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Ntakirutimana F, Tranchant-Dubreuil C, Cubry P, Chougule K, Zhang J, Wing RA, Adam H, Lorieux M, Jouannic S. Genome-wide association analysis identifies natural allelic variants associated with panicle architecture variation in African rice, Oryza glaberrima Steud. G3 (BETHESDA, MD.) 2023; 13:jkad174. [PMID: 37535690 PMCID: PMC10542218 DOI: 10.1093/g3journal/jkad174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 06/12/2023] [Accepted: 07/18/2023] [Indexed: 08/05/2023]
Abstract
African rice (Oryza glaberrima Steud), a short-day cereal crop closely related to Asian rice (Oryza sativa L.), has been cultivated in Sub-Saharan Africa for ∼ 3,000 years. Although less cultivated globally, it is a valuable genetic resource in creating high-yielding cultivars that are better adapted to diverse biotic and abiotic stresses. While inflorescence architecture, a key trait for rice grain yield improvement, has been extensively studied in Asian rice, the morphological and genetic determinants of this complex trait are less understood in African rice. In this study, using a previously developed association panel of 162 O. glaberrima accessions and new SNP variants characterized through mapping to a new version of the O. glaberrima reference genome, we conducted a genome-wide association study of four major morphological panicle traits. We have found a total of 41 stable genomic regions that are significantly associated with these traits, of which 13 co-localized with previously identified QTLs in O. sativa populations and 28 were unique for this association panel. Additionally, we found a genomic region of interest on chromosome 3 that was associated with the number of spikelets and primary and secondary branches. Within this region was localized the O. sativa ortholog of the PHYTOCHROME B gene (Oglab_006903/OgPHYB). Haplotype analysis revealed the occurrence of natural sequence variants at the OgPHYB locus associated with panicle architecture variation through modulation of the flowering time phenotype, whereas no equivalent alleles were found in O. sativa. The identification in this study of genomic regions specific to O. glaberrima indicates panicle-related intra-specific genetic variation in this species, increasing our understanding of the underlying molecular processes governing panicle architecture. Identified candidate genes and major haplotypes may facilitate the breeding of new African rice cultivars with preferred panicle traits.
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Affiliation(s)
| | | | - Philippe Cubry
- DIADE, University of Montpellier, IRD, CIRAD, 34394 Montpellier, France
| | - Kapeel Chougule
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA
| | - Jianwei Zhang
- Arizona Genomics Institute, School of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China
| | - Rod A Wing
- Arizona Genomics Institute, School of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA
- Center for Desert Agriculture, Biological and Environmental Sciences & Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Hélène Adam
- DIADE, University of Montpellier, IRD, CIRAD, 34394 Montpellier, France
| | - Mathias Lorieux
- DIADE, University of Montpellier, IRD, CIRAD, 34394 Montpellier, France
| | - Stefan Jouannic
- DIADE, University of Montpellier, IRD, CIRAD, 34394 Montpellier, France
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Mmbando GS. Challenges and prospects in using biotechnological interventions in O. glaberrima, an African cultivated rice. GM CROPS & FOOD 2022; 13:372-387. [DOI: 10.1080/21645698.2022.2149212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Gideon Sadikiel Mmbando
- Department of Biology, College of Natural and Mathematical Sciences, University of Dodoma (Udom), Dodoma, Tanzania
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Ogata T, Ishizaki T, Fujita M, Fujita Y. CRISPR/Cas9-targeted mutagenesis of OsERA1 confers enhanced responses to abscisic acid and drought stress and increased primary root growth under nonstressed conditions in rice. PLoS One 2020; 15:e0243376. [PMID: 33270810 PMCID: PMC7714338 DOI: 10.1371/journal.pone.0243376] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 11/19/2020] [Indexed: 01/10/2023] Open
Abstract
Abscisic acid (ABA) signaling components play an important role in the drought stress response in plants. Arabidopsis thaliana ENHANCED RESPONSE TO ABA1 (ERA1) encodes the β-subunit of farnesyltransferase and regulates ABA signaling and the dehydration response. Therefore, ERA1 is an important candidate gene for enhancing drought tolerance in numerous crops. However, a rice (Oryza sativa) ERA1 homolog has not been characterized previously. Here, we show that rice osera1 mutant lines, harboring CRISPR/Cas9-induced frameshift mutations, exhibit similar leaf growth as control plants but increased primary root growth. The osera1 mutant lines also display increased sensitivity to ABA and an enhanced response to drought stress through stomatal regulation. These results illustrate that OsERA1 is a negative regulator of primary root growth under nonstressed conditions and also of responses to ABA and drought stress in rice. These findings improve our understanding of the role of ABA signaling in the drought stress response in rice and suggest a strategy to genetically improve rice.
