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Gianinetti A, Ghizzoni R, Desiderio F, Morcia C, Terzi V, Baronchelli M. QTL Analysis of β-Glucan Content and Other Grain Traits in a Recombinant Population of Spring Barley. Int J Mol Sci 2024; 25:6296. [PMID: 38928003 PMCID: PMC11204098 DOI: 10.3390/ijms25126296] [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: 05/09/2024] [Revised: 06/03/2024] [Accepted: 06/04/2024] [Indexed: 06/28/2024] Open
Abstract
Barley with high grain β-glucan content is valuable for functional foods. The identification of loci for high β-glucan content is, thus, of great importance for barley breeding. Segregation mapping for the content in β-glucan and other barley grain components (starch, protein, lipid, ash, phosphorous, calcium, sodium) was performed using the progeny of the cross between Glacier AC38, a mutant with high amylose, and CDC Fibar, a high β-glucan waxy cultivar. The offspring of this cross showed transgressive segregation for β-glucan content. Linkage analysis based on single-nucleotide polymorphism (SNP) molecular markers was used for the genotyping of the parents and recombinant inbred lines (RILs). Two Quantitative Trait Loci (QTL) for β-glucan content and several QTL for other grain components were found. The former ones, located on chromosomes 1H and 7H, explained 27.9% and 27.4% of the phenotypic variance, respectively. Glacier AC38 provided the allele for high β-glucan content at the QTL on chromosome 1H, whereas CDC Fibar contributed the allele at the QTL on chromosome 7H. Their recombination resulted in a novel haplotype with higher β-glucan content, up to 18.4%. Candidate genes are proposed for these two QTL: HvCslF9, involved in β-glucan biosynthesis, for the QTL on chromosome 1H; Horvu_PLANET_7H01G069300, a gene encoding an ATP-Binding Cassette (ABC) transporter, for the QTL on chromosome 7H.
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Tang H, Dong H, Guo X, Cheng M, Li M, Chen Q, Yuan Z, Pu Z, Wang J. Identification of candidate gene for the defective kernel phenotype using bulked segregant RNA and exome capture sequencing methods in wheat. FRONTIERS IN PLANT SCIENCE 2023; 14:1173861. [PMID: 37342127 PMCID: PMC10277647 DOI: 10.3389/fpls.2023.1173861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 05/03/2023] [Indexed: 06/22/2023]
Abstract
Wheat is a significant source of protein and starch worldwide. The defective kernel (Dek) mutant AK-3537, displaying a large hollow area in the endosperm and shrunken grain, was obtained through ethyl methane sulfonate (EMS) treatment of the wheat cultivar Aikang 58 (AK58). The mode of inheritance of the AK-3537 grain Dek phenotype was determined to be recessive with a specific statistical significance level. We used bulked segregant RNA-seq (BSR-seq), BSA-based exome capture sequencing (BSE-seq), and the ΔSNP-index algorithm to identify candidate regions for the grain Dek phenotype. Two major candidate regions, DCR1 (Dek candidate region 1) and DCR2, were identified on chromosome 7A between 279.98 and 287.93 Mb and 565.34 and 568.59 Mb, respectively. Based on transcriptome analysis and previous reports, we designed KASP genotyping assays based on SNP variations in the candidate regions and speculated that the candidate gene is TraesCS7A03G0625900 (HMGS-7A), which encodes a 3-hydroxy-3-methylglutaryl-CoA synthase. One SNP variation located at position 1,049 in the coding sequence (G>A) causes an amino acid change from Gly to Asp. The research suggests that functional changes in HMGS-7A may affect the expression of key enzyme genes involved in wheat starch syntheses, such as GBSSII and SSIIIa.
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Affiliation(s)
- Hao Tang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Huixue Dong
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Xiaojiang Guo
- Ministry of Education Key Laboratory for Crop Genetic Resources and Improvement in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Mengping Cheng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Maolian Li
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Qian Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Zhongwei Yuan
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Zhien Pu
- Ministry of Education Key Laboratory for Crop Genetic Resources and Improvement in Southwest China, Sichuan Agricultural University, Chengdu, China
| | - Jirui Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, China
- Ministry of Education Key Laboratory for Crop Genetic Resources and Improvement in Southwest China, Sichuan Agricultural University, Chengdu, China
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Ying Y, Hu Y, Zhang Y, Tappiban P, Zhang Z, Dai G, Deng G, Bao J, Xu F. Identification of a new allele of soluble starch synthase IIIa involved in the elongation of amylopectin long chains in a chalky rice mutant. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 328:111567. [PMID: 36526029 DOI: 10.1016/j.plantsci.2022.111567] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 11/03/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
A chalky endosperm mutant (GM03) induced from an indica rice GLA4 was used to investigate the functional gene in starch biosynthesis. Bulked segregant analysis and sanger sequencing determined that a novel mutation in soluble starch synthase IIIa (SSIIIa) is responsible for the chalky phenotype in GM03. Complementary test by transforming the active SSIIIa gene driven by its native promoter to GM03 recovered the phenotype to its wildtype. The expression of SSIIIa was significantly decreased, while SSIIIa protein was not detected in GM03. The mutation of SSIIIa led to increased expression of most of starch synthesis related genes and elevated the levels of most of proteins in GM03. The CRISPR/Cas9 technology was used for targeted disruption of SSIIIa, and the mutant lines exhibited chalky endosperm which phenocopied the GM03. Additionally, the starch fine structure in the knockout mutant lines ss3a-1 and ss3a-2 was similar with the GM03, which showed increased amylose content, higher proportions of B1 and B2 chains, much lower proportions of B3 chains and decreased degree of crystallinity, leading to altered thermal properties with lower gelatinization temperature and enthalpy. Collectively, these results suggested that SSIIIa plays an important role in starch synthesis by elongating amylopectin long chains in rice.
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Affiliation(s)
- Yining Ying
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; Hainan Institute of Zhejiang University, Yazhou Bay Science and Technology City, Yazhou District, Sanya 572025, China
| | - Yaqi Hu
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
| | - Yanni Zhang
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
| | - Piengtawan Tappiban
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
| | - Zhongwei Zhang
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
| | - Gaoxing Dai
- Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
| | - Guofu Deng
- Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
| | - Jinsong Bao
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; Hainan Institute of Zhejiang University, Yazhou Bay Science and Technology City, Yazhou District, Sanya 572025, China.
| | - Feifei Xu
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China.
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Fahy B, Gonzalez O, Savva GM, Ahn-Jarvis JH, Warren FJ, Dunn J, Lovegrove A, Hazard BA. Loss of starch synthase IIIa changes starch molecular structure and granule morphology in grains of hexaploid bread wheat. Sci Rep 2022; 12:10806. [PMID: 35752653 PMCID: PMC9233681 DOI: 10.1038/s41598-022-14995-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/16/2022] [Indexed: 11/30/2022] Open
Abstract
Starch synthase III plays a key role in starch biosynthesis and is highly expressed in developing wheat grains. To understand the contribution of SSIII to starch and grain properties, we developed wheat ssIIIa mutants in the elite cultivar Cadenza using in silico TILLING in a mutagenized population. SSIIIa protein was undetectable by immunoblot analysis in triple ssIIIa mutants carrying mutations in each homoeologous copy of ssIIIa (A, B and D). Loss of SSIIIa in triple mutants led to significant changes in starch phenotype including smaller A-type granules and altered granule morphology. Starch chain-length distributions of double and triple mutants indicated greater levels of amylose than sibling controls (33.8% of starch in triple mutants, and 29.3% in double mutants vs. 25.5% in sibling controls) and fewer long amylopectin chains. Wholemeal flour of triple mutants had more resistant starch (6.0% vs. 2.9% in sibling controls) and greater levels of non-starch polysaccharides; the grains appeared shrunken and weighed ~ 11% less than the sibling control which was partially explained by loss in starch content. Interestingly, our study revealed gene dosage effects which could be useful for fine-tuning starch properties in wheat breeding applications while minimizing impact on grain weight and quality.
