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Tang W, Chen H, Zhang S, Tang J, Lin J, Fang X, Chen G, Zhang Y. A Novel Allele in the Promoter of Wx Decreases Gene Expression and Confers Lower Apparent Amylose Contents in Japonica Rice ( Oryza sativa L.). PLANTS (BASEL, SWITZERLAND) 2024; 13:745. [PMID: 38475591 DOI: 10.3390/plants13050745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/02/2024] [Accepted: 03/05/2024] [Indexed: 03/14/2024]
Abstract
Wx is the key gene that controls amylose content (AC), and various alleles have been found in rice populations. Wxb is the major allele in japonica and produces moderate AC (15~18%). It was recently found that editing the promoter of Wx could produce a series of alleles that have different Wx activities. Although some studies have edited the promoter, few studies have focused on the natural variations in Wx. Here, we used the Rice3K database to investigate variations in the Wx promoter and found that the allele Wx1764178 (A/G) has a higher LD (linkage disequilibrium) with the two key SNPs (1765751, T/G; 1768006, A/C), which could produce different Wx alleles and influence AC, as reported previously. Further study showed that the Wx1764178 allele (A/G) is functional and influences the expression of Wx positively. Editing the A allele using CRISPR‒Cas9 produced 36 and 3 bp deletions and caused a decrease in the expression of Wx. The apparent amylose content (AAC) in the edited lines was decreased by 7.09% and 11.50% compared with that of the wild type, which was the japonica variety Nipponbare with Wxb and the A allele at 1764178, while a complementary line with the G allele showed a lower AAC than the A allele with no effect on other agronomic traits. The AAC of the edited lines showed a higher increase than that of the wild type (Nipponbare, Wxb) in low-nitrogen conditions relative to high-nitrogen conditions. We also developed a dCAPS marker to identify the allele and found that the G allele has widely been used (82.95%) in japonica-bred varieties from Jiangsu Province, China. Overall, we found a functional allele (Wx1764178, A/G) in the Wx promoter that could affect AAC in japonica cultivars and be developed as markers for quality improvement in rice breeding programs.
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Affiliation(s)
- Weijie Tang
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Haiyuan Chen
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Suobing Zhang
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Jun Tang
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Jing Lin
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Xianwen Fang
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
| | - Gaoming Chen
- State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Centre for Modern Crop Production, Nanjing Agricultural University, Nanjing 210095, China
| | - Yunhui Zhang
- Provincial Key Laboratory of Agrobiology, Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Zhongshan Biological Breeding Laboratory, Nanjing 210014, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
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Zhang H, Zhang J, Xu P, Li M, Li Y. Insertion of a miniature inverted-repeat transposable element into the promoter of OsTCP4 results in more tillers and a lower grain size in rice. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:1421-1436. [PMID: 37988625 DOI: 10.1093/jxb/erad467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 11/21/2023] [Indexed: 11/23/2023]
Abstract
A class I PCF type protein, TCP4, was identified as a transcription factor associated with both grain size and tillering through a DNA pull-down-MS assay combined with a genome-wide association study. This transcription factor was found to have a significant role in the variations among the 533 rice accessions, dividing them into two main subspecies. A Tourist-like miniature inverted-repeat transposable element (MITE) was discovered in the promoter of TCP4 in japonica/geng accessions (TCP4M+), which was found to suppress the expression of TCP4 at the transcriptional level. The MITE-deleted haplotype (TCP4M-) was mainly found in indica/xian accessions. ChIP-qPCR and EMSA demonstrated the binding of TCP4 to promoters of grain reservoir genes such as SSIIa and Amy3D in vivo and in vitro, respectively. The introduction of the genomic sequence of TCP4M+ into different TCP4M- cultivars was found to affect the expression of TCP4 in the transgenic rice, resulting in decreased expression of its downstream target gene SSIIa, increased tiller number, and decreased seed length. This study revealed that a Tourist-like MITE contributes to subspecies divergence by regulating the expression of TCP4 in response to environmental pressure, thus influencing source-sink balance by regulating starch biosynthesis in rice.
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Affiliation(s)
- Hui Zhang
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, Hubei 430070, China
| | - Juncheng Zhang
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, Hubei 430070, China
| | - Pengkun Xu
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, Hubei 430070, China
| | - Ming Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430026, China
| | - Yibo Li
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, Hubei 430070, China
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3
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Jiang J, Song S, Hu C, Jing C, Xu Q, Li X, Zhang M, Hai M, Shen J, Zhang Y, Wang D, Dang X. QTL Detection and Candidate Gene Identification for Eating and Cooking Quality Traits in Rice ( Oryza sativa L.) via a Genome-Wide Association Study. Int J Mol Sci 2024; 25:630. [PMID: 38203801 PMCID: PMC10779416 DOI: 10.3390/ijms25010630] [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: 11/20/2023] [Revised: 12/25/2023] [Accepted: 12/30/2023] [Indexed: 01/12/2024] Open
Abstract
The eating and cooking quality (ECQ) directly affects the taste of rice, being closely related to factors such as gelatinization temperature (GT), gel consistency (GC) and amylose content (AC). Mining the quantitative trait loci (QTLs), and gene loci controlling ECQ-related traits is vital. A genome-wide association study on ECQ-related traits was conducted, combining 1.2 million single nucleotide polymorphisms (SNPs) with the phenotypic data of 173 rice accessions. Two QTLs for GT, one for GC and five for AC were identified, of which two were found in previously reported genes, and six were newly found. There were 28 positional candidate genes in the region of qAC11. Based on a linkage disequilibrium (LD) analysis, three candidate genes were screened within the LD region associated with AC. There were significant differences between the haplotypes of LOC_Os11g10170, but no significant differences were found for the other two genes. The qRT-PCR results showed that the gene expression levels in the accessions with high ACs were significantly larger than those in the accessions with low ACs at 35d and 42d after flowering. Hap 2 and Hap 3 of LOC_Os11g10170 reduced the AC by 13.09% and 10.77%, respectively. These results provide a theoretical and material basis for improving the ECQ of rice.