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Affiliation(s)
- Takuya Ogata
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, Japan
| | - Takuma Ishizaki
- Tropical Agriculture Research Front (TARF), Japan International Research Center for Agricultural Sciences (JIRCAS), Ishigaki, Okinawa, Japan
| | - Miki Fujita
- RIKEN Center for Sustainable Resource Science, Tsukuba, Ibaraki, Japan
| | - Yasunari Fujita
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, Japan
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- * E-mail:
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Selvaraj MG, Jan A, Ishizaki T, Valencia M, Dedicova B, Maruyama K, Ogata T, Todaka D, Yamaguchi‐Shinozaki K, Nakashima K, Ishitani M. Expression of the CCCH-tandem zinc finger protein gene OsTZF5 under a stress-inducible promoter mitigates the effect of drought stress on rice grain yield under field conditions. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:1711-1721. [PMID: 31930666 PMCID: PMC7336284 DOI: 10.1111/pbi.13334] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 12/24/2019] [Accepted: 01/05/2020] [Indexed: 05/09/2023]
Abstract
Increasing drought resistance without sacrificing grain yield remains an ongoing challenge in crop improvement. In this study, we report that Oryza sativa CCCH-tandem zinc finger protein 5 (OsTZF5) can confer drought resistance and increase grain yield in transgenic rice plants. Expression of OsTZF5 was induced by abscisic acid, dehydration and cold stress. Upon stress, OsTZF5-GFP localized to the cytoplasm and cytoplasmic foci. Transgenic rice plants overexpressing OsTZF5 under the constitutive maize ubiquitin promoter exhibited improved survival under drought but also growth retardation. By introducing OsTZF5 behind the stress-responsive OsNAC6 promoter in two commercial upland cultivars, Curinga and NERICA4, we obtained transgenic plants that showed no growth retardation. Moreover, these plants exhibited significantly increased grain yield compared to non-transgenic cultivars in different confined field drought environments. Physiological analysis indicated that OsTZF5 promoted both drought tolerance and drought avoidance. Collectively, our results provide strong evidence that OsTZF5 is a useful biotechnological tool to minimize yield losses in rice grown under drought conditions.
