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1.
Herbicide-resistant transgenic creeping bentgrass plants obtained by electroporation using an altered buffer 总被引:6,自引:0,他引:6
Modification of an electroporation buffer using Ca(NO3)2 and elevated pH (9–10) appeared to have a favorable effect on gene transfer to creeping bentgrass (Agrostis palustris Huds.) Penncross protoplasts, resulting in an increase in the transformation frequency of about twofold. Following electroporation
with the plasmid pARK22 containing the bar gene, a total of 278 bialaphos-resistant cell colonies were obtained from four experiments. The bialaphos-resistant regenerants
proved to be transgenic by Southern hybridization of the amplified DNA. All the tested transgenic plants showed herbicide
(HERBIE) resistance at the field rate of 0.5–1% (vol/vol). Ammonia contents in leaves after spraying with the herbicide increased
less in transgenic plants than in untransformed control plants.
Received: 10 February 1998 / Revision received: 8 April 1998 / Accepted: 24 April 1998 相似文献
2.
Phan Huy Bao Simona Granata Stefano Castiglione Gejiao Wang Chiara Giordani Elena Cuzzoni Giuseppe Damiani Claudio Bandi Swapan K. Datta Karabi Datta Ingo Potrykus Anna Callegarin Francesco Sala 《Transgenic research》1996,5(2):97-103
The occurrence of genomic modifications in transgenic rice plants recovered from protoplasts and their transmission to the self-pollination progeny has been verfied with the random amplified polymorphic DNA (RAPD) approach. The plant was the Indica-type rice (Oryza sativa L.) cultivar Chinsurah Boro II. The analysed material was: (1) microspore-derived embryogenic rice cells grown in suspension culture, (2) transgenic plants recovered from protoplasts produced from the cultured cells and (3) the self-pollination progeny (two successive generations) of the transgenic plants. DNA purified from samples of these materials was PCR-amplified with different random oligonucleotide primers and the amplification products were analysed by agarose gel electrophoresis. Band polymorphism was scored and used in band-sharing analyses to produce a similarity matrix. Relationships among the analysed genomes were expressed in a dendrogram.The extensive DNA changes evidenced in cultured cells demonstrate the occurrence of somaclonal variation in the material used to produce protoplasts for gene transfer. Quantitatively reduced DNA changes were also found in the resulting transgenic plants and i their self-pollination progenies.While confirming the stability of the foreign gene in transgenic plants, this work gives molecular evidence for the occurrence of stable genomic changes in transgenic plants and points toin vitro cell culture as the causative agent. RAPDs are shown to be a convenient tool to detect and estimate the phenomenon at the molecular level. The methodology is also proposed as a fast tool to select those transgenic individuals that retain the most balanced genomic structure and to control the result of back-crosses planned to restore the original genome. 相似文献
3.
Introduction and constitutive expression of a rice chitinase gene in bread wheat using biolistic bombardment and the bar gene as a selectable marker 总被引:13,自引:0,他引:13
W. P. Chen X. Gu G. H. Liang S. Muthukrishnan P. D. Chen D. J. Liu B. S. Gill 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1998,97(8):1296-1306
Our long-term goal is to control wheat diseases through the enhancement of host plant resistance. The constitutive expression
of plant defense genes to control fungal diseases can be engineered by genetic transformation. Our experimental strategy was
to biolistically transform wheat with a vector DNA containing a rice chitinase gene under the control of the CaMV 35 S promoter
and the bar gene under control of the ubiquitin promoter as a selectable marker. Immature embryos of wheat cv ‘Bobwhite’ were bombarded
with plasmid pAHG11 containing the rice chitinase gene chi11 and the bar gene. The embryos were subcultured on MS2 medium containing the herbicide bialaphos. Calli were then transferred to a regeneration
medium, also containing bialaphos. Seventeen herbicide-resistant putative transformants (T0) were selected after spraying with 0.2% Liberty, of which 16 showed bar gene expression as determined by the phosphinothricin acetyltransferase (PAT) assay. Of the 17 plants, 12 showed the expected
35-kDa rice chitinase as revealed by Western blot analysis. The majority of transgenic plants were morphologically normal
and self-fertile. The integration, inheritance and expression of the chi11 and bar genes were confirmed by Southern hybridization, PAT and Western blot analysis of T0 and T1 transgenic plants. Mendelian segregation of herbicide resistance was observed in some T1 progenies. Interestingly, a majority of the T1 progeny had very little or no chitinase expression even though the chitinase transgene was intact. Because PAT gene expression
under control of the ubiquitin promoter was unaffected, we conclude that the CaMV 35 S promoter is selectively inactivated
in T1 transgenic wheat plants.
