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Kuluev B, Uteulin K, Bari G, Baimukhametova E, Musin K, Chemeris A. Molecular Genetic Research and Genetic Engineering of Taraxacum kok-saghyz L.E. Rodin. PLANTS (BASEL, SWITZERLAND) 2023; 12:1621. [PMID: 37111845 PMCID: PMC10144037 DOI: 10.3390/plants12081621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 03/28/2023] [Accepted: 04/03/2023] [Indexed: 06/19/2023]
Abstract
Natural rubber (NR) remains an indispensable raw material with unique properties that is used in the manufacture of a large number of products and the global demand for it is growing every year. The only industrially important source of NR is the tropical tree Hevea brasiliensis (Willd. ex A.Juss.) Müll.Arg., thus alternative sources of rubber are required. For the temperate zone, the most suitable source of high quality rubber is the Russian (Kazakh) dandelion Taraxacum kok-saghyz L.E. Rodin (TKS). An obstacle to the widespread industrial cultivation of TKS is its high heterozygosity, poor growth energy, and low competitiveness in the field, as well as inbreeding depression. Rapid cultivation of TKS requires the use of modern technologies of marker-assisted and genomic selection, as well as approaches of genetic engineering and genome editing. This review is devoted to describing the progress in the field of molecular genetics, genomics, and genetic engineering of TKS. Sequencing and annotation of the entire TKS genome made it possible to identify a large number of SNPs, which were subsequently used in genotyping. To date, a total of 90 functional genes have been identified that control the rubber synthesis pathway in TKS. The most important of these proteins are part of the rubber transferase complex and are encoded by eight genes for cis-prenyltransferases (TkCPT), two genes for cis-prenyltransferase-like proteins (TkCPTL), one gene for rubber elongation factor (TkREF), and nine genes for small rubber particle proteins (TkSRPP). In TKS, genes for enzymes of inulin metabolism have also been identified and genome-wide studies of other gene families are also underway. Comparative transcriptomic and proteomic studies of TKS lines with different accumulations of NR are also being carried out, which help to identify genes and proteins involved in the synthesis, regulation, and accumulation of this natural polymer. A number of authors already use the knowledge gained in the genetic engineering of TKS and the main goal of these works is the rapid transformation of the TKS into an economically viable rubber crop. There are no great successes in this area so far, therefore work on genetic transformation and genome editing of TKS should be continued, considering the recent results of genome-wide studies.
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Affiliation(s)
- Bulat Kuluev
- Institute of Biochemistry and Genetics of UFRC RAS, 71 Pr. Oktyabrya, 450054 Ufa, Russia
| | - Kairat Uteulin
- Institute of Plant Biology and Biotechnology, St. Timiryazev 45, 050040 Almaty, Kazakhstan
| | - Gabit Bari
- Laboratory of Microclonal Propagation of Plants, Kazakh National Agrarian Research University, St. Valikhanov 137, 050000 Almaty, Kazakhstan
| | - Elvina Baimukhametova
- Institute of Biochemistry and Genetics of UFRC RAS, 71 Pr. Oktyabrya, 450054 Ufa, Russia
| | - Khalit Musin
- Institute of Biochemistry and Genetics of UFRC RAS, 71 Pr. Oktyabrya, 450054 Ufa, Russia
| | - Alexey Chemeris
- Institute of Biochemistry and Genetics of UFRC RAS, 71 Pr. Oktyabrya, 450054 Ufa, Russia
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Yang Y, Qin B, Chen Q, Nie Q, Zhang J, Zhang L, Liu S. Construction of the first high-density SNP genetic map and identification of QTLs for the natural rubber content in Taraxacum kok-saghyz Rodin. BMC Genomics 2023; 24:13. [PMID: 36627555 PMCID: PMC9830913 DOI: 10.1186/s12864-022-09105-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 12/30/2022] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Taraxacum kok-saghyz Rodin (TKS) is a promising commercial alternative natural rubber (NR) yielding plant. Cultivating TKS with a high NR content is an important breeding target, and developing molecular markers related to NR content can effectively