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Affiliation(s)
| | - Asad Jan
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
- Present address:
Institute of Biotechnology and Genetic EngineeringThe University of AgriculturePeshawarKhyber PakhtunkhwaPakistan
| | - Takuma Ishizaki
- Tropical Agriculture Research Front (TARF)Japan International Research Center for Agricultural Sciences (JIRCAS)IshigakiOkinawaJapan
| | - Milton Valencia
- International Center for Tropical Agriculture (CIAT)CaliColombia
| | - Beata Dedicova
- International Center for Tropical Agriculture (CIAT)CaliColombia
| | - Kyonoshin Maruyama
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Takuya Ogata
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Daisuke Todaka
- Laboratory of Plant Molecular PhysiologyGraduate School of Agricultural and Life SciencesThe University of TokyoBunkyo‐kuTokyoJapan
| | - Kazuko Yamaguchi‐Shinozaki
- Laboratory of Plant Molecular PhysiologyGraduate School of Agricultural and Life SciencesThe University of TokyoBunkyo‐kuTokyoJapan
| | - Kazuo Nakashima
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Manabu Ishitani
- International Center for Tropical Agriculture (CIAT)CaliColombia
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Shinya T, Yasuda S, Hyodo K, Tani R, Hojo Y, Fujiwara Y, Hiruma K, Ishizaki T, Fujita Y, Saijo Y, Galis I. Integration of danger peptide signals with herbivore-associated molecular pattern signaling amplifies anti-herbivore defense responses in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 94:626-637. [PMID: 29513388 DOI: 10.1111/tpj.13883] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 02/09/2018] [Accepted: 02/14/2018] [Indexed: 05/22/2023]
Abstract
Plant defense against herbivores is modulated by herbivore-associated molecular patterns (HAMPs) from oral secretions (OS) and/or saliva of insects. Furthermore, feeding wounds initiate plant self-damage responses modulated by danger-associated molecular patterns (DAMPs) such as immune defense-promoting plant elicitor peptides (Peps). While temporal and spatial co-existence of both patterns during herbivory implies a possibility of their close interaction, the molecular mechanisms remain undetermined. Here we report that exogenous application of rice (Oryza sativa) peptides (OsPeps) can elicit multiple defense responses in rice cell cultures. Specific activation of OsPROPEP3 gene transcripts in rice leaves by wounding and OS treatments further suggests a possible involvement of the OsPep3 peptide in rice-herbivore interactions. Correspondingly, we found that simultaneous application of OsPep3 and Mythimna loreyi OS significantly amplifies an array of defense responses in rice cells, including mitogen-activated protein kinase activation, and generation of defense-related hormones and metabolites. The induction of OsPROPEP3/4 by OsPep3 points to a positive auto-feedback loop in OsPep signaling which may contribute to additional enhancement of defense signal(s). Finally, the overexpression of the OsPep receptor OsPEPR1 increases the sensitivity of rice plants not only to the cognate OsPeps but also to OS signals. Our findings collectively suggest that HAMP-DAMP signal integration provides a critical step in the amplification of defense signaling in plants.
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Affiliation(s)
- Tomonori Shinya
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Shigetaka Yasuda
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Kiwamu Hyodo
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Rena Tani
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Yuko Hojo
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Yuka Fujiwara
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Kei Hiruma
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
- Japan Science and Technology (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Kawaguchi, Saitama, 332-0012, Japan
| | - Takuma Ishizaki
- Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences (JIRCAS), Ishigaki, Okinawa, 907-0002, Japan
| | - Yasunari Fujita
- Biological Resources and Post-Harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, 305-8686, Japan
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
| | - Yusuke Saijo
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
- Japan Science and Technology (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Kawaguchi, Saitama, 332-0012, Japan
| | - Ivan Galis
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
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Selvaraj MG, Ishizaki T, Valencia M, Ogawa S, Dedicova B, Ogata T, Yoshiwara K, Maruyama K, Kusano M, Saito K, Takahashi F, Shinozaki K, Nakashima K, Ishitani M. Overexpression of an Arabidopsis thaliana galactinol synthase gene improves drought tolerance in transgenic rice and increased grain yield in the field. PLANT BIOTECHNOLOGY JOURNAL 2017; 15:1465-1477. [PMID: 28378532 PMCID: PMC5633756 DOI: 10.1111/pbi.12731] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 02/10/2017] [Accepted: 03/16/2017] [Indexed: 05/03/2023]
Abstract
Drought stress has often caused significant decreases in crop production which could be associated with global warming. Enhancing drought tolerance without a grain yield penalty has been a great challenge in crop improvement. Here, we report the Arabidopsis thaliana galactinol synthase 2 gene (AtGolS2) was able to confer drought tolerance and increase grain yield in two different rice (Oryza sativa) genotypes under dry field conditions. The developed transgenic lines expressing AtGolS2 under the control of the constitutive maize ubiquitin promoter (Ubi:AtGolS2) also had higher levels of galactinol than the non-transgenic control. The increased grain yield of the transgenic rice under drought conditions was related to a higher number of panicles, grain fertility and biomass. Extensive confined field trials using Ubi:AtGolS2 transgenic lines in Curinga, tropical japonica and NERICA4, interspecific hybrid across two different seasons and environments revealed the verified lines have the proven field drought tolerance of the Ubi:AtGolS2 transgenic rice. The amended drought tolerance was associated with higher relative water content of leaves, higher photosynthesis activity, lesser reduction in plant growth and faster recovering ability. Collectively, our results provide strong evidence that AtGolS2 is a useful biotechnological tool to reduce grain yield losses in rice beyond genetic differences under field drought stress.
