Genome size evolution in grasshoppers (Orthoptera: Caelifera: Acrididae)

IF 4.7 1区 农林科学 Q1 ENTOMOLOGY Systematic Entomology Pub Date : 2023-02-14 DOI:10.1111/syen.12586
Kuo Sun, Yingchun Lu, Yuan Huang, Huateng Huang
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引用次数: 1

Abstract

Grasshoppers (Orthoptera: Acrididae) are known for their significantly enlarged genome compared to other insects. However, our understanding of the evolutionary dynamics of genome size (GS) with this family is still limited. This study measured the GS of 62 grasshopper species using flow cytometry and assembled 10 new mitochondrial genomes for comparative phylogenetic analyses. An expanded species sampling discovered several grasshopper species with giant GS surpassing the previous insect record. We then applied recently developed methods to test more complicated, heterogeneous evolutionary models. We found that grasshopper GS has a strong phylogenetic signal and does not correlate with species' body size or flight ability. These results support the neutral or near-neutral hypotheses of GS evolution. However, GS had accelerated rates of evolution on some grasshopper lineages, suggesting heterogeneity in its evolutionary dynamics. Ancestral state reconstruction indicates that the large genome evolved before the origin of the Acrididae family. Future studies with more species measurements will help assess the frequency of macroevolutionary shifts and identify possible mechanisms for these shifts in grasshopper GS evolution.

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蝗虫基因组大小的进化(直翅目:蝗科:蝗科)
众所周知,与其他昆虫相比,蝗虫(直翅目:蝗科)的基因组显著扩大。然而,我们对该家族基因组大小(GS)的进化动力学的理解仍然有限。本研究使用流式细胞术测量了62种蝗虫的GS,并组装了10个新的线粒体基因组进行比较系统发育分析。一项扩大的物种抽样发现了几种蝗虫物种,其巨大的GS超过了以前的昆虫记录。然后,我们应用最近开发的方法来测试更复杂、异质的进化模型。我们发现蚱蜢GS具有强烈的系统发育信号,与物种的体型或飞行能力无关。这些结果支持GS进化的中性或接近中性假设。然而,GS加速了一些蝗虫谱系的进化速度,这表明其进化动力学存在异质性。祖先状态重建表明,大基因组是在蝗科起源之前进化而来的。未来对更多物种进行测量的研究将有助于评估宏观进化变化的频率,并确定蝗虫GS进化中这些变化的可能机制。
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来源期刊
Systematic Entomology
Systematic Entomology 生物-进化生物学
CiteScore
10.50
自引率
8.30%
发文量
49
审稿时长
>12 weeks
期刊介绍: Systematic Entomology publishes original papers on insect systematics, phylogenetics and integrative taxonomy, with a preference for general interest papers of broad biological, evolutionary or zoogeographical relevance.
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