Rendón Anaya, Martha
- Department of Plant Biology, Swedish University of Agricultural Sciences
- Center for Research and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN)
Research article2019Peer reviewedOpen access
Rendon-Anaya, Martha; Ibarra-Laclette, Enrique; Mendez-Bravo, Alfonso; Lan, Tianying; Zheng, Chunfang; Carretero-Paulet, Lorenzo; Anahi Perez-Torres, Claudia; Chacon-Lopez, Alejandra; Hernandez-Guzman, Gustavo; Chang, Tien-Hao; Farr, Kimberly M.; Barbazuk, W. Brad; Chamala, Srikar; Mutwil, Marek; Shivhare, Devendra; Alvarez-Ponce, David; Mitter, Neena; Hayward, Alice; Fletcher, Stephen; Rozas, Julio;
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The avocado, Persea americana, is a fruit crop of immense importance to Mexican agriculture with an increasing demand worldwide. Avocado lies in the anciently diverged magnoliid clade of angiosperms, which has a controversial phylogenetic position relative to eudicots and monocots. We sequenced the nuclear genomes of the Mexican avocado race, P. americana var. drymifolia, and the most commercially popular hybrid cultivar, Hass, and anchored the latter to chromosomes using a genetic map. Resequencing of Guatemalan and West Indian varieties revealed that similar to 39% of the Hass genome represents Guatemalan source regions introgressed into a Mexican race background. Some introgressed blocks are extremely large, consistent with the recent origin of the cultivar. The avocado lineage experienced 2 lineage-specific polyploidy events during its evolutionary history. Although gene-tree/species-tree phylogenomic results are inconclusive, syntenic ortholog distances to other species place avocado as sister to the enormous monocot and eudicot lineages combined. Duplicate genes descending from polyploidy augmented the transcription factor diversity of avocado, while tandem duplicates enhanced the secondary metabolism of the species. Phenylpropanoid biosynthesis, known to be elicited by Colletotrichum (anthracnose) pathogen infection in avocado, is one enriched function among tandems. Furthermore, transcriptome data show that tandem duplicates are significantly up- and down-regulated in response to anthracnose infection, whereas polyploid duplicates are not, supporting the general view that collections of tandem duplicates contribute evolutionarily recent "tuning knobs" in the genome adaptive landscapes of given species.
avocado genome; angiosperm phylogeny; genome duplications; Phytophthora; genome evolution
Proceedings of the National Academy of Sciences of the United States of America
2019, Volume: 116, number: 34, pages: 17081-17089 Publisher: NATL ACAD SCIENCES
SLU Plant Protection Network
Agricultural Science
Evolutionary Biology
DOI: https://doi.org/10.1073/pnas.1822129116
https://res.slu.se/id/publ/101479