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Affiliation(s)
| | - Takuma Ishizaki
- Tropical Agriculture Research Front (TARF)Japan International Research Center for Agricultural Sciences (JIRCAS)IshigakiOkinawaJapan
| | - Milton Valencia
- International Center for Tropical Agriculture (CIAT)CaliColombia
| | - Satoshi Ogawa
- International Center for Tropical Agriculture (CIAT)CaliColombia
- Japan Society for the Promotion of ScienceThe University of TokyoBunkyo‐kuTokyoJapan
| | - Beata Dedicova
- International Center for Tropical Agriculture (CIAT)CaliColombia
| | - Takuya Ogata
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Kyouko Yoshiwara
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Kyonoshin Maruyama
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Miyako Kusano
- RIKEN Center for Sustainable Resource ScienceYokohamaKanagawaJapan
- RIKEN Center for Sustainable Resource ScienceTsukubaIbarakiJapan
- Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukubaIbarakiJapan
| | - Kazuki Saito
- RIKEN Center for Sustainable Resource ScienceYokohamaKanagawaJapan
- RIKEN Center for Sustainable Resource ScienceTsukubaIbarakiJapan
- Department of Molecular Biology and BiotechnologyGraduate School of Pharmaceutical SciencesChiba UniversityChibaJapan
| | - Fuminori Takahashi
- RIKEN Center for Sustainable Resource ScienceYokohamaKanagawaJapan
- RIKEN Center for Sustainable Resource ScienceTsukubaIbarakiJapan
| | - Kazuo Shinozaki
- RIKEN Center for Sustainable Resource ScienceYokohamaKanagawaJapan
- RIKEN Center for Sustainable Resource ScienceTsukubaIbarakiJapan
| | - Kazuo Nakashima
- Biological Resources and Post‐harvest DivisionJapan International Research Center for Agricultural Sciences (JIRCAS)TsukubaIbarakiJapan
| | - Manabu Ishitani
- International Center for Tropical Agriculture (CIAT)CaliColombia
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Cao SL, Masilamany P, Li WB, Pauls KP. Agrobacterium tumefaciens-mediated transformation of corn ( Zea mays L.) multiple shoots. BIOTECHNOL BIOTEC EQ 2014; 28:208-216. [PMID: 26019506 PMCID: PMC4433900 DOI: 10.1080/13102818.2014.907654] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 07/10/2013] [Indexed: 11/07/2022] Open
Abstract
An Agrobacterium tumefaciens-mediated corn transformation method based on multiple shoot tissue cultures was developed, which is effective with a variety of corn inbred lines and standard binary vectors. Six factors that affected the success of corn transformation were tested, including A. tumefaciens strain, corn genotype, tissue culture growth stage, medium composition, co-culture temperature and surfactant treatment. Agropine-type bacteria (EHA 101 and AGL 1) were eightfold more effective than octopine-type strain for corn multi-shoot tissues transformation. The average frequency of Glucuronidase (GUS)-positive explants obtained from 14 corn genotypes ranged from 36% to 76%. L-proline (0.7 g L−1) in the co-culture medium apparently improved the frequency of transformation. The newly initiated multi-shoot tissues were most responsive to Agrobacterium infection. A positive correlation was found between multi-shoot tissue susceptibility to Agrobacterium and the proportion of cells in G1 phase. Transformants were identified by reverse transcription Polymerase Chain Reaction (PCR) and by southern blot hybridization assays. The frequency of transformants was approximately 2% based on the number of multi-shoot explants co-cultivated with Agrobacterium.