accelerate the breeding process of TKS. RESULTS To construct a high-density SNP genetic map and uncover genomic regions related to the NR content in TKS, an F1 mapping population of TKS was constructed by crossing two parents (l66 and X51) with significant differences in NR contents. The NR content of the F1 plants ranged from 0.30 to 15.14% and was distributed normally with a coefficient of variation of 47.61%, indicating quantitative trait inheritance. Then, employing whole-genome resequencing (WGR), a TKS genetic linkage map of 12,680 bin markers comprising 322,439 SNPs was generated. Based on the genetic map and NR content of the F1 population, six quantitative trait loci (QTLs) for NR content with LOD > 4.0 were identified on LG01/Chr01 and LG06/Chr06. Of them, the 2.17 Mb genomic region between qHRC-C6-1 and qHRC-C6-2 on ChrA06, with 65.62% PVE in total, was the major QTL region. In addition, the six QTLs have significant additive genetic effects on NR content and could be used to develop markers for marker-assisted selection (MAS) in TKS with a high NR content. CONCLUSION This work constructed the first high-density TKS genetic map and identified the QTLs and genomic regions controlling the NR content, which provides useful information for fine mapping, map-based cloning, and MAS in TKS.
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Affiliation(s)
- Yushuang Yang
- grid.453499.60000 0000 9835 1415Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, 571101 Haikou, China
| | - Bi Qin
- grid.453499.60000 0000 9835 1415Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, 571101 Haikou, China
| | - Qiuhui Chen
- grid.453499.60000 0000 9835 1415Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, 571101 Haikou, China
| | - Qiuhai Nie
- Beijing Linglong Dandelion Technology and Development Ltd, 101102 Beijing, China
| | - Jichuan Zhang
- grid.48166.3d0000 0000 9931 8406College of Materials and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China
| | - Liqun Zhang
- grid.48166.3d0000 0000 9931 8406College of Materials and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China
| | - Shizhong Liu
- grid.453499.60000 0000 9835 1415Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, 571101 Haikou, China
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Sapkota S, Boggess SL, Trigiano RN, Klingeman WE, Hadziabdic D, Coyle DR, Olukolu BA, Kuster RD, Nowicki M. Microsatellite Loci Reveal Genetic Diversity of Asian Callery Pear ( Pyrus calleryana) in the Species Native Range and in the North American Cultivars. Life (Basel) 2021; 11:531. [PMID: 34200292 PMCID: PMC8226646 DOI: 10.3390/life11060531] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 05/30/2021] [Accepted: 06/04/2021] [Indexed: 12/05/2022] Open
Abstract
Pyrus calleryana Decne. (Callery pear) includes cultivars that in the United States are popular ornamentals in commercial and residential landscapes. Last few decades, this species has increasingly naturalized across portions of the eastern and southern US. However, the mechanisms behind this plant's spread are not well understood. The genetic relationship of present-day P.calleryana trees with their Asian P. calleryana forebears (native trees from China, Japan, and Korea) and the original specimens of US cultivars are unknown. We developed and used 18 microsatellite markers to analyze 147 Pyrus source samples and to articulate the status of genetic diversity within Asian P. calleryana and US cultivars. We hypothesized that Asian P. calleryana specimens and US cultivars would be genetically diverse and would show genetic relatedness. Our data revealed high genetic diversity, high gene flow, and presence of population structure in P. calleryana, potentially relating to the highly invasive capability of this species. Strong evidence for genetic relatedness between Asian P. calleryana specimens and US cultivars was also demonstrated. Our data suggest the source for P. calleryana that have become naturalized in US was China. These results will help understand the genetic complexity of invasive P. calleryana when developing management for escaped populations: In follow-up studies, we use the gSSRs developed here to analyze P. calleryana escape populations from across US.
