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Zhai M, Ao Z, Qu H, Guo D. Overexpression of the potato VQ31 enhances salt tolerance in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2024; 15:1347861. [PMID: 38645398 PMCID: PMC11027747 DOI: 10.3389/fpls.2024.1347861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/18/2024] [Indexed: 04/23/2024]
Abstract
Plant-specific VQ proteins have crucial functions in the regulation of plant growth and development, as well as in plant abiotic stress responses. Their roles have been well established in the model plant Arabidopsis thaliana; however, the functions of the potato VQ proteins have not been adequately investigated. The VQ protein core region contains a short FxxhVQxhTG amino acid motif sequence. In this study, the VQ31 protein from potato was cloned and functionally characterized. The complete open reading frame (ORF) size of StVQ31 is 672 bp, encoding 223 amino acids. Subcellular localization analysis revealed that StVQ31 is located in the nucleus. Transgenic Arabidopsis plants overexpressing StVQ31 exhibited enhanced salt tolerance compared to wild-type (WT) plants, as evidenced by increased root length, germination rate, and chlorophyll content under salinity stress. The increased tolerance of transgenic plants was associated with increased osmotic potential (proline and soluble sugars), decreased MDA accumulation, decreased total protein content, and improved membrane integrity. These results implied that StVQ31 overexpression enhanced the osmotic potential of the plants to maintain normal cell growth. Compared to the WT, the transgenic plants exhibited a notable increase in antioxidant enzyme activities, reducing cell membrane damage. Furthermore, the real-time fluorescence quantitative PCR analysis demonstrated that StVQ31 regulated the expression of genes associated with the response to salt stress, including ERD, LEA4-5, At2g38905, and AtNCED3. These findings suggest that StVQ31 significantly impacts osmotic and antioxidant cellular homeostasis, thereby enhancing salt tolerance.
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Affiliation(s)
| | | | | | - Dongwei Guo
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
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2
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Schilling F, Schumacher C, Köhl K, Sprenger H, Kopka J, Peters R, Haas M, Zuther E, Horn R. Whole-genome sequencing of tetraploid potato varieties reveals different strategies for drought tolerance. Sci Rep 2024; 14:5476. [PMID: 38443466 PMCID: PMC10914802 DOI: 10.1038/s41598-024-55669-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 02/26/2024] [Indexed: 03/07/2024] Open
Abstract
Climate changes leading to increasingly longer seasonal drought periods in large parts of the world increase the necessity for breeding drought-tolerant crops. Cultivated potato (Solanum tuberosum), the third most important vegetable crop worldwide, is regarded as drought-sensitive due to its shallow root architecture. Two German tetraploid potato cultivars differing in drought tolerance and their F1-progeny were evaluated under various drought scenarios. Bulked segregant analyses were combined with whole-genome sequencing (BSA-Seq) using contrasting bulks of drought-tolerant and drought-sensitive F1-clones. Applying QTLseqr, 15 QTLs comprising 588,983 single nucleotide polymorphisms (SNPs) in 2325 genes associated with drought stress tolerance were identified. SeqSNP analyses in an association panel of 34 mostly starch potato varieties using 1-8 SNPs for each of 188 selected genes narrowed the number of candidate genes down to 10. In addition, ent-kaurene synthase B was the only gene present under QTL 10. Eight of the identified genes (StABP1, StBRI1, StKS, StLEA, StPKSP1, StPKSP2, StYAB5, and StZOG1) address plant development, the other three genes (StFATA, StHGD and StSYP) contribute to plant protection under drought stress. Allelic variation in these genes might be explored in future breeding for drought-tolerant potato varieties.
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Affiliation(s)
- Florian Schilling
- Department of Plant Genetics, Institute of Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Christina Schumacher
- Department of Plant Genetics, Institute of Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Karin Köhl
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Heike Sprenger
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Straße 8-10, 10589, Berlin, Germany
| | - Joachim Kopka
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Rolf Peters
- Landwirtschaftskammer Niedersachsen, Dethlingen 14, 29633, Munster, Germany
- PotatoConsult UG, Hiddinger Straße 33, 27374, Visselhövede, Germany
| | - Manuela Haas
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
- Ministry of Agriculture, Environment and Climate Protection, Henning-Von-Tresckow-Straße 2-13, 14467, Potsdam, Germany
| | - Ellen Zuther
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
- Center of Artificial Intelligence in Public Health Research, Robert Koch Institute, Nordufer 20, 13353, Berlin, Germany
| | - Renate Horn
- Department of Plant Genetics, Institute of Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany.
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3
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Qin P, Chen P, Zhou Y, Zhang W, Zhang Y, Xu J, Gan L, Liu Y, Romer J, Dörmann P, Cahoon EB, Zhang C. Vitamin E biofortification: enhancement of seed tocopherol concentrations by altered chlorophyll metabolism. FRONTIERS IN PLANT SCIENCE 2024; 15:1344095. [PMID: 38469330 PMCID: PMC10925712 DOI: 10.3389/fpls.2024.1344095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Accepted: 01/31/2024] [Indexed: 03/13/2024]
Abstract
Homogentisate Phytyltransferase (HPT) catalyzes condensation of homogentisate (HGA) and phytyl diphosphate (PDP) to produce tocopherols, but can also synthesize tocotrienols using geranylgeranyl diphosphate (GGDP) in plants engineered for deregulated HGA synthesis. In contrast to prior tocotrienol biofortification efforts, engineering enhanced tocopherol concentrations in green oilseeds has proven more challenging due to the integral role of chlorophyll metabolism in supplying the PDP substrate. This study show that RNAi suppression of CHLSYN coupled with HPT overexpression increases tocopherol concentrations by >two-fold in Arabidopsis seeds. We obtained additional increases in seed tocopherol concentrations by engineering increased HGA production via overexpression of bacterial TyrA that encodes chorismate mutase/prephenate dehydrogenase activities. In overexpression lines, seed tocopherol concentrations increased nearly three-fold, and resulted in modest tocotrienol accumulation. We further increased total tocochromanol concentrations by enhancing production of HGA and GGDP by overexpression of the gene for hydroxyphenylpyruvate dioxygenase (HPPD). This shifted metabolism towards increased amounts of tocotrienols relative to tocopherols, which was reflected in corresponding increases in ratios of GGDP/PDP in these seeds. Overall, our results provide a theoretical basis for genetic improvement of total tocopherol concentrations in green oilseeds (e.g., rapeseed, soybean) through strategies that include seed-suppression of CHLSYN coupled with increased HGA production.
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Affiliation(s)
- Ping Qin
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Peng Chen
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Yuanwei Zhou
- Yichang Academy of Agricultural Science, Ministry of Agriculture and rural areas, Yichang, Hubei, China
| | - Wei Zhang
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Yunyun Zhang
- Industrial Crops Institute of Yunnan Academy of Agricultural Sciences, Ministry of Agriculture and rural areas, Kunming, China
| | - Jingjing Xu
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Lu Gan
- Department of Biochemistry and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Yingnan Liu
- Lincang Agricultural Technology Extension Center, Lincang, Yunnan, China
| | - Jill Romer
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Bonn, Germany
| | - Peter Dörmann
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Bonn, Germany
| | - Edgar B. Cahoon
- Department of Biochemistry and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Chunyu Zhang
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
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4
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Somsri A, Chu SH, Nawade B, Lee CY, Park YJ. Harnessing γ-TMT Genetic Variations and Haplotypes for Vitamin E Diversity in the Korean Rice Collection. Antioxidants (Basel) 2024; 13:234. [PMID: 38397832 PMCID: PMC10886147 DOI: 10.3390/antiox13020234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/31/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024] Open
Abstract
Gamma-tocopherol methyltransferase (γ-TMT), a key gene in the vitamin E biosynthesis pathway, significantly influences the accumulation of tocochromanols, thereby determining rice nutritional quality. In our study, we analyzed the γ-TMT gene in 475 Korean rice accessions, uncovering 177 genetic variants, including 138 SNPs and 39 InDels. Notably, two functional SNPs, tmt-E2-28,895,665-G/A and tmt-E4-28,896,689-A/G, were identified, causing substitutions from valine to isoleucine and arginine to glycine, respectively, across 93 accessions. A positive Tajima's D value in the indica group suggests a signature of balancing selection. Haplotype analysis revealed 27 haplotypes, with two shared between cultivated and wild accessions, seven specific to cultivated accessions, and 18 unique to wild types. Further, profiling of vitamin E isomers in 240 accessions and their association with haplotypes revealed that Hap_2, distinguished by an SNP in the 3' UTR (tmt-3UTR-28,897,360-T/A) exhibited significantly lower α-tocopherol (AT), α-tocotrienol (AT3), total tocopherol, and total tocotrienol, but higher γ-tocopherol (GT) in the japonica group. Additionally, in the indica group, Hap_2 showed significantly higher AT, AT3, and total tocopherol, along with lower GT and γ-tocotrienol, compared to Hap_19, Hap_20, and Hap_21. Overall, this study highlights the genetic landscape of γ-TMT and provides a valuable genetic resource for haplotype-based breeding programs aimed at enhancing nutritional profiles.
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Affiliation(s)
- Aueangporn Somsri
- Department of Plant Resources, College of Industrial Sciences, Kongju National University, Yesan 32439, Republic of Korea; (A.S.); (S.-H.C.); (B.N.)
| | - Sang-Ho Chu
- Department of Plant Resources, College of Industrial Sciences, Kongju National University, Yesan 32439, Republic of Korea; (A.S.); (S.-H.C.); (B.N.)
| | - Bhagwat Nawade
- Department of Plant Resources, College of Industrial Sciences, Kongju National University, Yesan 32439, Republic of Korea; (A.S.); (S.-H.C.); (B.N.)
| | - Chang-Yong Lee
- Department of Industrial and Systems Engineering, College of Engineering, Kongju National University, Cheonan 31080, Republic of Korea;
| | - Yong-Jin Park
- Department of Plant Resources, College of Industrial Sciences, Kongju National University, Yesan 32439, Republic of Korea; (A.S.); (S.-H.C.); (B.N.)