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Affiliation(s)
- Jianhua Jiang
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Shaojie Song
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Changmin Hu
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Chunyu Jing
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Qing Xu
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Xinru Li
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Mengyuan Zhang
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Mei Hai
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Jiaming Shen
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China
| | - Ying Zhang
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Dezheng Wang
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Xiaojing Dang
- Anhui Province Key Laboratory of Rice Genetics and Breeding (Rice Research Institute), Anhui Academy of Agricultural Sciences, Hefei 230031, China
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Wang L, Liu L, Zhao J, Li C, Wu H, Zhao H, Wu Q. Granule-bound starch synthase in plants: Towards an understanding of their evolution, regulatory mechanisms, applications, and perspectives. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 336:111843. [PMID: 37648115 DOI: 10.1016/j.plantsci.2023.111843] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/01/2023]
Abstract
Amylose content (AC) is a significant quality trait in starchy crops, affecting their processing and application by the food and non-food industries. Therefore, fine-tuning AC in these crops has become a focus for breeders. Granule-bound starch synthase (GBSS) is the core enzyme that directly determines the AC levels. Several excellent reviews have summarized key progress in various aspects of GBSS research in recent years, but they mostly focus on cereals. Herein, we provide an in-depth review of GBSS research in monocots and dicots, focusing on the molecular characteristics, evolutionary relationships, expression patterns, molecular regulation mechanisms, and applications. We also discuss future challenges and directions for controlling AC in starchy crops, and found simultaneously increasing both the PTST and GBSS gene expression levels may be an effective strategy to increase amylose content.
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Affiliation(s)
- Lei Wang
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Linling Liu
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Jiali Zhao
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Chenglei Li
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Huala Wu
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Haixia Zhao
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China
| | - Qi Wu
- College of Life Science, Sichuan Agricultural University, No. 46, Xinkang Road, Ya'an 625014, China.
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Sudan J, Urwat U, Farooq A, Pakhtoon MM, Zaffar A, Naik ZA, Batool A, Bashir S, Mansoor M, Sofi PA, Sofi NUR, Shikari AB, Khan MK, Hossain MA, Henry RJ, Zargar SM. Explicating genetic architecture governing nutritional quality in pigmented rice. PeerJ 2023; 11:e15901. [PMID: 37719119 PMCID: PMC10501373 DOI: 10.7717/peerj.15901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/25/2023] [Indexed: 09/19/2023] Open
Abstract
Rice is one of the most important staple plant foods that provide a major source of calories and nutrients for tackling the global hunger index especially in developing countries. In terms of nutritional profile, pigmented rice grains are favoured for their nutritional and health benefits. The pigmented rice varieties are rich sources of flavonoids, anthocyanin and proanthocyanidin that can be readily incorporated into diets to help address various lifestyle diseases. However, the cultivation of pigmented rice is limited due to low productivity and unfavourable cooking qualities. With the advances in genome sequencing, molecular breeding, gene expression analysis and multi-omics approaches, various attempts have been made to explore the genetic architecture of rice grain pigmentation. In this review, we have compiled the current state of knowledge of the genetic architecture and nutritional value of pigmentation in rice based upon the available experimental evidence. Future research areas that can help to deepen our understanding and help in harnessing the economic and health benefits of pigmented rice are also explored.
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Affiliation(s)
- Jebi Sudan
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Uneeb Urwat
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Asmat Farooq
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Mohammad Maqbool Pakhtoon
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Aaqif Zaffar
- Division of Genetics and Plant Breeding, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (J&K), Srinagar, Jammu and Kashmir, India
| | - Zafir Ahmad Naik
- Division of Genetics and Plant Breeding, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (J&K), Srinagar, Jammu and Kashmir, India
| | - Aneesa Batool
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Saika Bashir
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Madeeha Mansoor
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Parvaze A. Sofi
- Division of Genetics and Plant Breeding, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (J&K), Srinagar, Jammu and Kashmir, India
| | - Najeebul Ul Rehman Sofi
- Mountain Research Centre for Field Crops, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Khudwani, Jammu and Kashmir, India
| | - Asif B. Shikari
- Division of Genetics and Plant Breeding, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (J&K), Srinagar, Jammu and Kashmir, India
| | - Mohd. Kamran Khan
- Department of Soil Sciences and Plant Nutrition, Faculty of Agriculture, Selcuk University, Konya, Turkey
| | - Mohammad Anwar Hossain
- Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | - Robert J. Henry
- Queensland Alliance for Agriculture and Food Innovation, Queensland University, Brisbane, Australia
| | - Sajad Majeed Zargar
- Proteomics Lab, Division of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, Jammu and Kashmir, India
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Tiozon RJN, Fettke J, Sreenivasulu N, Fernie AR. More than the main structural genes: Regulation of resistant starch formation in rice endosperm and its potential application. JOURNAL OF PLANT PHYSIOLOGY 2023; 285:153980. [PMID: 37086697 DOI: 10.1016/j.jplph.2023.153980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/07/2023] [Accepted: 04/03/2023] [Indexed: 05/03/2023]
Abstract
In the past decade, research on resistant starch has evoked interest due to the prevention and inhibition of chronic human diseases, such as diabetes, cancer, and obesity. Increasing the amylose content (AC) and resistant starch (RS) has been pivotal in improving the nutritional benefit of rice. However, the exact mechanism of RS formation is complex due to interconnected genetic factors regulating amylose-amylopectin variation. In this review, we discussed the regulatory factors influencing the RS formation centered on the transcription, post-transcriptional, and post-translational processes. Furthermore, we described the developments in RS and AC levels in rice compared with other high RS cereals. Briefly, we enumerated potential applications of high RS mutants in health, medical, and other industries. We contest that the information captured herein can be deployed for marker-assisted breeding and precision breeding techniques through genome editing to improve rice varieties with enhanced RS content.
