1
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Li Y, Liu Y, Ran G, Yu Y, Zhou Y, Zhu Y, Du Y, Pi L. The pentatricopeptide repeat protein DG1 promotes the transition to bilateral symmetry during Arabidopsis embryogenesis through GUN1-mediated plastid signals. THE NEW PHYTOLOGIST 2024. [PMID: 39140987 DOI: 10.1111/nph.20056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Accepted: 07/25/2024] [Indexed: 08/15/2024]
Abstract
During Arabidopsis embryogenesis, the transition of the embryo's symmetry from radial to bilateral between the globular and heart stage is a crucial event, involving the formation of cotyledon primordia and concurrently the establishment of a shoot apical meristem (SAM). However, a coherent framework of how this transition is achieved remains to be elucidated. In this study, we investigated the function of DELAYED GREENING 1 (DG1) in Arabidopsis embryogenesis using a newly identified dg1-3 mutant. The absence of chloroplast-localized DG1 in the mutants led to embryos being arrested at the globular or heart stage, accompanied by an expansion of WUSCHEL (WUS) and SHOOT MERISTEMLESS (STM) expression. This finding pinpoints the essential role of DG1 in regulating the transition to bilateral symmetry. Furthermore, we showed that this regulation of DG1 may not depend on its role in plastid RNA editing. Nevertheless, we demonstrated that the DG1 function in establishing bilateral symmetry is genetically mediated by GENOMES UNCOUPLED 1 (GUN1), which represses the transition process in dg1-3 embryos. Collectively, our results reveal that DG1 functionally antagonizes GUN1 to promote the transition of the Arabidopsis embryo's symmetry from radial to bilateral and highlight the role of plastid signals in regulating pattern formation during plant embryogenesis.
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Affiliation(s)
- Yajie Li
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
| | - Yiqiong Liu
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
| | - Guiping Ran
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
| | - Yue Yu
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
| | - Yifan Zhou
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Yuxian Zhu
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Yujuan Du
- Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, 464-8601, Japan
- School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Limin Pi
- State Key Laboratory of Hybrid Rice, Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
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2
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Wang X, Ji D, Ma J, Chi W. Function of plastid translation in plant temperature acclimation: Retrograde signalling or extraribosomal 'moonlighting' functions? PLANT, CELL & ENVIRONMENT 2024. [PMID: 39101459 DOI: 10.1111/pce.15074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 07/06/2024] [Accepted: 07/25/2024] [Indexed: 08/06/2024]
Abstract
Summary StatementSpecific components of the plastid ribosome could act as pivotal limiting factors in plant temperature acclimation. We endeavour to elucidate the molecular nexus between plastid translation and temperature acclimation by incorporating the concept of extraribosomal ‘moonlighting’ functions of plastid ribosome proteins.
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Affiliation(s)
- Xiushun Wang
- College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Daili Ji
- Key Laboratory of Photobiology, Photosynthesis Research Center, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Jinfang Ma
- Key Laboratory of Photobiology, Photosynthesis Research Center, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Wei Chi
- College of Life Sciences, Nanjing Normal University, Nanjing, China
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3
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Fujii S, Wada H, Kobayashi K. Orchestration of Photosynthesis-Associated Gene Expression and Galactolipid Biosynthesis during Chloroplast Differentiation in Plants. PLANT & CELL PHYSIOLOGY 2024; 65:1014-1028. [PMID: 38668647 PMCID: PMC11209550 DOI: 10.1093/pcp/pcae049] [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: 10/05/2023] [Revised: 04/18/2024] [Accepted: 04/25/2024] [Indexed: 06/28/2024]
Abstract
The chloroplast thylakoid membrane is composed of membrane lipids and photosynthetic protein complexes, and the orchestration of thylakoid lipid biosynthesis and photosynthesis-associated protein accumulation is considered important for thylakoid development. Galactolipids consist of ∼80% of the thylakoid lipids, and their biosynthesis is fundamental for chloroplast development. We previously reported that the suppression of galactolipid biosynthesis decreased the expression of photosynthesis-associated nuclear-encoded genes (PhAPGs) and photosynthesis-associated plastid-encoded genes (PhAPGs). However, the mechanism for coordinative regulation between galactolipid biosynthesis in plastids and the expression of PhANGs and PhAPGs remains largely unknown. To elucidate this mechanism, we investigated the gene expression patterns in galactolipid-deficient Arabidopsis seedlings during the de-etiolation process. We found that galactolipids are crucial for inducing both the transcript accumulation of PhANGs and PhAPGs and the accumulation of plastid-encoded photosynthesis-associated proteins in developing chloroplasts. Genetic analysis indicates the contribution of the GENOMES UNCOUPLED1 (GUN1)-mediated plastid-to-nucleus signaling pathway to PhANG regulation in response to galactolipid levels. Previous studies suggested that the accumulation of GUN1 reflects the state of protein homeostasis in plastids and alters the PhANG expression level. Thus, we propose a model that galactolipid biosynthesis determines the protein homeostasis in plastids in the initial phase of de-etiolation and optimizes GUN1-dependent signaling to regulate the PhANG expression. This mechanism might contribute to orchestrating the biosynthesis of lipids and proteins for the biogenesis of functional chloroplasts in plants.
