Chromosome numbers and meiotic analysis in the pre-breeding of <Emphasis Type="BoldItalic">Brachiaria decumbens</Emphasis> (Poaceae) |
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Authors: | GLÉIA CRISTINA LAVERDE RICCI ALICE MARIA DE SOUZA-KANESHIMA MARIANA FERRARI FELISMINO ANDREA BEATRIZ MENDES-BONATO MARIA SUELY PAGLIARINI CACILDA BORGES DO VALLE |
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Institution: | 1.Department of Cell Biology and Genetics,State University of Maringá,Maringá PR,Brazil;2.Embrapa Beef Cattle,Campo Grande MS,Brazil |
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Abstract: | A total of 44 accessions of Brachiaria decumbens were analysed for chromosome count and meiotic behaviour in order to identify potential progenitors for crosses. Among them,
15 accessions presented 2n = 18; 27 accessions, 2n = 36; and 2 accessions, 2n = 45 chromosomes. Among the diploid accessions, the rate of meiotic abnormalities was low, ranging from 0.82% to 7.93%. In
the 27 tetraploid accessions, the rate of meiotic abnormalities ranged from 18.41% to 65.83%. The most common meiotic abnormalities
were related to irregular chromosome segregation, but chromosome stickiness and abnormal cytokinesis were observed in low
frequency. All abnormalities can compromise pollen viability by generating unbalanced gametes. Based on the chromosome number
and meiotic stability, the present study indicates the apomictic tetraploid accessions that can act as male genitor to produce
interspecific hybrids with B. ruziziensis or intraspecific hybrids with recently artificially tetraploidized accessions. |
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