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5
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Konda AR, Gelli M, Pedersen C, Cahoon RE, Zhang C, Obata T, Cahoon EB. Vitamin E biofortification: Maximizing oilseed tocotrienol and total vitamin E tocochromanol production by use of metabolic bypass combinations. Metab Eng 2023; 79:66-77. [PMID: 37429412 DOI: 10.1016/j.ymben.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/20/2023] [Accepted: 06/20/2023] [Indexed: 07/12/2023]
Abstract
Vitamin E tocochromanols are generated in plants by prenylation of homogentisate using geranylgeranyl diphosphate (GGDP) for tocotrienol biosynthesis and phytyl diphosphate (PDP) for tocopherol biosynthesis. Homogentisate geranylgeranyl transferase (HGGT), which uses GGDP for prenylation, is a proven target for oilseed tocochromanol biofortification that effectively bypasses the chlorophyll-linked pathway that limits PDP for vitamin E biosynthesis. In this report, we explored the feasibility of maximizing tocochromanol production in the oilseed crop camelina (Camelina sativa) by combining seed-specific HGGT expression with increased biosynthesis and/or reduced homogentisate catabolism. Plastid-targeted Escherichia coli TyrA-encoded chorismate mutase/prephenate dehydrogenase and Arabidopsis hydroxyphenylpyruvate dioxygenase (HPPD) cDNA were co-expressed in seeds to bypass feedback-regulated steps and increase flux into homogentisate biosynthesis. Homogentisate catabolism was also suppressed by seed-specific RNAi of the gene for homogentisate oxygenase (HGO), which initiates homogentisate degradation. In the absence of HGGT expression, tocochromanols were increased by ∼2.5-fold with HPPD/TyrA co-expression, and ∼1.4-fold with HGO suppression compared to levels in non-transformed seeds. No further increase in tocochromanols was observed in HPPD/TyrA lines with the addition of HGO RNAi. HGGT expression alone increased tocochromanol concentrations in seeds by ∼four-fold to ≤1400 μg/g seed weight. When combined with HPPD/TyrA co-expression, we obtained an additional three-fold increase in tocochromanol concentrations indicating that homogentisate concentrations limit HGGT's capacity for maximal tocochromanol production. The addition of HGO RNAi further increased tocochromanol concentrations to 5000 μg/g seed weight, an unprecedented tocochromanol concentration in an engineered oilseed. Metabolomic data obtained from engineered seeds provide insights into phenotypic changes associated with "extreme" tocochromanol production.
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Affiliation(s)
- Anji Reddy Konda
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68588 USA; USA
| | - Malleswari Gelli
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Connor Pedersen
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68588 USA; USA
| | - Rebecca E Cahoon
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68588 USA; USA
| | - Chunyu Zhang
- National Key Laboratory of Crop Genetic Improvement and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Toshihiro Obata
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68588 USA; USA
| | - Edgar B Cahoon
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68588 USA; USA.
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6
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Nguyen CX, Dohnalkova A, Hancock CN, Kirk KR, Stacey G, Stacey MG. Critical role for uricase and xanthine dehydrogenase in soybean nitrogen fixation and nodule development. THE PLANT GENOME 2023; 16:e20171. [PMID: 34904377 DOI: 10.1002/tpg2.20172] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 09/22/2021] [Indexed: 06/14/2023]
Abstract
De novo purine biosynthesis is required for the incorporation of fixed nitrogen in ureide exporting nodules, as formed on soybean [Glycine max (L.) Merr.] roots. However, in many cases, the enzymes involved in this pathway have been deduced strictly from genome annotations with little direct genetic evidence, such as mutant studies, to confirm their biochemical function or importance to nodule development. While efforts to develop large mutant collections of soybean are underway, research on this plant is still hampered by the inability to obtain mutations in any specific gene of interest. Using a forward genetic approach, as well as CRISPR/Cas9 gene editing via Agrobacterium rhizogenes-mediated hairy root transformation, we identified and characterized the role of GmUOX (Uricase) and GmXDH (Xanthine Dehydrogenase) in nitrogen fixation and nodule development in soybean. The gmuox knockout soybean mutants displayed nitrogen deficiency chlorosis and early nodule senescence, as exemplified by the reduced nitrogenase (acetylene reduction) activity in nodules, the internal greenish-white internal appearance of nodules, and diminished leghemoglobin production. In addition, gmuox1 nodules showed collapsed infected cells with degraded cytoplasm, aggregated bacteroids with no discernable symbiosome membranes, and increased formation of poly-β-hydroxybutyrate granules. Similarly, knockout gmxdh mutant nodules, generated with the CRISPR/Cas9 system, also exhibited early nodule senescence. These genetic studies confirm the critical role of the de novo purine metabolisms pathway not only in the incorporation of fixed nitrogen but also in the successful development of a functional, nitrogen-fixing nodule. Furthermore, these studies demonstrate the great utility of the CRISPR/Cas9 system for studying root-associated gene traits when coupled with hairy root transformation.
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Affiliation(s)
- Cuong X Nguyen
- Division of Plant Sciences, Univ. of Missouri, Columbia, MO, 65211, USA
| | - Alice Dohnalkova
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - C Nathan Hancock
- Dep. of Biology & Geology, Univ. of South Carolina, Aiken, SC, 29801, USA
| | - Kendall R Kirk
- Edisto Research & Education Center, Clemson Univ., Blackville, SC, 29817, USA
| | - Gary Stacey
- Division of Plant Sciences, Univ. of Missouri, Columbia, MO, 65211, USA
- Division of Biochemistry, Univ. of Missouri, Columbia, MO, 65211, USA
| | - Minviluz G Stacey
- Division of Plant Sciences, Univ. of Missouri, Columbia, MO, 65211, USA
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7
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Rahman SU, McCoy E, Raza G, Ali Z, Mansoor S, Amin I. Improvement of Soybean; A Way Forward Transition from Genetic Engineering to New Plant Breeding Technologies. Mol Biotechnol 2023; 65:162-180. [PMID: 35119645 DOI: 10.1007/s12033-022-00456-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 01/21/2022] [Indexed: 01/18/2023]
Abstract
Soybean is considered one of the important crops among legumes. Due to high nutritional contents in seed (proteins, sugars, oil, fatty acids, and amino acids), soybean is used globally for food, feed, and fuel. The primary consumption of soybean is vegetable oil and feed for chickens and livestock. Apart from this, soybean benefits soil fertility by fixing atmospheric nitrogen through root nodular bacteria. While conventional breeding is practiced for soybean improvement, with the advent of new biotechnological methods scientists have also engineered soybean to improve different traits (herbicide, insect, and disease resistance) to fulfill consumer requirements and to meet the global food deficiency. Genetic engineering (GE) techniques such as transgenesis and gene silencing help to minimize the risks and increase the adaptability of soybean. Recently, new plant breeding technologies (NPBTs) emerged such as zinc-finger nucleases, transcription activator-like effector nucleases, and Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR/Cas9), which paved the way for enhanced genetic modification of soybean. These NPBTs have the potential to improve soybean via gene functional characterization precision genome engineering for trait improvement. Importantly, these NPBTs address the ethical and public acceptance issues related to genetic modifications and transgenesis in soybean. In the present review, we summarized the improvement of soybean through GE and NPBTs. The valuable traits that have been improved through GE for different constraints have been discussed. Moreover, the traits that have been improved through NPBTs and potential targets for soybean improvements via NPBTs and solutions for ethical and public acceptance are also presented.
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Affiliation(s)
- Saleem Ur Rahman
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan
- Constituent College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
| | - Evan McCoy
- Center for Applied Genetic Technologies (CAGT), University of Georgia, Athens, USA
| | - Ghulam Raza
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan
- Constituent College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
| | - Zahir Ali
- Laboratory for Genome Engineering, Center for Desert Agriculture and Division of Biological Sciences, 4700 King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Shahid Mansoor
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan
- Constituent College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
| | - Imran Amin
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.
- Constituent College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan.
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8
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Vidya Muthulakshmi M, Srinivasan A, Srivastava S. Antioxidant Green Factories: Toward Sustainable Production of Vitamin E in Plant In Vitro Cultures. ACS OMEGA 2023; 8:3586-3605. [PMID: 36743063 PMCID: PMC9893489 DOI: 10.1021/acsomega.2c05819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 12/14/2022] [Indexed: 06/18/2023]
Abstract
Vitamin E is a dietary supplement synthesized only by photosynthetic organisms and, hence, is an essential vitamin for human well-being. Because of the ever-increasing demand for natural vitamin E and limitations in existing synthesis modes, attempts to improve its yield using plant in vitro cultures have gained traction in recent years. With inflating industrial production costs, integrative approaches to conventional bioprocess optimization is the need of the hour for multifold vitamin E productivity enhancement. In this review, we briefly discuss the structure, isomers, and important metabolic routes of biosynthesis for vitamin E in plants. We then emphasize its vital role in human health and its industrial applications and highlight the market demand and supply. We illustrate the advantages of in vitro plant cell/tissue culture cultivation as an alternative to current commercial production platforms for natural vitamin E. We touch upon the conventional vitamin E metabolic pathway engineering strategies, such as single/multigene overexpression and chloroplast engineering. We highlight the recent progress in plant systems biology to rationally identify metabolic bottlenecks and knockout targets in the vitamin E biosynthetic pathway. We then discuss bioprocess optimization strategies for sustainable vitamin E production, including media/process optimization, precursor/elicitor addition, and scale-up to bioreactors. We culminate the review with a short discussion on kinetic modeling to predict vitamin E production in plant cell cultures and suggestions on sustainable green extraction methods of vitamin E for reduced environmental impact. This review will be of interest to a wider research fraternity, including those from industry and academia working in the field of plant cell biology, plant biotechnology, and bioprocess engineering for phytochemical enhancement.