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Affiliation(s)
| | - Oscar Gonzalez
- Quadram Institute Bioscience, Norwich Research Park, Norwich, NR4 7UQ, UK
| | - George M Savva
- Quadram Institute Bioscience, Norwich Research Park, Norwich, NR4 7UQ, UK
| | | | - Frederick J Warren
- Quadram Institute Bioscience, Norwich Research Park, Norwich, NR4 7UQ, UK
| | | | | | - Brittany A Hazard
- Quadram Institute Bioscience, Norwich Research Park, Norwich, NR4 7UQ, UK.
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Editing of the starch synthase IIa gene led to transcriptomic and metabolomic changes and high amylose starch in barley. Carbohydr Polym 2022; 285:119238. [DOI: 10.1016/j.carbpol.2022.119238] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 01/07/2022] [Accepted: 02/06/2022] [Indexed: 11/24/2022]
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Luo J, Liu L, Konik-Rose C, Tian L, Singh S, Howitt CA, Li Z, Liu Q. Down-Regulation of FAD2-1 Gene Expression Alters Lysophospholipid Composition in the Endosperm of Rice Grain and Influences Starch Properties. Foods 2021; 10:foods10061169. [PMID: 34071051 PMCID: PMC8224701 DOI: 10.3390/foods10061169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/15/2021] [Accepted: 05/17/2021] [Indexed: 12/18/2022] Open
Abstract
Small quantities of lipids accumulate in the white rice grains. These are grouped into non-starch lipid and starch lipid fractions that affect starch properties through association with starch. Lysophosphatidylcholine (LPC) and lysophosphatidylethanolamine (LPE) are two major lipid classes in the two fractions. Using high-oleic rice grains, we investigated the fatty-acid composition in flour and starch by LC-MS and evaluated its impact on starch properties. In the wild-type grain, nearly 50% of fatty acids in LPC and LPE were palmitic acid (C16:0), over 20% linoleic acid (C18:2) and less than 10% oleic acid (C18:1). In the high-oleic rice grain, C18:1 increased at the expense of C18:2 and C16:0. The compositional changes in starch lipids suggest that LPC and LPE are transported to an amyloplast with an origin from endoplasmic reticulum-derived PC and PE during endosperm development. The high-dissociation temperature of the amylose-lipid complex (ALC) and restricted starch swelling power in the high-oleic rice starch indicates that the stability of the ALC involving C18:1 is higher than that of C18:2 and C16:0. This study provides insight into the lipid deposition and starch properties of rice grains with optimized fatty-acid composition.
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Affiliation(s)
- Jixun Luo
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
- Commonwealth Scientific and Industrial Research Organisation, Precision Health Future Science Platform, Acton, ACT 2601, Australia
- Correspondence:
| | - Lei Liu
- Southern Cross Plant Sciences, Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia;
| | - Christine Konik-Rose
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
| | - Lijun Tian
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
- Commonwealth Scientific and Industrial Research Organisation, Precision Health Future Science Platform, Acton, ACT 2601, Australia
| | - Surinder Singh
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
| | - Crispin A. Howitt
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
- Commonwealth Scientific and Industrial Research Organisation, Precision Health Future Science Platform, Acton, ACT 2601, Australia
| | - Zhongyi Li
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
| | - Qing Liu
- Commonwealth Scientific and Industrial Research Organisation, Agriculture & Food, Acton, ACT 2601, Australia; (C.K.-R.); (L.T.); (S.S.); (C.A.H.); (Z.L.); (Q.L.)
- Commonwealth Scientific and Industrial Research Organisation, Precision Health Future Science Platform, Acton, ACT 2601, Australia
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Harris KF. An introductory review of resistant starch type 2 from high-amylose cereal grains and its effect on glucose and insulin homeostasis. Nutr Rev 2019; 77:748-764. [PMID: 31343688 PMCID: PMC6786898 DOI: 10.1093/nutrit/nuz040] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Refined carbohydrates result from milling techniques that remove the outer layers of a cereal grain and grind the endosperm into a flour ingredient that is devoid of dietary fiber. Technologies have been developed to produce high-amylose cereal grains that have a significantly higher resistant starch type 2 and thus dietary fiber content in the endosperm of the cereal grain, which has positive implications for human health. A review of the literature was conducted to study the effects of resistant starch type 2 derived from high-amylose grains on glucose and insulin response. While thousands of articles have been published on resistant starch, only 30 articles have focused on how resistant starch type 2 from high-amylose grains affects acute and long-term responses of glucose and insulin control. The findings showed that resistant starch has the ability to attenuate acute postprandial responses when replacing rapidly digestible carbohydrate sources, but there is insufficient evidence to conclude that resistant starch can improve insulin resistance and/or sensitivity.
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Affiliation(s)
- Kathryn F Harris
- Research and Development Department, Bay State Milling Company, Quincy, Massachusetts, USA
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Xu X, Vanhercke T, Shrestha P, Luo J, Akbar S, Konik-Rose C, Venugoban L, Hussain D, Tian L, Singh S, Li Z, Sharp PJ, Liu Q. Upregulated Lipid Biosynthesis at the Expense of Starch Production in Potato ( Solanum tuberosum) Vegetative Tissues via Simultaneous Downregulation of ADP-Glucose Pyrophosphorylase and Sugar Dependent1 Expressions. FRONTIERS IN PLANT SCIENCE 2019; 10:1444. [PMID: 31781148 PMCID: PMC6861213 DOI: 10.3389/fpls.2019.01444] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 10/17/2019] [Indexed: 05/05/2023]
Abstract
Triacylglycerol is a major component of vegetable oil in seeds and fruits of many plants, but its production in vegetative tissues is rather limited. It would be intriguing and important to explore any possibility to expand current oil production platforms, for example from the plant vegetative tissues. By expressing a suite of transgenes involved in the triacylglycerol biosynthesis, we have previously observed substantial accumulation of triacylglycerol in tobacco (Nicotiana tabacum) leaf and potato (Solanum tuberosum) tuber. In this study, simultaneous RNA interference (RNAi) downregulation of ADP-glucose pyrophosphorylase (AGPase) and Sugar-dependent1 (SDP1), was able to increase the accumulation of triacylglycerol and other lipids in both wild type potato and the previously generated high oil potato line 69. Particularly, a 16-fold enhancement of triacylglycerol production was observed in the mature transgenic tubers derived from the wild type potato, and a two-fold increase in triacylglycerol was observed in the high oil potato line 69, accounting for about 7% of tuber dry weight, which is the highest triacylglycerol accumulation ever reported in potato. In addition to the alterations of lipid content and fatty acid composition, sugar accumulation, starch content of the RNAi potato lines in both tuber and leaf tissues were also substantially changed, as well as the tuber starch properties. Microscopic analysis further revealed variation of lipid droplet distribution and starch granule morphology in the mature transgenic tubers compared to their parent lines. This study reflects that the carbon partitioning between lipid and starch in both leaves and non-photosynthetic tuber tissues, respectively, are highly orchestrated in potato, and it is promising to convert low-energy starch to storage lipids via genetic manipulation of the carbon metabolism pathways.