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Affiliation(s)
- Sho Fujii
- Department of Biology, Faculty of Agriculture and Life Science, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori, 036-8561 Japan
| | - Hajime Wada
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902 Japan
| | - Koichi Kobayashi
- Department of Biology, Graduate School of Science, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531 Japan
- Faculty of Liberal Arts, Science and Global Education, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531 Japan
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4
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Bai A, Zhao T, Li Y, Zhang F, Wang H, Shah SHA, Gong L, Liu T, Wang Y, Hou X, Li Y. QTL mapping and candidate gene analysis reveal two major loci regulating green leaf color in non-heading Chinese cabbage. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2024; 137:105. [PMID: 38622387 DOI: 10.1007/s00122-024-04608-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 03/23/2024] [Indexed: 04/17/2024]
Abstract
KEY MESSAGE Two major-effect QTL GlcA07.1 and GlcA09.1 for green leaf color were fine mapped into 170.25 kb and 191.41 kb intervals on chromosomes A07 and A09, respectively, and were validated by transcriptome analysis. Non-heading Chinese cabbage (NHCC) is a leafy vegetable with a wide range of green colors. Understanding the genetic mechanism behind broad spectrum of green may facilitate the breeding of high-quality NHCC. Here, we used F2 and F7:8 recombination inbred line (RIL) population from a cross between Wutacai (dark-green) and Erqing (lime-green) to undertake the genetic analysis and quantitative trait locus (QTL) mapping in NHCC. The genetic investigation of the F2 population revealed that the variation of green leaf color was controlled by two recessive genes. Six pigments associated with green leaf color, including total chlorophyll, chlorophyll a, chlorophyll b, total carotenoids, lutein, and carotene were quantified and applied for QTL mapping in the RIL population. A total of 7 QTL were detected across the whole genome. Among them, two major-effect QTL were mapped on chromosomes A07 (GlcA07.1) and A09 (GlcA09.1) corresponding to two QTL identified in the F2 population. The QTL GlcA07.1 and GlcA09.1 were further fine mapped into 170.25 kb and 191.41 kb genomic regions, respectively. By comparing gene expression level and gene annotation, BraC07g023810 and BraC07g023970 were proposed as the best candidates for GlcA07.1, while BraC09g052220 and BraC09g052270 were suggested for GlcA09.1. Two InDel molecular markers (GlcA07.1-BcGUN4 and GlcA09.1-BcSG1) associated with BraC07gA023810 and BraC09g052220 were developed and could effectively identify leaf color in natural NHCC accessions, suggesting their potential for marker-assisted leaf color selection in NHCC breeding.
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Affiliation(s)
- Aimei Bai
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Tianzi Zhao
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Yan Li
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Feixue Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
- Huzhou Academy of Agricultural Sciences, Huzhou, 313000, Zhejiang Province, China
| | - Haibin Wang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Sayyed Hamad Ahmad Shah
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Li Gong
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Tongkun Liu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Yuhui Wang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China.
| | - Xilin Hou
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Ying Li
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Engineering Research Center of Germplasm Enhancement and Utilization of Horticultural Crops, Ministry of Education of the P. R. China, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China.
