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Yuan Z, Yang T, Xiong Q, Shi Y, Han X, Lin Y, Wambui NH, Liu Z, Wang Y, Liu H. PCAP-1a, an exopolysaccharide from Pectobacterium actinidiae, exerts the dual role of immunogenicity and virulence in plants. Carbohydr Polym 2024; 323:121390. [PMID: 37940244 DOI: 10.1016/j.carbpol.2023.121390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 11/10/2023]
Abstract
Plant defense mechanisms begin with the recognition of microbe-associated molecular patterns or pathogen-associated molecular patterns (MAMPs/PAMPs). Several carbohydrates, such as chitin, were reported to induce plant defenses, acting as elicitors. Regrettably, the structures of polysaccharide elicitors have rarely been characterized, and their recognition receptors in plants remain unknown. In the present study, PCAP-1a, an exopolysaccharide (PCAP-1a) purified from Pectobacterium actinidiae, was characterized and found to induce rapid cell death of dicotyledons, acting as a polysaccharide elicitor to induce plant immunity. A series of pattern-triggered immunity (PTI) responses were triggered, including reactive oxygen species production, phosphorylation of mitogen-activated protein kinases and gene transcriptional reprogramming. Moreover, we confirmed that CERK1 is probably one of the immune coreceptors for plants to recognize PCAP-1a. Notably, PCAP-1a also promotes the infection caused by P. actinidiae. In conclusion, our study supports the potential of PCAP-1a as a toxin that plays a dual role of virulence and immune induction in pathogen-plant interactions.
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Affiliation(s)
- Zhixiang Yuan
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Tingmi Yang
- Guangxi Academy of Specialty Crops/Guangxi Key Laboratory of Germplasm Innovation and Utilization of Specialty Commercial Crops in North Guangxi, Guilin 541004, Guangxi, China
| | - Qingping Xiong
- Jiangsu Provincial Key Construction Laboratory of Probiotics Preparation, College of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai'an 223003, China
| | - Yuqi Shi
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Xixi Han
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Yuqing Lin
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Njoroge Hellen Wambui
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Zhuang Liu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China
| | - Yunpeng Wang
- Jiangsu Provincial Key Construction Laboratory of Probiotics Preparation, College of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai'an 223003, China
| | - Hongxia Liu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, China.
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Application of the NanoString nCounter System as an Alternative Method to Investigate Molecular Mechanisms Involved in Host Plant Responses to Plasmodiophora brassicae. Int J Mol Sci 2022; 23:ijms232415581. [PMID: 36555223 PMCID: PMC9779335 DOI: 10.3390/ijms232415581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 12/05/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
Clubroot, caused by the soilborne pathogen Plasmodiophora brassicae, is an important disease of canola (Brassica napus) and other crucifers. The recent application of RNA sequencing (RNA-seq) technologies to study P. brassicae−host interactions has generated large amounts of gene expression data, improving knowledge of the molecular mechanisms of pathogenesis and host resistance. Quantitative PCR (qPCR) analysis has been widely applied to examine the expression of a limited number of genes and to validate the results of RNA-seq studies, but may not be ideal for analyzing larger suites of target genes or increased sample numbers. Moreover, the need for intermediate steps such as cDNA synthesis may introduce variability that could affect the accuracy of the data generated by qPCR. Here, we report the validation of gene expression data from a previous RNA-seq study of clubroot using the NanoString nCounter System, which achieves efficient gene expression quantification in a fast and simple manner. We first confirm the robustness of the NanoString system by comparing the results with those generated by qPCR and RNA-seq and then discuss the importance of some candidate genes for resistance or susceptibility to P. brassicae in the host. The results show that the expression of genes measured using NanoString have a high correlation with the values obtained using the other two technologies, with R > 0.90 and p < 0.01, and the same expression patterns for most genes. The three methods (qPCR, RNA-seq, and NanoString) were also compared in terms of laboratory procedures, time, and cost. We propose that the NanoString nCounter System is a robust, sensitive, highly reproducible, and simple technology for gene expression analysis. NanoString could become a common alternative to qPCR to validate RNA-seq data or to create panels of genes for use as markers of resistance/susceptibility when plants are challenged with different P. brassicae pathotypes.
