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Song Q, Zhao Y, Wu F, Guo X, Yu H, Li J, Li W, Wang Y, Li M, Xu J. Physiological and molecular responses of strawberry plants to Cd stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 213:108800. [PMID: 38905729 DOI: 10.1016/j.plaphy.2024.108800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/21/2024] [Accepted: 06/04/2024] [Indexed: 06/23/2024]
Abstract
Cadmium (Cd), a toxic metal element, can be absorbed by plants via divalent metal ion transporters, thereby retarding plant growth and posing a threat to human health. Strawberries are popular and economically valuable berry species that are sensitive to soil pollutants, especially Cd. However, the mechanisms underlying Cd stress responses in strawberry plants remain largely unclear. Here, we investigated the physiological and molecular basis of Cd stress responses in strawberry plants using the diploid strawberry 'Yellow Wonder' as a material. The results indicated that Cd stress induced oxidative damage, repressed photosynthetic efficiency, and interfered with the accumulation and redistribution of trace elements. Furthermore, Cd stress reduced the concentrations of indoleacetic acid, trans-zeatin riboside and gibberellic acid while increasing the concentration of abscisic acid, thus altering the phytohormone signaling pathway in strawberry plants. Cd stress also inhibited the expression of genes involved in nitrogen uptake and assimilation while promoting the energy supply for plant survival under Cd toxicity. Moreover, the flavonoid biosynthesis pathway was induced, and the anthocyanin concentration increased, thereby improving the free radical scavenging capacity of strawberry plants under Cd toxicity. Additionally, we identified several transcription factors and functional genes as hub genes based on a weighted gene coexpression network analysis. These results collectively provide a theoretical foundation for strawberry breeding and ensuring agriculture and food safety.
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Affiliation(s)
- Qianqian Song
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Yuan Zhao
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Fei Wu
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Xiaoyu Guo
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Hao Yu
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Junjun Li
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Weimin Li
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Yanfang Wang
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China
| | - Meng Li
- Department of Pharmacy and Biotechnology, Zibo Vocational Institute, Zibo, 255300, China
| | - Jin Xu
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China.
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Guo L, Liao Y, Deng S, Li J, Bu X, Zhu C, Zhang W, Cong X, Cheng S, Chen Q, Xu F. Genome-wide analysis of NAC transcription factors and exploration of candidate genes regulating selenium metabolism in Broussonetia papyrifera. PLANTA 2024; 260:1. [PMID: 38753175 DOI: 10.1007/s00425-024-04438-7] [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: 12/06/2023] [Accepted: 05/09/2024] [Indexed: 07/03/2024]
Abstract
MAIN CONCLUSION Genome-wide identification revealed 79 BpNAC genes belonging to 16 subfamilies, and their gene structures and evolutionary relationships were characterized. Expression analysis highlighted their importance in plant selenium stress responses. Paper mulberry (Broussonetia papyrifera), a deciduous arboreal plant of the Moraceae family, is distinguished by its leaves, which are abundant in proteins, polysaccharides, and flavonoids, positioning it as a novel feedstock. NAC transcription factors, exclusive to plant species, are crucial in regulating growth, development, and response to biotic and abiotic stress. However, extensive characterization of the NAC family within paper mulberry is lacking. In this study, 79 BpNAC genes were identified from the paper mulberry genome, with an uneven distribution across 13 chromosomes. A comprehensive, genome-wide analysis of BpNACs was performed, including investigating gene structures, promoter regions, and chromosomal locations. Phylogenetic tree analysis, alongside comparisons with Arabidopsis thaliana NACs, allowed for categorizing these genes into 16 subfamilies in alignment with gene structure and motif conservation. Collinearity analysis suggested a significant homologous relationship between the NAC genes of paper mulberry and those in Morus notabilis, Ficus hispida, Antiaris toxicaria, and Cannabis sativa. Integrating transcriptome data and Se content revealed that 12 BpNAC genes were associated with selenium biosynthesis. Subsequent RT-qPCR analysis corroborated the correlation between BpNAC59, BpNAC62 with sodium selenate, and BpNAC55 with sodium selenite. Subcellular localization experiments revealed the nuclear functions of BpNAC59 and BpNAC62. This study highlights the potential BpNAC transcription factors involved in selenium metabolism, providing a foundation for strategically breeding selenium-fortified paper mulberry.
