Meiotic behavior in interspecific hybrids between Brachiaria ruziziensis and Brachiaria brizantha (Poaceae)

The meiotic behavior of two half-sib interspecific tetraploid (2n = 4x = 36) promising hybrids, a sexual and an apomictic one, from crosses B. ruziziensis and B. brizantha, was evaluated. Although chromosome paired predominantly as bivalents, a few tri- and quadrivalents were recorded. Results sugge...

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Bibliographic Details
Published in:Euphytica 2005-09, Vol.145 (1-2), p.155-159
Main Authors: Risso-Pascotto, C, Pagliarini, M.S, Valle, C.B. do
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Brachiaria brizantha
Brachiaria ruziziensis
chromosome pairing
chromosome segregation
cytogenetics
Fertility
Flowers & plants
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
Hybridization
Hybrids
Interspecific and intergeneric hybridization, introgressions
interspecific hybridization
meiosis
plant breeding
Plant breeding: fundamental aspects and methodology
Plant reproduction
Poaceae
Pollen
Urochloa brizantha
Urochloa ruziziensis
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Summary:The meiotic behavior of two half-sib interspecific tetraploid (2n = 4x = 36) promising hybrids, a sexual and an apomictic one, from crosses B. ruziziensis and B. brizantha, was evaluated. Although chromosome paired predominantly as bivalents, a few tri- and quadrivalents were recorded. Results suggest that B. brizantha and B. ruziziensis are closely related and genetic recombination is expected in hybrids. Introgression of specific target genes from B. ruziziensis into B. brizantha and vice-versa may be foreseen. However, abnormalities such as irregular chromosome segregation, chromosome stickiness and abnormal cytokinesis reported in these hybrids affect pollen fertility. More than 65% of pollen grains are sterile. Since the distinctive cytological feature of these hybrids is abnormal cytokinesis, this fact suggests that both parental genomes are unable to coordinate their activities with regard to this cytological phenomenon. Deployment of such hybrids in the process of developing varieties is discussed.[PUBLICATION ABSTRACT]
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-005-0893-z