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Affiliation(s)
- Xiaoyu Xu
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
- Plant Breeding Institute and Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Thomas Vanhercke
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Pushkar Shrestha
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Jixun Luo
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Sehrish Akbar
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Christine Konik-Rose
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Lauren Venugoban
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Dawar Hussain
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Lijun Tian
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Surinder Singh
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Zhongyi Li
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
- *Correspondence: Zhongyi Li, ; Peter J. Sharp, ; Qing Liu,
| | - Peter J. Sharp
- Plant Breeding Institute and Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia
- *Correspondence: Zhongyi Li, ; Peter J. Sharp, ; Qing Liu,
| | - Qing Liu
- Research Program of Traits, CSIRO Agriculture and Food, Canberra, ACT, Australia
- *Correspondence: Zhongyi Li, ; Peter J. Sharp, ; Qing Liu,
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Crofts N, Iizuka Y, Abe N, Miura S, Kikuchi K, Matsushima R, Fujita N. Rice Mutants Lacking Starch Synthase I or Branching Enzyme IIb Activity Altered Starch Biosynthetic Protein Complexes. FRONTIERS IN PLANT SCIENCE 2018; 9:1817. [PMID: 30581451 PMCID: PMC6292963 DOI: 10.3389/fpls.2018.01817] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 11/22/2018] [Indexed: 05/21/2023]
Abstract
Amylopectin, the major component of starch, is synthesized by synergistic activity of multiple isozymes of starch synthases (SSs) and branching enzymes (BEs). The frequency and length of amylopectin branches determine the functionality of starch. In the rice endosperm, BEIIb generates short side chains of amylopectin and SSI elongates those branches, which can be further elongated by SSIIa. Absence of these enzymes greatly affects amylopectin structure. SSI, SSIIa, and BEIIb associate with each other and with other starch biosynthetic enzymes although SSIIa is low activity in japonica rice. The aim of the current study was to understand how the activity of starch biosynthetic enzyme complexes is compensated in the absence of SSI or BEIIb, and whether the compensatory effects are different in the absence of BEIIb or in the presence of inactive BEIIb. Interactions between starch biosynthetic enzymes were analyzed using one ss1 null mutant and two be2b japonica rice mutants (a mutant producing inactive BEIIb and a mutant that did not produce BEIIb). Soluble proteins extracted from the developing rice seeds were separated by gel filtration chromatography. In the absence of BEIIb activity, BEIIa was eluted in a broad molecular weight range (60-700 kDa). BEIIa in the wild-type was eluted with a mass below 300 kDa. Further, majority of inactive BEIIb co-eluted with SSI, SSIIa, and BEI, in a mass fraction over 700 kDa, whereas only small amounts of these isozymes were found in the wild-type. Compared with the be2b lines, the ss1 mutant showed subtle differences in protein profiles, but the amounts of SSIIa, SSIVb, and BEI in the over-700-kDa fraction were elevated. Immunoprecipitation revealed reduced association of SSIIa and BEIIb in the ss1 mutant, while the association of BEIIb with SSI, SSIIa, SSIVb, BEI, and BEIIa were more pronounced in the be2b mutant that produced inactive BEIIb enzyme. Mass spectrometry and western blotting revealed that SSI, SSIIa, SSIIIa, BEI, BEIIa, starch phosphorylase 1, and pullulanase were bound to the starch granules in the be2b mutants, but not in the wild-type and ss1 mutant. These results will aid the understanding of the mechanism of amylopectin biosynthesis.
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Affiliation(s)
- Naoko Crofts
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Yuriko Iizuka
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Natsuko Abe
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Satoko Miura
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Kana Kikuchi
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Ryo Matsushima
- Institute of Plant Science and Resources, Okayama University, Okayama, Japan
| | - Naoko Fujita
- Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
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Shi K, Gu X, Lu W, Lu D. Effects of weak-light stress during grain filling on the physicochemical properties of normal maize starch. Carbohydr Polym 2018; 202:47-55. [DOI: 10.1016/j.carbpol.2018.08.114] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 08/24/2018] [Accepted: 08/26/2018] [Indexed: 11/27/2022]
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Abstract
The starch-rich endosperms of the Poaceae, which includes wild grasses and their domesticated descendents the cereals, have provided humankind and their livestock with the bulk of their daily calories since the dawn of civilization up to the present day. There are currently unprecedented pressures on global food supplies, largely resulting from population growth, loss of agricultural land that is linked to increased urbanization, and climate change. Since cereal yields essentially underpin world food and feed supply, it is critical that we understand the biological factors contributing to crop yields. In particular, it is important to understand the biochemical pathway that is involved in starch biosynthesis, since this pathway is the major yield determinant in the seeds of six out of the top seven crops grown worldwide. This review outlines the critical stages of growth and development of the endosperm tissue in the Poaceae, including discussion of carbon provision to the growing sink tissue. The main body of the review presents a current view of our understanding of storage starch biosynthesis, which occurs inside the amyloplasts of developing endosperms.
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Zhu F. Barley Starch: Composition, Structure, Properties, and Modifications. Compr Rev Food Sci Food Saf 2017; 16:558-579. [DOI: 10.1111/1541-4337.12265] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/07/2017] [Accepted: 03/10/2017] [Indexed: 10/19/2022]
Affiliation(s)
- Fan Zhu
- School of Chemical Sciences; Univ. of Auckland; Private Bag 92019 Auckland 1142 New Zealand
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Cory AT, Gangola MP, Anyia A, Båga M, Chibbar RN. Genotype, environment and G × E interaction influence (1,3;1,4)-β-d-glucan fine structure in barley (Hordeum vulgare L.). JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:743-752. [PMID: 27145288 DOI: 10.1002/jsfa.7789] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 03/09/2016] [Accepted: 04/28/2016] [Indexed: 05/20/2023]
Abstract
BACKGROUND The structure of β-glucan influences its use in cereal-based foods and feed. The objective of this study was to determine the effect of environment (E) and genotype (G) on β-glucan fine structure and its genetic control in two-row spring barley with normal starch characteristics. RESULTS A population of 89 recombinant inbred lines, derived from the cross of two-row spring barley genotypes Merit × H93174006 (H92076F1 × TR238), was characterized for concentration and structure of grain β-glucan in two environments. Results showed that concentrations of β-glucan, DP3, DP4 and DP3 + DP4 were positively correlated with each other, suggesting no preference for DP3 or DP4 subunit production in high- or low-β-glucan lines. The concentrations of β-glucan, DP3, DP4 and DP3:DP4 ratios were significantly influenced by genotype and environment. However, only DP3:DP4 ratio showed a significant effect of G × E interaction. Association mapping of candidate markers in 119 barley genotypes showed that marker CSLF6_4105 was associated with β-glucan concentration, whereas Bmac504 and Bmac211 were associated with DP3:DP4 ratio. Bmac273e was associated with both β-glucan concentration and DP3:DP4 ratio. CONCLUSION The grain β-glucan concentration and DP3:DP4 ratio are strongly affected by genotype and environment. Single-marker analyses suggested that the genetic control of β-glucan concentration and DP3:DP4 ratio was linked to separate chromosomal regions on barley genome. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Aron T Cory
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
| | - Manu P Gangola
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
| | - Anthony Anyia
- Alberta Innovates - Technology Futures, Vegreville, Alberta, Canada
| | - Monica Båga
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
| | - Ravindra N Chibbar
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
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14
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Ahmed Z, Tetlow IJ, Falk DE, Liu Q, Emes MJ. Resistant Starch Content Is Related to Granule Size in Barley. Cereal Chem 2016. [DOI: 10.1094/cchem-02-16-0025-r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zaheer Ahmed
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
- Department of Plant Breeding and Genetics, University of Agriculture Faisalabad, Pakistan
| | - Ian J. Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Duane E. Falk
- Department of Plant Agriculture, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Qiang Liu
- Agriculture and Agri-Food Canada, Food Research Program, 93 Stone Road West, Guelph, Ontario, N1G 5C9, Canada
| | - Michael J. Emes
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
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15
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Abstract
Starch-rich crops form the basis of our nutrition, but plants have still to yield all their secrets as to how they make this vital substance. Great progress has been made by studying both crop and model systems, and we approach the point of knowing the enzymatic machinery responsible for creating the massive, insoluble starch granules found in plant tissues. Here, we summarize our current understanding of these biosynthetic enzymes, highlighting recent progress in elucidating their specific functions. Yet, in many ways we have only scratched the surface: much uncertainty remains about how these components function together and are controlled. We flag-up recent observations suggesting a significant degree of flexibility during the synthesis of starch and that previously unsuspected non-enzymatic proteins may have a role. We conclude that starch research is not yet a mature subject and that novel experimental and theoretical approaches will be important to advance the field.
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Affiliation(s)
- Barbara Pfister
- Department of Biology, ETH Zurich, 8092, Zurich, Switzerland
| | - Samuel C Zeeman
- Department of Biology, ETH Zurich, 8092, Zurich, Switzerland.