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Affiliation(s)
- Shiwani Sapkota
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - Sarah L. Boggess
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - Robert N. Trigiano
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - William E. Klingeman
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA;
| | - Denita Hadziabdic
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - David R. Coyle
- Department of Forestry and Environmental Conservation, Clemson University, Clemson, SC 29634, USA;
| | - Bode A. Olukolu
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - Ryan D. Kuster
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
| | - Marcin Nowicki
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA; (S.S.); (S.L.B.); (R.N.T.); (D.H.); (B.A.O.); (R.D.K.)
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Zhang Y, Ren H, Zhang X, Wang L, Gao Q, Abudurezike A, Yan Q, Lu Z, Wang Y, Nie Q, Xu L, Zhang Z. Genetic diversity and evolutionary patterns of Taraxacum kok-saghyz Rodin. Ecol Evol 2021; 11:7917-7926. [PMID: 34188861 PMCID: PMC8216896 DOI: 10.1002/ece3.7622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 04/10/2021] [Accepted: 04/13/2021] [Indexed: 12/16/2022] Open
Abstract
Taraxacum kok-saghyz Rodin (TKS) is an important potential alternative source of natural inulin and rubber production, which has great significance for the production of industrial products. In this study, we sequenced 58 wild TKS individuals collected from four different geography regions worldwide to elucidate the population structure, genetic diversity, and the patterns of evolution. Also, the first flowering time, crown diameter, morphological characteristics of leaf, and scape of all TKS individuals were measured and evaluated statistically. Phylogenetic analysis based on SNPs and cluster analysis based on agronomic traits showed that all 58 TKS individuals could be roughly divided into three distinct groups: (a) Zhaosu County in Xinjiang (population AB, including a few individuals from population C and D); (b) Tekes County in Xinjiang (population C); and (c) Tuzkol lake in Kazakhstan (population D). Population D exhibited a closer genetic relationship with population C compared with population AB. Genetic diversity analysis further revealed that population expansion from C and D to AB occurred, as well as gene flow between them. Additionally, some natural selection regions were identified in AB population. Function annotation of candidate genes identified in these regions revealed that they mainly participated in biological regulation processes, such as transporter activity, structural molecule activity, and molecular function regulator. We speculated that the genes identified in selective sweep regions may contribute to TKS adaptation to the Yili River Valley of Xinjiang. In general, this study provides new insights in clarifying population structure and genetic diversity analysis of TKS using SNP molecular markers and agronomic traits.
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Affiliation(s)
- Yan Zhang
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Hailong Ren
- Guangzhou Academy of Agricultural SciencesGuangzhouChina
| | - Xuechao Zhang
- Institute of Agricultural Sciences of the Yili PrefectureYiningChina
| | - Li Wang
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Qiang Gao
- Sanya Crop Breeding Test CenterXinjiang Academy of Agricultural SciencesSanyaChina
| | | | - Qingqing Yan
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Zifeng Lu
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Yonggang Wang
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Qiuhai Nie
- Linglong Beijing Dandelion Technology& Development Co., Ltd.BeijingChina
| | - Lin Xu
- Institute of Crop Germplasm ResourcesXinjiang Academy of Agricultural SciencesUrumqiChina
| | - Zhibin Zhang
- State Key Laboratory of Cotton BiologyInstitute of Cotton ResearchChinese Academy of Agricultural SciencesAnyangChina
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Wollenweber TE, van Deenen N, Roelfs KU, Prüfer D, Gronover CS. Microscopic and Transcriptomic Analysis of Pollination Processes in Self-Incompatible Taraxacum koksaghyz. PLANTS 2021; 10:plants10030555. [PMID: 33809548 PMCID: PMC7998978 DOI: 10.3390/plants10030555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 03/12/2021] [Accepted: 03/13/2021] [Indexed: 11/23/2022]
Abstract
The transition of the Russian dandelion Taraxacum koksaghyz (Asteraceae) to a profitable, alternative crop producing natural rubber and inulin requires the optimization of several agronomic traits, cultivation conditions and harvesting procedures to improve the yield. However, efficient breeding is hindered by the obligatory sexual outcrossing of this species. Several other asters have been investigated to determine the mechanism of self-incompatibility, but the underlying molecular basis remains unclear. We therefore investigated the self-pollination and cross-pollination of two compatible T. koksaghyz varieties (TkMS2 and TkMS3) by microscopy and transcriptomic analysis to shed light on the pollination process. Self-pollination showed typical sporophytic self-incompatibility characteristics, with the rare pollen swelling at the pollen tube apex. In contrast, cross-pollination was characterized by pollen germination and penetration of the stigma by the growing pollen tubes. RNA-Seq was used to profile gene expression in the floret tissue during self-pollination and cross-pollination, and the differentially expressed genes were identified. This revealed three candidates for the early regulation of pollination in T. koksaghyz, which can be used to examine self-incompatibility mechanisms in more detail and to facilitate breeding programs.