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Affiliation(s)
- M. Vidya Muthulakshmi
- Department
of Biotechnology, Bhupat & Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras (IIT Madras), Chennai, 600 036 Tamil Nadu, India
| | - Aparajitha Srinivasan
- Department
of Biotechnology, Bhupat & Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras (IIT Madras), Chennai, 600 036 Tamil Nadu, India
| | - Smita Srivastava
- Department
of Biotechnology, Bhupat & Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras (IIT Madras), Chennai, 600 036 Tamil Nadu, India
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9
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Attia AA, Sorour JM, Mohamed NA, Mansour TT, Al-Eisa RA, El-Shenawy NS. Biochemical, Histological, and Ultrastructural Studies of the Protective Role of Vitamin E on Cyclophosphamide-Induced Cardiotoxicity in Male Rats. Biomedicines 2023; 11:biomedicines11020390. [PMID: 36830928 PMCID: PMC9952974 DOI: 10.3390/biomedicines11020390] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/18/2023] [Accepted: 01/20/2023] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Cyclophosphamide (CP) (Cytoxan or Endoxan) is an efficient anti-tumor agent, widely used for the treatment of various neoplastic diseases. The study aimed to investigate the protective role of vitamin E (vit E) in improving cardiotoxicity in rats induced by CP. MATERIALS AND METHODS Forty male Wistar rats were divided randomly into four experimental groups (each consisting of ten rats); the control group was treated with saline. The other three groups were treated with vit E, CP, and the combination of vit E and CP. Serum lipid profiles, enzyme cardiac biomarkers, and cardiac tissue antioxidants were evaluated, as well as histological and ultrastructure investigations. RESULTS CP-treated rats showed a significant increase in serum levels of cardiac markers (troponin, CK, LDH, AST, and ALT), lipid profiles, a reduction in the antioxidant enzyme activities (CAT, SOD, and GPx), and an elevation in the level of lipid peroxidation (LPO). The increase in the levels of troponin, LDH, AST, ALP, and triglycerides is a predominant indicator of cardiac damage due to the toxic effect of CP. The biochemical changes parallel cardiac injuries such as myocardial infarction, myocarditis, and heart failure. Vitamin E played a pivotal role, as it attenuated most of these changes because of its ability to scavenge free radicals and reduce LPO. In addition, vit E was found to improve the histopathological alterations caused by CP where no evidence of damage was observed in the cardiac architecture, and the cardiac fibers had regained their normal structure with minimal hemorrhage. CONCLUSIONS As a result of its antioxidant activity and its stabilizing impact on the cardiomyocyte membranes, vit E is recommended as a potential candidate in decreasing the damaging effects of CP.
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Affiliation(s)
- Azza A. Attia
- Zoology Department, Faculty of Science, Alexandria University, Alexandria 21511, Egypt
| | - Jehan M. Sorour
- Zoology Department, Faculty of Science, Alexandria University, Alexandria 21511, Egypt
| | - Neama A. Mohamed
- Zoology Department, Faculty of Science, Alexandria University, Alexandria 21511, Egypt
| | - Tagreed T. Mansour
- Zoology Department, Faculty of Science, Alexandria University, Alexandria 21511, Egypt
| | - Rasha A. Al-Eisa
- Biology Department, Main Campus, College of Science, Taif University, Taif 21944, Saudi Arabia
| | - Nahla S. El-Shenawy
- Zoology Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
- Correspondence:
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10
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Niu Y, Zhang Q, Wang J, Li Y, Wang X, Bao Y. Vitamin E synthesis and response in plants. FRONTIERS IN PLANT SCIENCE 2022; 13:994058. [PMID: 36186013 PMCID: PMC9515888 DOI: 10.3389/fpls.2022.994058] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 08/15/2022] [Indexed: 06/16/2023]
Abstract
Vitamin E, also known as tocochromanol, is a lipid-soluble antioxidant that can only be produced by photosynthetic organisms in nature. Vitamin E is not only essential in human diets, but also required for plant environment adaptions. To synthesize vitamin E, specific prenyl groups needs to be incorporated with homogentisate as the first step of reaction. After decades of studies, an almost complete roadmap has been revealed for tocochromanol biosynthesis pathway. However, chlorophyll-derived prenyl precursors for synthesizing tocochromanols are still a mystery. In recent years, by employing forward genetic screening and genome-wide-association approaches, significant achievements were acquired in studying vitamin E. In this review, by summarizing the recent progresses in vitamin E, we provide to date the most updated whole view of vitamin E biosynthesis pathway. Also, we discussed about the role of vitamin E in plants stress response and its potential as signaling molecules.
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Affiliation(s)
- Yue Niu
- Shanghai Collaborative Innovation Center of Agri-Seeds, Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Qian Zhang
- Shanghai Collaborative Innovation Center of Agri-Seeds, Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Jiaojiao Wang
- Shanghai Collaborative Innovation Center of Agri-Seeds, Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Yanjie Li
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Xinhua Wang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Yan Bao
- Shanghai Collaborative Innovation Center of Agri-Seeds, Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
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11
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Dai S, Georgelis N, Bedair M, Hong Y, Qi Q, Larue CT, Sitoula B, Huang W, Krebel B, Shepard M, Su W, Kretzmer K, Dong J, Slewinski T, Berger S, Ellis C, Jerga A, Varagona M. Ectopic expression of a rice triketone dioxygenase gene confers mesotrione tolerance in soybean. PEST MANAGEMENT SCIENCE 2022; 78:2816-2827. [PMID: 35395133 PMCID: PMC9323515 DOI: 10.1002/ps.6904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 04/05/2022] [Accepted: 04/05/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Herbicide-resistant weeds pose a challenge to agriculture and food production. New herbicide tolerance traits in crops will provide farmers with more options to effectively manage weeds. Mesotrione, a selective pre- and post-emergent triketone herbicide used in corn production, controls broadleaf and some annual grass weeds via hydroxyphenylpyruvate dioxygenase (HPPD) inhibition. Recently, the rice HIS1 gene, responsible for native tolerance to the selective triketone herbicide benzobicyclon, was identified. Expression of HIS1 also confers a modest level of mesotrione resistance in rice. Here we report the use of the HIS1 gene to develop a mesotrione tolerance trait in soybean. RESULTS Conventional soybean is highly sensitive to mesotrione. Ectopic expression of a codon-optimized version of the rice HIS1 gene (TDO) in soybean confers a commercial level of mesotrione tolerance. In TDO transgenic soybean plants, mesotrione is rapidly and locally oxidized into noninhibitory metabolites in leaf tissues directly exposed to the herbicide. These metabolites are further converted into compounds similar to known classes of plant secondary metabolites. This rapid metabolism prevents movement of mesotrione from treated leaves into vulnerable emerging leaves. Minimizing the accumulation of the herbicide in vulnerable emerging leaves protects the function of HPPD and carotenoid biosynthesis more generally while providing tolerance to mesotrione. CONCLUSIONS Mesotrione has a favorable environmental and toxicological profile. The TDO-mediated soybean mesotrione tolerance trait described here provides farmers with a new option to effectively manage difficult-to-control weeds using familiar herbicide chemistry. This trait can also be adapted to other mesotrione-sensitive crops (e.g. cotton) for effective weed management. © 2022 Bayer Crop Science. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
| | | | | | | | | | | | | | - Wei Huang
- Present address:
Current address: Corteva Agriscience9330 Zionsville Road, 306/A2‐727, IndianapolisIN46268United States
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12
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Dietz N, Combs-Giroir R, Cooper G, Stacey M, Miranda C, Bilyeu K. Geographic distribution of the E1 family of genes and their effects on reproductive timing in soybean. BMC PLANT BIOLOGY 2021; 21:441. [PMID: 34587901 PMCID: PMC8480027 DOI: 10.1186/s12870-021-03197-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Soybean is an economically important crop which flowers predominantly in response to photoperiod. Several major loci controlling the quantitative trait for reproductive timing have been identified, of which allelic combinations at three of these loci, E1, E2, and E3, are the dominant factors driving time to flower and reproductive period. However, functional genomics studies have identified additional loci which affect reproductive timing, many of which are less understood. A better characterization of these genes will enable fine-tuning of adaptation to various production environments. Two such genes, E1La and E1Lb, have been implicated in flowering by previous studies, but their effects have yet to be assessed under natural photoperiod regimes. RESULTS Natural and induced variants of E1La and E1Lb were identified and introgressed into lines harboring either E1 or its early flowering variant, e1-as. Lines were evaluated for days to flower and maturity in a Maturity Group (MG) III production environment. These results revealed that variation in E1La and E1Lb promoted earlier flowering and maturity, with stronger effects in e1-as background than in an E1 background. The geographic distribution of E1La alleles among wild and cultivated soybean revealed that natural variation in E1La likely contributed to northern expansion of wild soybean, while breeding programs in North America exploited e1-as to develop cultivars adapted to northern latitudes. CONCLUSION This research identified novel alleles of the E1 paralogues, E1La and E1Lb, which promote flowering and maturity under natural photoperiods. These loci represent sources of genetic variation which have been under-utilized in North American breeding programs to control reproductive timing, and which can be valuable additions to a breeder's molecular toolbox.
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Affiliation(s)
- Nicholas Dietz
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Rachel Combs-Giroir
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Grace Cooper
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Minviluz Stacey
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Carrie Miranda
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA
| | - Kristin Bilyeu
- USDA/ARS Plant Genetics Research Unit, Columbia, MO, 65211, USA.