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Affiliation(s)
- Rhowell Jr N Tiozon
- Consumer Driven Grain Quality and Nutrition Unit, Rice Breeding and Innovation Platform, International Rice Research Institute, Los Baños, 4030, Philippines; Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany
| | - Joerg Fettke
- Biopolymer Analytics, Institute of Biochemistry and Biology, University of Potsdam, Potsdam-Golm, Germany
| | - Nese Sreenivasulu
- Consumer Driven Grain Quality and Nutrition Unit, Rice Breeding and Innovation Platform, International Rice Research Institute, Los Baños, 4030, Philippines
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany.
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7
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Molecular bases of rice grain size and quality for optimized productivity. Sci Bull (Beijing) 2023; 68:314-350. [PMID: 36710151 DOI: 10.1016/j.scib.2023.01.026] [Citation(s) in RCA: 39] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/30/2022] [Accepted: 01/16/2023] [Indexed: 01/19/2023]
Abstract
The accomplishment of further optimization of crop productivity in grain yield and quality is a great challenge. Grain size is one of the crucial determinants of rice yield and quality; all of these traits are typical quantitative traits controlled by multiple genes. Research advances have revealed several molecular and developmental pathways that govern these traits of agronomical importance. This review provides a comprehensive summary of these pathways, including those mediated by G-protein, the ubiquitin-proteasome system, mitogen-activated protein kinase, phytohormone, transcriptional regulators, and storage product biosynthesis and accumulation. We also generalize the excellent precedents for rice variety improvement of grain size and quality, which utilize newly developed gene editing and conventional gene pyramiding capabilities. In addition, we discuss the rational and accurate breeding strategies, with the aim of better applying molecular design to breed high-yield and superior-quality varieties.
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Li Y, Karim H, Wang B, Guzmán C, Harwood W, Xu Q, Zhang Y, Tang H, Jiang Y, Qi P, Deng M, Ma J, Lan J, Wang J, Chen G, Lan X, Wei Y, Zheng Y, Jiang Q. Regulation of Amylose Content by Single Mutations at an Active Site in the Wx-B1 Gene in a Tetraploid Wheat Mutant. Int J Mol Sci 2022; 23:ijms23158432. [PMID: 35955567 PMCID: PMC9368913 DOI: 10.3390/ijms23158432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/21/2022] [Accepted: 07/26/2022] [Indexed: 01/15/2023] Open
Abstract
The granule-bound starch synthase I (GBSSI) encoded by the waxy gene is responsible for amylose synthesis in the endosperm of wheat grains. In the present study, a novel Wx-B1 null mutant line, M3-415, was identified from an ethyl methanesulfonate-mutagenized population of Chinese tetraploid wheat landrace Jianyangailanmai (LM47). The gene sequence indicated that the mutated Wx-B1 encoded a complete protein; this protein was incompatible with the protein profile obtained using sodium dodecyl sulfate–polyacrylamide gel electrophoresis, which showed the lack of Wx-B1 protein in the mutant line. The prediction of the protein structure showed an amino acid substitution (G470D) at the edge of the ADPG binding pocket, which might affect the binding of Wx-B1 to starch granules. Site-directed mutagenesis was further performed to artificially change the amino acid at the sequence position 469 from alanine (A) to threonine (T) (A469T) downstream of the mutated site in M3-415. Our results indicated that a single amino acid mutation in Wx-B1 reduces its activity by impairing its starch-binding capacity. The present study is the first to report the novel mechanism underlying Wx-1 deletion in wheat; moreover, it provided new insights into the inactivation of the waxy gene and revealed that fine regulation of wheat amylose content is possible by modifying the GBSSI activity.
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Affiliation(s)
- Yulong Li
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Hassan Karim
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Bang Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Carlos Guzmán
- Departamento de Genética, Escuela Técnica Superior de Ingeniería Agronómica y de Montes, Edificio Gregor Mendel, Campus de Rabanales, Universidad de Córdoba, 14071 Cordoba, Spain;
| | - Wendy Harwood
- John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK;
| | - Qiang Xu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Yazhou Zhang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Huaping Tang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Yunfeng Jiang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Pengfei Qi
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Mei Deng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Jian Ma
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Jingyu Lan
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Jirui Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Guoyue Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Xiujin Lan
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Yuming Wei
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Youliang Zheng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Qiantao Jiang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (Y.L.); (H.K.); (B.W.); (Q.X.); (Y.Z.); (H.T.); (Y.J.); (P.Q.); (M.D.); (J.M.); (J.L.); (J.W.); (G.C.); (X.L.); (Y.W.); (Y.Z.)