Received: 12 May 1998 / Accepted: 15 May 1998 相似文献
4.
Use of bar as a selectable marker gene and for the production of herbicide-resistant rice plants from protoplasts 总被引:26,自引:0,他引:26
We have used the bar gene in combination with the herbicide Basta to select transformed rice (Oryza sativa L. cv. Radon) protoplasts for the production of herbicide-resistant rice plants. Protoplasts, obtained from regenerable suspension cultures established from immature embryo callus, were transformed using PEG-mediated DNA uptake. Transformed calli could be selected 2–4 weeks after placing the protoplast-derived calli on medium containing the selective agent, phosphinothricin (PPT), the active component of Basta. Calli resistant to PPT were capable of regenerating plants. Phosphinothricin acetyltransferase (PAT) assays confirmed the expression of the bar gene in plants obtained from PPT-resistant calli. The only exceptions were two plants obtained from the same callus that had multiple copies of the bar gene integrated into their genomes. The transgenic status of the plants was varified by Southern blot analysis. In our system, where the transformation was done via the protoplast method, there were very few escapes. The efficiency of co-transformation with a reporter gene gusA, was 30%. The To plants of Radon were self-fertile. Both the bar and gusA genes were transmitted to progeny as confirmed by Southern analysis. Both genes were expressed in T1 and T2 progenies. Enzyme analyses on T1 progeny plants also showed a gene dose response reflecting their homozygous and heterozygous status. The leaves of To plants and that of the progeny having the bar gene were resistant to application of Basta. Thus, the bar gene has proven to be a useful selectable and screenable marker for the transformation of rice plants and for the production of herbicide-resistant plants. 相似文献
5.
Linear transgene constructs lacking vector backbone sequences generate low-copy-number transgenic plants with simple integration patterns 总被引:28,自引:0,他引:28
Fu X Duc LT Fontana S Bong BB Tinjuangjun P Sudhakar D Twyman RM Christou P Kohli A 《Transgenic research》2000,9(1):11-19
Whole plasmids are used in both Agrobacterium-mediated transformation and direct DNA transfer, generally leading to the integration of vector backbone sequences into the host genome along with the transgene(s). This is undesirable, as vector backbone sequences often have negative effects on transgene or endogenous gene expression, and can promote transgene rearrangements. We, therefore, bombarded rice tissue with two constructs: a plasmid containing the bar gene, and a linear DNA fragment isolated from the same plasmid, corresponding to the minimal bar gene expression cassette (promoter, open reading frame and terminator). We recovered phosphinothricin-resistant plants from both experiments, showing that the selectable marker was efficiently expressed. Transformation with such constructs resulted in predominantly 'simple' integration events (one or two bands on Southern blots), producing low-copy-number transgenic plants with a low frequency of transgene rearrangements. Conversely, transformation with supercoiled or linearized whole plasmids generated plants with 'complex' integration patterns, that is, higher copy numbers and frequent transgene rearrangements. We monitored transgenic lines through to the R4 generation and observed no silencing in plants carrying minimal constructs. We also carried out experiments in which rice tissue was simultaneously bombarded with minimal linear hpt and gusA cassettes. We observed robust GUS activity in hygromycin-resistant plants, confirming co-expression of the selectable and nonselectable markers. Furthermore, the efficiency of cotransformation using minimal constructs was the same as that using supercoiled plasmid cointegrate vectors. 相似文献
6.