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16
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Belobrajdic DP, Hino S, Kondo T, Jobling SA, Morell MK, Topping DL, Morita T, Bird AR. High wholegrain barley β-glucan lowers food intake but does not alter small intestinal macronutrient digestibility in ileorectostomised rats. Int J Food Sci Nutr 2016; 67:678-85. [PMID: 27282074 DOI: 10.1080/09637486.2016.1194811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Using barley cultivars differing widely in β-glucan content, we aimed to determine their effects on small intestinal macronutrient digestion in 24 ileorectostomised rats. The rats were fed 1 of 4 experimental diets, each containing a different barley variety, for 11 d. The diets had a content of 0, 2.1, 2.6 and 4.3 g of β-glucan/100 g. Feed intake and faecal excretion of fat, protein, starch, and non-starch polysaccharides were determined in the final 5 d of the study and apparent macronutrient digestibility calculated. Higher dietary levels of β-glucan (2.6% and 4.3%) lowered feed intake (by 15 and 19%, respectively) but final body weight was only lowered by the 4.3% β-glucan diet relative to rats fed the 0% β-glucan diet (all ps < 0.05). Protein, lipid and starch digestibility was unrelated to the dietary β-glucan content. Higher dietary levels of barley β-glucan lower feed intake of ileorectostomised rats, which is independent of intestinal fermentation and unrelated to macronutrient digestibility.
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Affiliation(s)
| | - Shingo Hino
- b Department of Applied Biological Chemistry, Faculty of Agriculture , Shizuoka University , Shizuoka , Japan
| | - Takashi Kondo
- b Department of Applied Biological Chemistry, Faculty of Agriculture , Shizuoka University , Shizuoka , Japan
| | | | | | | | - Tatsuya Morita
- b Department of Applied Biological Chemistry, Faculty of Agriculture , Shizuoka University , Shizuoka , Japan
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17
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Huang B, Keeling PL, Hennen-Bierwagen TA, Myers AM. Comparative in vitro analyses of recombinant maize starch synthases SSI, SSIIa, and SSIII reveal direct regulatory interactions and thermosensitivity. Arch Biochem Biophys 2016; 596:63-72. [PMID: 26940263 DOI: 10.1016/j.abb.2016.02.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/06/2016] [Accepted: 02/28/2016] [Indexed: 11/19/2022]
Abstract
Starch synthases SSI, SSII, and SSIII function in assembling the amylopectin component of starch, but their specific roles and means of coordination are not fully understood. Genetic analyses indicate regulatory interactions among SS classes, and physical interactions among them are known. The N terminal extension of cereal SSIII, comprising up to 1200 residues beyond the catalytic domain, is responsible at least in part for these interactions. Recombinant maize SSI, SSIIa, and full-length or truncated SSIII, were tested for functional interactions regarding enzymatic activity. Amino-terminal truncated SSIII exhibited reduced activity compared to full-length enzyme, and addition of the N terminus to the truncated protein stimulated catalytic activity. SSIII and SSI displayed a negative interaction that reduced total activity in a reconstituted system. These data demonstrate that SSIII is both a catalytic and regulatory factor. SSIII activity was reduced by approximately 50% after brief incubation at 45 °C, suggesting a role in reduced starch accumulation during growth in high temperatures. Buffer effects were tested to address a current debate regarding the SS mechanism. Glucan stimulated the SSIIa and SSIII reaction rate regardless of the buffer system, supporting the accepted mechanism in which glucosyl units are added to exogenous primer substrates.
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Affiliation(s)
- Binquan Huang
- Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Peter L Keeling
- Center for Biorenewable Chemicals, 1140K Biorenewables Research Laboratory, Iowa State University, Ames, IA 50011, USA
| | - Tracie A Hennen-Bierwagen
- Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Alan M Myers
- Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, IA 50011, USA.
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18
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Li Z. Analysis of Starch Synthase Activities in Wheat Grains using Native-PAGE. Bio Protoc 2016. [DOI: 10.21769/bioprotoc.1713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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19
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Thermal properties of barley starch and its relation to starch characteristics. Int J Biol Macromol 2015; 81:692-700. [DOI: 10.1016/j.ijbiomac.2015.08.068] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/28/2015] [Accepted: 08/30/2015] [Indexed: 11/20/2022]
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20
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Källman A, Bertoft E, Koch K, Sun C, Åman P, Andersson R. Starch structure in developing barley endosperm. Int J Biol Macromol 2015; 81:730-5. [PMID: 26361866 DOI: 10.1016/j.ijbiomac.2015.09.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 08/15/2015] [Accepted: 09/04/2015] [Indexed: 11/29/2022]
Abstract
Barley spikes of the cultivars/breeding lines Gustav, Karmosé and SLU 7 were harvested at 9, 12 and 24 days after flowering in order to study starch structure in developing barley endosperm. Kernel dry weight, starch content and amylose content increased during development. Structural analysis was performed on whole starch and included the chain-length distribution of the whole starches and their β-limit dextrins. Karmosé, possessing the amo1 mutation, had higher amylose content and a lower proportion of long chains (DP ≥38) in the amylopectin component than SLU 7 and Gustav. Structural differences during endosperm development were seen as a decrease in molar proportion of chains of DP 22-37 in whole starch. In β-limit dextrins, the proportion of Bfp-chains (DP 4-7) increased and the proportion of BSmajor-chains (DP 15-27) decreased during development, suggesting more frequent activity of starch branching enzymes at later stages of maturation, resulting in amylopectin with denser structure.
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Affiliation(s)
- Anna Källman
- Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, S-750 07 Uppsala, Sweden
| | - Eric Bertoft
- Food Science Department, University of Guelph, Guelph, ON N1G 2W1, Canada
| | - Kristine Koch
- Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, S-750 07 Uppsala, Sweden
| | - Chuanxin Sun
- Department of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, P.O. Box 7080, S-750 07 Uppsala, Sweden
| | - Per Åman
- Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, S-750 07 Uppsala, Sweden
| | - Roger Andersson
- Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, S-750 07 Uppsala, Sweden.
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21
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Luo J, Ahmed R, Kosar-Hashemi B, Larroque O, Butardo VM, Tanner GJ, Colgrave ML, Upadhyaya NM, Tetlow IJ, Emes MJ, Millar A, Jobling SA, Morell MK, Li Z. The different effects of starch synthase IIa mutations or variation on endosperm amylose content of barley, wheat and rice are determined by the distribution of starch synthase I and starch branching enzyme IIb between the starch granule and amyloplast stroma. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2015; 128:1407-19. [PMID: 25893467 DOI: 10.1007/s00122-015-2515-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 04/03/2015] [Indexed: 05/26/2023]
Abstract
The distribution of starch synthase I and starch branching enzyme IIb between the starch granule and amyloplast stroma plays an important role in determining endosperm amylose content of cereal grains. Starch synthase IIa (SSIIa) catalyses the polymerisation of intermediate length glucan chains of amylopectin in the endosperm of cereals. Mutations of SSIIa genes in barley and wheat and inactive SSIIa variant in rice induce similar effects on the starch structure and the amylose content, but the severity of the phenotypes is different. This study compared the levels of transcripts and partitioning of proteins of starch synthase I (SSI) and starch branching enzyme IIb (SBEIIb) inside and outside the starch granules in the developing endosperms of these ssIIa mutants and inactive SSIIa variant. Pleiotropic effects on starch granule-bound proteins suggested that the different effects of SSIIa mutations on endosperm amylose content of barley, wheat and rice are determined by the distribution of SSI and SBEIIb between the starch granule and amyloplast stroma in cereals. Regulation of starch synthesis in ssIIa mutants and inactive SSIIa variant may be at post-translational level or the altered amylopectin structure deprives the affinity of SSI and SBEIIb to amylopectin.
