its resistance against pathogens and diseases, among other purposes. Experts from about twenty institutions around the world participate in the article, under the direction of researchers Luis Rafael Herrera Estrella (Center for Research and Advanced Studies of the IPN, Irapuato, Mexico) and Víctor A. Albert, from the University of Buffalo (New York, United States). Avocado, the green gold of world agriculture For a long time, the consumption of this tropical fruit of the Persea genus – cultivated in South America since pre-Columbian times – has increased worldwide and has generated great economic interest in the market international. The international team has sequenced the genomes of two varieties of avocado plant, specifically the Mexican

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variety ( Persea americanavar. drymifolia ) and the Malawi Email Lists most popular commercial hybrid ( Persea americana Mill. cv. Hass). The genome of this tropical plant – organized into twelve chromosomes as known so far – is about 920 Mb in size, with small variations between the varieties studied, the new study points out. “The most relevant element of the genomic structure of avocado is the history of complete duplications of its genome”, details Julio Rozas, professor of Genetics and co-director, with professor Alejandro Sánchez Gracia, of the Research Group in Evolutionary Genomics and Bioinformatics of the Department of Genetics, Microbiology and Statistics of the UB and IRBio. Specifically, experts have compared the sythenia relationship – the

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order in which genes are conserved and positioned on the chromosomes – between the genomes of avocado and those of the species Amborella trichopoda Baill 1869. This species – a shrubby plant endemic to New Caledonia – is considered the only current representative of the most primitive lineage of flowering plants or angiosperms. In this primitive angiosperm there is no evidence of complete genomic duplications, and therefore it is the reference in the study of evolution by genomic duplication of all other flowering plants. Tandem duplications and resistance to attack by pathogens As the results indicate, “for the same region of the genome analyzed, there are four copies of genomic fragments in the case of avocado and a single copy in

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