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
- Correspondence: ; Tel.: +86-28-8629-0958; Fax: +86-28-8265-0350
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9
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Shen L, Li J, Li Y. Resistant starch formation in rice: Genetic regulation and beyond. PLANT COMMUNICATIONS 2022; 3:100329. [PMID: 35576157 PMCID: PMC9251435 DOI: 10.1016/j.xplc.2022.100329] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 04/09/2022] [Accepted: 04/18/2022] [Indexed: 05/07/2023]
Abstract
Resistant starch (RS), a healthy dietary fiber, is a particular type of starch that has attracted much research attention in recent years. RS has important roles in reducing glycemic index, postprandial blood glucose levels, and serum cholesterol levels, thereby improving and preventing many diseases, such as diabetes, obesity, and cardiovascular disease. The formation of RS is influenced by intrinsic properties of starch (e.g., starch granule structure, starch crystal structure, and amylose-to-amylopectin ratio) and non-starch components (e.g., proteins, lipids, and sugars), as well as storage and processing conditions. Recent studies have revealed that several starch-synthesis-related genes (SSRGs) are crucial for the formation of RS during seed development. Several transcription factors and mRNA splicing factors have been shown to affect the expression or splicing of SSRGs that regulate RS content, suggesting their potential roles in RS formation. This review focuses mainly on recent research progress on the genetic regulation of RS content and discusses the emerging genetic and molecular mechanisms of RS formation in rice.
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Affiliation(s)
- Lisha Shen
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jiayang Li
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; College of Advanced Agricultural Sciences, University of Chinese Academy of Science, Beijing 100039, China.
| | - Yunhai Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; College of Advanced Agricultural Sciences, University of Chinese Academy of Science, Beijing 100039, China.
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10
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He S, Hao X, Wang S, Zhou W, Ma Q, Lu X, Chen L, Zhang P. Starch synthase II plays a crucial role in starch biosynthesis and the formation of multienzyme complexes in cassava storage roots. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:2540-2557. [PMID: 35134892 DOI: 10.1093/jxb/erac022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
Starch is a glucose polymer synthesized by green plants for energy storage and is crucial for plant growth and reproduction. The biosynthesis of starch polysaccharides is mediated by members of the large starch synthase (SS) protein superfamily. Here, we showed that in cassava storage roots, soluble starch synthase II (MeSSII) plays an important role in starch biosynthesis and the formation of protein complexes with other starch biosynthetic enzymes by directly interacting with MeSSI, MeSBEII, and MeISAII. MeSSII-RNAi cassava lines showed increased amylose content and reduced biosynthesis of the intermediate chain of amylopectin (B1 type) in their storage roots, leading to altered starch physicochemical properties. Furthermore, gel permeation chromatography analysis of starch biosynthetic enzymes between wild type and MeSSII-RNAi lines confirmed the key role of MeSSII in the organization of heteromeric starch synthetic protein complexes. The lack of MeSSII in cassava also reduced the capacity of MeSSI, MeSBEII, MeISAI, and MeISAII to bind to starch granules. These findings shed light on the key components of the starch biosynthesis machinery in root crops.
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Affiliation(s)
- Shutao He
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Systems Biology, CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xiaomeng Hao
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Shanshan Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Wenzhi Zhou
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Qiuxiang Ma
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xinlu Lu
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Luonan Chen
- Key Laboratory of Systems Biology, CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China
- School of Life Science and Technology, ShanghaiTech University, Shanghai, China
- Key Laboratory of Systems Health Science of Zhejiang Province, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
- Guangdong Institute of Intelligence Science and Technology, Hengqin, Zhuhai, Guangdong, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
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11
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Gao H, Niu J, Zhao W, Zhang D, Li S, Xu Y, Liu Y. The Effect and Regulation Mechanism of Powdery Mildew on Wheat Grain Carbon Metabolism. STARCH-STARKE 2022. [DOI: 10.1002/star.202100239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hongyun Gao
- School of Life Sciences Zhengzhou Normal University Zhengzhou 450044 China
| | - Jishan Niu
- National Centre of Engineering and Technological Research for Wheat Henan Agricultural University Zhengzhou 450046 China
| | - Wanyong Zhao
- College of Food and Bioengineering Zhengzhou University of Light Industry Zhengzhou 450000 China
| | - Dale Zhang
- School of Life Sciences Henan University Kaifeng 475004 China
| | - Suoping Li
- School of Life Sciences Henan University Kaifeng 475004 China
| | - Yanhua Xu
- School of Life Sciences Zhengzhou Normal University Zhengzhou 450044 China
| | - Yumiao Liu
- School of Life Sciences Zhengzhou Normal University Zhengzhou 450044 China
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12
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Crofts N, Domon A, Miura S, Hosaka Y, Oitome NF, Itoh A, Noge K, Fujita N. Starch synthases SSIIa and GBSSI control starch structure but do not determine starch granule morphology in the absence of SSIIIa and SSIVb. PLANT MOLECULAR BIOLOGY 2022; 108:379-398. [PMID: 34671919 DOI: 10.1007/s11103-021-01197-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 09/20/2021] [Indexed: 05/21/2023]
Abstract
High levels of two major starch synthases, SSIIa and GBSSI, in ss3a ss4b double mutant rice alter the starch structure but fail to recover the polygonal starch granule morphology. The endosperm starch granule is polygonal in wild-type rice but spherical in double mutant japonica rice lacking genes encoding two of the five major Starch synthase (SS) isozymes expressed in endosperm, SSIIIa and SSIVb. Japonica rice naturally has low levels of SSIIa and Granule-bound SSI (GBSSI). Therefore, introduction of active SSIIa allele and/or high-expressing GBSSI allele from indica rice into the japonica rice mutant lacking SS isozymes can help elucidate the compensatory roles of SS isozymes in starch biosynthesis. In this study, we crossed the ss3a ss4a double mutant japonica rice with the indica rice to generate three new rice lines with high and/or low SSIIa and GBSSI levels, and examined their starch structure, physicochemical properties, and levels of other starch biosynthetic enzymes. Lines with high SSIIa levels showed more SSI and SSIIa bound to starch granule, reduced levels of short amylopectin chains (7 ≤ DP ≤ 12), increased levels of amylopectin chains with DP > 13, and consequently higher gelatinization temperature. Lines with high GBSSI levels showed an increase in amylose content. The ADP-glucose content of the crude extract was high in lines with low or high SSIIa and low GBSSI levels, but was low in lines with high GBSSI. Addition of high SSIIa and GBSSI altered the starch structure and physicochemical properties but did not affect the starch granule morphology, confirming that SSIIIa and SSIVb are key enzymes affecting starch granule morphology in rice. The relationship among SS isozymes and its effect on the amount of substrate (ADP-glucose) is discussed.