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13
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Hu C, Huang L, Chen Y, Liu J, Wang Z, Gao B, Zhu Q, Ren C. Fumarylacetoacetate hydrolase is required for fertility in rice. PLANTA 2021; 253:122. [PMID: 34003383 DOI: 10.1007/s00425-021-03632-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
The rice OsFAH gene functions identically to that of Arabidopsis SSCD1 encoding FAH. Loss of OsFAH causes rice sterility. Fumarylacetoacetate hydrolase (FAH) is the last enzyme in the tyrosine (Tyr) degradation pathway that is crucial for animals. By genetic analysis of the mutant of Short-day Sensitive Cell Death 1 gene encoding Arabidopsis FAH, we first found the pathway also plays a critical role in plants (Han et al., Plant Physiol 162:1956-1964, 2013). To further understand the role of the Tyr degradation pathway in plants, we investigated a biological function of the rice FAH. Firstly, the cDNA of rice FAH gene (OsFAH) was cloned and confirmed to be able to rescue the Arabidopsis Short-day Sensitive Cell Death 1 mutant defective in the FAH. Then, we identified the OsFAH T-DNA insertion mutant and generated the OsFAH RNA interference lines, and found that loss of OsFAH results in rice sterility. Furthermore, we analyzed expression of the OsFAH gene in roots, stems, leaves and young panicles at booting stage of rice and found that its transcript level was highest in young panicles and lowest in roots. In addition, the expression analysis of β-glucuronidase driven by OsFAH promoter in transgenic Arabidopsis showed that the OsFAH promoter was highly active in aerial tissues in vegetative stage, and sepals, filaments and stigma in reproductive stage. These results suggested that FAH plays an important role in rice fertility.
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Affiliation(s)
- Chao Hu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
| | - Lihua Huang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
- Crop Gene Engineering Key Laboratory of Hunan Province, Hunan Agricultural University, Changsha, 410128, China
| | - Yancheng Chen
- Key Laboratory of Indica Rice Genetics and Breeding in the Middle and Lower Reaches of Yangtze River Valley, Ministry of Agriculture, Hunan Rice Research Institute, Changsha, 410125, China
| | - Jinling Liu
- Crop Gene Engineering Key Laboratory of Hunan Province, Hunan Agricultural University, Changsha, 410128, China
| | - Zhilong Wang
- Crop Gene Engineering Key Laboratory of Hunan Province, Hunan Agricultural University, Changsha, 410128, China
| | - Bida Gao
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China
| | - Qi Zhu
- College of Horticulture and Landscape, Hunan Agricultural University, Changsha, 410128, China
| | - Chunmei Ren
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
- Crop Gene Engineering Key Laboratory of Hunan Province, Hunan Agricultural University, Changsha, 410128, China.
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14
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Burgos E, Belen De Luca M, Diouf I, de Haro LA, Albert E, Sauvage C, Tao ZJ, Bermudez L, Asís R, Nesi AN, Matringe M, Bréhélin C, Guiraud T, Ferrand C, Atienza I, Jorly J, Mauxion JP, Baldet P, Fernie AR, Quadrana L, Rothan C, Causse M, Carrari F. Validated MAGIC and GWAS population mapping reveals the link between vitamin E content and natural variation in chorismate metabolism in tomato. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:907-923. [PMID: 33179365 DOI: 10.1111/tpj.15077] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/27/2020] [Indexed: 05/21/2023]
Abstract
Tocochromanols constitute the different forms of vitamin E (VTE), essential components of the human diet, and display a high membrane protectant activity. By combining interval mapping and genome-wide association studies (GWAS), we unveiled the genetic determinants of tocochromanol accumulation in tomato (Solanum lycopersicum) fruits. To enhance the nutritional value of this highly consumed vegetable, we dissected the natural intraspecific variability of tocochromanols in tomato fruits and genetically engineered their biosynthetic pathway. These analyses allowed the identification of a total of 25 quantitative trait loci interspersed across the genome pinpointing the chorismate-tyrosine pathway as a regulatory hub controlling the supply of the aromatic head group for tocochromanol biosynthesis. To validate the link between the chorismate-tyrosine pathway and VTE, we engineered tomato plants to bypass the pathway at the arogenate branch point. Transgenic tomatoes showed moderate increments in tocopherols (up to approximately 20%) and a massive accumulation of tocotrienols (up to approximately 3400%). Gene expression analyses of these plants reveal a trade-off between VTE and natural variation in chorismate metabolism explained by transcriptional reprogramming of specific structural genes of the pathway. By restoring the accumulation of alpha-tocotrienols (α-t3) in fruits, the plants produced here are of high pharmacological and nutritional interest.
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Affiliation(s)
- Estanislao Burgos
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
| | - Maria Belen De Luca
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
| | - Isidore Diouf
- INRAE, Génétique et Amélioration des Fruits et Légumes, Centre de Recherche PACA, 67 Allée des Chênes, Domaine Saint Maurice CS60094, Montfavet, 84143, France
| | - Luis A de Haro
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
| | - Elise Albert
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | | | - Zhao J Tao
- INRAE, Génétique et Amélioration des Fruits et Légumes, Centre de Recherche PACA, 67 Allée des Chênes, Domaine Saint Maurice CS60094, Montfavet, 84143, France
| | - Luisa Bermudez
- Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria, and Consejo Nacional de Investigaciones Científicas y Técnicas, PO Box 25, Castelar, B1712WAA, Argentina
- Facultad de Agronomía, Cátedra de Genética, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ramon Asís
- CIBICI, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, CC, 5000, Argentina
| | - Adriano N Nesi
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil
| | - Michel Matringe
- Laboratoire de Physiologie Cellulaire Végétale, Unité Mixte de Recherche 5168 CNRS-CEA-INRAE, Université Joseph Fourier, CEA Grenoble, PCV, Grenoble Cedex 9, Grenoble, 38054, France
| | - Claire Bréhélin
- Laboratoire de Physiologie Cellulaire Végétale, Unité Mixte de Recherche 5168 CNRS-CEA-INRAE, Université Joseph Fourier, CEA Grenoble, PCV, Grenoble Cedex 9, Grenoble, 38054, France
| | - Thomas Guiraud
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Carine Ferrand
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Isabelle Atienza
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Joana Jorly
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Jean P Mauxion
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Pierre Baldet
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Alisdair R Fernie
- Institute of Molecular Plant Physiology, Max-Planck, Am Muehlenberg 1, Potsdam-Golm, 14476, Germany
| | - Leandro Quadrana
- Centre National de la Recherche Scientifique (CNRS), Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, Institut National de la Santé et de la Recherche Médicale (INSERM), Paris, F-75005, France
| | - Christophe Rothan
- Univ. Bordeaux, Biologie du Fruit et Pathologie, INRAE, Villenave d'OrnoF-33140, Villenave d'Ornon Cedex, UMR 1332, France
| | - Mathilde Causse
- INRAE, Génétique et Amélioration des Fruits et Légumes, Centre de Recherche PACA, 67 Allée des Chênes, Domaine Saint Maurice CS60094, Montfavet, 84143, France
| | - Fernando Carrari
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
- Facultad de Agronomía, Cátedra de Genética, Universidad de Buenos Aires, Buenos Aires, Argentina
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15
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Nguyen CX, Paddock KJ, Zhang Z, Stacey MG. GmKIX8-1 regulates organ size in soybean and is the causative gene for the major seed weight QTL qSw17-1. THE NEW PHYTOLOGIST 2021; 229:920-934. [PMID: 32939760 DOI: 10.1111/nph.16928] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 08/27/2020] [Indexed: 05/27/2023]
Abstract
Seed weight is one of the most important agronomic traits in soybean for yield improvement and food production. Several quantitative trait loci (QTLs) associated with the trait have been identified in soybean. However, the genes underlying the QTLs and their functions remain largely unknown. Using forward genetic methods and CRISPR/Cas9 gene editing, we identified and characterized the role of GmKIX8-1 in the control of organ size in soybean. GmKIX8-1 belongs to a family of KIX domain-containing proteins that negatively regulate cell proliferation in plants. Consistent with this predicted function, we found that loss-of-function GmKIX8-1 mutants showed a significant increase in the size of aerial plant organs, such as seeds and leaves. Likewise, the increase in organ size is due to increased cell proliferation, rather than cell expansion, and increased expression of CYCLIN D3;1-10. Lastly, molecular analysis of soybean germplasms harboring the qSw17-1 QTL for the big-seeded phenotype indicated that reduced expression of GmKIX8-1 is the genetic basis of the qSw17-1 phenotype.
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Affiliation(s)
- Cuong X Nguyen
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Kyle J Paddock
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Zhanyuan Zhang
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Minviluz G Stacey
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
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16
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Islam N, Krishnan HB, Natarajan S. Proteomic Profiling of Fast Neutron-Induced Soybean Mutant Unveiled Pathways Associated with Increased Seed Protein Content. J Proteome Res 2020; 19:3936-3944. [PMID: 32819100 DOI: 10.1021/acs.jproteome.0c00160] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Mutagenesis through fast neutron (FN) radiation of soybean resulted in a mutant with a 15% increase in seed protein content. A comparative genomic hybridization analysis confirmed that the mutant is lacking 24 genes located at chromosomes 5 and 10. A tandem mass tag-based proteomic profiling of the wild type and the FN mutant revealed 3,502 proteins, of which 206 proteins exhibited increased abundance and 214 proteins showed decreased abundance. Among the abundant proteins, basic 7S globulin increased fourfold, followed by vacuolar-sorting receptor and protein transporters. The differentially expressed proteins were mapped on the global metabolic pathways. It was observed that there was an enrichment of 29 ribosomal proteins, 16 endoplasmic reticular proteins, and several proteins in export metabolic pathways. The deletion of the sequence-specific DNA binding transcription factor along with 23 other genes may have altered the negative regulation of protein syntheses processes, resulting in an increase in the overall protein content of the mutant seed. This mutant is a valuable resource for researchers to understand the metabolic pathways that may affect an increase in seed protein content (the mass spectrometry data files were submitted to massive.ucsd.edu # MassIVE MSV000084228).
