Scholarlink

Background <p>The white-backed planthopper, <i>Sogatella furcifera</i> Horváth is a major rice pest in Asia, causing direct phloem-feeding damage and transmitting Southern rice black-streaked dwarf virus (SRBSDV). Despite its economic importance in India, information on its genetic diversity, population connectivity and demographic history remains limited.</p> Methods and Results <p>Mitochondrial cytochrome oxidase I (mtCOI) sequences (710&#xa0;bp) from 44 individuals representing 16 populations across nine Indian states were analysed to assess genetic structure. Phylogenetic analyses using Maximum Likelihood and Bayesian inference recovered a single monophyletic cluster with shallow divergence and no region-specific lineages. Three closely related haplotypes were detected, differing by a single mutation, with one dominant haplotype (H1) comprising 88.63% of individuals. Overall haplotype and nucleotide diversity were low (Hd = 0.342; π = 0.00057) and southern populations showed mitochondrial monomorphism under current sampling. AMOVA indicated that most genetic variation occurred within populations (92.68%), with only 7.32% among populations. Pairwise FST and gene flow analyses indicated heterogeneous connectivity, while isolation-by-distance analysis detected a significant positive correlation between genetic and geographic distances (<i>r</i> ≈ 0.50, <i>P</i> &lt; 0.05). Neutrality tests (Tajima’s D; Fu and Li’s D and F) were negative but non-significant. Bayesian Skyline Plot analysis indicated moderate historical fluctuations in effective population size without evidence of recent rapid expansion or severe bottlenecks.</p> Conclusions <p>Indian populations of <i>S. furcifera</i> exhibit low mitochondrial genetic differentiation, shallow spatial structuring and moderate isolation by distance. The overall pattern suggests demographic stability and substantial dispersal potential; however, inference is limited by the resolution of a single mitochondrial marker. These findings provide a baseline for understanding WBPH population dynamics in India and highlight the need for high-resolution nuclear markers to better resolve fine-scale structure relevant to migration monitoring and pest management.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

MtCOI-based genetic diversity and population structure of the White-Backed Planthopper, Sogatella furcifera Horváth across major rice ecosystems of India

  • 期刊论文

  • 发表日期：

    2026年4月3日

查看全文
  • Kokkula Akhilesh,
  • V. Chinna Babu Naik,
  • Gajendra Chandrakar,
  • K. A. V. Sindhura,
  • V. Papa Rao,
  • T. Prabhulinga,
  • R. M. Sundaram

摘要

Background

The white-backed planthopper, Sogatella furcifera Horváth is a major rice pest in Asia, causing direct phloem-feeding damage and transmitting Southern rice black-streaked dwarf virus (SRBSDV). Despite its economic importance in India, information on its genetic diversity, population connectivity and demographic history remains limited.

Methods and Results

Mitochondrial cytochrome oxidase I (mtCOI) sequences (710 bp) from 44 individuals representing 16 populations across nine Indian states were analysed to assess genetic structure. Phylogenetic analyses using Maximum Likelihood and Bayesian inference recovered a single monophyletic cluster with shallow divergence and no region-specific lineages. Three closely related haplotypes were detected, differing by a single mutation, with one dominant haplotype (H1) comprising 88.63% of individuals. Overall haplotype and nucleotide diversity were low (Hd = 0.342; π = 0.00057) and southern populations showed mitochondrial monomorphism under current sampling. AMOVA indicated that most genetic variation occurred within populations (92.68%), with only 7.32% among populations. Pairwise FST and gene flow analyses indicated heterogeneous connectivity, while isolation-by-distance analysis detected a significant positive correlation between genetic and geographic distances (r ≈ 0.50, P < 0.05). Neutrality tests (Tajima’s D; Fu and Li’s D and F) were negative but non-significant. Bayesian Skyline Plot analysis indicated moderate historical fluctuations in effective population size without evidence of recent rapid expansion or severe bottlenecks.

Conclusions

Indian populations of S. furcifera exhibit low mitochondrial genetic differentiation, shallow spatial structuring and moderate isolation by distance. The overall pattern suggests demographic stability and substantial dispersal potential; however, inference is limited by the resolution of a single mitochondrial marker. These findings provide a baseline for understanding WBPH population dynamics in India and highlight the need for high-resolution nuclear markers to better resolve fine-scale structure relevant to migration monitoring and pest management.