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5
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Yao X, Li R, Liu Y, Song P, Wu Z, Yan M, Luo J, Fan F, Wang Y. Feedback regulation of the isoprenoid pathway by SsdTPS overexpression has the potential to enhance plant tolerance to drought stress. PHYSIOLOGIA PLANTARUM 2024; 176:e14277. [PMID: 38566271 DOI: 10.1111/ppl.14277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 03/01/2024] [Accepted: 03/06/2024] [Indexed: 04/04/2024]
Abstract
In order to maintain the dynamic physiological balance, plants are compelled to adjust their energy metabolism and signal transduction to cope with the abiotic stresses caused by complex and changeable environments. The diterpenoid natural compound and secondary metabolites, sclareol, derived from Salvia sclarea, has gained significant attention owing to its economic value as a spice material and diverse physiological activities. Here, we focused on the roles and regulatory mechanisms of the sclareol diterpene synthase gene SsdTPS in the resistance of S. sclarea to abiotic stresses. Our results suggested that abiotic stresses could induce the response and upregulation of SsdTPS expression and isoprenoid pathway in S. sclarea. Ectopic expression of SsdTPS conferred drought tolerance in transgenic Arabidopsis, compared with wild-type. Overexpression of SsdTPS enhanced the transcription of ABA signal transduction synthetic regulators and induced the positive feedback upregulating key regulatory genes in the MEP pathway, thereby promoting the increase of ABA content and improving drought tolerance in transgenic plants. In addition, SsdTPS-overexpressed transgenic Arabidopsis improved the responses of stomatal regulatory genes and ROS scavenging enzyme activities and gene expression to drought stress. This promoted the stomatal closure and ROS reduction, thus enhancing water retention capacity and reducing oxidative stress damage. These findings unveil the potentially positive role of SsdTPS in orchestrating multiple regulatory mechanisms and maintaining homeostasis for improved abiotic stress resistance in S. sclarea, providing a novel insight into strategies for promoting drought resistance and cultivating highly tolerant plants.
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Affiliation(s)
- Xiangyu Yao
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Rui Li
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Yanan Liu
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Peng Song
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Ziyi Wu
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Meilin Yan
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Jinmei Luo
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
| | - Fenggui Fan
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
- Shaanxi Institute for Food and Drug Control, Shaanxi Key Laboratory of Food and Drug Safety Monitoring, China
| | - Yingjuan Wang
- State Key Laboratory of Biotechnology of Shannxi Province, Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, China
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6
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Agrawal V, Singh V, Tripathi BN. Components and processes involved in retrograde signaling from chloroplast to nucleus. PHYSIOLOGIA PLANTARUM 2023; 175:e13987. [PMID: 37616006 DOI: 10.1111/ppl.13987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 07/01/2023] [Accepted: 07/23/2023] [Indexed: 08/25/2023]
Abstract
Retrograde signaling conceptually means the transfer of signals from semi-autonomous cell organelles to the nucleus to modulate nuclear gene expression. A generalized explanation is that chloroplasts are highly sensitive to environmental stimuli and quickly generate signaling molecules (retrograde signals) and transport them to the nucleus through the cytosol to reprogram nuclear gene expression for cellular/metabolic adjustments to cope with environmental fluctuations. During the past decade, substantial advancements have been made in the area of retrograde signaling, including information on putative retrograde signals. Researchers have also proposed possible mechanisms for generating retrograde signals and their transmission. However, the exact mechanisms and processes responsible for transmitting retrograde signaling from the chloroplast to the nucleus remain elusive, demanding substantial attention. This review highlights strategies employed to detect retrograde signals, their possible modes of signaling to the nucleus, and their implications for cellular processes during stress conditions. The present review also summarizes the role of ROS-mediated retrograde signaling in plastid-nucleus communication and its functional significance in co-coordinating the physiological profile of plant cells.