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Majeed Y, Zhu X, Zhang N, Rasheed A, Tahir MM, Si H. Functional analysis of mitogen-activated protein kinases (MAPKs) in potato under biotic and abiotic stress. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2022; 42:31. [PMID: 37312964 PMCID: PMC10248695 DOI: 10.1007/s11032-022-01302-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Biotic and abiotic stresses are the main constrain of potato (Solanum tuberosum L.) production all over the world. To overcome these hurdles, many techniques and mechanisms have been used for increasing food demand for increasing population. One of such mechanism is mitogen-activated protein kinase (MAPK) cascade, which is significance regulators of MAPK pathway under various biotic and abiotic stress conditions in plants. However, the acute role in potato for various biotic and abiotic resistance is not fully understood. In eukaryotes including plants, MAPK transfer information from sensors to responses. In potato, biotic and abiotic stresses, as well as a range of developmental responses including differentiation, proliferation, and cell death in plants, MAPK plays an essential role in transduction of diverse extracellular stimuli. Different biotic and abiotic stress stimuli such as pathogen (bacteria, virus, and fungi, etc.) infections, drought, high and low temperatures, high salinity, and high or low osmolarity are induced by several MAPK cascade and MAPK gene families in potato crop. The MAPK cascade is synchronized by numerous mechanisms, including not only transcriptional regulation but also through posttranscriptional regulation such as protein-protein interactions. In this review, we will discuss the recent detailed functional analysis of certain specific MAPK gene families which are involved in resistance to various biotic and abiotic stresses in potato. This study will also provide new insights into functional analysis of various MAPK gene families in biotic and abiotic stress response as well as its possible mechanism.
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Affiliation(s)
- Yasir Majeed
- College of Agronomy, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
| | - Xi Zhu
- College of Agronomy, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
| | - Ning Zhang
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
| | - Adnan Rasheed
- Key Laboratory of Crops Physiology, Ecology and Genetic Breeding, Ministry of Education/College of Agronomy, Jiangxi Agricultural University, Nanchang, 330045 China
| | - Majid Mahmood Tahir
- Department of Soil and Environmental Sciences, Faculty of Agriculture, University of Poonch, Azad Jammu and Kashmir, Rawalakot, Pakistan
| | - Huaijun Si
- College of Agronomy, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070 People’s Republic of China
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Lei T, Li N, Ma J, Hui M, Zhao L. Development of molecular markers based on CRa gene sequencing of different clubroot disease-resistant cultivars of Chinese cabbage. Mol Biol Rep 2022; 49:5953-5961. [PMID: 35325358 DOI: 10.1007/s11033-022-07379-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 03/15/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND CRa is a key gene in Chinese cabbage (Brassica rapa ssp. pekinensis) that confers resistance to Plasmodiophora brassicae. In order to efficiently screen the clubroot resistance (CR) gene CRa in breeding, two functional codominant markers of the CRa gene were developed. METHODS AND RESULTS In this study, through comparing the CRa allele sequences in resistant and susceptible cultivars of Chinese cabbage, we found two insertion and deletion of sequence variations in the fourth exon between resistant and susceptible cultivars. Two functional codominant markers for CRa gene were obtained based on the variations, namely, CRaEX04-1 and CRaEX04-3. The lengths of the extended fragment of CRaEX04-1 marker were 321 bp and 186 bp in resistant and susceptible cultivars, respectively. In contrast, those of CRaEX04-3 were 704 bp and 413 bp, respectively. We verified the genetic stability between the developed markers and CRa gene using 57 Chinese cabbage cultivars with known resistance and two genetic populations. The results showed that the marker identification was completely consistent with the known phenotypes in 57 cultivars. The marker identification results followed the 3:1 of Mendel's first law in the F2 population, and the 1:1 of Mendel's first law in the BC1. CONCLUSIONS CRaEX04-1 and CRaEX04-3 can be used as a practical molecular marker for breeding and germplasm resource creation of clubroot disease-resistant Chinese cabbage.
