Insertion mutagenesis has become one of the most popular methods for gene functions analysis.Here we report a two-element Ac/Ds transposon system containing enhancer trap and gene trap for gene tagging in rice.The exc...Insertion mutagenesis has become one of the most popular methods for gene functions analysis.Here we report a two-element Ac/Ds transposon system containing enhancer trap and gene trap for gene tagging in rice.The excision of Ds element was examined by PCR amplification.The excision frequency of Ds element varied from 0% to 40% among 20 F2 populations derived from 11 different Ds parents.Southern blot analysis revealed that more than 70% of excised Ds elements reinserted into rice genome and above 70% of the reinserted Ds elements were located at different positions of the chromosome in rice.The result of histochemical GUS analysis indicated that 28% of enhancer trap and 22% of gene trap tagging plants displayed GUS activity in leaves, roots,flowers or seeds.The GUS positive lines will be useful for identifying gene function in rice.展开更多
Two plasmids, p13GUS and p13GUS2, were constructed to create a gene trap system containing the promotsriess β-glucuronidase （GUS） reporter gene in the T-DNA region. Transformation of these two plasmids into the ric...Two plasmids, p13GUS and p13GUS2, were constructed to create a gene trap system containing the promotsriess β-glucuronidase （GUS） reporter gene in the T-DNA region. Transformation of these two plasmids into the rice variety Zhonghua 11 （Oryza sativa ssp. japonica cv.）, mediated by Agrobacterium tumefaciens, resulted in 942 independent transgenic lines. Histochemical GUS assays revealed that 31 To plants had various patterns of the reporter gene expression, including expression in only one tissue, and simultaneously in two or more tissues. Hygromycin-resistsnt （hygr） homozygotes were screened and the copy number of the T-DNA inserts was determined in the GUS-positive transgenic plants. The flanking sequences of the T-DNA were isolated by inverse-polymerase chain reaction and the insert positions on the rice genome of T-DNA were determined by a basic local alignment search tool in the GUS-positive transgenic plants transformed with plasmid p13GUS. Moreover, calli induced from the seeds of the T1 generation of 911 GUS-negative transgenic lines were subjected to stress and hormone treatments. Histochemical GUS assays were carried out on the calli before and after treatment. The results revealed that calli from 21 lines displayed differential GUS expression after treatment. All of these data demonstrated that this trap system is suitable for identifying rice genes, including those that are sensitive to induction.展开更多
The fully sequenced genomes of Arabidopsis, rice, tomato, potato, ma ize, wheat, and soybean offer large amounts of information about cellular and de velopmental biology. It is a central challenge of genomics to use t...The fully sequenced genomes of Arabidopsis, rice, tomato, potato, ma ize, wheat, and soybean offer large amounts of information about cellular and de velopmental biology. It is a central challenge of genomics to use this informati on in discovering the function of proteins and identifying developmentally impor tant genes. Although classical genetic approaches to gene identification which r ely on disruption of a gene leading to a recognizable phenotype continues to be an extremely successful one, T-DNA mediated gene trap tagging which has been dev eloped that utilize random integration of reporter gene constructs has also prov en to be an extremely powerful tool in plant cellular developmental biology. In this review, how gene trap tagging, promoter trap tagging, and enhancer trap tag ging detection systems have been applied to plant biology is described and these gene identification techniques could be useful to the plant molecular biology a nd plant biotechnology community.展开更多
Since the hallmark discovery of Aequorea victoria＇s Green Fluorescent Protein （GFP） and its adaptation for efficient use in plants, fluorescent protein tags marking expression profiles or genuine proteins of intere...Since the hallmark discovery of Aequorea victoria＇s Green Fluorescent Protein （GFP） and its adaptation for efficient use in plants, fluorescent protein tags marking expression profiles or genuine proteins of interest have been used to recognize plant tissues and cell types, to monitor dynamic cell fate selection processes, and to obtain cell type-specific transcriptomes. Fluorescent tagging enabled visualization in living tissues and the precise recordings of dy- namic expression pattern changes. The resulting accurate recording of cell fate acquisition kinetics in space and time has strongly stimulated mathematical modeling of self-organizing feedback mechanisms. In developmental studies, the use of fluorescent proteins has become critical, where morphological markers of tissues, cell types, or differentiation stages are either not known or not easily recognizable. In this review, we focus on the use of fluorescent markers to identify and illuminate otherwise invisible cell states in plant development.展开更多
文摘Insertion mutagenesis has become one of the most popular methods for gene functions analysis.Here we report a two-element Ac/Ds transposon system containing enhancer trap and gene trap for gene tagging in rice.The excision of Ds element was examined by PCR amplification.The excision frequency of Ds element varied from 0% to 40% among 20 F2 populations derived from 11 different Ds parents.Southern blot analysis revealed that more than 70% of excised Ds elements reinserted into rice genome and above 70% of the reinserted Ds elements were located at different positions of the chromosome in rice.The result of histochemical GUS analysis indicated that 28% of enhancer trap and 22% of gene trap tagging plants displayed GUS activity in leaves, roots,flowers or seeds.The GUS positive lines will be useful for identifying gene function in rice.