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Affiliation(s)
- Naoko Crofts
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Asaka Domon
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Satoko Miura
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Yuko Hosaka
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Naoko F Oitome
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Ayaka Itoh
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Koji Noge
- Department of Biological Production, Akita Prefectural University, Akita, Japan
| | - Naoko Fujita
- Department of Biological Production, Akita Prefectural University, Akita, Japan.
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13
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Huang L, Tan H, Zhang C, Li Q, Liu Q. Starch biosynthesis in cereal endosperms: An updated review over the last decade. PLANT COMMUNICATIONS 2021; 2:100237. [PMID: 34746765 PMCID: PMC8554040 DOI: 10.1016/j.xplc.2021.100237] [Citation(s) in RCA: 89] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 08/08/2021] [Accepted: 08/27/2021] [Indexed: 05/13/2023]
Abstract
Starch is a vital energy source for living organisms and is a key raw material and additive in the food and non-food industries. Starch has received continuous attention in multiple research fields. The endosperm of cereals (e.g., rice, corn, wheat, and barley) is the most important site for the synthesis of storage starch. Around 2010, several excellent reviews summarized key progress in various fields of starch research, serving as important references for subsequent research. In the past 10 years, many achievements have been made in the study of starch synthesis and regulation in cereals. The present review provides an update on research progress in starch synthesis of cereal endosperms over the past decade, focusing on new enzymes and non-enzymatic proteins involved in starch synthesis, regulatory networks of starch synthesis, and the use of elite alleles of starch synthesis-related genes in cereal breeding programs. We also provide perspectives on future research directions that will further our understanding of cereal starch biosynthesis and regulation to support the rational design of ideal quality grain.
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Affiliation(s)
- Lichun Huang
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, China
- Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
| | - Hongyan Tan
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, China
| | - Changquan Zhang
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, China
- Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
| | - Qianfeng Li
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, China
- Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
| | - Qiaoquan Liu
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, China
- Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
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14
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Yu B, Xiang D, Mahfuz H, Patterson N, Bing D. Understanding Starch Metabolism in Pea Seeds towards Tailoring Functionality for Value-Added Utilization. Int J Mol Sci 2021; 22:8972. [PMID: 34445676 PMCID: PMC8396644 DOI: 10.3390/ijms22168972] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/16/2021] [Accepted: 08/16/2021] [Indexed: 11/17/2022] Open
Abstract
Starch is the most abundant storage carbohydrate and a major component in pea seeds, accounting for about 50% of dry seed weight. As a by-product of pea protein processing, current uses for pea starch are limited to low-value, commodity markets. The globally growing demand for pea protein poses a great challenge for the pea fractionation industry to develop new markets for starch valorization. However, there exist gaps in our understanding of the genetic mechanism underlying starch metabolism, and its relationship with physicochemical and functional properties, which is a prerequisite for targeted tailoring functionality and innovative applications of starch. This review outlines the understanding of starch metabolism with a particular focus on peas and highlights the knowledge of pea starch granule structure and its relationship with functional properties, and industrial applications. Using the currently available pea genetics and genomics knowledge and breakthroughs in omics technologies, we discuss the perspectives and possible avenues to advance our understanding of starch metabolism in peas at an unprecedented level, to ultimately enable the molecular design of multi-functional native pea starch and to create value-added utilization.
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Affiliation(s)
- Bianyun Yu
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada; (D.X.); (H.M.); (N.P.)
| | - Daoquan Xiang
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada; (D.X.); (H.M.); (N.P.)
| | - Humaira Mahfuz
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada; (D.X.); (H.M.); (N.P.)
- Department of Biology, Faculty of Science, University of Ottawa, 30 Marie Curie, Ottawa, ON K1N 6N5, Canada
| | - Nii Patterson
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada; (D.X.); (H.M.); (N.P.)
| | - Dengjin Bing
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, 6000 C and E Trail, Lacombe, AB T4L 1W1, Canada;
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15
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Tappiban P, Ying Y, Xu F, Bao J. Proteomics and Post-Translational Modifications of Starch Biosynthesis-Related Proteins in Developing Seeds of Rice. Int J Mol Sci 2021; 22:5901. [PMID: 34072759 PMCID: PMC8199009 DOI: 10.3390/ijms22115901] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/26/2021] [Accepted: 05/28/2021] [Indexed: 12/25/2022] Open
Abstract
Rice (Oryza sativa L.) is a foremost staple food for approximately half the world's population. The components of rice starch, amylose, and amylopectin are synthesized by a series of enzymes, which are responsible for rice starch properties and functionality, and then affect rice cooking and eating quality. Recently, proteomics technology has been applied to the establishment of the differentially expressed starch biosynthesis-related proteins and the identification of posttranslational modifications (PTMs) target starch biosynthesis proteins as well. It is necessary to summarize the recent studies in proteomics and PTMs in rice endosperm to deepen our understanding of starch biosynthesis protein expression and regulation, which will provide useful information to rice breeding programs and industrial starch applications. The review provides a comprehensive summary of proteins and PTMs involved in starch biosynthesis based on proteomic studies of rice developing seeds. Starch biosynthesis proteins in rice seeds were differentially expressed in the developing seeds at different developmental stages. All the proteins involving in starch biosynthesis were identified using proteomics methods. Most starch biosynthesis-related proteins are basically increased at 6-20 days after flowering (DAF) and decreased upon the high-temperature conditions. A total of 10, 14, 2, 17, and 7 starch biosynthesis related proteins were identified to be targeted by phosphorylation, lysine acetylation, succinylation, lysine 2-hydroxyisobutyrylation, and malonylation, respectively. The phosphoglucomutase is commonly targeted by five PTMs types. Research on the function of phosphorylation in multiple enzyme complex formation in endosperm starch biosynthesis is underway, while the functions of other PTMs in starch biosynthesis are necessary to be conducted in the near future.
