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首页> 外文期刊>Journal of genetics >Chromosome numbers and meiotic analysis in the pre-breeding of Brachiaria decumbens (Poaceae)
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Chromosome numbers and meiotic analysis in the pre-breeding of Brachiaria decumbens (Poaceae)

机译：臂状臂锈菌（禾本科）预育中的染色体数目和减数分裂分析

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摘要

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.
机译：为了鉴定潜在的杂交祖先，共分析了44种脱枝的臂状臂锈菌的染色体数和减数分裂行为。其中有15个材料的出价为$ 2n = 18 $; 27个加入，$ 2n = 36 $;和2个种，$ 2n = 45 $个染色体。在二倍体种质中，减数分裂异常的发生率很低，在0.82％至7.93％之间。在27个四倍体种中，减数分裂异常率在18.41％至65.83％之间。最常见的减数分裂异常与不规则的染色体分离有关，但是在低频下观察到染色体粘性和胞质分裂异常。所有异常都会通过产生不平衡的配子而损害花粉的生存能力。基于染色体数和减数分裂稳定性，本研究表明了可以作为雄性祖先的无融合生殖四倍体种质，与鲁氏紫菜产生种间杂种，或最近人工四倍体化种质产生种内杂种。

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