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Affiliation(s)
- Nazrul Islam
- Soybean Genomics and Improvement Laboratory, USDA-ARS, Beltsville, Maryland 20705, United States
| | - Hari B Krishnan
- Plant Genetics Research Unit, USDA-ARS, University of Missouri, Columbia, Missouri 65211, United States
| | - Savithiry Natarajan
- Soybean Genomics and Improvement Laboratory, USDA-ARS, Beltsville, Maryland 20705, United States
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17
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Schenck CA, Westphal J, Jayaraman D, Garcia K, Wen J, Mysore KS, Ané J, Sumner LW, Maeda HA. Role of cytosolic, tyrosine-insensitive prephenate dehydrogenase in Medicago truncatula. PLANT DIRECT 2020; 4:e00218. [PMID: 32368714 PMCID: PMC7196213 DOI: 10.1002/pld3.218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 03/21/2020] [Accepted: 03/25/2020] [Indexed: 05/26/2023]
Abstract
l-Tyrosine (Tyr) is an aromatic amino acid synthesized de novo in plants and microbes downstream of the shikimate pathway. In plants, Tyr and a Tyr pathway intermediate, 4-hydroxyphenylpyruvate (HPP), are precursors to numerous specialized metabolites, which are crucial for plant and human health. Tyr is synthesized in the plastids by a TyrA family enzyme, arogenate dehydrogenase (ADH/TyrAa), which is feedback inhibited by Tyr. Additionally, many legumes possess prephenate dehydrogenases (PDH/TyrAp), which are insensitive to Tyr and localized to the cytosol. Yet the role of PDH enzymes in legumes is currently unknown. This study isolated and characterized Tnt1-transposon mutants of MtPDH1 (pdh1) in Medicago truncatula to investigate PDH function. The pdh1 mutants lacked PDH transcript and PDH activity, and displayed little aberrant morphological phenotypes under standard growth conditions, providing genetic evidence that MtPDH1 is responsible for the PDH activity detected in M. truncatula. Though plant PDH enzymes and activity have been specifically found in legumes, nodule number and nitrogenase activity of pdh1 mutants were not significantly reduced compared with wild-type (Wt) during symbiosis with nitrogen-fixing bacteria. Although Tyr levels were not significantly different between Wt and mutants under standard conditions, when carbon flux was increased by shikimate precursor feeding, mutants accumulated significantly less Tyr than Wt. These data suggest that MtPDH1 is involved in Tyr biosynthesis when the shikimate pathway is stimulated and possibly linked to unidentified legume-specific specialized metabolism.
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Affiliation(s)
- Craig A. Schenck
- Department of BotanyUniversity of Wisconsin‐MadisonMadisonWIUSA
- Present address:
Department of Biochemistry and Molecular BiologyMichigan State UniversityEast LansingMIUSA
| | - Josh Westphal
- Department of BotanyUniversity of Wisconsin‐MadisonMadisonWIUSA
| | | | - Kevin Garcia
- Department of BacteriologyUniversity of Wisconsin‐MadisonMadisonWIUSA
- Department of Crop and Soil SciencesNorth Carolina State UniversityRaleighNCUSA
| | | | | | - Jean‐Michel Ané
- Department of BacteriologyUniversity of Wisconsin‐MadisonMadisonWIUSA
- Department of AgronomyUniversity of Wisconsin‐MadisonMadisonWIUSA
| | - Lloyd W. Sumner
- Department of BiochemistryUniversity of MissouriColumbiaMOUSA
- Metabolomics and Bond Life Sciences CentersUniversity of MissouriColumbiaMOUSA
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18
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Lin CY, Eudes A. Strategies for the production of biochemicals in bioenergy crops. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:71. [PMID: 32318116 PMCID: PMC7158082 DOI: 10.1186/s13068-020-01707-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 04/02/2020] [Indexed: 05/12/2023]
Abstract
Industrial crops are grown to produce goods for manufacturing. Rather than food and feed, they supply raw materials for making biofuels, pharmaceuticals, and specialty chemicals, as well as feedstocks for fabricating fiber, biopolymer, and construction materials. Therefore, such crops offer the potential to reduce our dependency on petrochemicals that currently serve as building blocks for manufacturing the majority of our industrial and consumer products. In this review, we are providing examples of metabolites synthesized in plants that can be used as bio-based platform chemicals for partial replacement of their petroleum-derived counterparts. Plant metabolic engineering approaches aiming at increasing the content of these metabolites in biomass are presented. In particular, we emphasize on recent advances in the manipulation of the shikimate and isoprenoid biosynthetic pathways, both of which being the source of multiple valuable compounds. Implementing and optimizing engineered metabolic pathways for accumulation of coproducts in bioenergy crops may represent a valuable option for enhancing the commercial value of biomass and attaining sustainable lignocellulosic biorefineries.
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Affiliation(s)
- Chien-Yuan Lin
- Joint BioEnergy Institute, Emeryville, CA 94608 USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA
| | - Aymerick Eudes
- Joint BioEnergy Institute, Emeryville, CA 94608 USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA
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19
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Xu JJ, Fang X, Li CY, Yang L, Chen XY. General and specialized tyrosine metabolism pathways in plants. ABIOTECH 2020; 1:97-105. [PMID: 36304719 PMCID: PMC9590561 DOI: 10.1007/s42994-019-00006-w] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 08/06/2019] [Indexed: 11/25/2022]
Abstract
The tyrosine metabolism pathway serves as a starting point for the production of a variety of structurally diverse natural compounds in plants, such as tocopherols, plastoquinone, ubiquinone, betalains, salidroside, benzylisoquinoline alkaloids, and so on. Among these, tyrosine-derived metabolites, tocopherols, plastoquinone, and ubiquinone are essential to plant survival. In addition, this pathway provides us essential micronutrients (e.g., vitamin E and ubiquinone) and medicine (e.g., morphine, salidroside, and salvianolic acid B). However, our knowledge of the plant tyrosine metabolism pathway remains rudimentary, and genes encoding the pathway enzymes have not been fully defined. In this review, we summarize and discuss recent advances in the tyrosine metabolism pathway, key enzymes, and important tyrosine-derived metabolites in plants.
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Affiliation(s)
- Jing-Jing Xu
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Plant Science Research Center, Shanghai Chenshan Botanical Garden, Shanghai, 201602 People’s Republic of China
| | - Xin Fang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences Kunming, Kunming, 650201 Yunnan People’s Republic of China
| | - Chen-Yi Li
- State Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences/Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200032 People’s Republic of China
- University of Chinese Academy of Sciences, Shanghai, 200032 People’s Republic of China
| | - Lei Yang
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Plant Science Research Center, Shanghai Chenshan Botanical Garden, Shanghai, 201602 People’s Republic of China
| | - Xiao-Ya Chen
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Plant Science Research Center, Shanghai Chenshan Botanical Garden, Shanghai, 201602 People’s Republic of China
- State Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences/Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200032 People’s Republic of China
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20
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Kambhampati S, Aznar-Moreno JA, Hostetler C, Caso T, Bailey SR, Hubbard AH, Durrett TP, Allen DK. On the Inverse Correlation of Protein and Oil: Examining the Effects of Altered Central Carbon Metabolism on Seed Composition Using Soybean Fast Neutron Mutants. Metabolites 2019; 10:E18. [PMID: 31905618 PMCID: PMC7022410 DOI: 10.3390/metabo10010018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 12/21/2019] [Accepted: 12/21/2019] [Indexed: 12/11/2022] Open
Abstract
Protein and oil levels measured at maturity are inversely correlated across soybean lines; however, carbon is in limited supply during maturation resulting in tradeoffs for the production of other reserves including oligosaccharides. During the late stages of seed development, the allocation of carbon for storage reserves changes. Lipid and protein levels decline while concentrations of indigestible raffinose family oligosaccharides (RFOs) increase, leading to a decreased crop value. Since the maternal source of carbon is diminished during seed maturation stages of development, carbon supplied to RFO synthesis likely comes from an internal, turned-over source and may contribute to the reduction in protein and lipid content in mature seeds. In this study, fast neutron (FN) mutagenized soybean populations with deletions in central carbon metabolic genes were examined for trends in oil, protein, sugar, and RFO accumulation leading to an altered final composition. Two lines with concurrent increases in oil and protein, by combined 10%, were identified. A delayed switch in carbon allocation towards RFO biosynthesis resulted in extended lipid accumulation and without compromising protein. Strategies for future soybean improvement using FN resources are described.
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Affiliation(s)
- Shrikaar Kambhampati
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (S.K.); (C.H.); (T.C.); (A.H.H.)
| | - Jose A. Aznar-Moreno
- Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, KS 66506, USA;
| | - Cooper Hostetler
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (S.K.); (C.H.); (T.C.); (A.H.H.)
| | - Tara Caso
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (S.K.); (C.H.); (T.C.); (A.H.H.)
| | - Sally R. Bailey
- United States Department of Agriculture, Agricultural Research Service, St. Louis, MO 63132, USA;
| | - Allen H. Hubbard
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (S.K.); (C.H.); (T.C.); (A.H.H.)
| | - Timothy P. Durrett
- Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, KS 66506, USA;
| | - Doug K. Allen
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (S.K.); (C.H.); (T.C.); (A.H.H.)
