152 research outputs found
Levantamento florĂstico das RodofĂceas do ArquipĂ©lago de SĂŁo Pedro e SĂŁo Paulo (ASPSP) - Brasil
Nitophyllum adhaerens (Ceramiales, Delesseriaceae), uma nova ocorrĂȘncia para o litoral brasileiro
Functional insights from the GC-poor genomes of two aphid parasitoids, Aphidius ervi and Lysiphlebus fabarum.
Parasitoid wasps have fascinating life cycles and play an important role in trophic networks, yet little is known about their genome content and function. Parasitoids that infect aphids are an important group with the potential for biological control. Their success depends on adapting to develop inside aphids and overcoming both host aphid defenses and their protective endosymbionts.
We present the de novo genome assemblies, detailed annotation, and comparative analysis of two closely related parasitoid wasps that target pest aphids: Aphidius ervi and Lysiphlebus fabarum (Hymenoptera: Braconidae: Aphidiinae). The genomes are small (139 and 141 Mbp) and the most AT-rich reported thus far for any arthropod (GC content: 25.8 and 23.8%). This nucleotide bias is accompanied by skewed codon usage and is stronger in genes with adult-biased expression. AT-richness may be the consequence of reduced genome size, a near absence of DNA methylation, and energy efficiency. We identify missing desaturase genes, whose absence may underlie mimicry in the cuticular hydrocarbon profile of L. fabarum. We highlight key gene groups including those underlying venom composition, chemosensory perception, and sex determination, as well as potential losses in immune pathway genes.
These findings are of fundamental interest for insect evolution and biological control applications. They provide a strong foundation for further functional studies into coevolution between parasitoids and their hosts. Both genomes are available at https://bipaa.genouest.org
Tipos de vegetação metalófila em åreas da serra de Carajås e de Minas Gerais, Brasil
The role of avian frugivores on germination and potential seed dispersal of the Brazilian Pepper Schinus terebinthifolius
Vigor de sementes de coentro (Coriandrum sativum L.) provenientes de sistemas orgĂąnico e convencional
Meios de cultura no desenvolvimento de ĂĄpices caulinares de mamoneira (Ricinus communis L.) in vitro
Variation of amphipod assemblage along the Sargassum stenophyllum (Phaeophyta, Fucales) thallus
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