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Affiliation(s)
- Variyata Agrawal
- Department of Biotechnology, Indira Gandhi National Tribal University, Amarkantak, India
| | - Vijetna Singh
- Department of Biotechnology, Indira Gandhi National Tribal University, Amarkantak, India
| | - Bhumi Nath Tripathi
- Department of Biotechnology, Indira Gandhi National Tribal University, Amarkantak, India
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7
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Wang YQ, Ye JJ, Yang HZ, Li D, Li XX, Wang YK, Zheng XQ, Ye JH, Li QS, Liang YR, Lu JL. Shading-Dependent Greening Process of the Leaves in the Light-Sensitive Albino Tea Plant 'Huangjinya': Possible Involvement of the Light-Harvesting Complex II Subunit of Photosystem II in the Phenotypic Characteristic. Int J Mol Sci 2023; 24:10314. [PMID: 37373460 DOI: 10.3390/ijms241210314] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
The light-sensitive albino tea plant can produce pale-yellow shoots with high levels of amino acids which are suitable to process high-quality tea. In order to understand the mechanism of the albino phenotype formation, the changes in the physio-chemical characteristics, chloroplast ultrastructure, chlorophyll-binding proteins, and the relevant gene expression were comprehensively investigated in the leaves of the light-sensitive albino cultivar 'Huangjinya' ('HJY') during short-term shading treatment. In the content of photosynthetic pigments, the ultrastructure of the chloroplast, and parameters of the photosynthesis in the leaves of 'HJY' could be gradually normalized along with the extension of the shading time, resulting in the leaf color transformed from pale yellow to green. BN-PAGE and SDS-PAGE revealed that function restoration of the photosynthetic apparatus was attributed to the proper formation of the pigment-protein complexes on the thylakoid membrane that benefited from the increased levels of the LHCII subunits in the shaded leaves of 'HJY', indicating the low level of LHCII subunits, especially the lack of the Lhcb1 might be responsible for the albino phenotype of the 'HJY' under natural light condition. The deficiency of the Lhcb1 was mainly subject to the strongly suppressed expression of the Lhcb1.x which might be modulated by the chloroplast retrograde signaling pathway GUN1 (GENOMES UNCOUPLED 1)-PTM (PHD type transcription factor with transmembrane domains)-ABI4 (ABSCISIC ACID INSENSITIVE 4).
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Affiliation(s)
- Ying-Qi Wang
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Jing-Jing Ye
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | | | - Da Li
- Institute of Sericulture and Tea, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Xiao-Xiang Li
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Yong-Kang Wang
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Xin-Qiang Zheng
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Jian-Hui Ye
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Qing-Sheng Li
- Institute of Sericulture and Tea, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Yue-Rong Liang
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Jian-Liang Lu
- Tea Research Institute, Zhejiang University, Hangzhou 310058, China
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8
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Redox Signaling in Plant Heat Stress Response. Antioxidants (Basel) 2023; 12:antiox12030605. [PMID: 36978852 PMCID: PMC10045013 DOI: 10.3390/antiox12030605] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
The increase in environmental temperature due to global warming is a critical threat to plant growth and productivity. Heat stress can cause impairment in several biochemical and physiological processes. Plants sense and respond to this adverse environmental condition by activating a plethora of defense systems. Among them, the heat stress response (HSR) involves an intricate network of heat shock factors (HSFs) and heat shock proteins (HSPs). However, a growing amount of evidence suggests that reactive oxygen species (ROS), besides potentially being responsible for cellular oxidative damage, can act as signal molecules in HSR, leading to adaptative responses. The role of ROS as toxic or signal molecules depends on the fine balance between their production and scavenging. Enzymatic and non-enzymatic antioxidants represent the first line of defense against oxidative damage and their activity is critical to maintaining an optimal redox environment. However, the HS-dependent ROS burst temporarily oxidizes the cellular environment, triggering redox-dependent signaling cascades. This review provides an overview of the redox-activated mechanisms that participate in the HSR.