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Affiliation(s)
- Piengtawan Tappiban
- Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; (P.T.); (Y.Y.); (F.X.)
| | - Yining Ying
- Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; (P.T.); (Y.Y.); (F.X.)
| | - Feifei Xu
- Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; (P.T.); (Y.Y.); (F.X.)
| | - Jinsong Bao
- Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou 310058, China; (P.T.); (Y.Y.); (F.X.)
- Hainan Institute of Zhejiang University, Yazhou Bay Science and Technology City, Yazhou District, Sanya 572025, China
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16
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Seung D. Amylose in starch: towards an understanding of biosynthesis, structure and function. THE NEW PHYTOLOGIST 2020; 228:1490-1504. [PMID: 32767769 DOI: 10.1111/nph.16858] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/13/2020] [Indexed: 05/20/2023]
Abstract
Starch granules are composed of two distinct glucose polymers - amylose and amylopectin. Amylose constitutes 5-35% of most natural starches and has a major influence over starch properties in foods. Its synthesis and storage occurs within the semicrystalline amylopectin matrix of starch granules, this poses a great challenge for biochemical and structural analyses. However, the last two decades have seen vast progress in understanding amylose synthesis, including new insights into the action of GRANULE BOUND STARCH SYNTHASE (GBSS), the major glucosyltransferase that synthesises amylose, and the discovery of PROTEIN TARGETING TO STARCH1 (PTST1) that targets GBSS to starch granules. Advances in analytical techniques have resolved the fine structure of amylose, raising new questions on how structure is determined during biosynthesis. Furthermore, the discovery of wild plants that do not produce amylose revives a long-standing question of why starch granules contain amylose, rather than amylopectin alone. Overall, these findings contribute towards a full understanding of amylose biosynthesis, structure and function that will be essential for future approaches to improve starch quality in crops.
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Affiliation(s)
- David Seung
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
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17
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Tetlow IJ, Bertoft E. A Review of Starch Biosynthesis in Relation to the Building Block-Backbone Model. Int J Mol Sci 2020; 21:E7011. [PMID: 32977627 PMCID: PMC7582286 DOI: 10.3390/ijms21197011] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/15/2020] [Accepted: 09/16/2020] [Indexed: 01/31/2023] Open
Abstract
Starch is a water-insoluble polymer of glucose synthesized as discrete granules inside the stroma of plastids in plant cells. Starch reserves provide a source of carbohydrate for immediate growth and development, and act as long term carbon stores in endosperms and seed tissues for growth of the next generation, making starch of huge agricultural importance. The starch granule has a highly complex hierarchical structure arising from the combined actions of a large array of enzymes as well as physicochemical self-assembly mechanisms. Understanding the precise nature of granule architecture, and how both biological and abiotic factors determine this structure is of both fundamental and practical importance. This review outlines current knowledge of granule architecture and the starch biosynthesis pathway in relation to the building block-backbone model of starch structure. We highlight the gaps in our knowledge in relation to our understanding of the structure and synthesis of starch, and argue that the building block-backbone model takes accurate account of both structural and biochemical data.
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Affiliation(s)
- Ian J. Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON N1G 2W1, Canada
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18
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Comparative Proteomics of Salt-Tolerant and Salt-Sensitive Maize Inbred Lines to Reveal the Molecular Mechanism of Salt Tolerance. Int J Mol Sci 2019; 20:ijms20194725. [PMID: 31554168 PMCID: PMC6801879 DOI: 10.3390/ijms20194725] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/31/2019] [Accepted: 09/12/2019] [Indexed: 12/15/2022] Open
Abstract
Salt stress is one of the key abiotic stresses that causes great loss of yield and serious decrease in quality in maize (Zea mays L.). Therefore, it is very important to reveal the molecular mechanism of salt tolerance in maize. To acknowledge the molecular mechanisms underlying maize salt tolerance, two maize inbred lines, including salt-tolerant 8723 and salt-sensitive P138, were used in this study. Comparative proteomics of seedling roots from two maize inbred lines under 180 mM salt stress for 10 days were performed by the isobaric tags for relative and absolute quantitation (iTRAQ) approach. A total of 1056 differentially expressed proteins (DEPs) were identified. In total, 626 DEPs were identified in line 8723 under salt stress, among them, 378 up-regulated and 248 down-regulated. There were 473 DEPs identified in P138, of which 212 were up-regulated and 261 were down-regulated. Venn diagram analysis showed that 17 DEPs were up-regulated and 12 DEPs were down-regulated in the two inbred lines. In addition, 8 DEPs were up-regulated in line 8723 but down-regulated in P138, 6 DEPs were down-regulated in line 8723 but up-regulated in P138. In salt-stressed 8723, the DEPs were primarily associated with phenylpropanoid biosynthesis, starch and sucrose metabolism, and the mitogen-activated protein kinase (MAPK) signaling pathway. Intriguingly, the DEPs were only associated with the nitrogen metabolism pathway in P138. Compared to P138, the root response to salt stress in 8723 could maintain stronger water retention capacity, osmotic regulation ability, synergistic effects of antioxidant enzymes, energy supply capacity, signal transduction, ammonia detoxification ability, lipid metabolism, and nucleic acid synthesis. Based on the proteome sequencing information, changes of 8 DEPs abundance were related to the corresponding mRNA levels by quantitative real-time PCR (qRT-PCR). Our results from this study may elucidate some details of salt tolerance mechanisms and salt tolerance breeding of maize.