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Affiliation(s)
- Jixun Luo
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia
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22
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Transitory and storage starch metabolism: two sides of the same coin? Curr Opin Biotechnol 2015; 32:143-148. [DOI: 10.1016/j.copbio.2014.11.026] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/25/2014] [Accepted: 11/28/2014] [Indexed: 11/19/2022]
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23
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Ahmed Z, Tetlow IJ, Ahmed R, Morell MK, Emes MJ. Protein-protein interactions among enzymes of starch biosynthesis in high-amylose barley genotypes reveal differential roles of heteromeric enzyme complexes in the synthesis of A and B granules. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 233:95-106. [PMID: 25711817 DOI: 10.1016/j.plantsci.2014.12.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 11/10/2014] [Accepted: 12/20/2014] [Indexed: 05/23/2023]
Abstract
The present study investigated the role of protein phosphorylation, and protein complex formation between key enzymes of amylopectin synthesis, in barley genotypes exhibiting "high amylose" phenotypes. Starch branching enzyme (SBE) down-regulated lines (ΔSBEIIa and ΔSBEIIb), starch synthase (SS)IIa (ssiia(-), sex6) and SSIII (ssiii(-), amo1) mutants were compared to a reference genotype, OAC Baxter. Down-regulation of either SBEIIa or IIb caused pleiotropic effects on SSI and starch phosphorylase (SP) and resulted in formation of novel protein complexes in which the missing SBEII isoform was substituted by SBEI and SP. In the ΔSBEIIb down-regulated line, soluble SP activity was undetectable. Nonetheless, SP was incorporated into a heteromeric protein complex with SBEI and SBEIIa and was readily detected in starch granules. In amo1, unlike other mutants, the data suggest that both SBEIIa and SBEIIb are in a protein complex with SSI and SSIIa. In the sex6 mutant no protein complexes involving SBEIIa or SBEIIb were detected in amyloplasts. Studies with Pro-Q Diamond revealed that GBSS, SSI, SSIIa, SBEIIb and SP are phosphorylated in their granule bound state. Alteration in the granule proteome in ΔSBEIIa and ΔSBEIIb lines, suggests that different protein complexes are involved in the synthesis of A and B granules.
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Affiliation(s)
- Zaheer Ahmed
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Ian J Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Regina Ahmed
- Food Futures National Research Flagship and Division of Plant Industry, CSIRO, Canberra ACT 2601, Australia.
| | | | - Michael J Emes
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
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24
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Luo J, Jobling SA, Millar A, Morell MK, Li Z. Allelic effects on starch structure and properties of six starch biosynthetic genes in a rice recombinant inbred line population. RICE (NEW YORK, N.Y.) 2015; 8:15. [PMID: 25844120 PMCID: PMC4385112 DOI: 10.1186/s12284-015-0046-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/28/2015] [Indexed: 05/04/2023]
Abstract
BACKGROUND The genetic diversity of six starch biosynthetic genes (Wx, SSI, SSIIa, SBEI, SBEIIa and SBEIIb) in indica and japonica rices opens an opportunity to produce a new variety with more favourable grain starch quality. However, there is limited information about the effects of these six gene allele combinations on starch structure and properties. A recombinant inbred line population from a cross between indica and japonica varieties offers opportunities to combine specific alleles of the six genes. RESULTS The allelic (indica vs japonica) effects of six starch biosynthetic genes on starch structure, functional properties, and abundance of granule bound proteins in rice grains were investigated in a common genetic background using a recombinant inbred line population. The indica Wx (Wxi) allele played a major role while indica SSI (SSIi), japonica SSIIa (SSIIaj) and indica SBEI (SBEIi) alleles had minor roles on the increase of amylose content. SSIIaj and japonica SBEIIb (SBEIIbj) alleles had a major and a minor role on high ratio of ∑DP ≤ 10 to ∑DP ≤ 24 fractions (RCL10/24), respectively. Both major alleles (Wxi and SSIIaj) reduced peak viscosity (PV), onset, peak and end gelatinization temperatures (GTs) of amylopectin, and increased amylose-lipid complex dissociation enthalpy compared with their counterpart-alleles, respectively. SBEIIai and SBEIIbj decreased PV, whereas SSIi and SBEIIbj decreased FV. SBEIi reduced setback viscosity and gelatinization enthalpy. RCL10/24 of chain length distribution in amylopectin is negatively correlated with PV and BD of paste property and GTs of thermal properties. We also report RILs with superior starch properties combining Wxi, SSIj, SSIIaj, SBEIi and SBEIIbj alleles. Additionally, a clear relation is drawn to starch biosynthetic gene alleles, starch structure, properties, and abundance of granule bound starch biosynthetic enzymes inside starch granules. CONCLUSIONS Rice Wxi and SSIIaj alleles play major roles, while SSIi, SBEIi, SBEIIai and SBEIIbj alleles have minor roles in the determination of starch properties between indica and japonica rice through starch structural modification. The combination of these alleles is a key factor for starch quality improvement in rice breeding programs. RCL10/24 value is critical for starch structure and property determination.
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Affiliation(s)
- Jixun Luo
- />CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
- />College of Medicine, Biology and Environment, Australian National University, Canberra, ACT 0200 Australia
| | - Stephen A Jobling
- />CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
| | - Anthony Millar
- />College of Medicine, Biology and Environment, Australian National University, Canberra, ACT 0200 Australia
| | - Matthew K Morell
- />CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
- />International Rice Research Institute, Maligaya, Muñoz, Nueva Ecija Philippines
| | - Zhongyi Li
- />CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
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25
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Luo J, Jobling SA, Millar A, Morell MK, Li Z. Allelic effects on starch structure and properties of six starch biosynthetic genes in a rice recombinant inbred line population. RICE (NEW YORK, N.Y.) 2015; 8:15. [PMID: 25844120 DOI: 10.1186./s12284-015-0046-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/28/2015] [Indexed: 05/22/2023]
Abstract
BACKGROUND The genetic diversity of six starch biosynthetic genes (Wx, SSI, SSIIa, SBEI, SBEIIa and SBEIIb) in indica and japonica rices opens an opportunity to produce a new variety with more favourable grain starch quality. However, there is limited information about the effects of these six gene allele combinations on starch structure and properties. A recombinant inbred line population from a cross between indica and japonica varieties offers opportunities to combine specific alleles of the six genes. RESULTS The allelic (indica vs japonica) effects of six starch biosynthetic genes on starch structure, functional properties, and abundance of granule bound proteins in rice grains were investigated in a common genetic background using a recombinant inbred line population. The indica Wx (Wxi) allele played a major role while indica SSI (SSIi), japonica SSIIa (SSIIaj) and indica SBEI (SBEIi) alleles had minor roles on the increase of amylose content. SSIIaj and japonica SBEIIb (SBEIIbj) alleles had a major and a minor role on high ratio of ∑DP ≤ 10 to ∑DP ≤ 24 fractions (RCL10/24), respectively. Both major alleles (Wxi and SSIIaj) reduced peak viscosity (PV), onset, peak and end gelatinization temperatures (GTs) of amylopectin, and increased amylose-lipid complex dissociation enthalpy compared with their counterpart-alleles, respectively. SBEIIai and SBEIIbj decreased PV, whereas SSIi and SBEIIbj decreased FV. SBEIi reduced setback viscosity and gelatinization enthalpy. RCL10/24 of chain length distribution in amylopectin is negatively correlated with PV and BD of paste property and GTs of thermal properties. We also report RILs with superior starch properties combining Wxi, SSIj, SSIIaj, SBEIi and SBEIIbj alleles. Additionally, a clear relation is drawn to starch biosynthetic gene alleles, starch structure, properties, and abundance of granule bound starch biosynthetic enzymes inside starch granules. CONCLUSIONS Rice Wxi and SSIIaj alleles play major roles, while SSIi, SBEIi, SBEIIai and SBEIIbj alleles have minor roles in the determination of starch properties between indica and japonica rice through starch structural modification. The combination of these alleles is a key factor for starch quality improvement in rice breeding programs. RCL10/24 value is critical for starch structure and property determination.
