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Correction published on 1 March 2021, see Plants 2021, 10(3), 463.
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Article

Intragenomic Polymorphism of the ITS 1 Region of 35S rRNA Gene in the Group of Grasses with Two-Chromosome Species: Different Genome Composition in Closely Related Zingeria Species

by
Alexander V. Rodionov
1,2,
Alexander A. Gnutikov
3,
Nikolai N. Nosov
1,
Eduard M. Machs
1,
Yulia V. Mikhaylova
1,
Victoria S. Shneyer
1,* and
Elizaveta O. Punina
1
1
Laboratory of Biosystematics and Cytology, Komarov Botanical Institute of the Russian Academy of Sciences, 197376 St. Petersburg, Russia
2
Biological Faculty, St. Petersburg State University, 199034 St. Petersburg, Russia
3
Department of Genetic Resources of Oat, Barley, Rye, N.I. Vavilov Institute of Plant Genetic Resources (VIR), 190000 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Plants 2020, 9(12), 1647; https://doi.org/10.3390/plants9121647
Submission received: 13 October 2020 / Revised: 20 November 2020 / Accepted: 22 November 2020 / Published: 25 November 2020
(This article belongs to the Special Issue Plant Molecular Phylogenetics and Evolutionary Genomics)
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Abstract

Zingeria (Poaceae) is a small genus that includes Z. biebersteiniana, a diploid species with the lowest chromosome number known in plants (2n = 4) as well as hexaploid Z. kochii and tetraploid Z. pisidica, and/or Z. trichopoda species. The relationship between these species and the other low-chromosomes species Colpodium versicolor are unclear. To explore the intragenomic polymorphism and genome composition of these species we examined the sequences of the internal transcribed spacer 1 of the 35S rRNA gene via NGS approach. Our study revealed six groups of ribotypes in Zingeria species. Their distribution confirmed the allopolyploid nature of Z. kochii, whose probable ancestors were Colpodium versicolor and Z. pisidica. Z. pisidica has 98% of rDNA characteristic only for this species, and about 0.3% of rDNA related to that of Z. biebersteiniana. We assume that hexaploid Z. kochii is either an old allopolyploid or a homodiploid that has lost most of the rRNA genes obtained from Z. biebersteiniana. In Z. trichopoda about 81% of rDNA is related to rDNA of Z. biebersteiniana and 19% of rDNA is derived from Poa diaphora sensu lato. The composition of the ribotypes of the two plants determined by a taxonomy specialist as Z. pisidica and Z. trichopoda is very different. Two singleton species are proposed on this base with ribotypes as discriminative characters. So, in all four studied Zingeria species, even if the morphological difference among the studied species was modest, the genomic constitution was significantly different, which suggests that these are allopolyploids that obtained genomes from different ancestors.
Keywords: taxonomy; evolutionary genomics; grasses; allopolyploidy; Zingeria taxonomy; evolutionary genomics; grasses; allopolyploidy; Zingeria

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MDPI and ACS Style

Rodionov, A.V.; Gnutikov, A.A.; Nosov, N.N.; Machs, E.M.; Mikhaylova, Y.V.; Shneyer, V.S.; Punina, E.O. Intragenomic Polymorphism of the ITS 1 Region of 35S rRNA Gene in the Group of Grasses with Two-Chromosome Species: Different Genome Composition in Closely Related Zingeria Species. Plants 2020, 9, 1647. https://doi.org/10.3390/plants9121647

AMA Style

Rodionov AV, Gnutikov AA, Nosov NN, Machs EM, Mikhaylova YV, Shneyer VS, Punina EO. Intragenomic Polymorphism of the ITS 1 Region of 35S rRNA Gene in the Group of Grasses with Two-Chromosome Species: Different Genome Composition in Closely Related Zingeria Species. Plants. 2020; 9(12):1647. https://doi.org/10.3390/plants9121647

Chicago/Turabian Style

Rodionov, Alexander V., Alexander A. Gnutikov, Nikolai N. Nosov, Eduard M. Machs, Yulia V. Mikhaylova, Victoria S. Shneyer, and Elizaveta O. Punina. 2020. "Intragenomic Polymorphism of the ITS 1 Region of 35S rRNA Gene in the Group of Grasses with Two-Chromosome Species: Different Genome Composition in Closely Related Zingeria Species" Plants 9, no. 12: 1647. https://doi.org/10.3390/plants9121647

APA Style

Rodionov, A. V., Gnutikov, A. A., Nosov, N. N., Machs, E. M., Mikhaylova, Y. V., Shneyer, V. S., & Punina, E. O. (2020). Intragenomic Polymorphism of the ITS 1 Region of 35S rRNA Gene in the Group of Grasses with Two-Chromosome Species: Different Genome Composition in Closely Related Zingeria Species. Plants, 9(12), 1647. https://doi.org/10.3390/plants9121647

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