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Crofts N, Itoh A, Abe M, Miura S, Oitome NF, Bao J, Fujita N. Three Major Nucleotide Polymorphisms in the Waxy Gene Correlated with the Amounts of Extra-long Chains of Amylopectin in Rice Cultivars with S or L-type Amylopectin. J Appl Glycosci (1999) 2019; 66:37-46. [PMID: 34354518 PMCID: PMC8056923 DOI: 10.5458/jag.jag.jag-2018_005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 12/03/2018] [Indexed: 11/19/2022] Open
Abstract
Extra-long chains (ELC) of amylopectin in rice endosperm are synthesized by granule-bound starch synthase I encoded by the Waxy (Wx) gene, which primarily synthesizes amylose. Previous studies showed that single nucleotide polymorphisms (SNP) in intron 1 and exon 6 of the Wx gene influences ELC amount. However, whether these SNPs are conserved among rice cultivars and if any other SNPs are present in the Wx gene remained unknown. Here, we sequenced the Wx gene from 17 rice cultivars with S or L-type amylopectin, including those with known ELC content and those originating in China with unique starch properties, as well as typical japonica and indica cultivars. In addition to the two SNPs described above, an additional SNP correlating with ELC content was found in exon 10. Low ELC cultivars (<3.0 %) had thymine at the splicing donor site of intron 1, Tyr224 in exon 6, and Pro415 in exon 10. Cultivars with moderate ELC content (4.1–6.9 %) had guanine at the splicing donor site of intron 1, Ser224 in exon 6, and Pro415 in exon 10. Cultivars with high ELC content (7.7–13.9 %) had guanine at the splicing donor site of intron 1, Tyr224 in exon 6, and Ser415 in exon 10. The chain length distribution pattern of amylopectin was correlated with the amounts of SSIIa found in starch granules and gelatinization temperature, but not with ELC content. The combinations of SNPs in the Wx gene found in this study may provide useful information for screening specific cultivars with different ELC content.
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Affiliation(s)
- Naoko Crofts
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
| | - Ayaka Itoh
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
| | - Misato Abe
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
| | - Satoko Miura
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
| | - Naoko F Oitome
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
| | - Jinsong Bao
- 2 Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University
| | - Naoko Fujita
- 1 Laboratory of Plant Physiology, Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University
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20
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Xia J, Zhu D, Wang R, Cui Y, Yan Y. Crop resistant starch and genetic improvement: a review of recent advances. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2018; 131:2495-2511. [PMID: 30374526 DOI: 10.1007/s00122-018-3221-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 10/24/2018] [Indexed: 05/12/2023]
Abstract
Resistant starch (RS), as a healthy dietary fiber, meets with great human favor along with the rapid development and improvement of global living standards. RS shows direct effects in reducing postprandial blood glucose levels, serum cholesterol levels and glycemic index. Therefore, RS plays an important role in preventing and improving non-communicable diseases, such as obesity, diabetes, colon cancer, cardiovascular diseases and chronic kidney disease. In addition, RS leads to its potential applied value in the development of high-quality foodstuffs, such as bread, noodles and dumplings. This paper reviews the recent advances in RS research, focusing mainly on RS classification and measurement, formation, quantitative trait locus mapping, genome-wide association studies, molecular marker development and genetic improvement through induced mutations, plant breeding combined with marker-assisted selection and genetic transformation. Challenges and perspectives on further RS research are also discussed.
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Affiliation(s)
- Jian Xia
- Laboratory of Molecular Genetics and Proteomics, College of Life Science, Capital Normal University, 100048, Beijing, China
| | - Dong Zhu
- Laboratory of Molecular Genetics and Proteomics, College of Life Science, Capital Normal University, 100048, Beijing, China
| | - Ruomei Wang
- Laboratory of Molecular Genetics and Proteomics, College of Life Science, Capital Normal University, 100048, Beijing, China
| | - Yue Cui
- Laboratory of Molecular Genetics and Proteomics, College of Life Science, Capital Normal University, 100048, Beijing, China
| | - Yueming Yan
- Laboratory of Molecular Genetics and Proteomics, College of Life Science, Capital Normal University, 100048, Beijing, China.
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21
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Goren A, Ashlock D, Tetlow IJ. Starch formation inside plastids of higher plants. PROTOPLASMA 2018; 255:1855-1876. [PMID: 29774409 DOI: 10.1007/s00709-018-1259-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/03/2018] [Indexed: 05/09/2023]
Abstract
Starch is a water-insoluble polyglucan synthesized inside the plastid stroma within plant cells, serving a crucial role in the carbon budget of the whole plant by acting as a short-term and long-term store of energy. The highly complex, hierarchical structure of the starch granule arises from the actions of a large suite of enzyme activities, in addition to physicochemical self-assembly mechanisms. This review outlines current knowledge of the starch biosynthetic pathway operating in plant cells in relation to the micro- and macro-structures of the starch granule. We highlight the gaps in our knowledge, in particular, the relationship between enzyme function and operation at the molecular level and the formation of the final, macroscopic architecture of the granule.
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Affiliation(s)
- Asena Goren
- Department of Mathematics and Statistics, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Daniel Ashlock
- Department of Mathematics and Statistics, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Ian J Tetlow
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada.