- United States Department of Agriculture, Agricultural Research Service, St. Louis, MO 63132, USA;
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21
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Prenger EM, Ostezan A, Mian MAR, Stupar RM, Glenn T, Li Z. Identification and characterization of a fast-neutron-induced mutant with elevated seed protein content in soybean. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:2965-2983. [PMID: 31324928 DOI: 10.1007/s00122-019-03399-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
KEY MESSAGE Protein content of soybean is critical for utility of soybean meal. A fast-neutron-induced deletion on chromosome 12 was found to be associated with increased protein content. Soybean seed composition affects the utility of soybean, and improving seed composition is an essential breeding goal. Fast neutron radiation introduces genomic mutations resulting in novel variation for traits of interest. Two elite soybean lines were irradiated with fast neutrons and screened for altered seed composition. Twenty-three lines with altered protein, oil, or sucrose content were selected based on near-infrared spectroscopy data from five environments and yield tested at five locations. Mutants with significantly increased protein averaged 19.1-36.8 g kg-1 more protein than the parents across 10 environments. Comparative genomic hybridization (CGH) identified putative mutations in a mutant, G15FN-12, that has 36.8 g kg-1 higher protein than the parent genotype, and whole genome sequencing (WGS) of the mutant has confirmed these mutations. An F2:3 population was developed from G15FN-12 to determine association between genomic changes and increased protein content. Bulked segregant analysis of the population using the SoySNP50K BeadChip identified a CGH- and WGS-confirmed deletion on chromosome 12 to be responsible for elevated protein content. The population was genotyped using a KASP marker designed at the mutation region, and significant association (P < 0.0001) between the deletion on chromosome 12 and elevated protein content was observed and confirmed in the F3:4 generation. The F2 segregants homozygous for the deletion averaged 27 g kg-1 higher seed protein and 8 g kg-1 lower oil than homozygous wild-type segregants. Mutants with altered seed composition are a new resource for gene function studies and provide elite materials for genetic improvement of seed composition.
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Affiliation(s)
- Elizabeth M Prenger
- Department of Crop and Soil Sciences and Institute of Plant Breeding, Genetics, and Genomics, University of Georgia, Athens, GA, 30602, USA
| | - Alexandra Ostezan
- Department of Crop and Soil Sciences and Institute of Plant Breeding, Genetics, and Genomics, University of Georgia, Athens, GA, 30602, USA
| | - M A Rouf Mian
- Soybean and Nitrogen Fixation Research Unit, USDA-ARS, Raleigh, NC, 27607, USA
| | - Robert M Stupar
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA
| | - Travis Glenn
- Deparment of Genetics, University of Georgia, Athens, GA, 30602, USA
| | - Zenglu Li
- Department of Crop and Soil Sciences and Institute of Plant Breeding, Genetics, and Genomics, University of Georgia, Athens, GA, 30602, USA.
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22
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Munir N, Cheng C, Xia C, Xu X, Nawaz MA, Iftikhar J, Chen Y, Lin Y, Lai Z. RNA-Seq analysis reveals an essential role of tyrosine metabolism pathway in response to root-rot infection in Gerbera hybrida. PLoS One 2019; 14:e0223519. [PMID: 31644543 PMCID: PMC6808435 DOI: 10.1371/journal.pone.0223519] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 09/23/2019] [Indexed: 02/07/2023] Open
Abstract
Gerbera hybrida is one of the top five cut flowers across the world, it is host for the root rot causing parasite called Phytophthora cryptogea. In this study, plantlets of healthy and root-rot pathogen-infected G. hybrida were used as plant materials for transcriptome analyis using high-throughput Illumina sequencing technique. A total 108,135 unigenes were generated with an average length of 727 nt and N50 equal to 1274 nt out of which 611 genes were identified as DEGs by DESeq analyses. Among DEGs, 228 genes were up-regulated and 383 were down-regulated. Through this annotated data and Kyoto encyclopedia of genes and genomes (KEGG), molecular interaction network, transcripts accompanying with tyrosine metabolism, phenylalanine, tyrosine, and tryptophan biosynthesis, phenylpropanoid and flavonoid biosynthesis, and plant hormone signal transduction pathways were thoroughly observed considering expression pattern. The involvement of DEGs in tyrosine metabolism pathway was validated by real-time qPCR. We found that genes related with tyrosine metabolism were activated and up-regulated against stress response. The expression of GhTAT, GhAAT, GhHPD, GhHGD and GhFAH genes was significantly increased in the leaves and petioles at four and six dpi (days post inoculation) as compared with control. The study predicts the gene sequences responsible for the tyrosine metabolism pathway and its responses against root-rot resistance in gerbera plant. In future, identification of such genes is necessary for the better understanding of rot resistance mechanism and to develop a root rot resistance strategy for ornamental plants.
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Affiliation(s)
- Nigarish Munir
- Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Chunzhen Cheng
- Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Chaoshui Xia
- Sanming Academy of Agricultural Sciences, Sanming, Fujian, China
| | - Xuming Xu
- Sanming Academy of Agricultural Sciences, Sanming, Fujian, China
| | - Muhammad Azher Nawaz
- Department of Horticulture, College of Agriculture, University of Sargodha, Sargodha, Pakistan
| | - Junaid Iftikhar
- Fujian Provincial Key Labortary of Plant Functional Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yukun Chen
- Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuling Lin
- Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhongxiong Lai
- Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
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23
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Campbell BW, Hoyle JW, Bucciarelli B, Stec AO, Samac DA, Parrott WA, Stupar RM. Functional analysis and development of a CRISPR/Cas9 allelic series for a CPR5 ortholog necessary for proper growth of soybean trichomes. Sci Rep 2019; 9:14757. [PMID: 31611562 PMCID: PMC6791840 DOI: 10.1038/s41598-019-51240-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 09/27/2019] [Indexed: 11/19/2022] Open
Abstract
Developments in genomic and genome editing technologies have facilitated the mapping, cloning, and validation of genetic variants underlying trait variation. This study combined bulked-segregant analysis, array comparative genomic hybridization, and CRISPR/Cas9 methodologies to identify a CPR5 ortholog essential for proper trichome growth in soybean (Glycine max). A fast neutron mutant line exhibited short trichomes with smaller trichome nuclei compared to its parent line. A fast neutron-induced deletion was identified within an interval on chromosome 6 that co-segregated with the trichome phenotype. The deletion encompassed six gene models including an ortholog of Arabidopsis thaliana CPR5. CRISPR/Cas9 was used to mutate the CPR5 ortholog, resulting in five plants harboring a total of four different putative knockout alleles and two in-frame alleles. Phenotypic analysis of the mutants validated the candidate gene, and included intermediate phenotypes that co-segregated with the in-frame alleles. These findings demonstrate that the CPR5 ortholog is essential for proper growth and development of soybean trichomes, similar to observations in A. thaliana. Furthermore, this work demonstrates the value of using CRISPR/Cas9 to generate an allelic series and intermediate phenotypes for functional analysis of candidate genes and/or the development of novel traits.
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Affiliation(s)
- Benjamin W Campbell
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA.
| | - Jacob W Hoyle
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA, USA
| | - Bruna Bucciarelli
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
- USDA-ARS-Plant Science Research Unit, St. Paul, MN, USA
| | - Adrian O Stec
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
| | - Deborah A Samac
- USDA-ARS-Plant Science Research Unit, St. Paul, MN, USA
- Department of Plant Pathology, University of Minnesota, St. Paul, MN, USA
| | - Wayne A Parrott
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA, USA
| | - Robert M Stupar
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA.
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24
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Islam N, Stupar RM, Qijian S, Luthria DL, Garrett W, Stec AO, Roessler J, Natarajan SS. Genomic changes and biochemical alterations of seed protein and oil content in a subset of fast neutron induced soybean mutants. BMC PLANT BIOLOGY 2019; 19:420. [PMID: 31604426 PMCID: PMC6790046 DOI: 10.1186/s12870-019-1981-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 08/19/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Soybean is subjected to genetic manipulation by breeding, mutation, and transgenic approaches to produce value-added quality traits. Among those genetic approaches, mutagenesis through fast neutrons radiation is intriguing because it yields a variety of mutations, including single/multiple gene deletions and/or duplications. Characterizing the seed composition of the fast neutron mutants and its relationship with gene mutation is useful towards understanding oil and protein traits in soybean. RESULTS From a large population of fast neutron mutagenized plants, we selected ten mutants based on a screening of total oil and protein content using near infra-red spectroscopy. These ten mutants were regrown, and the seeds were analyzed for oil by GC-MS, protein profiling by SDS-PAGE and gene mapping by comparative genomic hybridization. The mutant 2R29C14Cladecr233cMN15 (nicknamed in this study as L10) showed higher protein and lower oil content compared to the wild type, followed by three other lines (nicknamed in this study as L03, L05, and L06). We characterized the fatty acid methyl esters profile of the trans-esterified oil and found the presence of five major fatty acids (palmitic, stearic, oleic, linoleic, and linolenic acids) at varying proportions among the mutants. Protein profile using SDS-PAGE of the ten mutants did exhibit discernable variation between storage (glycinin and β-conglycinin) and anti-nutritional factor (trypsin inhibitor) proteins. In addition, we physically mapped the position of the gene deletions or duplications in each mutant using comparative genomic hybridization. CONCLUSION Characterization of oil and protein profile in soybean fast neutron mutants will assist scientist and breeders to develop new value-added soybeans with improved protein and oil quality traits.
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Affiliation(s)
- Nazrul Islam
- Soybean Genomics and Improvement Laboratory, USDA-ARS, NEA, 10300, Baltimore Avenue, Beltsville, MD, USA
| | - Robert M Stupar
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
| | - Song Qijian
- Soybean Genomics and Improvement Laboratory, USDA-ARS, NEA, 10300, Baltimore Avenue, Beltsville, MD, USA
| | - Devanand L Luthria
- Food Composition and Methods Development Laboratory, USDA-ARS, NEA, Beltsville, MD, USA
| | - Wesley Garrett
- Animal Biosciences & Biotechnology Laboratory, USDA-ARS, NEA, Beltsville, MD, USA
| | - Adrian O Stec
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
| | - Jeff Roessler
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
| | - Savithiry S Natarajan
- Soybean Genomics and Improvement Laboratory, USDA-ARS, NEA, 10300, Baltimore Avenue, Beltsville, MD, USA.