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Affiliation(s)
- Ting Lei
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, Shaanxi, China
| | - Ning Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, Shaanxi, China
| | - Jinjian Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, Shaanxi, China
| | - Maixia Hui
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, Shaanxi, China.
| | - Limin Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, Shaanxi, China
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Ibrahim S, Li K, Ahmad N, Kuang L, Sadau SB, Tian Z, Huang L, Wang X, Dun X, Wang H. Genetic Dissection of Mature Root Characteristics by Genome-Wide Association Studies in Rapeseed ( Brassica napus L.). PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10122569. [PMID: 34961040 PMCID: PMC8705616 DOI: 10.3390/plants10122569] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/16/2021] [Accepted: 11/19/2021] [Indexed: 06/14/2023]
Abstract
Roots are complicated quantitative characteristics that play an essential role in absorbing water and nutrients. To uncover the genetic variations for root-related traits in rapeseed, twelve mature root traits of a Brassica napus association panel were investigated in the field within three environments. All traits showed significant phenotypic variation among genotypes, with heritabilities ranging from 55.18% to 79.68%. Genome-wide association studies (GWAS) using 20,131 SNPs discovered 172 marker-trait associations, including 103 significant SNPs (-log10 (p) > 4.30) that explained 5.24-20.31% of the phenotypic variance. With the linkage disequilibrium r2 > 0.2, these significant associations were binned into 40 quantitative trait loci (QTL) clusters. Among them, 14 important QTL clusters were discovered in two environments and/or with phenotypic contributions greater than 10%. By analyzing the genomic regions within 100 kb upstream and downstream of the peak SNPs within the 14 loci, 334 annotated genes were found. Among these, 32 genes were potentially associated with root development according to their expression analysis. Furthermore, the protein interaction network using the 334 annotated genes gave nine genes involved in a substantial number of interactions, including a key gene associated with root development, BnaC09g36350D. This research provides the groundwork for deciphering B. napus' genetic variations and improving its root system architecture.
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Affiliation(s)
- Sani Ibrahim
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
- Department of Plant Biology, Faculty of Life Sciences, College of Physical and Pharmaceutical Sciences, Bayero University, Kano, P.M.B. 3011, Kano 700006, Nigeria
| | - Keqi Li
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Nazir Ahmad
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Lieqiong Kuang
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Salisu Bello Sadau
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China;
| | - Ze Tian
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Lintao Huang
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Xinfa Wang
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Xiaoling Dun
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
| | - Hanzhong Wang
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Wuhan 430062, China; (S.I.); (K.L.); (N.A.); (L.K.); (Z.T.); (L.H.); (X.W.); (H.W.)
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He X, Wang C, Wang H, Li L, Wang C. The Function of MAPK Cascades in Response to Various Stresses in Horticultural Plants. FRONTIERS IN PLANT SCIENCE 2020; 11:952. [PMID: 32849671 PMCID: PMC7412866 DOI: 10.3389/fpls.2020.00952] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 06/10/2020] [Indexed: 05/08/2023]
Abstract
The mitogen-activated protein kinase (MAPK) cascade is a highly conserved signaling transduction module that transduces extracellular stimuli into intracellular responses in plants. Early studies of plant MAPKs focused on their functions in model plants. Based on the results of whole-genome sequencing, many MAPKs have been identified in horticultural plants, such as tomato and apple. Recent studies revealed that the MAPK cascade also plays crucial roles in the biotic and abiotic stress responses of horticultural plants. In this review, we summarize the composition and classification of MAPK cascades in horticultural plants and recent research on this cascade in responses to abiotic stresses (such as drought, extreme temperature and high salinity) and biotic stresses (such as pathogen infection). In addition, we discuss the most advanced research themes related to plant MAPK cascades, thus facilitating research on MAPK cascade functions in horticultural plants.