Physical,chemical and physiological parameters for electroporation-mediated gene delivery into rice protoplasts 总被引:1,自引:0,他引:1
Transformation of cereal protoplasts has been reported using several methods; however, the efficiencies of transformations are still very low. We have evaluated a number of parameters that influence electroporation-mediated DNA uptake and have also compared the efficiency of transient GUS activity and stable transformation obtained using an optimized electroporation method with that of the PEG method. The electroporation conditions tested were ionic composition of buffer, ionic strength, resistivity of buffer, type of anions, voltage, and capacitance.Protoplasts isolated from suspension cultures derived from immature embryos of rice (cvs Radon and IR-54) were used for this study. Stable transformation or transient GUS expression experiments were carried out using a plasmid construct containing the CaMV 35S promoter driving thebar gene and a rice actin promoter driving thegus A (uid A) gene (pAG35bar). Electroporation under optimized conditions resulted in about 13-fold higher GUS activities compared to the PEG method. Protoplast survival following optimized electroporation conditions was 55–60%, compared to 35–40% with the PEG treatment. Protoplasts isolated from a suspension culture at different ages gave substantially different levels of transient GUS expression following electroporation-mediated DNA uptake. In contrast, the age of the suspension culture did not influence PEG-mediated DNA uptake and transient GUS activities, which remained low throughout the culture period examined (21 months). Putatively transformed calluses were selected after three to four weeks on medium containing phosphinothricin as the selection agent. The transformation frequencies ranged from 6.2×10–5 to 5.4×10–4 with the electroporation method compared to 1.3×10–5 to 5.3×10–5 with the PEG method. Southern blot analysis of PPT-resistant calluses obtained by the electroporation-mediated transformation showed simple intergration patterns of integrated DNA in most of the transformants. 相似文献
7.
Activity of a maize ubiquitin promoter in transgenic rice 总被引:27,自引:0,他引:27
Maria-Jesús Cornejo Diane Luth Kathleen M. Blankenship Olin D. Anderson Ann E. Blechl 《Plant molecular biology》1993,23(3):567-581
We have used the maize ubiquitin 1 promoter, first exon and first intron (UBI) for rice (Oryza sativa L. cv. Taipei 309) transformation experiments and studied its expression in transgenic calli and plants. UBI directed significantly higher levels of transient gene expression than other promoter/intron combinations used for rice transformation. We exploited these high levels of expression to identify stable transformants obtained from callus-derived protoplasts co-transfected with two chimeric genes. The genes consisted of UBI fused to the coding regions of the uidA and bar marker genes (UBI:GUS and UBI:BAR). UBI:GUS expression increased in response to thermal stress in both transfected protoplasts and transgenic rice calli. Histochemical localization of GUS activity revealed that UBI was most active in rapidly dividing cells. This promoter is expressed in many, but not all, rice tissues and undergoes important changes in activity during the development of transgenic rice plants. 相似文献
8.
An efficient wheat transformation procedure: transformed calli with long-term morphogenic potential for plant regeneration 总被引:9,自引:0,他引:9
L. Zhang J. J. Rybczynski W. G. Langenberg A. Mitra R. French 《Plant cell reports》2000,19(3):241-250
A method for producing large numbers of transgenic wheat plants has been developed. With this approach, an average of 9.7%
of immature embryo explants were transformed and generated multiple self-fertile, independently transformed plants. No untransformed
plants, or escapes, were regenerated. This transformation procedure uses morphogenic calli derived from scutellum tissue of
immature embryos of Triticum aestivum cv. Bobwhite co-bombarded with separate plasmids carrying a selectable marker gene (bar) and a gene of interest, respectively. Transformed wheat calli with a vigorous growth phenotype were obtained by extended
culture on media containing 5.0 mg/l bialaphos. These calli retained morphogenic potential and were competent for plant regeneration
for as long as 11 months. The bar gene and the gene of interest were co-expressed in T0 progeny plants. This wheat transformation protocol may facilitate quantitative
production of multiple transgenic plants and significantly reduce the cost and labor otherwise required for screening out
untransformed escapes.
Received: 15 June 1998 / Revision received: 6 April 1999 / Accepted: 26 April 1999 相似文献
9.
Transfer of a grapevine stilbene synthase gene to rice (Oryza sativa L.) 总被引:17,自引:0,他引:17
P. Stark-Lorenzen B. Nelke G. Hänßler H. P. Mühlbach J. E. Thomzik 《Plant cell reports》1997,16(10):668-673
A gene derived from grapevine (Vitis vinifera) coding for stilbene synthase has been transferred into protoplasts of the commercially important japonica rice cultivar
Nipponbare using PEG-mediated direct gene transfer. Transgenic plants were regenerated from calli selected on kanamycin. Southern
blot analysis of genomic DNA isolated from regenerants and progeny plants demonstrated that the stilbene synthase gene is
stably integrated in the genome of transgenic rice plants and inherited in the offspring. The transient formation of stilbene-synthase-specific
mRNA shortly after inoculation with the fungus of the rice blast Pyricularia oryzae has demonstrated that the grapevine stilbene synthase promoter is also active in monocotyledonous plants. Preliminary results
indicate an enhanced resistance of transgenic rice to P. oryzae.
