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Agave plants are important crassulacean acid metabolism (CAM) plants with multiple agricultural uses, such as being used in tequila and fiber production. Agave hybrid H11648 (( A . amaniensis Trel. and Nowell × A . angustifolia Haw.) × A . amaniensis ) is the main cultivated Agave species for fiber production in large tropical areas around the world. In this study, we conducted a transcriptome analysis of A . H11648. About 49.25 million clean reads were obtained by Illumina paired-end sequencing. De novo assembly produced 148,046 unigenes with more than 40% annotated in public databases, or matched homologs in model plants. More homologous gene pairs were found in Asparagus genome than in Arabidopsis or rice, which indicated a close evolutionary relationship between Asparagus and A . H11648. CAM-related gene families were also characterized as previously reported in A.  americana . We further identified 12 cellulose synthase genes ( CesA ) in Asparagus genome and 38 CesA sequences from A . H11648, A.  americana , A.  deserti and A.  tequilana . The full-length CesA genes were used as references for the cloning and assembly of their homologs in other Agave species. As a result, we obtained CesA1 / 3 / 4 / 5 / 7 genes with full-length coding region in the four A gave species. Phylogenetic and expression analysis revealed a conserved evolutionary pattern, which could not explain the distinct fiber traits in different Agave species. We inferred that transcriptional regulation might be responsible for Agave fiber development. This study represents the transcriptome of A . H11648, which would expand the number of Agave genes and benefit relevant studies of Agave fiber development.

De Novo Transcriptome Assembly of Agave H11648 by Illumina Sequencing and Identification of Cellulose Synthase Genes in Agave Species