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Affiliation(s)
- Shi-Liang Cao
- Key Laboratory of Soybean Biology in Chinese Education Ministry, College of Agronomy, Northeast Agricultural University , Harbin , Heilongjiang, P.R. China
| | | | - Wen-Bin Li
- Key Laboratory of Soybean Biology in Chinese Education Ministry, College of Agronomy, Northeast Agricultural University , Harbin , Heilongjiang, P.R. China
| | - K Peter Pauls
- Department of Plant Agriculture, University of Guelph , Guelph , Ontario , Canada
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Aung MS, Masuda H, Kobayashi T, Nakanishi H, Yamakawa T, Nishizawa NK. Iron biofortification of myanmar rice. FRONTIERS IN PLANT SCIENCE 2013; 4:158. [PMID: 23750162 PMCID: PMC3664312 DOI: 10.3389/fpls.2013.00158] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 05/07/2013] [Indexed: 05/07/2023]
Abstract
Iron (Fe) deficiency elevates human mortality rates, especially in developing countries. In Myanmar, the prevalence of Fe-deficient anemia in children and pregnant women are 75 and 71%, respectively. Myanmar people have one of the highest per capita rice consumption rates globally. Consequently, production of Fe-biofortified rice would likely contribute to solving the Fe-deficiency problem in this human population. To produce Fe-biofortified Myanmar rice by transgenic methods, we first analyzed callus induction and regeneration efficiencies in 15 varieties that are presently popular because of their high-yields or high-qualities. Callus formation and regeneration efficiency in each variety was strongly influenced by types of culture media containing a range of 2,4-dichlorophenoxyacetic acid concentrations. The Paw San Yin variety, which has a high-Fe content in polished seeds, performed well in callus induction and regeneration trials. Thus, we transformed this variety using a gene expression cassette that enhanced Fe transport within rice plants through overexpression of the nicotianamine synthase gene HvNAS1, Fe flow to the endosperm through the Fe(II)-nicotianamine transporter gene OsYSL2, and Fe accumulation in endosperm by the Fe storage protein gene SoyferH2. A line with a transgene insertion was successfully obtained. Enhanced expressions of the introduced genes OsYSL2, HvNAS1, and SoyferH2 occurred in immature T2 seeds. The transformants accumulated 3.4-fold higher Fe concentrations, and also 1.3-fold higher zinc concentrations in T2 polished seeds compared to levels in non-transgenic rice. This Fe-biofortified rice has the potential to reduce Fe-deficiency anemia in millions of Myanmar people without changing food habits and without introducing additional costs.