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9
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Richter AS, Nägele T, Grimm B, Kaufmann K, Schroda M, Leister D, Kleine T. Retrograde signaling in plants: A critical review focusing on the GUN pathway and beyond. PLANT COMMUNICATIONS 2023; 4:100511. [PMID: 36575799 PMCID: PMC9860301 DOI: 10.1016/j.xplc.2022.100511] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/05/2022] [Accepted: 12/22/2022] [Indexed: 06/01/2023]
Abstract
Plastids communicate their developmental and physiological status to the nucleus via retrograde signaling, allowing nuclear gene expression to be adjusted appropriately. Signaling during plastid biogenesis and responses of mature chloroplasts to environmental changes are designated "biogenic" and "operational" controls, respectively. A prominent example of the investigation of biogenic signaling is the screen for gun (genomes uncoupled) mutants. Although the first five gun mutants were identified 30 years ago, the functions of GUN proteins in retrograde signaling remain controversial, and that of GUN1 is hotly disputed. Here, we provide background information and critically discuss recently proposed concepts that address GUN-related signaling and some novel gun mutants. Moreover, considering heme as a candidate in retrograde signaling, we revisit the spatial organization of heme biosynthesis and export from plastids. Although this review focuses on GUN pathways, we also highlight recent progress in the identification and elucidation of chloroplast-derived signals that regulate the acclimation response in green algae and plants. Here, stress-induced accumulation of unfolded/misassembled chloroplast proteins evokes a chloroplast-specific unfolded protein response, which leads to changes in the expression levels of nucleus-encoded chaperones and proteases to restore plastid protein homeostasis. We also address the importance of chloroplast-derived signals for activation of flavonoid biosynthesis leading to production of anthocyanins during stress acclimation through sucrose non-fermenting 1-related protein kinase 1. Finally, a framework for identification and quantification of intercompartmental signaling cascades at the proteomic and metabolomic levels is provided, and we discuss future directions of dissection of organelle-nucleus communication.
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Affiliation(s)
- Andreas S Richter
- Physiology of Plant Metabolism, Institute for Biosciences, University of Rostock, Albert-Einstein-Str. 3, 18059 Rostock, Germany
| | - Thomas Nägele
- Plant Evolutionary Cell Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, 82152 Planegg-Martinsried, Germany
| | - Bernhard Grimm
- Institute of Biology/Plant Physiology, Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - Kerstin Kaufmann
- Plant Cell and Molecular Biology, Institute of Biology, Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - Michael Schroda
- Molecular Biotechnology and Systems Biology, TU Kaiserslautern, Kaiserslautern, Germany
| | - Dario Leister
- Plant Molecular Biology (Botany), Faculty of Biology, Ludwig-Maximilians-Universität München, 82152 Planegg-Martinsried, Germany
| | - Tatjana Kleine
- Plant Molecular Biology (Botany), Faculty of Biology, Ludwig-Maximilians-Universität München, 82152 Planegg-Martinsried, Germany.
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10
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Lasorella C, Fortunato S, Dipierro N, Jeran N, Tadini L, Vita F, Pesaresi P, de Pinto MC. Chloroplast-localized GUN1 contributes to the acquisition of basal thermotolerance in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2022; 13:1058831. [PMID: 36618674 PMCID: PMC9813751 DOI: 10.3389/fpls.2022.1058831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
Heat stress (HS) severely affects different cellular compartments operating in metabolic processes and represents a critical threat to plant growth and yield. Chloroplasts are crucial for heat stress response (HSR), signaling to the nucleus the environmental challenge and adjusting metabolic and biosynthetic functions accordingly. GENOMES UNCOUPLED 1 (GUN1), a chloroplast-localized protein, has been recognized as one of the main players of chloroplast retrograde signaling. Here, we investigate HSR in Arabidopsis wild-type and gun1 plantlets subjected to 2 hours of HS at 45°C. In wild-type plants, Reactive Oxygen Species (ROS) accumulate promptly after HS, contributing to transiently oxidize the cellular environment and acting as signaling molecules. After 3 hours of physiological recovery at growth temperature (22°C), the induction of enzymatic and non-enzymatic antioxidants prevents oxidative damage. On the other hand, gun1 mutants fail to induce the oxidative burst immediately after HS and accumulate ROS and oxidative damage after 3 hours of recovery at 22°C, thus resulting in enhanced sensitivity to HS. These data suggest that GUN1 is required to oxidize the cellular environment, participating in the acquisition of basal thermotolerance through the redox-dependent plastid-to-nucleus communication.
