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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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2
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Liu S, Liu Z, Hou X, Li X. Genetic mapping and functional genomics of soybean seed protein. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2023; 43:29. [PMID: 37313523 PMCID: PMC10248706 DOI: 10.1007/s11032-023-01373-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 03/25/2023] [Indexed: 06/15/2023]
Abstract
Soybean is an utterly important crop for high-quality meal protein and vegetative oil. Soybean seed protein content has become a key factor in nutrients for livestock feed as well as human dietary consumption. Genetic improvement of soybean seed protein is highly desired to meet the demands of rapidly growing world population. Molecular mapping and genomic analysis in soybean have identified many quantitative trait loci (QTL) underlying seed protein content control. Exploring the mechanisms of seed storage protein regulation will be helpful to achieve the improvement of protein content. However, the practice of breeding higher protein soybean is challenging because soybean seed protein is negatively correlated with seed oil content and yield. To overcome the limitation of such inverse relationship, deeper insights into the property and genetic control of seed protein are required. Recent advances of soybean genomics have strongly enhanced the understandings for molecular mechanisms of soybean with better seed quality. Here, we review the research progress in the genetic characteristics of soybean storage protein, and up-to-date advances of molecular mappings and genomics of soybean protein. The key factors underlying the mechanisms of the negative correlation between protein and oil in soybean seeds are elaborated. We also briefly discuss the future prospects of breaking the bottleneck of the negative correlation to develop high protein soybean without penalty of oil and yield. Supplementary Information The online version contains supplementary material available at 10.1007/s11032-023-01373-5.
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Affiliation(s)
- Shu Liu
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Zhaojun Liu
- Heilongjiang Academy of Agricultural Sciences, Harbin, 150086 China
| | - Xingliang Hou
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650 China
- Hainan Yazhou Bay Seed Laboratory, Sanya, 572025 China
| | - Xiaoming Li
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650 China
- Hainan Yazhou Bay Seed Laboratory, Sanya, 572025 China
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3
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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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Bai M, Yuan J, Kuang H, Gong P, Li S, Zhang Z, Liu B, Sun J, Yang M, Yang L, Wang D, Song S, Guan Y. Generation of a multiplex mutagenesis population via pooled CRISPR-Cas9 in soya bean. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:721-731. [PMID: 31452351 PMCID: PMC7004907 DOI: 10.1111/pbi.13239] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 07/17/2019] [Accepted: 08/15/2019] [Indexed: 05/08/2023]
Abstract
The output of genetic mutant screenings in soya bean [Glycine max (L.) Merr.] has been limited by its paleopolypoid genome. CRISPR-Cas9 can generate multiplex mutants in crops with complex genomes. Nevertheless, the transformation efficiency of soya bean remains low and, hence, remains the major obstacle in the application of CRISPR-Cas9 as a mutant screening tool. Here, we report a pooled CRISPR-Cas9 platform to generate soya bean multiplex mutagenesis populations. We optimized the key steps in the screening protocol, including vector construction, sgRNA assessment, pooled transformation, sgRNA identification and gene editing verification. We constructed 70 CRISPR-Cas9 vectors to target 102 candidate genes and their paralogs which were subjected to pooled transformation in 16 batches. A population consisting of 407 T0 lines was obtained containing all sgRNAs at an average mutagenesis frequency of 59.2%, including 35.6% lines carrying multiplex mutations. The mutation frequency in the T1 progeny could be increased further despite obtaining a transgenic chimera. In this population, we characterized gmric1/gmric2 double mutants with increased nodule numbers and gmrdn1-1/1-2/1-3 triple mutant lines with decreased nodulation. Our study provides an advanced strategy for the generation of a targeted multiplex mutant population to overcome the gene redundancy problem in soya bean as well as in other major crops.
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Affiliation(s)
- Mengyan Bai
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Juehui Yuan
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Huaqin Kuang
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Pingping Gong
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Suning Li
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
- College of Life SciencesFujian Agriculture and Forestry UniversityFuzhouChina
| | - Zhihui Zhang
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Bo Liu
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Jiafeng Sun
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Maoxiang Yang
- College of Resources and EnvironmentFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhouChina
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Lan Yang
- Key Laboratory of Molecular Biology and Gene Engineering in Jiangxi ProvinceCollege of Life ScienceNanchang UniversityJiangxiChina
| | - Dong Wang
- Key Laboratory of Molecular Biology and Gene Engineering in Jiangxi ProvinceCollege of Life ScienceNanchang UniversityJiangxiChina
| | - Shikui Song
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
| | - Yuefeng Guan
- FAFU‐UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhouChina
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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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Campbell BW, Hofstad AN, Sreekanta S, Fu F, Kono TJY, O'Rourke JA, Vance CP, Muehlbauer GJ, Stupar RM. Fast neutron-induced structural rearrangements at a soybean NAP1 locus result in gnarled trichomes. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:1725-38. [PMID: 27282876 PMCID: PMC4983299 DOI: 10.1007/s00122-016-2735-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 05/28/2016] [Indexed: 05/20/2023]
Abstract
KEY MESSAGE Three adjacent and distinct sequence rearrangements were identified at a NAP1 locus in a soybean mutant. Genetic dissection and validation revealed the function of this gene in soybean trichome development. A soybean (Glycine max (L.) Merr.) gnarled trichome mutant, exhibiting stunted trichomes compared to wild-type, was identified in a fast neutron mutant population. Genetic mapping using whole genome sequencing-based bulked segregant analysis identified a 26.6 megabase interval on chromosome 20 that co-segregated with the phenotype. Comparative genomic hybridization analysis of the mutant indicated that the chromosome 20 interval included a small structural variant within the coding region of a soybean ortholog (Glyma.20G019300) of Arabidopsis Nck-Associated Protein 1 (NAP1), a regulator of actin nucleation during trichome morphogenesis. Sequence analysis of the candidate allele revealed multiple rearrangements within the coding region, including two deletions (approximately 1-2 kb each), a translocation, and an inversion. Further analyses revealed that the mutant allele perfectly co-segregated with the phenotype, and a wild-type soybean NAP1 transgene functionally complemented an Arabidopsis nap1 mutant. In addition, mapping and exon sequencing of NAP1 in a spontaneous soybean gnarled trichome mutant (T31) identified a frame shift mutation resulting in a truncation of the coding region. These data indicate that the soybean NAP1 gene is essential for proper trichome development and show the utility of the soybean fast neutron population for forward genetic approaches for identifying genes.
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Affiliation(s)
- Benjamin W Campbell
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Anna N Hofstad
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Suma Sreekanta
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Fengli Fu
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Thomas J Y Kono
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Jamie A O'Rourke
- USDA-ARS, Corn Insects and Crop Genetics Research, Iowa State University, Ames, IA, 50011, USA
| | - Carroll P Vance
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Gary J Muehlbauer
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA
- Department of Plant Biology, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Robert M Stupar
- Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, MN, 55108, USA.
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