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Affiliation(s)
- Longfei Guo
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China
| | - Yongling Liao
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China
| | - Shiming Deng
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 445000, Hubei, China
| | - Jitao Li
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 445000, Hubei, China
| | - Xianchen Bu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China
| | - Changye Zhu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China
| | - Weiwei Zhang
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 445000, Hubei, China
| | - Xin Cong
- Enshi Se-Run Material Engineering Technology Co., Ltd., Enshi, 445000, Hubei, China
| | - Shuiyuan Cheng
- National R&D Center for Se-rich Agricultural Products Processing, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China
| | - Qiangwen Chen
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China.
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 445000, Hubei, China.
- Enshi Se-Run Material Engineering Technology Co., Ltd., Enshi, 445000, Hubei, China.
| | - Feng Xu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, 434025, Hubei, China.
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Huang X, Qiu X, Wang Y, Abubakar AS, Chen P, Chen J, Chen K, Yu C, Wang X, Gao G, Zhu A. Genome-Wide Investigation of the NAC Transcription Factor Family in Apocynum venetum Revealed Their Synergistic Roles in Abiotic Stress Response and Trehalose Metabolism. Int J Mol Sci 2023; 24:ijms24054578. [PMID: 36902009 PMCID: PMC10003206 DOI: 10.3390/ijms24054578] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/21/2023] [Accepted: 02/23/2023] [Indexed: 03/02/2023] Open
Abstract
NAC (NAM, ATAF1/2, and CUC2) transcription factors (TFs) are one of the most prominent plant-specific TF families and play essential roles in plant growth, development and adaptation to abiotic stress. Although the NAC gene family has been extensively characterized in many species, systematic analysis is still relatively lacking in Apocynum venetum (A. venetum). In this study, 74 AvNAC proteins were identified from the A. venetum genome and were classified into 16 subgroups. This classification was consistently supported by their gene structures, conserved motifs and subcellular localizations. Nucleotide substitution analysis (Ka/Ks) showed the AvNACs to be under the influence of strong purifying selection, and segmental duplication events were found to play the dominant roles in the AvNAC TF family expansion. Cis-elements analysis demonstrated that the light-, stress-, and phytohormone-responsive elements being dominant in the AvNAC promoters, and potential TFs including Dof, BBR-BPC, ERF and MIKC_MADS were visualized in the TF regulatory network. Among these AvNACs, AvNAC58 and AvNAC69 exhibited significant differential expression in response to drought and salt stresses. The protein interaction prediction further confirmed their potential roles in the trehalose metabolism pathway with respect to drought and salt resistance. This study provides a reference for further understanding the functional characteristics of NAC genes in the stress-response mechanism and development of A. venetum.
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Affiliation(s)
- Xiaoyu Huang
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Xiaojun Qiu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Yue Wang
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Aminu Shehu Abubakar
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
- Department of Agronomy, Bayero University Kano, Kano PMB 3011, Nigeria
| | - Ping Chen
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Jikang Chen
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Kunmei Chen
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Chunming Yu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Xiaofei Wang
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
| | - Gang Gao
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
- National Breeding Center for Bast Fiber Crops, Changsha 410221, China
- Key Laboratory of Genetic Breeding and Microbial Processing for Bast Fiber Product of Hunan Province, Changsha 410221, China
- Correspondence: (G.G.); (A.Z.); Tel.: +86-0731-8899-8511 (G.G.); +86-0731-8899-8586 (A.Z.)
| | - Aiguo Zhu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410221, China
- National Breeding Center for Bast Fiber Crops, Changsha 410221, China
- Key Laboratory of Genetic Breeding and Microbial Processing for Bast Fiber Product of Hunan Province, Changsha 410221, China
- Correspondence: (G.G.); (A.Z.); Tel.: +86-0731-8899-8511 (G.G.); +86-0731-8899-8586 (A.Z.)
