利用赖氨酸类似物 L—4—氧赖氨酸(OL)作选择剂,通过组织培养,从秋此水稻成熟种胚的愈伤组织中筛选出 L—37、L—38,L—40,L—43抗 OL 突变轴胞系。突变细胞系愈伤组织在不含 OL 培养基上培养10代,对OL 仍有较高的抗性。突变细胞系的淀...利用赖氨酸类似物 L—4—氧赖氨酸(OL)作选择剂,通过组织培养,从秋此水稻成熟种胚的愈伤组织中筛选出 L—37、L—38,L—40,L—43抗 OL 突变轴胞系。突变细胞系愈伤组织在不含 OL 培养基上培养10代,对OL 仍有较高的抗性。突变细胞系的淀粉酶、酯酶、过氧化物酶同工酶的活性有所增加,18种氨基酸的含量均有增加,其中赖氨酸含量增加218.8%。L—37愈伤组织酯酶同工酶酶谱在快区前沿多了4条谱带。L—37、L—40得到了再生植株。展开更多
Artificial cyanophages are considered to be an effective biological method to control harmful cyanobacterial bloom.However,no synthetic cyanophage genome has been constructed and where its obstacles are unclear.Here,w...Artificial cyanophages are considered to be an effective biological method to control harmful cyanobacterial bloom.However,no synthetic cyanophage genome has been constructed and where its obstacles are unclear.Here,we survey a stretch of 16 kb length sequence of cyanophage A-4L that is unclonable in Escherichia coli.We test 12 predicted promoters of cyanophage A-4L which were verified all active in E.coli.Next,we screen for eight ORFs that hindered the assembly of intermediate DNA fragments in E.coli and describe that seven ORFs in the 16 kb sequence could not be separately cloned in E.coli.All of unclonable ORFs in high-copy-number plasmid were successfully cloned using low-copy-number vector,suggesting that these ORFs were copy-number-dependent.We propose a clone strategy abandoned the promotor and the start codon that could be applied for unclonable ORFs.Last,we de novo synthesized and assembled the full-length genome of cyanophage A-4L.This work deepens the understanding of synthetic cyanophages studies.展开更多
文摘利用赖氨酸类似物 L—4—氧赖氨酸(OL)作选择剂,通过组织培养,从秋此水稻成熟种胚的愈伤组织中筛选出 L—37、L—38,L—40,L—43抗 OL 突变轴胞系。突变细胞系愈伤组织在不含 OL 培养基上培养10代,对OL 仍有较高的抗性。突变细胞系的淀粉酶、酯酶、过氧化物酶同工酶的活性有所增加,18种氨基酸的含量均有增加,其中赖氨酸含量增加218.8%。L—37愈伤组织酯酶同工酶酶谱在快区前沿多了4条谱带。L—37、L—40得到了再生植株。
基金supported by the grants from the National Key Research and Development Program of China (No.2018YFA0903000)the National Natural Science Foundation of China (31901019)and the China Postdoctoral Science foundation (2021M692389).
文摘Artificial cyanophages are considered to be an effective biological method to control harmful cyanobacterial bloom.However,no synthetic cyanophage genome has been constructed and where its obstacles are unclear.Here,we survey a stretch of 16 kb length sequence of cyanophage A-4L that is unclonable in Escherichia coli.We test 12 predicted promoters of cyanophage A-4L which were verified all active in E.coli.Next,we screen for eight ORFs that hindered the assembly of intermediate DNA fragments in E.coli and describe that seven ORFs in the 16 kb sequence could not be separately cloned in E.coli.All of unclonable ORFs in high-copy-number plasmid were successfully cloned using low-copy-number vector,suggesting that these ORFs were copy-number-dependent.We propose a clone strategy abandoned the promotor and the start codon that could be applied for unclonable ORFs.Last,we de novo synthesized and assembled the full-length genome of cyanophage A-4L.This work deepens the understanding of synthetic cyanophages studies.
