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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.
Zhanzhong Wang,Qing Gu,Wenzhi Fang,Yan Li,Jingshu Zhang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
Protein crystallization is a complex physical and chemical process. The high-quality protein crystal is still apersistent bottleneck to the application of X-ray crystallography in structural biology. The additives may promote formationof crystal nucleus and subsequent growth in protein crystallization. As a distinct material, ionic liquids (ILs)have aroused great attention and interest for protein crystallization due to their unique properties. We reviewed the progressof protein crystallization and reported research about protein crystal morphology control by ILs, as crystal growthtemplate, in aqueous solutions. ILs encourage changes in some cases in terms of growth morphology and crystal size. The effect of ILs on lysozyme growth morphology can be attributed to changing interaction among lysozyme moleculesin aqueous solutions. This work can provide some initial insight into the preparation of high quality crystal and thedevelopment of new crystal form.