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Analysis of the NAC Gene Family in Salix and the Identification of SpsNAC005 Gene Contributing to Salt and Drought Tolerance. FORESTS 2022. [DOI: 10.3390/f13070971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
The NAC gene family is of great value for plant stress resistance and development. In this study, five NAC genes with a typical NAM domain were isolated from Salix psammophila, which is a stress-resistant willow endemic to western China. Two hundred sixty-two NAC genes from Salix psammophila, Salix purpurea, and Arabidopsis were used to construct the phylogenetic tree to examine the phylogenetic relationship. Five NAC genes in Salix psammophila were the focus of bioinformatics analysis and conserved structural domain analysis. The SpsNAC005 gene was overexpressed in Populus hopeiensis, and the transgenic lines were subjected to salt and simulated drought stress to analyze their phenotype changes and tolerance to stress. The results showed that transgenic poplar height and leaf area increased by 29.73% and 76.36%, respectively, compared with those of wild-type plants. Under stress treatment, the height growth rates and ground diameter growth rates of the transgenic lines were significantly higher than those of the wild-type, whereas their fresh weight and dry weight were decreased compared to those of the wild-type. The SOD activities, POD activities, and Pro contents of the transgenic plants were significantly increased, and the accumulation of MDA was significantly lower than that in the wild-type, and the transgenic lines showed clear tolerance to salt and drought. The expressions of the SOS1, MPK6, HKT1, and P5CS1 genes were downregulated in the transgenic lines. The expression of the PRODH1 gene was downregulated in the transgenic lines. These results indicate that overexpression of the SpsNAC005 gene in transgenic plants can promote plant growth and development and improve tolerance to salt and drought.
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Srivastava R, Sahoo L. Cowpea NAC Transcription Factors Positively Regulate Cellular Stress Response and Balance Energy Metabolism in Yeast via Reprogramming of Biosynthetic Pathways. ACS Synth Biol 2021; 10:2286-2307. [PMID: 34470212 DOI: 10.1021/acssynbio.1c00208] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Yeast is a dominant host for recombinant production of heterologous proteins, high-value biochemical compounds, and microbial fermentation. During bioprocess operations, pH fluctuations, organic solvents, drying, starvation, osmotic pressure, and often a combination of these stresses cause growth inhibition or death, markedly limiting its industrial use. Thus, stress-tolerant yeast strains with balanced energy-bioenergetics are highly desirous for sustainable improvement of quality biotechnological production. We isolated two NAC transcription factors (TFs), VuNAC1 and VuNAC2, from a wild cowpea genotype, improving both stress tolerance and growth when expressed in yeast. The GFP-fused proteins were localized to the nucleus. Y2H and reporter assay demonstrated the dimerization and transactivation abilities of the VuNAC proteins having structural folds similar to rice SNAC1. The gel-shift assay indicated that the TFs recognize an "ATGCGTG" motif for DNA-binding shared by several native TFs in yeast. The heterologous expression of VuNAC1/2 in yeast improved growth, biomass, lifespan, fermentation efficiency, and altered cellular composition of biomolecules. The transgenic strains conferred tolerance to multiple stresses such as high salinity, osmotic stress, freezing, and aluminum toxicity. Analysis of the metabolome revealed reprogramming of major pathways synthesizing nucleotides, vitamin B complex, amino acids, antioxidants, flavonoids, and other energy currencies and cofactors. Consequently, the transcriptional tuning of stress signaling and biomolecule metabolism improved the survival of the transgenic strains during starvation and stress recovery. VuNAC1/2-based synthetic gene expression control may contribute to designing robust industrial yeast strains with value-added productivity.