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25
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Wang M, Toda K, Block A, Maeda HA. TAT1 and TAT2 tyrosine aminotransferases have both distinct and shared functions in tyrosine metabolism and degradation in Arabidopsis thaliana. J Biol Chem 2019; 294:3563-3576. [PMID: 30630953 PMCID: PMC6416433 DOI: 10.1074/jbc.ra118.006539] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 01/08/2019] [Indexed: 12/18/2022] Open
Abstract
Plants produce various l-tyrosine (Tyr)-derived compounds that are critical for plant adaptation and have pharmaceutical or nutritional importance for human health. Tyrosine aminotransferases (TATs) catalyze the reversible reaction between Tyr and 4-hydroxyphenylpyruvate (HPP), representing the entry point in plants for both biosynthesis of various natural products and Tyr degradation in the recycling of energy and nutrients. To better understand the roles of TATs and how Tyr is metabolized in planta, here we characterized single and double loss-of-function mutants of TAT1 (At5g53970) and TAT2 (At5g36160) in the model plant Arabidopsis thaliana As reported previously, tat1 mutants exhibited elevated and decreased levels of Tyr and tocopherols, respectively. The tat2 mutation alone had no impact on Tyr and tocopherol levels, but a tat1 tat2 double mutant had increased Tyr accumulation and decreased tocopherol levels under high-light stress compared with the tat1 mutant. Relative to WT and the tat2 mutant, the tat1 mutant displayed increased vulnerability to continuous dark treatment, associated with an early drop in respiratory activity and sucrose depletion. During isotope-labeled Tyr feeding in the dark, we observed that the tat1 mutant exhibits much slower 13C incorporation into tocopherols, fumarate, and other tricarboxylic acid (TCA) cycle intermediates than WT and the tat2 mutant. These results indicate that TAT1 and TAT2 function together in tocopherol biosynthesis, with TAT2 having a lesser role, and that TAT1 plays the major role in Tyr degradation in planta Our study also highlights the importance of Tyr degradation under carbon starvation conditions during dark-induced senescence in plants.
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Affiliation(s)
- Minmin Wang
- From the Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin 53706
- the Department of Biochemistry, University of Missouri, Columbia, Missouri 65211
| | - Kyoko Toda
- From the Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin 53706
- the Institute of Crop Science, National Agriculture and Food Research Organization (NARO), 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8518, Japan
| | - Anna Block
- the Center for Medical, Agricultural, and Veterinary Entomology, Agricultural Research Service, United States Department of Agriculture, Gainesville, Florida 32608, and
| | - Hiroshi A Maeda
- From the Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin 53706,
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26
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Abstract
Phytol, the prenyl side chain of chlorophyll, is derived from geranylgeraniol by reduction of three double bonds. Recent results demonstrated that the conversion of geranylgeraniol to phytol is linked to chlorophyll synthesis, which is catalyzed by protein complexes associated with the thylakoid membranes. One of these complexes contains light harvesting chlorophyll binding like proteins (LIL3), enzymes of chlorophyll synthesis (protoporphyrinogen oxidoreductase, POR; chlorophyll synthase, CHLG) and geranylgeranyl reductase (GGR). Phytol is not only employed for the synthesis of chlorophyll, but also for tocopherol (vitamin E), phylloquinol (vitamin K) and fatty acid phytyl ester production. Previously, it was believed that phytol is derived from reduction of geranylgeranyl-diphosphate originating from the 4-methylerythritol-5-phosphate (MEP) pathway. The identification and characterization of two kinases, VTE5 and VTE6, involved in phytol and phytyl-phosphate phosphorylation, respectively, indicated that most phytol employed for tocopherol synthesis is derived from reduction of geranylgeranylated chlorophyll to (phytol-) chlorophyll. After hydrolysis from chlorophyll, free phytol is phosphorylated by the two kinases, and phytyl-diphosphate employed for the synthesis of tocopherol and phylloquinol. The reason why some chloroplast lipids, i.e. chlorophyll, tocopherol and phylloquinol, are derived from phytol, while others, i.e. carotenoids and tocotrienols (in some plant species) are synthesized from geranylgeraniol, remains unclear.
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27
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Siles L, Alegre L, González-Solís A, Cahoon EB, Munné-Bosch S. Transcriptional Regulation of Vitamin E Biosynthesis during Germination of Dwarf Fan Palm Seeds. PLANT & CELL PHYSIOLOGY 2018; 59:2490-2501. [PMID: 30137562 DOI: 10.1093/pcp/pcy170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 08/11/2018] [Indexed: 06/08/2023]
Abstract
Vitamin E, a potent antioxidant either presents in the form of tocopherols and/or tocotrienols depending on the plant species, tissue and developmental stage, plays a major role in protecting lipids from oxidation in seeds. Unlike tocopherols, which have a more universal distribution, the occurrence of tocotrienols is limited primarily to monocot seeds. Dwarf fan palm (Chamaerops humilis var. humilis) seeds accumulate tocotrienols in quiescent and dormant seeds, while tocopherols are de novo synthesized during germination. Here, we aimed to elucidate whether tocopherol biosynthesis is regulated at the transcriptional level during germination in this species. We identified and quantified the expression levels of five genes involved in vitamin E biosynthesis, including TYROSINE AMINOTRANSFERASE (ChTAT), HOMOGENTISATE PHYTYLTRANSFERASE (ChHPT), HOMOGENTISATE GERANYLGERANYL TRANSFERASE (ChHGGT), TOCOPHEROL CYCLASE (ChTC) and TOCOPHEROL γ-METHYLTRANSFERASE (Chγ-TMT). Furthermore, we evaluated to what extent variations in the endogenous contents of hormones and hydrogen peroxide (H2O2) correlated with transcriptional regulation. Results showed an increase of ChTAT and ChHPT levels during seed germination, which correlated with an increase of jasmonic acid (JA), gibberellin4 (GA4), and H2O2 contents, while ChHGGT and Chγ-TMT expression levels decreased, thus clearly indicating vitamin E biosynthesis is diverted to tocopherols rather than to tocotrienols. Exogenous application of jasmonic acid increased tocopherol, but not tocotrienol content, thus confirming its regulatory role in vitamin E biosynthesis during seed germination. It is concluded that the biosynthesis of vitamin E is regulated at the transcriptional level during germination in dwarf fan palm seeds, with ChHPT playing a key role in the diversion of the vitamin E pathway towards tocopherols instead of tocotrienols.
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Affiliation(s)
- Laura Siles
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Leonor Alegre
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Ariadna González-Solís
- Center for Plant Science Innovation and Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Edgar B Cahoon
- Center for Plant Science Innovation and Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Sergi Munné-Bosch
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
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28
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Schenck CA, Maeda HA. Tyrosine biosynthesis, metabolism, and catabolism in plants. PHYTOCHEMISTRY 2018; 149:82-102. [PMID: 29477627 DOI: 10.1016/j.phytochem.2018.02.003] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 01/26/2018] [Accepted: 02/02/2018] [Indexed: 05/22/2023]
Abstract
L-Tyrosine (Tyr) is an aromatic amino acid (AAA) required for protein synthesis in all organisms, but synthesized de novo only in plants and microorganisms. In plants, Tyr also serves as a precursor of numerous specialized metabolites that have diverse physiological roles as electron carriers, antioxidants, attractants, and defense compounds. Some of these Tyr-derived plant natural products are also used in human medicine and nutrition (e.g. morphine and vitamin E). While the Tyr biosynthesis and catabolic pathways have been extensively studied in microbes and animals, respectively, those of plants have received much less attention until recently. Accumulating evidence suggest that the Tyr biosynthetic pathways differ between microbes and plants and even within the plant kingdom, likely to support the production of lineage-specific plant specialized metabolites derived from Tyr. The interspecies variations of plant Tyr pathway enzymes can now be used to enhance the production of Tyr and Tyr-derived compounds in plants and other synthetic biology platforms.
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Affiliation(s)
- Craig A Schenck
- Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Hiroshi A Maeda
- Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA.
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29
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Pellaud S, Bory A, Chabert V, Romanens J, Chaisse-Leal L, Doan AV, Frey L, Gust A, Fromm KM, Mène-Saffrané L. WRINKLED1 and ACYL-COA:DIACYLGLYCEROL ACYLTRANSFERASE1 regulate tocochromanol metabolism in Arabidopsis. THE NEW PHYTOLOGIST 2018; 217:245-260. [PMID: 29105089 DOI: 10.1111/nph.14856] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 09/19/2017] [Indexed: 05/08/2023]
Abstract
Photosynthetic organisms such as plants, algae and some cyanobacteria synthesize tocochromanols, a group of compounds that encompasses tocopherols and tocotrienols and that exhibits vitamin E activity in animals. While most vitamin E biosynthetic genes have been identified in plant genomes, regulatory genes controlling tocopherol accumulation are currently unknown. We isolated by forward genetics Arabidopsis enhanced vitamin E (eve) mutants that overaccumulate the classic tocopherols and plastochromanol-8, and a tocochromanol unknown in this species. We mapped eve1 and eve4, and identified the unknown Arabidopsis tocochromanol by using a combination of analytical tools. In addition, we determined its biosynthetic pathway with a series of tocochromanol biosynthetic mutants and transgenic lines. eve1 and eve4 are two seed lipid mutants affecting the WRINKLED1 (WRI1) and ACYL-COA:DIACYLGLYCEROL ACYLTRANSFERASE1 (DGAT1) genes, respectively. The unknown tocochromanol is 11'-12' γ-tocomonoenol, whose biosynthesis is VITAMIN E 1 (VTE1) - and VTE2-dependent and is initiated by the condensation of homogentisate (HGA) and tetrahydrogeranylgeranyl pyrophosphate. This study identifies the first two regulatory genes, WRI1 and DGAT1, that control the synthesis of all tocochromanol forms in seeds, and shows the existence of a metabolic trade-off between lipid and tocochromanol metabolisms. Moreover, it shows that Arabidopsis possesses a tocomonoenol biosynthetic pathway that competes with tocopherol synthesis.
