2010
DOI: 10.1590/s0103-90162010000200010
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Abstract: The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4 χ = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 -BRA003395). Three of them (HBGC313, HBGC 315, and HBGC324) were sexual and one (HBGC325) apomictic. Analyses of some cells in diakinesis revealed multivalent chromosome co… Show more

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Cited by 20 publications
(31 citation statements)
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“…In the six progenies, the mean percentage of abnormalities ranged from 16.6 % to 85.6 % ( Table 1). Except for P020, all progenies presented irregular chromosome segregation, a typical abnormality of polyploids and widely reported in tetraploid Brachiaria hybrids (Risso-Pascotto et al, 2005a;Fuzinatto et al, 2007a;Adamowski et al, 2008;Felismino et al, 2010). Irregular chromosome segregation was characterized by precocious chromosome migration to the poles ( Figure 1B), laggards ( Figure 1C), and micronuclei ( Figure 1D) in both meiotic divisions.…”
Section: Resultssupporting
confidence: 60%
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“…In the six progenies, the mean percentage of abnormalities ranged from 16.6 % to 85.6 % ( Table 1). Except for P020, all progenies presented irregular chromosome segregation, a typical abnormality of polyploids and widely reported in tetraploid Brachiaria hybrids (Risso-Pascotto et al, 2005a;Fuzinatto et al, 2007a;Adamowski et al, 2008;Felismino et al, 2010). Irregular chromosome segregation was characterized by precocious chromosome migration to the poles ( Figure 1B), laggards ( Figure 1C), and micronuclei ( Figure 1D) in both meiotic divisions.…”
Section: Resultssupporting
confidence: 60%
“…Several putative meiotic mutations have been reported among Brachiaria accessions (Mendes-Bonato et al, 2002bRisso-Pascotto et al, 2003, 2005bMendes-Vieira et al, 2005;Boldrini et al 2006;Gallo et al, 2007;Adamowski et al, 2007;Calisto et al, 2008) and in hybrids (Mendes-Bonato et al, 2004, 2006bRisso-Pascotto et al, 2005a;Fuzinatto et al, 2007ab;Adamowski et al, 2008;Felismino et al, 2008Felismino et al, , 2010. These putative mutations are frequently be-Sci.…”
Section: Resultsmentioning
confidence: 99%
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“…Interspecific Brachiaria hybrids between B. ruziziensis x B. brizantha have shown a considerable range of meiotic abnormalities which could impair pollen viability and seed production. In interspecific tetraploid hybrids within the genus, the problem can be compounded by the issues of genome affinity (Risso-Pascotto et al, 2005;Mendes-Bonato et al, 2006 b;Fuzinatto et al, 2007;Adamowski et al, 2008;Felismino et al, 2010;SouzaKaneshima et al, 2010). Theoretically, intraspecific hybridization should produce fewer meiotic abnormalities than interspecific hybridization, thus efforts were directed at identifying sexually compatible genitors to be crossed to the natural apomicts within the same species.…”
Section: Intraspecific Brachiaria Hybridsmentioning
confidence: 99%