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Affiliation(s)
- May Sann Aung
- Laboratory of Plant Biotechnology, Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- Laboratory of Plant Cell Technology, Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Hiroshi Masuda
- Laboratory of Plant Cell Technology, Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Takanori Kobayashi
- Laboratory of Plant Cell Technology, Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Hiromi Nakanishi
- Laboratory of Plant Biotechnology, Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Takashi Yamakawa
- Laboratory of Plant Biotechnology, Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Naoko K. Nishizawa
- Laboratory of Plant Biotechnology, Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- Laboratory of Plant Cell Technology, Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
- *Correspondence: Naoko K. Nishizawa, Laboratory of Plant Cell Technology, Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa 921-8836, Japan. e-mail:
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Saika H, Nonaka S, Osakabe K, Toki S. Sequential monitoring of transgene expression following Agrobacterium-mediated transformation of rice. PLANT & CELL PHYSIOLOGY 2012; 53:1974-83. [PMID: 23026817 DOI: 10.1093/pcp/pcs135] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Although Agrobacterium-mediated transformation technology is now used widely in rice, many varieties of indica-type rice are still recalcitrant to Agrobacterium-mediated transformation. It was reported recently that T-DNA integration into the rice genome could be the limiting step in this method. Here, we attempted to establish an efficient sequential monitoring system for stable transformation events by visualizing stable transgene expression using a non-destructive and highly sensitive visible marker. Our results demonstrate that click beetle luciferase (ELuc) is an excellent marker allowing the observation of transformed cells in rice callus, exhibiting a sensitivity >30-fold higher than that of firefly luciferase. Since we have previously shown that green fluorescent protein (GFP) is a useful visual marker with which to follow transient and/or stable expression of transgenes in rice, we constructed an enhancer trap vector using both the gfbsd2 (GFP fused to the N-terminus of blasticidin S deaminase) and eluc genes. In this vector, the eluc gene is under the control of the Cauliflower mosaic virus 35S minimal promoter, while the gfbsd2 gene is under the control of the full-length rice elongation factor gene promoter. Observation of transformed callus under a dissecting microscope demonstrated that the level of ELuc luminescence reflected exclusively stable transgene expression, and that both transient and stable expression could be monitored by the level of GFP fluorescence. Moreover, we show that our system enables sequential quantification of transgene expression via differential measurement of ELuc luminescence and GFP fluorescence.
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Affiliation(s)
- Hiroaki Saika
- Plant Genome Engineering Research Unit, Agrogenomics Research Center, National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602 Japan
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Fukuta Y, Konisho K, Senoo-Namai S, Yanagihara S, Tsunematsu H, Fukuo A, Kumashiro T. Genetic characterization of rainfed upland New Rice for Africa (NERICA) varieties. BREEDING SCIENCE 2012; 62:27-37. [PMID: 23136511 PMCID: PMC3405955 DOI: 10.1270/jsbbs.62.27] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Accepted: 11/21/2011] [Indexed: 05/27/2023]
Abstract
A total of 18 rainfed upland New Rice for Africa (NERICA) varieties were categorized as the heavy panicle and low tillering types and early heading, in compared with 32 different varieties. These chromosome components were clarified using 243 SSR markers which showed polymorphism among NERICA varieties and their parents, CG 14 (O. glaberrima Steud.) and one of the recurrent parents, WAB-56-104 (O. sativa L.). NERICA varieties were classified into three groups, which corresponded with these parents' continuation including two exceptions, NERICAs 14 and 17, by a cluster analysis using polymorphism data of SSR markers and 14 differential markers among them were selected to classify NERICA varieties. However, three groups: NERICAs, 3 and 4, NERICAs, 8, 9 and 11 and NERICAs, 15 and 16 were not distinguishable. Association analysis was carried out for characterization of NERICA varieties by using SSR markers genotype and phenotype of agronomic traits. A total of 131 quantitative trait loci between SSR markers and 11 agronomic traits were detected. The characteristics of early maturity and heavy panicle of upland NERICA varieties were succeeded from Asian rice varieties and the characteristics of high dry matter production and late heading were introduced from CG 14 and the other varieties.