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Affiliation(s)
- Tassilo Erik Wollenweber
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143 Muenster, Germany; (T.E.W.); (N.v.D.); (D.P.)
| | - Nicole van Deenen
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143 Muenster, Germany; (T.E.W.); (N.v.D.); (D.P.)
| | - Kai-Uwe Roelfs
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Muenster, Germany;
| | - Dirk Prüfer
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143 Muenster, Germany; (T.E.W.); (N.v.D.); (D.P.)
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Muenster, Germany;
| | - Christian Schulze Gronover
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Muenster, Germany;
- Correspondence: ; Tel.: +49(0)251-83-24998
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Development and Characterization of 15 Novel Genomic SSRs for Viburnum farreri. PLANTS 2021; 10:plants10030487. [PMID: 33807587 PMCID: PMC8000228 DOI: 10.3390/plants10030487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 11/17/2022]
Abstract
The Viburnum genus is of particular interest to horticulturalists, phylogeneticists, and biogeographers. Despite its popularity, there are few existing molecular markers to investigate genetic diversity in this large genus, which includes over 160 species. There are also few polymorphic molecular tools that can delineate closely related species within the genus. Viburnum farreri, a member of the Solenotinus subclade and one of the centers of diversity for Viburnum, was selected for DNA sequencing and development of genomic simple sequence repeats (gSSRs). In this study, 15 polymorphic gSSRs were developed and characterized for a collection of 19 V. farreri samples. Number of alleles per locus ranged from two- to- eight and nine loci had four or more alleles. Observed heterozygosity ranged from 0 to 0.84 and expected heterozygosity ranged from 0.10 to 0.80 for the 15 loci. Shannon diversity index values across these loci ranged from 0.21 to 1.62. The markers developed in this study add to the existing molecular toolkit for the genus and will be used in future studies investigating cross-transferability, genetic variation, and species and cultivar delimitation in the Viburnum genus and closely allied genera in the Adoxaceae and Caprifoliaceae.
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Nowicki M, Houston LC, Boggess SL, Aiello AS, Payá‐Milans M, Staton ME, Hayashida M, Yamanaka M, Eda S, Trigiano RN. Species diversity and phylogeography of Cornus kousa (Asian dogwood) captured by genomic and genic microsatellites. Ecol Evol 2020; 10:8299-8312. [PMID: 32788980 PMCID: PMC7417245 DOI: 10.1002/ece3.6537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 06/09/2020] [Indexed: 01/01/2023] Open
Abstract
Cornus kousa (Asian dogwood), an East Asia native tree, is the most economically important species of the dogwood genus, owing to its desirable horticultural traits and ability to hybridize with North America-native dogwoods. To assess the species genetic diversity and to better inform the ongoing and future breeding efforts, we assembled an herbarium and arboretum collection of 131 noncultivated C. kousa specimens. Genotyping and capillary electrophoresis analyses of our C. kousa collection with the newly developed genic and published nuclear genomic microsatellites permitted assessment of genetic diversity and evolutionary history of the species. Regardless of the microsatellite type used, the study yielded generally similar insights into the C. kousa diversity with subtle differences deriving from and underlining the marker used. The accrued evidence pointed to the species distinct genetic pools related to the plant country of origin. This can be helpful in the development of the commercial cultivars for this important ornamental crop with increased pyramided utility traits. Analyses of the C. kousa evolutionary history using the accrued genotyping datasets pointed to an unsampled ancestor population, possibly now extinct, as per the phylogeography of the region. To our knowledge, there are few studies utilizing the same gDNA collection to compare performance of genomic and genic microsatellites. This is the first detailed report on C. kousa species diversity and evolutionary history inference.
