Karyotype and leaf epidermis histology traits of Digitaria abyssinica (Hochst. Ex A. Rich.) (Poaceae).

Digitaria abyssinica (African couchgrass) has economic potential as forage. This species is taxonomically complex, with a high number of synonyms, basic chromosome number x = 9, and diploid and tetraploid cytotypes. Anatomical, histological, and cytotaxonomic studies may contribute to the taxonomic description of this species and reveal its polyploidization and hybridization events. To this end, this study aimed to characterize the karyotype and leaf epidermis histology of two D. abyssinica genotypes. Chromosome characterization was performed based on chromosome banding using chromomycin A (CMA) and 4,6-diamidino-2-phenylindole (DAPI) and identification of 35S and 5S rDNA sites by fluorescent in situ hybridization. Nuclear DNA quantification was performed by flow cytometry. Paradermal sections were obtained for the leaf epidermis study by light and electron microscopy. The results confirmed that both genotypes are tetraploid (2n = 36). The number and distribution of 35S and 5S rDNA sites suggest the occurrence of postpolyploidization structural chromosomal changes or hybridization processes. Despite intraspecific variation in the number of 5S rDNA sites and CMA+/DAPI+ bands, no changes were identified in karyotypical symmetry or genome size. Leaf epidermis histology traits and cytogenetic data can support breeding programs and germplasm banks in identifying species or cultivars.

Bibliographic Details

Main Authors:	CHAVES, A. L. A., CHIAVEGATTO, R. B., FERREIRA, M. T. M., ROCHA, L. C., AZEVEDO, A. L. S., BENITES, F. R. G., TECHIO, V. H.
Other Authors:	ANA LUISA ARANTES CHAVES, Universidade Federal de Lavras; RAQUEL BEZERRA CHIAVEGATTO, Universidade Federal de Lavras; MARCO TULIO MENDES FERREIRA, Universidade Federal de Lavras; LAIANE CORSINI ROCHA, Universidade Federal de Lavras; ANA LUISA SOUSA AZEVEDO, CNPGL; FLAVIO RODRIGO GANDOLFI BENITES, CNPGL; VÂNIA HELENA TECHIO, Universidade Federal de Lavras.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2021-08-13
Subjects:	Caracterização cromossômica, Heterocromatina, Polimorfismo cromossômico, Chromosomal polymorphism, Grama, Forragem, Poliploidia, Citotaxonomia, Polyploidy, Heterochromatin,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133568 https://doi.org/10.2478/s11756-020-00630-8
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