Molecular and Cytological Analyses of A and C Genomes at Meiosis in Synthetic Allotriploid Brassica Hybrids (ACC) between B.napus (AACC) and B.oleracea (CC)

文献类型： 外文期刊

第一作者： Yang, Yan

作者： Yang, Yan;Shi, Gongyao;Wei, Fang;Braynen, Janeen;Zhang, Jingshu;Tian, Baoming;Cao, Gangqiang;Wei, Xiaochun;Zhang, Xiaowei

作者机构：

关键词： A genome;Allotriploid Brassica hybrids;Meiosis;C genome;Chromosome synapsis and paring

期刊名称：JOURNAL OF PLANT BIOLOGY （ 影响因子：2.434； 五年影响因子：2.455 ）

ISSN： 1226-9239

年卷期： 2017 年 60 卷 2 期

页码：

收录情况： SCI

摘要： Success of interspecific hybridization relies mostly on the adequate similarity between the implicated genomes to ensure synapsis, pairing and recombination between appropriate chromosomes during meiosis in allopolyploid species. Allotetraploid Brassica napus (AACC) is a model of natural hybridization between Brassica rapa (AA) and Brassica oleracea (CC), which are originally derived from a common ancestor, but genomic constitution of the same chromosomes probably varied among these species through time after establishment, giving rise to cytogenetic difference in the synthetic hybrids. Herein we investigated meiotic behaviors of A and C chromosomes of synthetic allotriploid Brassica hybrids (ACC) at molecular and cytological levels, which result from the interspecific cross between natural B. napus (AACC) and B.oleracea (CC), and the results showed that meiosis course was significantly aberrant in allotriploid Brassica hybrids, and chromosomes aligned chaotically at metaphase I, chromosome bridges and lags were frequently observed from later metaphase I to anaphase II during meiosis. Simultaneously, we also noticed that meiosis-related genes were abruptly down-regulated in allotriploid Brassica hybrids, which likely accounted for irregular scenario of meiosis observed in these synthetic hybrids. Therefore, these results indicated that inter-genomic exchanges of A and C chromosomes could occur frequently in synthetic Brassica hybrids, and provided an efficient approach for genetic changes of homeologous chromosomes during meiosis in polyploid B.napus breeding program.

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