Influence of rhinoceros beetle (Trypoxylus dichotomus septentrionalis) larvae and temperature on the soil bacterial community composition under laboratory conditions

Eo, Jinu; Na, Young‐Eun; Kim, Myung‐Hyun

doi:10.1016/j.soilbio.2016.12.005

Cited by 5 publications

(1 citation statement)

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“…T. dichotomus can secrete various digestive enzymes comprising cellulase, glycanase, and glycosidase to degrade lignocellulose-rich plant polymers [ 19 ], greatly promoting the formation of soil organic matter, the major pool of organic carbons [ 23 , 24 ]. To date, several studies have focused on the digestive enzymes and mutualistic associations with microbial symbionts in larval guts [ 19 , 21 , 25–27 ]. However, without the genome data of T. dichotomus , the underlying mechanisms enabling the digestion of lignocellulose will not be revealed.…”

Section: Introductionmentioning

confidence: 99%

A chromosome-level genome assembly and intestinal transcriptome of Trypoxylus dichotomus (Coleoptera: Scarabaeidae) to understand its lignocellulose digestion ability

Wang

Liu

Zhang³

et al. 2022

GigaScience

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Lignocellulose, as the key structural component of plant biomass, is a recalcitrant structure, difficult to degrade. The traditional management of plant waste, including landfill and incineration, usually causes serious environmental pollution and health problems. Interestingly, the xylophagous beetle, Trypoxylus dichotomus, can decompose lignocellulosic biomass. However, the genomics around the digestion mechanism of this beetle remain to be elucidated. Here, we assembled the genome of T. dichotomus, showing that the draft genome size of T. dichotomus is 636.27 Mb, with 95.37% scaffolds anchored onto 10 chromosomes. Phylogenetic results indicated that a divergent evolution between the ancestors of T. dichotomus and the closely related scarabaeid species Onthophagus taurus occurred in the early Cretaceous (120 million years ago). Through gene family evolution analysis, we found 67 rapidly evolving gene families, within which there were 2 digestive gene families (encoding Trypsin and Enoyl-(Acyl carrier protein) reductase) that have experienced significant expansion, indicating that they may contribute to the high degradation efficiency of lignocellulose in T. dichotomus. Additionally, events of chromosome breakage and rearrangement were observed by synteny analysis during the evolution of T. dichotomus due to chromosomes 6 and 8 of T. dichotomus being intersected with chromosomes 2 and 10 of Tribolium castaneum, respectively. Furthermore, the comparative transcriptome analyses of larval guts showed that the digestion-related genes were more commonly expressed in the midgut or mushroom residue group than the hindgut or sawdust group. This study reports the well-assembled and annotated genome of T. dichotomus, providing genomic and transcriptomic bases for further understanding the functional and evolutionary mechanisms of lignocellulose digestion in T. dichotomus.

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