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Affiliation(s)
- Richa Srivastava
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Lingaraj Sahoo
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
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6
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Peng H, Neff MM. Two ATAF transcription factors ANAC102 and ATAF1 contribute to the suppression of cytochrome P450-mediated brassinosteroid catabolism in Arabidopsis. PHYSIOLOGIA PLANTARUM 2021; 172:1493-1505. [PMID: 33491178 DOI: 10.1111/ppl.13339] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/16/2020] [Accepted: 01/17/2021] [Indexed: 06/12/2023]
Abstract
PHYB ACTIVATION TAGGED SUPPRESSOR 1 (BAS1) and SUPPRESSOR OF PHYB-4 7 (SOB7) are two cytochrome P450 enzymes that inactivate brassinosteroids (BRs) in Arabidopsis. The NAC transcription factor (TF) ATAF2 (ANAC081) and the core circadian clock regulator CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) both suppress the expression of BAS1 and SOB7 via direct promoter binding. Additionally, BRs cause feedback suppression on ATAF2 expression. Here, we report that two ATAF-subgroup TFs, ANAC102 and ATAF1 (ANAC002), also contribute to the transcriptional suppression of BAS1 and SOB7. ANAC102 and ATAF1 gene-knockout mutants exhibit elevated expression of both BAS1 and SOB7, expanded tissue-level accumulation of their protein products and reduced hypocotyl growth in response to exogenous BR treatments. Similar to ATAF2, both ANAC102 and ATAF1 are transcriptionally suppressed by BRs and white light. Neither BAS1 nor SOB7 expression is further elevated in ATAF double or triple mutants, suggesting that the suppression effect of these three ATAFs is not additive. In addition, ATAF single, double, and triple mutants have similar levels of BR responsiveness with regard to hypocotyl elongation. ATAF2, ANAC102, ATAF1, and CCA1 physically interact with itself and each other, suggesting that they may coordinately suppress BAS1 and SOB7 expression via protein-protein interactions. Despite the absence of CCA1-binding elements in their promoters, ANAC102 and ATAF1 have similar transcript circadian oscillation patterns as that of CCA1, suggesting that these two ATAF genes may be indirectly regulated by the circadian clock.
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Affiliation(s)
- Hao Peng
- Department of Crop and Soil Sciences, Washington State University, Pullman, Washington, USA
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Palomar VM, Garciarrubio A, Garay-Arroyo A, Martínez-Martínez C, Rosas-Bringas O, Reyes JL, Covarrubias AA. The canonical RdDM pathway mediates the control of seed germination timing under salinity. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:691-707. [PMID: 33131171 DOI: 10.1111/tpj.15064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 09/11/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Plants respond to adverse environmental cues by adjusting a wide variety of processes through highly regulated mechanisms to maintain plant homeostasis for survival. As a result of the sessile nature of plants, their response, adjustment and adaptation to the changing environment is intimately coordinated with their developmental programs through the crosstalk of regulatory networks. Germination is a critical process in the plant life cycle, and thus plants have evolved various strategies to control the timing of germination according to their local environment. The mechanisms involved in these adjustment responses are largely unknown, however. Here, we report that mutations in core elements of canonical RNA-directed DNA methylation (RdDM) affect the germination and post-germination growth of Arabidopsis seeds grown under salinity stress. Transcriptomic and whole-genome bisulfite sequencing (WGBS) analyses support the involvement of this pathway in the control of germination timing and post-germination growth under salinity stress by preventing the transcriptional activation of genes implicated in these processes. Subsequent transcriptional effects on genes that function in relation to these developmental events support this conclusion.
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Affiliation(s)
- Víctor Miguel Palomar
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
| | - Alejandro Garciarrubio
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
| | - Adriana Garay-Arroyo
- Laboratorio de Genética Molecular, Desarrollo y Evolución de Plantas, Instituto de Ecología, Universidad Nacional Autónoma de México, Circuito Exterior S/N anexo Jardín Botánico Exterior, Ciudad Universitaria, Ciudad de México, C.P. 04500, México
| | - Coral Martínez-Martínez