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Affiliation(s)
- Xiaowen He
- Shandong Institute of Pomology, Taian, China
| | | | - Haibo Wang
- Shandong Institute of Pomology, Taian, China
| | - Linguang Li
- Shandong Institute of Pomology, Taian, China
| | - Chen Wang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, China
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Genome-Wide Identification and Characterization of the ALOG Domain Genes in Rice. Int J Genomics 2019; 2019:2146391. [PMID: 30923712 PMCID: PMC6409076 DOI: 10.1155/2019/2146391] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 01/06/2019] [Indexed: 11/17/2022] Open
Abstract
The ALOG domain genes, named after the Arabidopsis LSH1 and Oryza G1 (ALOG) proteins, have frequently been reported as key developmental regulators in rice and Arabidopsis. However, the investigation of the ALOG gene family is limited. Here, we conducted a genome-wide investigation of the ALOG gene family in rice and six other species. In total, eighty-four ALOG domain genes were identified from the seven species, of which fourteen ALOG domain genes (OsG1/G1Ls) were identified in the rice genome. The fourteen OsG1/G1Ls were unevenly distributed on eight chromosomes, and we found that eight segmental duplications contributed to the expansion of OsG1/G1Ls in the rice genome. The eighty-four ALOG family genes from seven species were classified into six clusters, and the ALOG domain-defined motifs 1, 2, and 3 were highly conserved across species according to the phylogenetic and structural analysis. However, the newly identified motifs 4 and 5 were only present in monocots, indicating a specified function in monocots. Moreover, OsG1/G1Ls exhibited tissue-specific expression patterns. Coexpression analysis suggested that OsG1 integrates OsMADS50 and the downstream MADS-box genes, such as OsMADS1, to regulate the development of rice inflorescence; OsG1L7 potentially associates with OsMADS22 and OsMADS55 to regulate stem elongation. In addition, comparative expression analysis revealed the conserved biological functions of ALOG family genes among rice, maize, and Arabidopsis. These results have shed light on the functional study of ALOG family genes in rice and other plants.
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Neupane S, Schweitzer SE, Neupane A, Andersen EJ, Fennell A, Zhou R, Nepal MP. Identification and Characterization of Mitogen-Activated Protein Kinase (MAPK) Genes in Sunflower ( Helianthus annuus L.). PLANTS (BASEL, SWITZERLAND) 2019; 8:E28. [PMID: 30678298 PMCID: PMC6409774 DOI: 10.3390/plants8020028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 01/07/2019] [Accepted: 01/16/2019] [Indexed: 12/12/2022]
Abstract
Mitogen-Activated Protein Kinase (MAPK) genes encode proteins that regulate biotic and abiotic stresses in plants through signaling cascades comprised of three major subfamilies: MAP Kinase (MPK), MAPK Kinase (MKK), and MAPKK Kinase (MKKK). The main objectives of this research were to conduct genome-wide identification of MAPK genes in Helianthus annuus and examine functional divergence of these genes in relation to those in nine other plant species (Amborella trichopoda, Aquilegia coerulea, Arabidopsis thaliana, Daucus carota, Glycine max, Oryza sativa, Solanum lycopersicum, Sphagnum fallax, and Vitis vinifera), representing diverse taxonomic groups of the Plant Kingdom. A Hidden Markov Model (HMM) profile of the MAPK genes utilized reference sequences from A. thaliana and G. max, yielding a total of 96 MPKs and 37 MKKs in the genomes of A. trichopoda, A. coerulea, C. reinhardtii, D. carota, H. annuus, S. lycopersicum, and S. fallax. Among them, 28 MPKs and eight MKKs were confirmed in H. annuus. Phylogenetic analyses revealed four clades within each subfamily. Transcriptomic analyses showed that at least 19 HaMPK and seven HaMKK genes were induced in response to salicylic acid (SA), sodium chloride (NaCl), and polyethylene glycol (Peg) in leaves and roots. Of the seven published sunflower microRNAs, five microRNA families are involved in targeting eight MPKs. Additionally, we discussed the need for using MAP Kinase nomenclature guidelines across plant species. Our identification and characterization of MAP Kinase genes would have implications in sunflower crop improvement, and in advancing our knowledge of the diversity and evolution of MAPK genes in the Plant Kingdom.
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Affiliation(s)
- Surendra Neupane
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
| | - Sarah E Schweitzer
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
| | - Achal Neupane
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
| | - Ethan J Andersen
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
| | - Anne Fennell
- Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007, USA.
| | - Ruanbao Zhou
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
| | - Madhav P Nepal
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA.
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