lowest haplotype diversity (0.993) of T. neocaledonicus population and Tajima’s D and Fu’s Fs test values were negatively significant for T. fijiensis, E. orientalis and S. baltazari populations, indicating the greater expansion of populations. Genetic analysis with ITS2 (rDNA) sequences revealed highest similarity between mite genera Petrobia and Aponychus showing lowest genetic distance of 0.51. Schizotetranychus has sister relationship with Eutetranychus which in turn clustered with Petrobia and Aponychus. Tetranychus and Oligonychus genera with lower genetic distance of 0.60 are clustered together. The study confirmed the clustering of morphologically related genera and lower genetic distances observed between related genera, expressed sister relationship. Molecular phylogenetic analysis of species under genus Oligonychus showed clustering in line with the morphology-based species taxonomic keys, while polyphagous species under the genus Tetranychus did not express form this grouping. Genetic diversity study of ten polyphagous mite species across their host plants and geographical occurrence revealed grouping according to locations in the phylogenetic tree. However, populations of Oligonychus tylus with a narrow host range showed close relationship for host plants than geographical locations which was evident in phylogenetic tree branching.

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Published

2023-12-01

How to Cite

Safeena Majeed, A. A., Srinivasa, N., Rajashekharappa, K., Chinnamadegowda, C., & Rakesh, H. P. (2023). Genetic Diversity of Major Polyphagous Spider Mite Species across Host Plants and Spatial Distribution. Indian Journal of Entomology, 85(4), 882–891. https://doi.org/10.55446/IJE.2023.953

Issue

Volume 85, Issue 4, December 2023

Section

Research Articles
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