Received: 1 July 1996 / Revision received: 5 November 1996 / Accepted: 30 November 1996 相似文献
10.
K. Datta R. Velazhahan N. Oliva I. Ona T. Mew G. S. Khush S. Muthukrishnan S. K. Datta 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1999,98(6-7):1138-1145
A 1.1-kb DNA fragment containing the coding region of a thaumatin-like protein (TLP-D34), a member of the PR-5 group, was
cloned into the rice transformation vector pGL2, under the control of the CaMV 35S promoter. The Indica rice cultivars, ‘Chinsurah
Boro II’, ‘IR72’, and ‘IR51500’ were transformed with the tlp gene construct by PEG-mediated direct gene transfer to protoplasts and by biolistic transformation using immature embryos.
The presence of the chimeric gene in T0, T1, and T2 transgenic plants was detected by Southern blot analysis. The presence of the expected 23-kDa TLP in transgenic plants was
confirmed by Western blot analysis and by staining with Coomassie Brilliant Blue. Bioassays of transgenic plants challenged
with the sheath blight pathogen, Rhizoctonia solani, indicated that over-expression of TLP resulted in enhanced resistance compared to control plants.
Received: 11 August 1998 / Accepted: 26 August 1998 相似文献
11.
Transgenic plants with the herbicide-resistance gene (bar gene) were obtained via organogenesis from isolated mesophyll protoplasts of Nierembergia repens after applying electroporation. Transient β-glucuronidase (GUS) activity of electroporated protoplasts assayed 2 days after
applying an electric pulse showed that optimum condition (transient GUS activity 319 pmol 4 MU/mg per min and plating efficiency
2.43%) for electroporation was 0.5 kV/cm in field strength and 100 μF in capacitance. The protoplasts electroporated with
the bar gene at this condition initiated formation of microcolonies on medium after 2 weeks. After 4 weeks of culture, equal volume
of fresh 1/2-strength Murashige and Skoog (MS) medium containing 0.2 mg/l bialaphos was added for selection of transformed
colonies. After 6 weeks of culture, growing colonies were transferred onto regeneration medium containing 1.0 mg/l bialaphos,
on which they formed adventitious shoots 1–2 months after electroporation. The adventitious shoots rooted easily after transfer
onto MS medium with bialaphos lacking plant-growth regulators. Transformation of these regenerants with the bar gene was confirmed by Southern analysis. Some of the transformants showed strong resistance to the application of bialaphos
solution at 10.0 mg/l. 相似文献
12.
Narender S. Nehra Ravindra N. Chibbar Nick Leung Karen Caswell Cliff Mallard Lee Steinhauer Monica Baga Kutty K. Kartha 《The Plant journal : for cell and molecular biology》1994,5(2):285-297
A system for enhanced induction of somatic embryo-genesis and regeneration of plants from isolated scutellar tissue of wheat has been developed. This system has been successfully used in the development of a simple and reproducible protocol for the production of self-fertile transgenic wheat plants. The procedure is rapid resulting in the production of transgenic plantlets within 12 weeks from initiation of cultures and it avoids the need for establishing long-term callus, cell suspension or protoplast cultures. Somatic embryos regenerated from scutella bombarded with plasmid pBARGUS were selected on L-phosphinothricin (L-PPT) to obtain herbicide-resistant self-fertile transgenic plants. Phosphinothricin acetyltransferase (PAT) activity was observed at varying levels in 50% of the plants selected on L-PPT whereas none of the plants showed β-glucuronidase (GUS) activity. Molecular analysis of PAT-positive plants confirmed stable integration of both bar and gus genes in R0 and R1 progeny plants. Segregation of the PAT activity and herbicide resistance in R1 progeny plants confirmed the Mendelian inheritance of the bar gene. Additionally, isolated scutella bombarded with plasmid DNA containing a gus::nptII fusion gene driven by a rice actin promoter and its first intron were selected in the presence of geneticin to obtain fully fertile transgenic plants. Functional expression of the fusion gene was demonstrated in transgenic plants by GUS and neomycin phospho-transferase (NPTII) enzyme assays. Southern blot analysis confirmed the integration of transgenes into the wheat genome. Histochemical GUS staining showed transmission of the fusion gene to floral organs of primary transformants and confirmed Mendelian segregation of the transgene in R1 progeny. 相似文献
13.