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Affiliation(s)
- Marcin Nowicki
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
| | - Logan C. Houston
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
| | - Sarah L. Boggess
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
| | | | - Miriam Payá‐Milans
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
- Present address:
Centro de Biotecnología y Genómica de PlantasUPM‐INIAMadridSpain
| | - Margaret E. Staton
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
| | | | - Masahiro Yamanaka
- Department of Pharmaceytical SciencesInternational University of Health and WelfareOhtawaraJapan
| | - Shigetoshi Eda
- Department of Forestry, Wildlife and FisheriesCenter for Wildlife Health ORUKnoxvilleTNUSA
- Department of MicrobiologyCenter for Wildlife Health ORUKnoxvilleTNUSA
| | - Robert N. Trigiano
- Department of Entomology and Plant PathologyThe University of TennesseeKnoxvilleTNUSA
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Cherian S, Ryu SB, Cornish K. Natural rubber biosynthesis in plants, the rubber transferase complex, and metabolic engineering progress and prospects. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:2041-2061. [PMID: 31150158 PMCID: PMC6790360 DOI: 10.1111/pbi.13181] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 05/24/2019] [Accepted: 05/29/2019] [Indexed: 05/26/2023]
Abstract
Natural rubber (NR) is a nonfungible and valuable biopolymer, used to manufacture ~50 000 rubber products, including tires and medical gloves. Current production of NR is derived entirely from the para rubber tree (Hevea brasiliensis). The increasing demand for NR, coupled with limitations and vulnerability of H. brasiliensis production systems, has induced increasing interest among scientists and companies in potential alternative NR crops. Genetic/metabolic pathway engineering approaches, to generate NR-enriched genotypes of alternative NR plants, are of great importance. However, although our knowledge of rubber biochemistry has significantly advanced, our current understanding of NR biosynthesis, the biosynthetic machinery and the molecular mechanisms involved remains incomplete. Two spatially separated metabolic pathways provide precursors for NR biosynthesis in plants and their genes and enzymes/complexes are quite well understood. In contrast, understanding of the proteins and genes involved in the final step(s)-the synthesis of the high molecular weight rubber polymer itself-is only now beginning to emerge. In this review, we provide a critical evaluation of recent research developments in NR biosynthesis, in vitro reconstitution, and the genetic and metabolic pathway engineering advances intended to improve NR content in plants, including H. brasiliensis, two other prospective alternative rubber crops, namely the rubber dandelion and guayule, and model species, such as lettuce. We describe a new model of the rubber transferase complex, which integrates these developments. In addition, we highlight the current challenges in NR biosynthesis research and future perspectives on metabolic pathway engineering of NR to speed alternative rubber crop commercial development.
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Affiliation(s)
- Sam Cherian
- Plant Systems Engineering Research CentreKorea Research Institute of Bioscience and Biotechnology (KRIBB)Yuseong‐guDaejeonKorea
- Research & Development CenterDRB Holding Co. LTDBusanKorea
| | - Stephen Beungtae Ryu
- Plant Systems Engineering Research CentreKorea Research Institute of Bioscience and Biotechnology (KRIBB)Yuseong‐guDaejeonKorea
- Department of Biosystems and BioengineeringKRIBB School of BiotechnologyKorea University of Science and Technology (UST)DaejeonKorea
| | - Katrina Cornish
- Department of Horticulture and Crop ScienceThe Ohio State UniversityWoosterOHUSA
- Department of Food, Agricultural and Biological EngineeringThe Ohio State UniversityWoosterOHUSA
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