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Affiliation(s)
- Jixun Luo
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia ; College of Medicine, Biology and Environment, Australian National University, Canberra, ACT 0200 Australia
| | - Stephen A Jobling
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
| | - Anthony Millar
- College of Medicine, Biology and Environment, Australian National University, Canberra, ACT 0200 Australia
| | - Matthew K Morell
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia ; International Rice Research Institute, Maligaya, Muñoz, Nueva Ecija Philippines
| | - Zhongyi Li
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT 2601 Australia
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26
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Asai H, Abe N, Matsushima R, Crofts N, Oitome NF, Nakamura Y, Fujita N. Deficiencies in both starch synthase IIIa and branching enzyme IIb lead to a significant increase in amylose in SSIIa-inactive japonica rice seeds. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:5497-507. [PMID: 25071222 PMCID: PMC4157723 DOI: 10.1093/jxb/eru310] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 06/21/2014] [Accepted: 06/23/2014] [Indexed: 05/21/2023]
Abstract
Starch synthase (SS) IIIa has the second highest activity of the total soluble SS activity in developing rice endosperm. Branching enzyme (BE) IIb is the major BE isozyme, and is strongly expressed in developing rice endosperm. A mutant (ss3a/be2b) was generated from wild-type japonica rice which lacks SSIIa activity. The seed weight of ss3a/be2b was 74-94% of that of the wild type, whereas the be2b seed weight was 59-73% of that of the wild type. There were significantly fewer amylopectin short chains [degree of polymerization (DP) ≤13] in ss3a/be2b compared with the wild type. In contrast, the amount of long chains (DP ≥25) connecting clusters of amylopectin in ss3a/be2b was higher than in the wild type and lower than in be2b. The apparent amylose content of ss3a/be2b was 45%, which was >1.5 times greater than that of either ss3a or be2b. Both SSIIIa and BEIIb deficiencies led to higher activity of ADP-glucose pyrophosphorylase (AGPase) and granule-bound starch synthase I (GBSSI), which partly explains the high amylose content in the ss3a/be2b endosperm. The percentage apparent amylose content of ss3a and ss3a/be2b at 10 days after flowering (DAF) was higher than that of the wild type and be2b. At 20 DAF, amylopectin biosynthesis in be2b and ss3a/be2b was not observed, whereas amylose biosynthesis in these lines was accelerated at 30 DAF. These data suggest that the high amylose content in the ss3a/be2b mutant results from higher amylose biosynthesis at two stages, up to 20 DAF and from 30 DAF to maturity.
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Affiliation(s)
- Hiroki Asai
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
| | - Natsuko Abe
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
| | - Ryo Matsushima
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Naoko Crofts
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
| | - Naoko F Oitome
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
| | - Yasunori Nakamura
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
| | - Naoko Fujita
- Department of Biological Production, Akita Prefectural University, Akita City, Akita, 010-0195, Japan
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27
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Sparla F, Falini G, Botticella E, Pirone C, Talamè V, Bovina R, Salvi S, Tuberosa R, Sestili F, Trost P. New starch phenotypes produced by TILLING in barley. PLoS One 2014; 9:e107779. [PMID: 25271438 PMCID: PMC4182681 DOI: 10.1371/journal.pone.0107779] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 08/15/2014] [Indexed: 01/08/2023] Open
Abstract
Barley grain starch is formed by amylose and amylopectin in a 1∶3 ratio, and is packed into granules of different dimensions. The distribution of granule dimension is bimodal, with a majority of small spherical B-granules and a smaller amount of large discoidal A-granules containing the majority of the starch. Starch granules are semi-crystalline structures with characteristic X-ray diffraction patterns. Distinct features of starch granules are controlled by different enzymes and are relevant for nutritional value or industrial applications. Here, the Targeting-Induced Local Lesions IN Genomes (TILLING) approach was applied on the barley TILLMore TILLING population to identify 29 new alleles in five genes related to starch metabolism known to be expressed in the endosperm during grain filling: BMY1 (Beta-amylase 1), GBSSI (Granule Bound Starch Synthase I), LDA1 (Limit Dextrinase 1), SSI (Starch Synthase I), SSIIa (Starch Synthase IIa). Reserve starch of nine M3 mutant lines carrying missense or nonsense mutations was analysed for granule size, crystallinity and amylose/amylopectin content. Seven mutant lines presented starches with different features in respect to the wild-type: (i) a mutant line with a missense mutation in GBSSI showed a 4-fold reduced amylose/amylopectin ratio; (ii) a missense mutations in SSI resulted in 2-fold increase in A:B granule ratio; (iii) a nonsense mutation in SSIIa was associated with shrunken seeds with a 2-fold increased amylose/amylopectin ratio and different type of crystal packing in the granule; (iv) the remaining four missense mutations suggested a role of LDA1 in granule initiation, and of SSIIa in determining the size of A-granules. We demonstrate the feasibility of the TILLING approach to identify new alleles in genes related to starch metabolism in barley. Based on their novel physicochemical properties, some of the identified new mutations may have nutritional and/or industrial applications.
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Affiliation(s)
- Francesca Sparla
- Department of Pharmacy and Biotechnology FABIT, University of Bologna, Bologna, Italy
| | - Giuseppe Falini
- Department of Chemistry “G. Ciamician”, University of Bologna, Bologna, Italy
| | - Ermelinda Botticella
- Department of Agriculture, Forestry, Nature & Energy, University of Tuscia, Viterbo, Italy
| | - Claudia Pirone
- Department of Pharmacy and Biotechnology FABIT, University of Bologna, Bologna, Italy
| | - Valentina Talamè
- Department of Agricultural Sciences, University of Bologna, Bologna, Italy
| | - Riccardo Bovina
- Department of Agricultural Sciences, University of Bologna, Bologna, Italy
| | - Silvio Salvi
- Department of Agricultural Sciences, University of Bologna, Bologna, Italy
| | - Roberto Tuberosa
- Department of Agricultural Sciences, University of Bologna, Bologna, Italy
| | - Francesco Sestili
- Department of Agriculture, Forestry, Nature & Energy, University of Tuscia, Viterbo, Italy
| | - Paolo Trost
- Department of Pharmacy and Biotechnology FABIT, University of Bologna, Bologna, Italy
- * E-mail:
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Brust H, Lehmann T, D'Hulst C, Fettke J. Analysis of the functional interaction of Arabidopsis starch synthase and branching enzyme isoforms reveals that the cooperative action of SSI and BEs results in glucans with polymodal chain length distribution similar to amylopectin. PLoS One 2014; 9:e102364. [PMID: 25014622 PMCID: PMC4094495 DOI: 10.1371/journal.pone.0102364] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/18/2014] [Indexed: 01/17/2023] Open
Abstract
Starch synthase (SS) and branching enzyme (BE) establish the two glycosidic linkages existing in starch. Both enzymes exist as several isoforms. Enzymes derived from several species were studied extensively both in vivo and in vitro over the last years, however, analyses of a functional interaction of SS and BE isoforms are missing so far. Here, we present data from in vitro studies including both interaction of leaf derived and heterologously expressed SS and BE isoforms. We found that SSI activity in native PAGE without addition of glucans was dependent on at least one of the two BE isoforms active in Arabidopsis leaves. This interaction is most likely not based on a physical association of the enzymes, as demonstrated by immunodetection and native PAGE mobility analysis of SSI, BE2, and BE3. The glucans formed by the action of SSI/BEs were analysed using leaf protein extracts from wild type and be single mutants (Atbe2 and Atbe3 mutant lines) and by different combinations of recombinant proteins. Chain length distribution (CLD) patterns of the formed glucans were irrespective of SSI and BE isoforms origin and still independent of assay conditions. Furthermore, we show that all SS isoforms (SSI-SSIV) were able to interact with BEs and form branched glucans. However, only SSI/BEs generated a polymodal distribution of glucans which was similar to CLD pattern detected in amylopectin of Arabidopsis leaf starch. We discuss the impact of the SSI/BEs interplay for the CLD pattern of amylopectin.