Efficient regeneration of transgenic plants from rice protoplasts and correctly regulated expression of the foreign gene in the plants 总被引:6,自引:0,他引:6
W. Zhang R. Wu 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1988,76(6):835-840
Summary Rice is one of the most important crops in the world with 35% of the total population (over two billion people) depending on it as their source of food. It is therefore essential to develop efficient methods for the transformation and regeneration of rice plants in order to delineate the exact regulatory sequences responsible for gene expression and to transfer beneficial genes into this plant. Here, for the first time, we present definitive evidence for the regeneration of a large number of transgenic rice plants after introduction of the bacterial -glucuronidase gene into rice protoplasts. The presence of integrated copies of this gene was detected in the genome of transgenic plants by DNA hybridization analysis. Furthermore, under the control of regulatory regions from a maize alcohol dehydrogenase sequence, -glucuronidase gene expression was detected in the roots of transgenic plants. This expression was stimulated up to six fold under anaerobic conditions. 相似文献
14.
Transgenic rice plants produced by electroporation-mediated plasmid uptake into protoplasts 总被引:13,自引:0,他引:13
H. M. Zhang H. Yang E. L. Rech T. J. Golds A. S. Davis B. J. Mulligan E. C. Cocking M. R. Davey 《Plant cell reports》1988,7(6):379-384
Transgenic rice plants have been regenerated by somatic embryogenesis from cell suspension derived protoplasts electroporated with plasmid carrying the NPTII gene under the control of the 35S promoter from cauliflower mosaic virus. Heat shock of protoplasts prior to electroporation maximised the throughput of kanamycin resistant colonies. Omission of kanamycin from the medium for plant regeneration was essential for the recovery of transgenic rice plants carrying the NPTII gene. This report of the production of kanamycin resistant transgenic rice plants establishes the use of protoplasts for rice genetic engineering.Abbreviations NPTII
neomycin phosphotransferase
- SDS
sodium dodecyl sulphate 相似文献
15.
H. Kisaka H. Lee M. Kisaka A. Kanno K. Kang T. Kameya 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1994,89(2-3):365-371
Asymmetric hybrid plants were obtained from fused protoplasts of a monocotyledon (Oryza sativa L.) and a dicotyledon (Daucus carota L.). X-ray-irradiated protoplasts isolated from a cytoplasmic malesterile (cms) carrot suspension culture were fused with iodoacetoamide-treated protoplasts isolated from a 5-methyltryptophan (5MT)-resistant rice suspension culture by electrofusion. The complementary recovered cells divided and formed colonies, which were then cultivated on regeneration medium supplemented with 25mg/l 5MT to eliminate any escaped carrot cells. Somatic hybrids were regenerated from 5 of the 5MT-resistant colonies. The morphologies of most of the regenerated plants closely resembled that of the parental carrot plants. A cytological analysis of callus cultures induced from these plants indicated that most of the cells possessed 20–22 chromosomes and were resistant to 5MT. An isozyme analysis revealed that several regenerated plants had the peroxidase isozyme patterns of both parents. A Southern hybridization analysis with non-radioactively labelled DNA fragments of the rgp1 gene showed that regenerated plants had hybridizing bands from both rice and carrot. Chloroplast (cp) and mitochondrial (mt) DNAs were also analyzed by Southern hybridization by using several probes. CpDNA patterns of the regenerated plants were indistinguishable from those of the carrot parent. However 1 of the regenerated plants had a novel band pattern of mtDNA that was not detected in either of the parents, indicating a possible recombination of mitochondrial genomes. 相似文献
16.
Co-transformation of gene expression cassettes via particle bombardment to generate safe transgenic plant without any unwanted DNA 总被引:1,自引:0,他引:1
Yan Zhao Qian Qian Hui-Zhong Wang Da-Nian Huang 《In vitro cellular & developmental biology. Plant》2007,43(4):328-334
The presence of resistant selectable marker genes and other added DNAs such as the vector backbone sequence in transgenic
plant might be an unpredictable hazard to the ecosystem as well as to human health, which have affected the safe assessment
of transgenic plants seriously. Using minimal gene expression cassette (containing the promoter, coding region, and terminator)
without vector backbone sequence for particle bombardment is the new trend of plant genetic transformation. In the present
paper, we co-transformed the selectable marker bar gene cassette and non-selected cecropinB gene cassette into rice (Oryza sativa L.) by particle bombardment, then eliminated the selectable marker bar gene in R1 generation applying the hereditary segregation strategy and attained two safe transgenic plants only harboring cecropinB gene cassettes without any superfluous DNA. This is the fist report indicating that the combination of minimal gene cassettes
transformation with the co-transformation and segregation strategy can generate selectable marker-free transgenic plants,
which will promote the advancement in plant genetic engineering greatly. 相似文献
17.