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Affiliation(s)
- Cecilia Lasorella
- Department of Bioscience, Biotechnology and Environment University of Bari Aldo Moro, Bari, Italy
| | - Stefania Fortunato
- Department of Bioscience, Biotechnology and Environment University of Bari Aldo Moro, Bari, Italy
| | - Nunzio Dipierro
- Department of Bioscience, Biotechnology and Environment University of Bari Aldo Moro, Bari, Italy
| | - Nicolaj Jeran
- Department of Biosciences, University of Milano, Milano, Italy
| | - Luca Tadini
- Department of Biosciences, University of Milano, Milano, Italy
| | - Federico Vita
- Department of Bioscience, Biotechnology and Environment University of Bari Aldo Moro, Bari, Italy
| | - Paolo Pesaresi
- Department of Biosciences, University of Milano, Milano, Italy
| | - Maria Concetta de Pinto
- Department of Bioscience, Biotechnology and Environment University of Bari Aldo Moro, Bari, Italy
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11
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Griffin JHC, Toledo-Ortiz G. Plant photoreceptors and their signalling components in chloroplastic anterograde and retrograde communication. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:7126-7138. [PMID: 35640572 PMCID: PMC9675593 DOI: 10.1093/jxb/erac220] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/18/2022] [Indexed: 05/27/2023]
Abstract
The red phytochrome and blue cryptochrome plant photoreceptors play essential roles in promoting genome-wide changes in nuclear and chloroplastic gene expression for photomorphogenesis, plastid development, and greening. While their importance in anterograde signalling has been long recognized, the molecular mechanisms involved remain under active investigation. More recently, the intertwining of the light signalling cascades with the retrograde signals for the optimization of chloroplast functions has been acknowledged. Advances in the field support the participation of phytochromes, cryptochromes, and key light-modulated transcription factors, including HY5 and the PIFs, in the regulation of chloroplastic biochemical pathways that produce retrograde signals, including the tetrapyrroles and the chloroplastic MEP-isoprenoids. Interestingly, in a feedback loop, the photoreceptors and their signalling components are targets themselves of these retrograde signals, aimed at optimizing photomorphogenesis to the status of the chloroplasts, with GUN proteins functioning at the convergence points. High light and shade are also conditions where the photoreceptors tune growth responses to chloroplast functions. Interestingly, photoreceptors and retrograde signals also converge in the modulation of dual-localized proteins (chloroplastic/nuclear) including WHIRLY and HEMERA/pTAC12, whose functions are required for the optimization of photosynthetic activities in changing environments and are proposed to act themselves as retrograde signals.
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12
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The Single-Stranded DNA-Binding Gene Whirly ( Why1) with a Strong Pathogen-Induced Promoter from Vitis pseudoreticulata Enhances Resistance to Phytophthora capsici. Int J Mol Sci 2022; 23:ijms23148052. [PMID: 35887401 PMCID: PMC9315732 DOI: 10.3390/ijms23148052] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/11/2022] [Accepted: 07/19/2022] [Indexed: 01/09/2023] Open
Abstract
Vitis vinifera plants are disease-susceptible while Vitis pseudoreticulata plants are disease-resistant; however, the molecular mechanism remains unclear. In this study, the single-stranded DNA- and RNA-binding protein gene Whirly (VvWhy1 and VpWhy1) were cloned from V. vinifera "Cabernet Sauvignon" and V. pseudoreticulata "HD1". VvWhy1 and VpWhy1 promoter sequences (pVv and pVp) were also isolated; however, the identity of the promoter sequences was far lower than that between the Why1 coding sequences (CDSs). Both Why1 gene sequences had seven exons and six introns, and they had a C-terminal Whirly conserved domain and N-terminal chloroplast transit peptide, which was then verified to be chloroplast localization. Transcriptional expression showed that VpWhy1 was strongly induced by Plasmopara viticola, while VvWhy1 showed a low expression level. Further, the GUS activity indicated pVp had high activity involved in response to Phytophthora capsici infection. In addition, Nicotiana benthamiana transiently expressing pVp::VvWhy1 and pVp::VpWhy1 enhanced the P. capsici resistance. Moreover, Why1, PR1 and PR10 were upregulated in pVp transgenic N. benthamiana leaves. This research presented a novel insight into disease resistance mechanism that pVp promoted the transcription of Why1, which subsequently regulated the expression of PR1 and PR10, further enhancing the resistance to P. capsici.