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
| | - Omar Rosas-Bringas
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
| | - José L Reyes
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
| | - Alejandra A Covarrubias
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Mor. C.P, 62250, Mexico
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Comparative physiological and metabolomic analyses revealed that foliar spraying with zinc oxide and silica nanoparticles modulates metabolite profiles in cucumber (
Cucumis sativus
L.). Food Energy Secur 2021. [DOI: 10.1002/fes3.269] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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9
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Mateo de Arias M, Gao L, Sherwood DA, Dwivedi KK, Price BJ, Jamison M, Kowallis BM, Carman JG. Whether Gametophytes are Reduced or Unreduced in Angiosperms Might Be Determined Metabolically. Genes (Basel) 2020; 11:genes11121449. [PMID: 33276690 PMCID: PMC7761559 DOI: 10.3390/genes11121449] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/23/2020] [Accepted: 11/27/2020] [Indexed: 02/07/2023] Open
Abstract
In angiosperms, meiotic failure coupled with the formation of genetically unreduced gametophytes in ovules (apomeiosis) constitute major components of gametophytic apomixis. These aberrant developmental events are generally thought to be caused by mutation. However, efforts to locate the responsible mutations have failed. Herein, we tested a fundamentally different hypothesis: apomeiosis is a polyphenism of meiosis, with meiosis and apomeiosis being maintained by different states of metabolic homeostasis. Microarray analyses of ovules and pistils were used to differentiate meiotic from apomeiotic processes in Boechera (Brassicaceae). Genes associated with translation, cell division, epigenetic silencing, flowering, and meiosis characterized sexual Boechera (meiotic). In contrast, genes associated with stress responses, abscisic acid signaling, reactive oxygen species production, and stress attenuation mechanisms characterized apomictic Boechera (apomeiotic). We next tested whether these metabolic differences regulate reproductive mode. Apomeiosis switched to meiosis when premeiotic ovules of apomicts were cultured on media that increased oxidative stress. These treatments included drought, starvation, and H2O2 applications. In contrast, meiosis switched to apomeiosis when premeiotic pistils of sexual plants were cultured on media that relieved oxidative stress. These treatments included antioxidants, glucose, abscisic acid, fluridone, and 5-azacytidine. High-frequency apomeiosis was initiated in all sexual species tested: Brassicaceae, Boechera stricta, Boechera exilis, and Arabidopsis thaliana; Fabaceae, Vigna unguiculata; Asteraceae, Antennaria dioica. Unreduced gametophytes formed from ameiotic female and male sporocytes, first division restitution dyads, and nucellar cells. These results are consistent with modes of reproduction and types of apomixis, in natural apomicts, being regulated metabolically.
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Affiliation(s)
- Mayelyn Mateo de Arias
- Plants, Soils, and Climate Department, Utah State University, Logan, UT 84322-4820, USA; (M.M.d.A.); (L.G.); (D.A.S.); (B.J.P.)
- Instituto Tecnológico de Santo Domingo, 10103 Santo Domingo, Dominican Republic
| | - Lei Gao
- Plants, Soils, and Climate Department, Utah State University, Logan, UT 84322-4820, USA; (M.M.d.A.); (L.G.); (D.A.S.); (B.J.P.)
- College of Pharmacy and Life Science, Jiujiang University, Jiujiang 332000, China
| | - David A. Sherwood
- Plants, Soils, and Climate Department, Utah State University, Logan, UT 84322-4820, USA; (M.M.d.A.); (L.G.); (D.A.S.); (B.J.P.)
- Sherwood Pet Health, Logan, UT 84321, USA
| | - Krishna K. Dwivedi
- Caisson Laboratories, Inc., Smithfield, UT 84335, USA; (K.K.D.); (M.J.); (B.M.K.)
- Crop Improvement Division, Indian Grassland and Fodder Research Institute, 284003 Jhansi, India
| | - Bo J. Price
- Plants, Soils, and Climate Department, Utah State University, Logan, UT 84322-4820, USA; (M.M.d.A.); (L.G.); (D.A.S.); (B.J.P.)
- Molecular Biology Program, University of Utah, Salt Lake City, UT 84112-5750, USA
| | - Michelle Jamison
- Caisson Laboratories, Inc., Smithfield, UT 84335, USA; (K.K.D.); (M.J.); (B.M.K.)
- Wescor, Inc. An Elitech Company, Logan, UT 84321, USA
| | - Becky M. Kowallis
- Caisson Laboratories, Inc., Smithfield, UT 84335, USA; (K.K.D.); (M.J.); (B.M.K.)
- Cytiva, Inc., Logan, UT 84321, USA
| | - John G. Carman
- Plants, Soils, and Climate Department, Utah State University, Logan, UT 84322-4820, USA; (M.M.d.A.); (L.G.); (D.A.S.); (B.J.P.)