基金grants from the Ministry of Science and Technology of China(2002AA2Z1003 and 2005CB120803).
文摘Two plasmids, p13GUS and p13GUS2, were constructed to create a gene trap system containing the promotsriess β-glucuronidase （GUS） reporter gene in the T-DNA region. Transformation of these two plasmids into the rice variety Zhonghua 11 （Oryza sativa ssp. japonica cv.）, mediated by Agrobacterium tumefaciens, resulted in 942 independent transgenic lines. Histochemical GUS assays revealed that 31 To plants had various patterns of the reporter gene expression, including expression in only one tissue, and simultaneously in two or more tissues. Hygromycin-resistsnt （hygr） homozygotes were screened and the copy number of the T-DNA inserts was determined in the GUS-positive transgenic plants. The flanking sequences of the T-DNA were isolated by inverse-polymerase chain reaction and the insert positions on the rice genome of T-DNA were determined by a basic local alignment search tool in the GUS-positive transgenic plants transformed with plasmid p13GUS. Moreover, calli induced from the seeds of the T1 generation of 911 GUS-negative transgenic lines were subjected to stress and hormone treatments. Histochemical GUS assays were carried out on the calli before and after treatment. The results revealed that calli from 21 lines displayed differential GUS expression after treatment. All of these data demonstrated that this trap system is suitable for identifying rice genes, including those that are sensitive to induction.
文摘The fully sequenced genomes of Arabidopsis, rice, tomato, potato, ma ize, wheat, and soybean offer large amounts of information about cellular and de velopmental biology. It is a central challenge of genomics to use this informati on in discovering the function of proteins and identifying developmentally impor tant genes. Although classical genetic approaches to gene identification which r ely on disruption of a gene leading to a recognizable phenotype continues to be an extremely successful one, T-DNA mediated gene trap tagging which has been dev eloped that utilize random integration of reporter gene constructs has also prov en to be an extremely powerful tool in plant cellular developmental biology. In this review, how gene trap tagging, promoter trap tagging, and enhancer trap tag ging detection systems have been applied to plant biology is described and these gene identification techniques could be useful to the plant molecular biology a nd plant biotechnology community.
文摘Since the hallmark discovery of Aequorea victoria＇s Green Fluorescent Protein （GFP） and its adaptation for efficient use in plants, fluorescent protein tags marking expression profiles or genuine proteins of interest have been used to recognize plant tissues and cell types, to monitor dynamic cell fate selection processes, and to obtain cell type-specific transcriptomes. Fluorescent tagging enabled visualization in living tissues and the precise recordings of dy- namic expression pattern changes. The resulting accurate recording of cell fate acquisition kinetics in space and time has strongly stimulated mathematical modeling of self-organizing feedback mechanisms. In developmental studies, the use of fluorescent proteins has become critical, where morphological markers of tissues, cell types, or differentiation stages are either not known or not easily recognizable. In this review, we focus on the use of fluorescent markers to identify and illuminate otherwise invisible cell states in plant development.