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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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23
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Affiliation(s)
- Yasunori Nakamura
- Akita Natural Science Laboratory; Tennoh, Katagami, Akita Japan
- Faculty of Bioresource Sciences; Akita Prefectural University; Shimoshinjo-Nakano, Akita Japan
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24
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Hägglund P, Finnie C, Yano H, Shahpiri A, Buchanan BB, Henriksen A, Svensson B. Seed thioredoxin h. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:974-82. [PMID: 26876537 DOI: 10.1016/j.bbapap.2016.02.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/20/2016] [Accepted: 02/09/2016] [Indexed: 12/30/2022]
Abstract
Thioredoxins are nearly ubiquitous disulfide reductases involved in a wide range of biochemical pathways in various biological systems, and also implicated in numerous biotechnological applications. Plants uniquely synthesize an array of thioredoxins targeted to different cell compartments, for example chloroplastic f- and m-type thioredoxins involved in regulation of the Calvin-Benson cycle. The cytosolic h-type thioredoxins act as key regulators of seed germination and are recycled by NADPH-dependent thioredoxin reductase. The present review on thioredoxin h systems in plant seeds focuses on occurrence, reaction mechanisms, specificity, target protein identification, three-dimensional structure and various applications. The aim is to provide a general background as well as an update covering the most recent findings. This article is part of a Special Issue entitled: Plant Proteomics--a bridge between fundamental processes and crop production, edited by Dr. Hans-Peter Mock.
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Affiliation(s)
- Per Hägglund
- Protein and Immune Systems Biology, Department of Systems Biology, Matematiktorvet, Building 301, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Christine Finnie
- Carlsberg Research Laboratory, Gamle Carlsberg Vej 4, DK-1799 Copenhagen V, Denmark
| | - Hiroyuki Yano
- National Food Research Institute, National Agriculture and Food Research Organization, Kannondai 2-1-12, Tsukuba, Ibaraki 305-8642, Japan
| | - Azar Shahpiri
- Department of Agricultural Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Bob B Buchanan
- Department of Plant and Microbial Biology, Koshland Hall 111, Berkeley, CA 94720-3102, USA
| | - Anette Henriksen
- Department of Large Protein Biophysics and Formulation, Global Research Unit, Novo Nordisk A/S, Novo Nordisk Park, DK-2760 Måløv, Denmark
| | - Birte Svensson
- Enzyme and Protein Chemistry, Department of Systems Biology, Elektrovej, Building 375, DK-2800 Kgs. Lyngby, Denmark.
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Liu D, Wang W, Cai X. Modulation of amylose content by structure-based modification of OsGBSS1 activity in rice (Oryza sativa L.). PLANT BIOTECHNOLOGY JOURNAL 2014; 12:1297-307. [PMID: 25052102 DOI: 10.1111/pbi.12228] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 05/21/2014] [Accepted: 06/12/2014] [Indexed: 05/23/2023]
Abstract
The rice Waxy (Wx) gene encodes granule-bound starch synthase 1 (EC 2.4.1.242), OsGBSS1, which is responsible for amylose synthesis in rice seed endosperm. In this study, we determined the functional contribution of eight amino acids on the activity of OsGBSS1 by introducing site-directed mutated Wx gene constructs into the wx mutant glutinous rice. The eight amino acid residues are suspected to play roles in OsGBSS1 structure maintenance or function based on homologous enzyme sequence alignment and homology modelling. Both OsGBSS1 activity and amylose content were analysed in homozygous transgenic lines carrying the mutated OsGBSS1 (Wx) genes. Our results indicate that mutations at diverse sites in OsGBSS1 reduces its activity by affecting its starch-binding capacity, its ADP-glucose-binding capability or its protein stability. Our results shed new light on the structural basis of OsGBSS1 activity and the mechanisms of OsGBSS1 activity on amylose synthesis in vivo. This study also demonstrates that it is feasible to finely modulate amylose content in rice grains by modifying the OsGBSS1 activity.
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Affiliation(s)
- Derui Liu
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China; Graduate School of the Chinese Academy of Sciences, Beijing, China
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26
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Zhang H, Duan L, Dai JS, Zhang CQ, Li J, Gu MH, Liu QQ, Zhu Y. Major QTLs reduce the deleterious effects of high temperature on rice amylose content by increasing splicing efficiency of Wx pre-mRNA. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2014; 127:273-82. [PMID: 24162153 DOI: 10.1007/s00122-013-2216-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 10/14/2013] [Indexed: 05/12/2023]
Abstract
We discovered four QTLs that maintain proper rice amylose content at high temperature by increasing the splicing efficiency of Wx gene. Amylose content mainly controlled by Wx gene is a key physicochemical property for eating and cooking quality in rice. During the grain filling stage, high temperature can harm rice grain quality by significantly reducing the amylose content in many rice varieties. Here, we provide genetic evidences between Wx gene expression and rice amylose content at high temperature, and identified several quantitative trait loci (QTLs) in this pathway. We performed a genome-wide survey on a set of chromosome segment substitution lines (CSSLs) which carried chromosomal segments from the heat resistant indica 9311 in the heat-sensitive japonica Nipponbare background. Four QTLs, qHAC4, qHAC8a, qHAC8b and qHAC10, which can reduce the deleterious effects of amylose content at high temperature, were identified and mapped to chromosome 4, 8, 8 and 10, respectively. The major QTL qHAC8a, with the highest LOD score of 6.196, was physically mapped to a small chromosome segment (~300 kb). The CSSLs carrying the qHAC8a, qHAC8b and/or qHAC4 from 9311 have the high pre-mRNA splicing efficiency of Wx gene and likely lead to stable amylose content at high temperature. Thus, increasing pre-mRNA processing efficiency of Wx gene could be an important regulation mechanism for maintaining stable amylose content in rice seeds at high temperature. In addition, our results provide a theoretical basis for breeding heat-stable grain in rice.
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Affiliation(s)
- Hua Zhang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
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