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Affiliation(s)
- Henrike Brust
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam-Golm, Germany
- * E-mail:
| | - Tanja Lehmann
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam-Golm, Germany
| | - Christophe D'Hulst
- Unité de Glycobiologie Structurale et Fonctionnelle, Université Lille1, Villeneuve d'Ascq, France
| | - Joerg Fettke
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam-Golm, Germany
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29
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McMaugh SJ, Thistleton JL, Anschaw E, Luo J, Konik-Rose C, Wang H, Huang M, Larroque O, Regina A, Jobling SA, Morell MK, Li Z. Suppression of starch synthase I expression affects the granule morphology and granule size and fine structure of starch in wheat endosperm. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:2189-201. [PMID: 24634486 PMCID: PMC3991748 DOI: 10.1093/jxb/eru095] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Studies in Arabidopsis and rice suggest that manipulation of starch synthase I (SSI) expression in wheat may lead to the production of wheat grains with novel starch structure and properties. This work describes the suppression of SSI expression in wheat grains using RNAi technology, which leads to a low level of enzymatic activity for SSI in the developing endosperm, and a low abundance of SSI protein inside the starch granules of mature grains. The amylopectin fraction of starch from the SSI suppressed lines showed an increased frequency of very short chains (degree of polymerization, dp 6 and 7), a lower proportion of short chains (dp 8-12), and more intermediate chains (dp 13-20) than in the grain from their negative segregant lines. In the most severely affected line, amylose content was significantly increased, the morphology of starch granules was changed, and the proportion of B starch granules was significantly reduced. The change of the fine structure of the starch in the SSI-RNAi suppression lines alters the gelatinization temperature, swelling power, and viscosity of the starch. This work demonstrates that the roles of SSI in the determination of starch structure and properties are similar among different cereals and Arabidopsis.
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Affiliation(s)
- Stephen J McMaugh
- CSIRO Food Future Flagship, GPO Box 1600, Canberra, ACT 2601, Australia
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30
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Lafiandra D, Riccardi G, Shewry PR. Improving cereal grain carbohydrates for diet and health. J Cereal Sci 2014; 59:312-326. [PMID: 24966450 PMCID: PMC4064937 DOI: 10.1016/j.jcs.2014.01.001] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 12/20/2013] [Accepted: 01/01/2014] [Indexed: 12/20/2022]
Abstract
Starch and cell wall polysaccharides (dietary fibre) of cereal grains contribute to the health benefits associated with the consumption of whole grain cereal products, including reduced risk of obesity, type 2 diabetes, cardiovascular disease and colorectal cancer. The physiological bases for these effects are reviewed in relation to the structures and physical properties of the polysaccharides and their behaviour (including digestion and fermentation) in the gastro-intestinal tract. Strategies for modifying the content and composition of grain polysaccharides to increase their health benefits are discussed, including exploiting natural variation and using mutagenesis and transgenesis to generate further variation. These studies will facilitate the development of new types of cereals and cereal products to face the major health challenges of the 21st century.
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Affiliation(s)
- Domenico Lafiandra
- Università degli Studi della Tuscia, Department of Agriculture, Forestry, Nature and Energy, Via S.C. De Lellis, Viterbo 01100, Italy
| | - Gabriele Riccardi
- Università degli Studi di Napoli Federico II, Department of Clinical Medicine and Surgery, Via Pansini 5, Napoli 80131, Italy
| | - Peter R. Shewry
- Department of Plant Biology and Crop Science, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK
- School of Agriculture, Policy and Development, University of Reading, Earley Gate, Whiteknights Road, Reading RG6 6AR, UK
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31
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Shu X, Rasmussen SK. Quantification of amylose, amylopectin, and β-glucan in search for genes controlling the three major quality traits in barley by genome-wide association studies. FRONTIERS IN PLANT SCIENCE 2014; 5:197. [PMID: 24860587 PMCID: PMC4030205 DOI: 10.3389/fpls.2014.00197] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 04/23/2014] [Indexed: 05/20/2023]
Abstract
Genome-wide association studies (GWAS) for amylose, amylopectin and β-glucan concentration in a collection of 254 European spring barley varieties allowed to identify 20, 17, and 21 single nucleotide polymorphic (SNP) markers, respectively, associated with these important grain quality traits. Negative correlations between the content of amylose and β-glucan (R = -0.62, P < 0.01) and amylopectin and β-glucan (R = -0.487, P < 0.01) were found in this large collection of spring barley varieties. Besides HvCslF6, amo1 and AGPL2, sex6, and waxy were identified among the major genes responsible for β-glucan, amylose and amylopectin content, respectively. Several minor genes like HvGSL4, HvGSL3, and HvCesA6, PWD were also detected by GWAS for the first time. Furthermore, the gene encoding β-fructofuranosidase, located on the short arm of chromosome 7H at 1.49 cM, and SRF6, encoding "leucine-rich repeat receptor kinase protein" on chromosome 2 H, are proposed to be new candidate genes for amylopectin formation in barley endosperm. Several of the associated SNPs on chromosome 1, 5, 6, and 7H mapped to overlapping regions containing QTLs and genes controlling the three grain constituents. In particular chromosomes 5 and 7H carry many QTLs controlling barley grain quality. Amylose, amylopectin and β-glucan were interacted among each other through a metabolic network connected by UDP showing pleiotropic effects. Taken together, these results showed that cereal quality traits related each other and regulated through an interaction network, the identified major genes and genetic regions for amylose, amylopectin and β-glucan is a helpful for further research on carbohydrates and barley breeding.
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Affiliation(s)
- Xiaoli Shu
- Key Laboratory of the Ministry of Agriculture for Nuclear Agricultural Sciences, Institute of Nuclear Agricultural Sciences, Zhejiang UniversityHangzhou, China
- Department of Plant and Environmental Sciences, Faculty of Sciences, University of CopenhagenFrederiksberg, Denmark
| | - Søren K. Rasmussen
- Department of Plant and Environmental Sciences, Faculty of Sciences, University of CopenhagenFrederiksberg, Denmark
- *Correspondence: Søren K. Rasmussen, Department of Plant and Environmental Sciences, Faculty of Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark e-mail:
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32
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Zhu F, Bertoft E, Källman A, Myers AM, Seetharaman K. Molecular structure of starches from maize mutants deficient in starch synthase III. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:9899-907. [PMID: 23967805 DOI: 10.1021/jf402090f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Molecular structures of starches from dull1 maize mutants deficient in starch synthase III (SSIII) with a common genetic background (W64A) were characterized and compared with the wild type. Amylose content with altered structure was higher in the nonwaxy mutants (25.4-30.2%) compared to the wild type maize (21.5%) as revealed by gel permeation chromatography. Superlong chains of the amylopectin component were found in all nonwaxy samples. Unit chain length distribution of amylopectins and their φ,β-limit dextrins (reflecting amylopectin internal structure) from dull1 mutants were also characterized by anion-exchange chromatography after debranching. Deficiency of SSIII led to an increased amount of short chains (DP ≤36 in amylopectin), whereas the content of long chains decreased from 8.4% to between 3.1 and 3.7% in both amylopectin and φ,β-limit dextrins. Moreover, both the external and internal chain lengths decreased, suggesting a difference in their cluster structures. Whereas the molar ratio of A:B-chains was similar in all samples (1.1-1.2), some ratios of chain categories were affected by the absence of SSIII, notably the ratio of "fingerprint" A-chains to "clustered" A-chains. This study highlighted the relationship between SSIII and the internal molecular structure of maize starch.
