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Yan Yang1,Xiaochun Wei,Gongyao Shi,Fang Wei,Janeen Braynen,Jingshu Zhang,Baoming Tian,Gangqiang Cao,Xiaowei Zhang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.2
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.
Yue Liu,Zhaoran Tian,Xiaofei Zhang,Zhengqing Xie,Baoming Tian,Weiwei Chen,Jialin Guo,Xiaochun Wei,Fang Wei,Gongyao Shi 한국식물학회 2023 Journal of Plant Biology Vol.66 No.6
Gamete development is a complex process during the plant reproductive life cycle. A global vision of the molecular mechanisms regulating gametic development would enhance our understanding of developmental similarities and differences between male and female reproductive pathways in plants. In this study, we applied comparative transcriptomics to characterize gene expression during sporogenesis and gametogenesis in Arabidopsis. Compared with genes expressed in leaves, 11,112 and 10,133 differentially expressed genes (DEGs) were identified in the anthers and ovules, respectively. The shared DEGs exhibited a similar expression pattern regarding cell cycle and chromatin dynamics, but DEGs associated with cell wall formation and pectin modifications were prevalent during male development, reflecting dynamic changes during pollen wall development in anthers. In contrast, DEGs related to DNA repair, homologous recombination, and RNA-directed DNA methylation (RdDM) were comparatively over-represented in ovules, probably indicating a relatively intensified mechanism for supervising genome fidelity during female gametogenesis. In addition, DEGs related to brassinolide (BR) synthesis and signaling pathway were also highly enriched in ovules, suggesting a pivotal role in female gamete development. Collectively, our results provide a contrasting transcriptional atlas in developing anthers and ovules, and shed new light on our global understanding of gamete development in plants.