<p>The hexaploid wheat (<i>Triticum aestivum</i> L., genome BBAADD, 2<i>n</i> = 6<i>x</i> = 42) is one of the most important food crops. Enhancement and preservation its biodiversity is a key issue in the agrobiology of the twenty-first century. Related cultivated and wild species are the most practical source of this enhancement. The problem of genetic introgression is most successfully addressed by producing artificial amphidiploids and their subsequent use as "bridges" in breeding programs. Artificial amphidiploids are also a convenient model for solving genealogical issues of wheat. The karyotype formation and the genome stabilization of allopolyploid species are some of the most interesting points in evolutionary biology, because it is not enough to obtain between-species hybrids and to double their haploid genomes—it is required to restore their fertility. Intergeneric crosses undertaken within the tribe Triticeae Dumort led to quite a lot of fertile artificial amphidiploids possessing a wide variety of genome combinations, including the three elementary genomes of cultivated wheat. Among them are new forms (species) previously unknown in the nature. Following this study, we have added a new artificial hulled hexaploid amphidiploid, genome formula BBAASS, to the taxonomy of the genus <i>Triticum</i> under the name <i>Triticum aminovii</i> N.P. Gontsch. The karyotype of <i>T. aminovii</i> is provided, and its genome formula BBAASS has been validated by fluorescent in situ hybridization. The holotype of the new species is held in the I.M. Krasnoborov Herbarium (NS) of the Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences, voucher number NS0000947.</p>

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A new hexaploid wheat species Triticum aminovii

  • Nikolay P. Goncharov,
  • Irina G. Adonina

摘要

The hexaploid wheat (Triticum aestivum L., genome BBAADD, 2n = 6x = 42) is one of the most important food crops. Enhancement and preservation its biodiversity is a key issue in the agrobiology of the twenty-first century. Related cultivated and wild species are the most practical source of this enhancement. The problem of genetic introgression is most successfully addressed by producing artificial amphidiploids and their subsequent use as "bridges" in breeding programs. Artificial amphidiploids are also a convenient model for solving genealogical issues of wheat. The karyotype formation and the genome stabilization of allopolyploid species are some of the most interesting points in evolutionary biology, because it is not enough to obtain between-species hybrids and to double their haploid genomes—it is required to restore their fertility. Intergeneric crosses undertaken within the tribe Triticeae Dumort led to quite a lot of fertile artificial amphidiploids possessing a wide variety of genome combinations, including the three elementary genomes of cultivated wheat. Among them are new forms (species) previously unknown in the nature. Following this study, we have added a new artificial hulled hexaploid amphidiploid, genome formula BBAASS, to the taxonomy of the genus Triticum under the name Triticum aminovii N.P. Gontsch. The karyotype of T. aminovii is provided, and its genome formula BBAASS has been validated by fluorescent in situ hybridization. The holotype of the new species is held in the I.M. Krasnoborov Herbarium (NS) of the Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences, voucher number NS0000947.