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Affiliation(s)
- Fan Zhu
- School of Chemical Sciences, University of Auckland , Private Bag 92019, Auckland 1142, New Zealand
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33
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Källman A, Bertoft E, Koch K, Åman P, Andersson R. On the interconnection of clusters and building blocks in barley amylopectin. Int J Biol Macromol 2013; 55:75-82. [DOI: 10.1016/j.ijbiomac.2012.12.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/10/2012] [Accepted: 12/14/2012] [Indexed: 11/25/2022]
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34
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Glucan affinity of starch synthase IIa determines binding of starch synthase I and starch-branching enzyme IIb to starch granules. Biochem J 2012; 448:373-87. [DOI: 10.1042/bj20120573] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The sugary-2 mutation in maize (Zea mays L.) is a result of the loss of catalytic activity of the endosperm-specific SS (starch synthase) IIa isoform causing major alterations to amylopectin architecture. The present study reports a biochemical and molecular analysis of an allelic variant of the sugary-2 mutation expressing a catalytically inactive form of SSIIa and sheds new light on its central role in protein–protein interactions and determination of the starch granule proteome. The mutant SSIIa revealed two amino acid substitutions, one being a highly conserved residue (Gly522→Arg) responsible for the loss of catalytic activity and the inability of the mutant SSIIa to bind to starch. Analysis of protein–protein interactions in sugary-2 amyloplasts revealed the same trimeric assembly of soluble SSI, SSIIa and SBE (starch-branching enzyme) IIb found in wild-type amyloplasts, but with greatly reduced activities of SSI and SBEIIb. Chemical cross-linking studies demonstrated that SSIIa is at the core of the complex, interacting with SSI and SBEIIb, which do not interact directly with each other. The sugary-2 mutant starch granules were devoid of amylopectin-synthesizing enzymes, despite the fact that the respective affinities of SSI and SBEIIb from sugary-2 for amylopectin were the same as observed in wild-type. The data support a model whereby granule-bound proteins involved in amylopectin synthesis are partitioned into the starch granule as a result of their association within protein complexes, and that SSIIa plays a crucial role in trafficking SSI and SBEIIb into the granule matrix.
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35
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Asare EK, Båga M, Rossnagel BG, Chibbar RN. Polymorphism in the barley granule bound starch synthase 1 (gbss1) gene associated with grain starch variant amylose concentration. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:10082-10092. [PMID: 22950712 DOI: 10.1021/jf302291t] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Granule bound starch synthase 1 (GBSS1) accumulation within starch granules and structure of Gbss1 alleles were determined for nine barley ( Hordeum vulgare L.) genotypes producing amylose-free (undetectable), near-waxy (1.6-4.5%), normal (25.8%), and increased (38.0-40.8%) amylose grain starches. Compared to normal starch granules, GBSS1 accumulation was severely reduced in three near-waxy, slightly reduced in two waxy, and slightly elevated in three increased amylose starches. Gbss1 nucleotide sequence analysis for the nine genotypes distinguished them into three Gbss1 groups with several single-nucleotide polymorphisms. A new unique Q312H substitution within GBSS1 was discovered in near-waxy genotype SB94912 with reduced amylose (1.6%) concentration relative to the other two near-waxy lines, CDC Rattan and CDC Candle (4.5%). The two waxy genotype GBSS1 showed a previously described D287V change for CDC Alamo and a new G513W change for CDC Fibar. Both amino acid alterations are conserved residues within starch synthase domains involved in glucan interaction. The increased amylose genotypes showed several unique nucleotide changes within the second and fourth Gbss1 introns, but only SB94893 GBSS1 showed a unique amino acid substitution, A250T in exon 6. The Gbss1 nucleotide differences were used to design genetic markers to monitor Gbss1 alleles in genotypes with various amylose grain starches.
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Affiliation(s)
- Eric K Asare
- Department of Plant Sciences, University of Saskatchewan , 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, Canada
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36
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Crofts N, Abe K, Aihara S, Itoh R, Nakamura Y, Itoh K, Fujita N. Lack of starch synthase IIIa and high expression of granule-bound starch synthase I synergistically increase the apparent amylose content in rice endosperm. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2012; 193-194:62-69. [PMID: 22794919 DOI: 10.1016/j.plantsci.2012.05.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 05/09/2012] [Accepted: 05/10/2012] [Indexed: 05/18/2023]
Abstract
Rice endosperm starch is composed of 0-30% linear amylose, which is entirely synthesized by granule-bound starch synthase I (GBSSI: encoded by Waxy, Wx). The remainder consists of branched amylopectin and is elongated by multiple starch synthases (SS) including SSI, IIa and IIIa. Typical japonica rice lacks active SSIIa and contains a low expressing Wx(b) causing a low amylose content (ca. 20%). WAB2-3 (SS3a/Wx(a)) lines generated by the introduction of a dominant indica Wx(a) into a japonica waxy mutant (SS3a/wx) exhibit elevated GBSSI and amylose content (ca. 25%). The japonica ss3a mutant (ss3a/Wx(b)) shows a high amylose content (ca. 30%), decreased long chains of amylopectin and increased GBSSI levels. To investigate the functional relationship between the ss3a and Wx(a) genes, the ss3a/Wx(a) line was generated by crossing ss3a/Wx(b) with SS3a/Wx(a), and the starch properties of this line were examined. The results show that the apparent amylose content of the ss3a/Wx(a) line was increased (41.3%) compared to the parental lines. However, the GBSSI quantity did not increase compared to the SS3a/Wx(a) line. The amylopectin branch structures were similar to the ss3a/Wx(b) mutant. Therefore, Wx(a) and ss3a synergistically increase the apparent amylose content in rice endosperm, and the possible reasons for this increase are discussed.
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Affiliation(s)
- Naoko Crofts
- Department of Biological Production, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita City, Akita 010-0195, Japan.
| | - Katsumi Abe
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
| | - Satomi Aihara
- Department of Biological Production, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita City, Akita 010-0195, Japan.
| | - Rumiko Itoh
- Department of Biological Production, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita City, Akita 010-0195, Japan. i---love--
| | - Yasunori Nakamura
- Department of Biological Production, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita City, Akita 010-0195, Japan.
| | - Kimiko Itoh
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan; Center for Transdisciplinary Research Institute, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
| | - Naoko Fujita
- Department of Biological Production, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita City, Akita 010-0195, Japan.
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37
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Regina A, Blazek J, Gilbert E, Flanagan BM, Gidley MJ, Cavanagh C, Ral JP, Larroque O, Bird AR, Li Z, Morell MK. Differential effects of genetically distinct mechanisms of elevating amylose on barley starch characteristics. Carbohydr Polym 2012; 89:979-91. [PMID: 24750889 DOI: 10.1016/j.carbpol.2012.04.054] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 04/11/2012] [Accepted: 04/12/2012] [Indexed: 11/25/2022]
Abstract
The relationships between starch structure and functionality are important in underpinning the industrial and nutritional utilisation of starches. In this work, the relationships between the biosynthesis, structure, molecular organisation and functionality have been examined using a series of defined genotypes in barley with low (<20%), standard (20-30%), elevated (30-50%) and high (>50%) amylose starches. A range of techniques have been employed to determine starch physical features, higher order structure and functionality. The two genetic mechanisms for generating high amylose contents (down-regulation of branching enzymes and starch synthases, respectively) yielded starches with very different amylopectin structures but similar gelatinisation and viscosity properties driven by reduced granular order and increased amylose content. Principal components analysis (PCA) was used to elucidate the relationships between genotypes and starch molecular structure and functionality. Parameters associated with granule order (PC1) accounted for a large percentage of the variance (57%) and were closely related to amylose content. Parameters associated with amylopectin fine structure accounted for 18% of the variance but were less closely aligned to functionality parameters.
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Affiliation(s)
- Ahmed Regina
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Jaroslav Blazek
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Elliot Gilbert
- Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Bernadine M Flanagan
- Centre for Nutrition and Food Sciences, University of Queensland, St. Lucia, Qld 4072, Australia
| | - Michael J Gidley
- Centre for Nutrition and Food Sciences, University of Queensland, St. Lucia, Qld 4072, Australia
| | - Colin Cavanagh
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Jean-Philippe Ral
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Oscar Larroque
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Anthony R Bird
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Food and Nutritional Sciences, Kintore Avenue, Adelaide, SA, Australia
| | - Zhongyi Li
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Matthew K Morell
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
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