Title

Genomic Constitution and Relationship in Urochloa (Poaceae) Species and Hybrids.

Authors

de Paula, Cristina Maria Pinto; Sobrinho, Fausto Souza; Techio, Vânia Helena

Abstract

Urochloa P. Beauv. [syn. Brachiaria (Trin.) Griseb.] belongs to the family Poaceae and comprises species presenting different ploidy levels and modes of reproduction. Specific studies on genomic constitution and relationship within the genus Urochloa are limited, despite the great economic and agronomic importance of forage species and the high frequency of polyploids. Therefore, molecular cytogenetic analyses can enhance the knowledge about genomes and their differentiation, which allows making inferences about phylogenetic and genomic relationships. The current study aimed to investigate the genomic relationships between Urochloa ruziziensis (R. Germ. & Evrard) Crins (syn. Brachiaria ruziziensis Germain & Evrard.) cultivar 'Kennedy', Urochloa decumbens (Stapf) R. D. Webster [syn. Brachiaria decumbens (Stapf)] cultivar 'Basilisk', Urochloa brizantha (Hochst. ex. A. Rich.) R. D. Webster [syn. Brachiaria brizantha (A. Rich.) Stapf] cultivar 'Marandu', and their interspecific hybrids by means of genomic in situ hybridization, fluorescent in situ hybridization, and nuclear genome quantification by flow cytometry. We proposed the genomic constitution of U. ruziziensis, U. decumbens, and U. brizantha, such as B²B², B¹B¹B²B², and BBB¹B¹, respectively. Genomes B, B¹, and B² were considered to be homoeologous, but there was less affinity between genomes B and B².

Subjects

SIGNALGRASS; PLANT genomes; POLYPLOIDY in plant chromosomes

Publication

Crop Science, 2017, Vol 57, Issue 5, p2605

ISSN

0011-183X

Publication type

Academic Journal

DOI

10.2135/cropsci2017.05.0307