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Affiliation(s)
- Yoshimichi Fukuta
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Kunihiko Konisho
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Sachiko Senoo-Namai
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Seiji Yanagihara
- Tropical Agricultural Research Front (TARF), JIRCAS, 1091-1 Ishigaki, Okinawa 907-0002, Japan
| | - Hiroshi Tsunematsu
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Ayumi Fukuo
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Takashi Kumashiro
- Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Owashi, Tsukuba, Ibaraki 305-8686, Japan
- Africa Rice Center (AfricaRice), 01 B.P. 2031, Cotonou, Benin
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11
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Saika H, Toki S. Mature seed-derived callus of the model indica rice variety Kasalath is highly competent in Agrobacterium-mediated transformation. PLANT CELL REPORTS 2010; 29:1351-64. [PMID: 20853107 PMCID: PMC2978894 DOI: 10.1007/s00299-010-0921-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2010] [Revised: 08/31/2010] [Accepted: 09/01/2010] [Indexed: 05/10/2023]
Abstract
We previously established an efficient Agrobacterium-mediated transformation system using primary calli derived from mature seeds of the model japonica rice variety Nipponbare. We expected that the shortened tissue culture period would reduce callus browning--a common problem with the indica transformation system during prolonged tissue culture in the undifferentiated state. In this study, we successfully applied our efficient transformation system to Kasalath--a model variety of indica rice. The Luc reporter system is sensitive enough to allow quantitative analysis of the competency of rice callus for Agrobacterium-mediated transformation. We unexpectedly discovered that primary callus of Kasalath exhibits a remarkably high competency for Agrobacterium-mediated transformation compared to Nipponbare. Southern blot analysis and Luc luminescence showed that independent transformation events in primary callus of Kasalath occurred successfully at ca. tenfold higher frequency than in Nipponbare, and single copy T-DNA integration was observed in ~40% of these events. We also compared the competency of secondary callus of Nipponbare and Kasalath and again found superior competency in Kasalath, although the identification and subsequent observation of independent transformation events in secondary callus is difficult due to the vigorous growth of both transformed and non-transformed cells. An efficient transformation system in Kasalath could facilitate the identification of QTL genes, since many QTL genes are analyzed in a Nipponbare × Kasalath genetic background. The higher transformation competency of Kasalath could be a useful trait in the establishment of highly efficient systems involving new transformation technologies such as gene targeting.
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Affiliation(s)
- Hiroaki Saika
- Plant Genetic Engineering Research Unit, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602 Japan
| | - Seiichi Toki
- Plant Genetic Engineering Research Unit, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602 Japan
- Kihara Institute for Biological Research, Yokohama City University, 641-12 Maioka-cho, Yokohama, 244-0813 Japan
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Saika H, Toki S. Visual selection allows immediate identification of transgenic rice calli efficiently accumulating transgene products. PLANT CELL REPORTS 2009; 28:619-26. [PMID: 19198844 DOI: 10.1007/s00299-009-0671-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Revised: 12/26/2008] [Accepted: 01/07/2009] [Indexed: 05/04/2023]
Abstract
In genetic transformation systems, antibiotic resistance genes are routinely used as powerful markers for selecting transformed cells from surrounding non-transformed cells. However, simultaneous use of the gene encoding green fluorescent protein (GFP) and an antibiotic resistance gene facilitates the selection process, since it allows visible selection of transformed cells. Here, we report the development of a visual selection system for transformed cells using a GFP marker without selection against antibiotics after Agrobacterium-mediated transformation in rice. Both GFP protein levels and GFP fluorescence in calli isolated by visual selection were higher than in calli selected on hygromycin (Hyg), suggesting that transgenic calli hyper-accumulating GFP were efficiently obtained by selection using GFP fluorescence itself rather than Hyg resistance. Furthermore, gfp transcripts in calli isolated by visual selection were more abundant than under Hyg selection; in contrast, transcript levels of hpt in calli selected visually were comparable to those obtained under Hyg selection. These results suggest that there was no correlation between hpt and gfp expression levels, despite the fact that they are aligned in tandem on an integrated locus after selection by either GFP fluorescence or Hyg resistance. This fact indicates that positional effects can influence the expression of each transgene differently, even when they are located in tandem at the same locus. In summary, based on our results, we discuss a model system for rice cell culture transformation for the production of recombinant proteins using visual selection.
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Affiliation(s)
- Hiroaki Saika
- Plant Genetic Engineering Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
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