H. Funatsuki H. Kuroda M. Kihara P. A. Lazzeri E. Müller H. Lörz I. Kishinami 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1995,91(5):707-712
We report the generation of transgenic barley plants via PEG-mediated direct DNA uptake to protoplasts. Protoplasts isolated from embryogenic cell suspensions of barley (Hordeum vulgare L. cv Igri) were PEG-treated in a solution containing a plasmid which contained the neomycin phosphotransferase (NPT II) gene under the control of the rice actin promoter and the nos terminator. Colonies developing from the treated protoplasts were incubated in liquid medium containing the selective antibiotic G418. Surviving calli were subsequently transferred to solid media containing G418, on which embryogenic calli developed. These calli gave rise to albino and green shoots on antibiotic-free regeneration medium. NPT II ELISA revealed that approximately half of the morphogenic calli expressed the foreign gene. In total, 12 plantlets derived from NPT-positive calli survived transfer to soil. Southern hybridization analysis confirmed the stable transformation of these plants. However, the foreign gene seemed to be inactivated in plants from one transgenic line. Most of the transgenic plants set seed, and the foreign gene was transmitted and expressed in their progenies, which was ascertained by Southern hybridization and NPT II ELISA. 相似文献
18.
Summary A rapid transformation and regeneration system has been developed forM. truncatula cv Jemalong (barrel medic) by which it is possible to obtain transgenic plants within 2.5 months. The procedure involvesAgrobacterium-mediated transformation of cotyledon explants coupled with the regeneration of transformed plants via direct organogenesis. To develop the procedure,M. truncatula explants were transformed with the binary plasmid pSLJ525 which carries thebar gene. Thebar gene encodes phosphinothricin acetyl transferase, and transformed plants were selected on media containing phosphinothricin (Ignite, AgrEvo). Transformed plants show phosphinothricin acetyl transferase activity and Southern blot analysis indicates that they carry thebar gene integrated into their genomes. The resistance to phosphinothricin is stable and is inherited by the R1 progeny as a single dominant Mendelian trait. The transgenic plants are highly resistant to the broad spectrum herbicide, Ignite and therefore may also have commercial applications. 相似文献
19.
B. Bhattacharjee Gynheung An H. S. Gupta 《Journal of plant biochemistry and biotechnology.》1997,6(2):69-73
We report production of fertile transgenic Indica rice plants by transferring a chimaeric construct consisting of promoter, first exon and intron of maize ubiquitin gene (Ubi-1) and the coding sequences of the bar gene from Streptomyces hygroscopicus to the rice protoplasts through electroporation. In total, 11 plants were regenerated. All of them were fertile and set seeds on maturity. These plants were resistant to high concentration of PPT (400 mg l?1) which was otherwise toxic to the untransformed controls. The gene was inherited to the progenies of the five plants in Mendelian ratio. 相似文献
20.
Regeneration of herbicide resistant transgenic rice plants following microprojectile-mediated transformation of suspension culture cells 总被引:22,自引:0,他引:22
Summary Suspension cells of Oryza sativa L. (rice) were transformed, by microprojectile bombardment, with plasmids carrying the coding region of the Streptomyces hygroscopicus phosphinothricin acetyl transferase (PAT) gene (bar) under the control of either the 5 region of the rice actin 1 gene (Act1) or the cauliflower mosaic virus (CaMV) 35S promoter. Subsequently regenerated plants display detectable PAT activity and are resistant to BASTATM, a phosphinothricin (PPT)-based herbicide. DNA gel blot analyses showed that PPT resistant rice plants contain a bar-hybridizing restriction fragment of the expected size. This report shows that expression of the bar gene in transgenic rice plants confers resistance to PPT-based herbicide by suppressing an increase of ammonia in plants after spraying with the herbicide. 相似文献