- Correspondence: ; Tel.: +1-435-512-4913
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Peng H, Phung J, Zhai Y, Neff MM. Self-transcriptional repression of the Arabidopsis NAC transcription factor ATAF2 and its genetic interaction with phytochrome A in modulating seedling photomorphogenesis. PLANTA 2020; 252:48. [PMID: 32892254 DOI: 10.1007/s00425-020-03456-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 08/27/2020] [Indexed: 06/11/2023]
Abstract
The NAC transcription factor ATAF2 suppresses its own transcription via self-promoter binding. ATAF2 genetically interacts with the circadian regulator CCA1 and phytochrome A to modulate seedling photomorphogenesis in Arabidopsis thaliana. ATAF2 (ANAC081) is a NAC (NAM, ATAF and CUC) transcription factor (TF) that participates in the regulation of disease resistance, stress tolerance and hormone metabolism in Arabidopsis thaliana. We previously reported that ATAF2 promotes Arabidopsis hypocotyl growth in a light-dependent manner via transcriptionally suppressing the brassinosteroid (BR)-inactivating cytochrome P450 genes BAS1 (CYP734A1, formerly CYP72B1) and SOB7 (CYP72C1). Assays using low light intensities suggest that the photoreceptor phytochrome A (PHYA) may play a more critical role in ATAF2-regulated photomorphogenesis than phytochrome B (PHYB) and cryptochrome 1 (CRY1). In addition, ATAF2 is also regulated by the circadian clock. The core circadian TF CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) physically interacts with ATAF2 at the DNA-protein and protein-protein levels, and both differentially suppress BAS1- and SOB7-mediated BR catabolism. In this research, we show that ATAF2 can bind its own promoter as a transcriptional self-repressor. This self-feedback-suppression loop is a typical feature of multiple circadian-regulated genes. Additionally, ATAF2 and CCA1 synergistically suppress seedling photomorphogenesis as reflected by the light-dependent hypocotyl growth analysis of their single and double gene knock-out mutants. Similar fluence-rate response assays using ATAF2 and photoreceptor (PHYB, CRY1 and PHYA) knock-out mutants demonstrate that PHYA is required for ATAF2-regulated photomorphogenesis in a wide range of light intensities. Furthermore, disruption of PHYA can suppress the BR-insensitive hypocotyl-growth phenotype of ATAF2 loss-of-function seedlings in the light, but not in darkness. Collectively, our results provide a genetic interaction synopsis of the circadian-clock-photomorphogenesis-BR integration node involving ATAF2, CCA1 and PHYA.
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Affiliation(s)
- Hao Peng
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA
| | - Jessica Phung
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA
| | - Ying Zhai
- Department of Plant Pathology, Washington State University, Pullman, WA, 99164, USA
| | - Michael M Neff
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA.
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Sun L, Wang R, Ju Q, Xu J. Physiological, Metabolic, and Transcriptomic Analyses Reveal the Responses of Arabidopsis Seedlings to Carbon Nanohorns. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:4409-4420. [PMID: 32182044 DOI: 10.1021/acs.est.9b07133] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Carbon-based nanomaterials have potential applications in nanoenabled agriculture. However, the physiological and molecular mechanisms underlying single-walled carbon nanohorn (SWCNH)-mediated plant growth remain unclear. Here, we investigated the effects of SWCNHs on Arabidopsis grown in 1/4-strength Murashige and Skoog medium via physiological, genetic, and molecular analyses. Treatment with 0.1 mg/L SWCNHs promoted primary root (PR) growth and lateral root (LR) formation; 50 and 100 mg/L SWCNHs inhibited PR growth. Treatment with 0.1 mg/L SWCNHs increased the lengths of the meristematic and elongation zones, and transcriptomic and genetic analyses confirmed the positive effects of SWCNHs on root tip stem cell niche activity and meristematic cell division potential. Increased expression of YUC3 and YUC5 and increased PIN2 abundance improved PR growth and LR development in 0.1 mg/L SWCNH-treated seedlings. Metabolomic analyses revealed that SWCNHs altered the levels of sugars, amino acids, and organic acids, suggesting that SWCNHs reprogrammed carbon/nitrogen metabolism in plants. SWCNHs also regulate plant growth and development by increasing the levels of several secondary metabolites; transcriptomic analyses further supported these results. The present results are valuable for continued use of SWCNHs in agri-nanotechnology, and these molecular approaches could serve as examples for studies on the effects of nanomaterials in plants.
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Affiliation(s)
- Liangliang Sun
- College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla Yunnan 666303, China
| | - Ruting Wang
- College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla Yunnan 666303, China
| | - Qiong Ju
- College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla Yunnan 666303, China
| | - Jin Xu
- College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla Yunnan 666303, China
- Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla Yunnan 666303, China
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