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Affiliation(s)
- Sébastien Pellaud
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Alexandre Bory
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Valentin Chabert
- Department of Chemistry, University of Fribourg, Chemin du musée, 9, CH-1700, Fribourg, Switzerland
| | - Joëlle Romanens
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Laurie Chaisse-Leal
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Anh Vu Doan
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Lucas Frey
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Andrea Gust
- Department of Plant Biochemistry, ZMBP - Center for Plant Molecular Biology, University of Tübingen, Auf der Morgenstelle 32, D-72076, Tübingen, Germany
| | - Katharina M Fromm
- Department of Chemistry, University of Fribourg, Chemin du musée, 9, CH-1700, Fribourg, Switzerland
| | - Laurent Mène-Saffrané
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
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30
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Mène-Saffrané L. Vitamin E Biosynthesis and Its Regulation in Plants. Antioxidants (Basel) 2017; 7:E2. [PMID: 29295607 PMCID: PMC5789312 DOI: 10.3390/antiox7010002] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Revised: 12/19/2017] [Accepted: 12/21/2017] [Indexed: 12/17/2022] Open
Abstract
Vitamin E is one of the 13 vitamins that are essential to animals that do not produce them. To date, six natural organic compounds belonging to the chemical family of tocochromanols-four tocopherols and two tocotrienols-have been demonstrated as exhibiting vitamin E activity in animals. Edible plant-derived products, notably seed oils, are the main sources of vitamin E in the human diet. Although this vitamin is readily available, independent nutritional surveys have shown that human populations do not consume enough vitamin E, and suffer from mild to severe deficiency. Tocochromanols are mostly produced by plants, algae, and some cyanobacteria. Tocochromanol metabolism has been mainly studied in higher plants that produce tocopherols, tocotrienols, plastochromanol-8, and tocomonoenols. In contrast to the tocochromanol biosynthetic pathways that are well characterized, our understanding of the physiological and molecular mechanisms regulating tocochromanol biosynthesis is in its infancy. Although it is known that tocochromanol biosynthesis is strongly conditioned by the availability in homogentisate and polyprenyl pyrophosphate, its polar and lipophilic biosynthetic precursors, respectively, the mechanisms regulating their biosyntheses are barely known. This review summarizes our current knowledge of tocochromanol biosynthesis in plants, and highlights future challenges regarding the understanding of its regulation.
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Affiliation(s)
- Laurent Mène-Saffrané
- Department of Biology, University of Fribourg, Chemin du Musée, 10, 1700 Fribourg, Switzerland.
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31
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Martin C, Li J. Medicine is not health care, food is health care: plant metabolic engineering, diet and human health. THE NEW PHYTOLOGIST 2017; 216:699-719. [PMID: 28796289 DOI: 10.1111/nph.14730] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 06/23/2017] [Indexed: 05/03/2023]
Abstract
Contents 699 I. 699 II. 700 III. 700 IV. 706 V. 707 VI. 714 714 References 714 SUMMARY: Plants make substantial contributions to our health through our diets, providing macronutrients for energy and growth as well as essential vitamins and phytonutrients that protect us from chronic diseases. Imbalances in our food can lead to deficiency diseases or obesity and associated metabolic disorders, increased risk of cardiovascular diseases and cancer. Nutritional security is now a global challenge which can be addressed, at least in part, through plant metabolic engineering for nutritional improvement of foods that are accessible to and eaten by many. We review the progress that has been made in nutritional enhancement of foods, both improvements through breeding and through biotechnology and the engineering principles on which increased phytonutrient levels are based. We also consider the evidence, where available, that such foods do enhance health and protect against chronic diseases.
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Affiliation(s)
- Cathie Martin
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Jie Li
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
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Nogueira M, Enfissi EM, Almeida J, Fraser PD. Creating plant molecular factories for industrial and nutritional isoprenoid production. Curr Opin Biotechnol 2017; 49:80-87. [PMID: 28837945 DOI: 10.1016/j.copbio.2017.08.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/30/2017] [Accepted: 08/03/2017] [Indexed: 11/26/2022]
Abstract
Chemical refining is a highly efficient process that has driven industrialisation and globalisation. However, dwindling fuel reserves and climatic fluctuation are now imposing key societal and economic challenges to health and welfare provision, agriculture, manufacturing outputs and energy. Plants are potentially exploitable 'green' chemical factories, with vast chemical diversity that can be used for the discovery and production of food, feed, medicines and biomaterials. Despite notable advances, plant based production under real-life scenarios remains, in most cases, economically uncompetitive when compared to inherently non-sustainable petrochemical based processes. In the present review the strategies available and those emerging will be described. Furthermore, how can the new evolving molecular tools such as genome editing be utilised to create a new paradigm of plant-based production? To illustrate the present status quo, we have chosen the isoprenoids as the class of natural products. These compounds display vast chemical diversity and have been used across multiple industrial sectors as medicines, supplements in food and feedstuffs, colourants and fragrances.
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Affiliation(s)
- Marilise Nogueira
- School of Biological Sciences, Royal Holloway University of London, Egham Hill, Egham, Surrey TW20 ORB, UK
| | - Eugenia Ma Enfissi
- School of Biological Sciences, Royal Holloway University of London, Egham Hill, Egham, Surrey TW20 ORB, UK
| | - Juliana Almeida
- School of Biological Sciences, Royal Holloway University of London, Egham Hill, Egham, Surrey TW20 ORB, UK
| | - Paul D Fraser
- School of Biological Sciences, Royal Holloway University of London, Egham Hill, Egham, Surrey TW20 ORB, UK.
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Dobbels AA, Michno JM, Campbell BW, Virdi KS, Stec AO, Muehlbauer GJ, Naeve SL, Stupar RM. An Induced Chromosomal Translocation in Soybean Disrupts a KASI Ortholog and Is Associated with a High-Sucrose and Low-Oil Seed Phenotype. G3 (BETHESDA, MD.) 2017; 7:1215-1223. [PMID: 28235823 PMCID: PMC5386870 DOI: 10.1534/g3.116.038596] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 02/11/2017] [Indexed: 12/15/2022]
Abstract
Mutagenesis is a useful tool in many crop species to induce heritable genetic variability for trait improvement and gene discovery. In this study, forward screening of a soybean fast neutron (FN) mutant population identified an individual that produced seed with nearly twice the amount of sucrose (8.1% on dry matter basis) and less than half the amount of oil (8.5% on dry matter basis) as compared to wild type. Bulked segregant analysis (BSA), comparative genomic hybridization, and genome resequencing were used to associate the seed composition phenotype with a reciprocal translocation between chromosomes 8 and 13. In a backcross population, the translocation perfectly cosegregated with the seed composition phenotype and exhibited non-Mendelian segregation patterns. We hypothesize that the translocation is responsible for the altered seed composition by disrupting a β-ketoacyl-[acyl carrier protein] synthase 1 (KASI) ortholog. KASI is a core fatty acid synthesis enzyme that is involved in the conversion of sucrose into oil in developing seeds. This finding may lead to new research directions for developing soybean cultivars with modified carbohydrate and oil seed composition.
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Affiliation(s)
- Austin A Dobbels
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Jean-Michel Michno
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Benjamin W Campbell
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Kamaldeep S Virdi
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Adrian O Stec
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Gary J Muehlbauer
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
- Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108
| | - Seth L Naeve
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
| | - Robert M Stupar
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
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Mène-Saffrané L, Pellaud S. Current strategies for vitamin E biofortification of crops. Curr Opin Biotechnol 2017; 44:189-197. [DOI: 10.1016/j.copbio.2017.01.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 01/11/2017] [Accepted: 01/12/2017] [Indexed: 01/23/2023]
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Pellaud S, Mène-Saffrané L. Metabolic Origins and Transport of Vitamin E Biosynthetic Precursors. FRONTIERS IN PLANT SCIENCE 2017; 8:1959. [PMID: 29184568 PMCID: PMC5694494 DOI: 10.3389/fpls.2017.01959] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 10/31/2017] [Indexed: 05/21/2023]
Abstract
Tocochromanols are organic compounds mostly produced by photosynthetic organisms that exhibit vitamin E activity in animals. They result from the condensation of homogentisate with four different polyprenyl side chains derived all from geranylgeranyl pyrophosphate. The core tocochromanol biosynthesis has been investigated in several photosynthetic organisms and is now well-characterized. In contrast, our current knowledge of the biosynthesis and transport of tocochromanol biosynthetic precursors is much more limited. While tocochromanol synthesis occurs in plastids, converging genetic data in Arabidopsis and soybean demonstrate that the synthesis of the polar precursor homogentisate is located in the cytoplasm. These data implies that tocochromanol synthesis involves several plastidic membrane transporter(s) that remain to be identified. In addition, the metabolic origin of the lipophilic isoprenoid precursor is not fully elucidated. While some genetic data exclusively attribute the synthesis of the prenyl component of tocochromanols to the plastidic methyl erythritol phosphate pathway, multiple lines of evidence provided by feeding experiments and metabolic engineering studies indicate that it might partially originate from the cytoplasmic mevalonate pathway. Although this question is still open, these data demonstrate the existence of membrane transporter(s) capable of importing cytosolic polyprenyl pyrophosphate such as farnesyl pyrophosphate into plastids. Since the availability of both homogentisate and polyprenyl pyrophosphates are currently accepted as major mechanisms controlling the type and amount of tocochromanols produced in plant tissues, we summarized our current knowledge and research gaps concerning the biosynthesis, metabolic origins and transport of tocochromanol biosynthetic precursors in plant cells.
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