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13
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A proteostasis network safeguards the chloroplast proteome. Essays Biochem 2022; 66:219-228. [PMID: 35670042 PMCID: PMC9400067 DOI: 10.1042/ebc20210058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 05/17/2022] [Accepted: 05/25/2022] [Indexed: 12/12/2022]
Abstract
Several protein homeostasis (proteostasis) pathways safeguard the integrity of thousands of proteins that localize in plant chloroplasts, the indispensable organelles that perform photosynthesis, produce metabolites, and sense environmental stimuli. In this review, we discuss the latest efforts directed to define the molecular process by which proteins are imported and sorted into the chloroplast. Moreover, we describe the recently elucidated protein folding and degradation pathways that modulate the levels and activities of chloroplast proteins. We also discuss the links between the accumulation of misfolded proteins and the activation of signalling pathways that cope with folding stress within the organelle. Finally, we propose new research directions that would help to elucidate novel molecular mechanisms to maintain chloroplast proteostasis.
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14
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Fujii S, Kobayashi K, Lin YC, Liu YC, Nakamura Y, Wada H. Impacts of phosphatidylglycerol on plastid gene expression and light induction of nuclear photosynthetic genes. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:2952-2970. [PMID: 35560187 DOI: 10.1093/jxb/erac034] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 01/31/2022] [Indexed: 06/15/2023]
Abstract
Phosphatidylglycerol (PG) is the only major phospholipid in the thylakoid membrane of chloroplasts. PG is essential for photosynthesis, and loss of PG in Arabidopsis thaliana results in severe defects of growth and chloroplast development, with decreased chlorophyll accumulation, impaired thylakoid formation, and down-regulation of photosynthesis-associated genes encoded in nuclear and plastid genomes. However, how the absence of PG affects gene expression and plant growth remains unclear. To elucidate this mechanism, we investigated transcriptional profiles of a PG-deficient Arabidopsis mutant pgp1-2 under various light conditions. Microarray analysis demonstrated that reactive oxygen species (ROS)-responsive genes were up-regulated in pgp1-2. However, ROS production was not enhanced in the mutant even under strong light, indicating limited impacts of photooxidative stress on the defects of pgp1-2. Illumination to dark-adapted pgp1-2 triggered down-regulation of photosynthesis-associated nuclear-encoded genes (PhANGs), while plastid-encoded genes were constantly suppressed. Overexpression of GOLDEN2-LIKE1 (GLK1), a transcription factor gene regulating chloroplast development, in pgp1-2 up-regulated PhANGs but not plastid-encoded genes along with chlorophyll accumulation. Our data suggest a broad impact of PG biosynthesis on nuclear-encoded genes partially via GLK1 and a specific involvement of this lipid in plastid gene expression and plant development.
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Affiliation(s)
- Sho Fujii
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, Japan
- Department of Botany, Graduate School of Science, Kyoto University, Kita-Shirakawa Oiwake-cho, Sakyo-ku, Kyoto, Japan
| | - Koichi Kobayashi
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuencho, Naka-ku, Sakai, Osaka, Japan
- Faculty of Liberal Arts and Sciences, Osaka Prefecture University, 1-1 Gakuencho, Naka-ku, Sakai, Osaka, Japan
| | - Ying-Chen Lin
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Yu-Chi Liu
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Yuki Nakamura
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
- RIKEN Center for Sustainable Resource Science (CSRS), Yokohama, Japan
| | - Hajime Wada
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, Japan
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15
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Veciana N, Martín G, Leivar P, Monte E. BBX16 mediates the repression of seedling photomorphogenesis downstream of the GUN1/GLK1 module during retrograde signalling. THE NEW PHYTOLOGIST 2022; 234:93-106. [PMID: 35043407 PMCID: PMC9305768 DOI: 10.1111/nph.17975] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 01/05/2022] [Indexed: 05/03/2023]
Abstract
Plastid-to-nucleus retrograde signalling (RS) initiated by dysfunctional chloroplasts impact photomorphogenic development. We have previously shown that the transcription factor GLK1 acts downstream of the RS regulator GUN1 in photodamaging conditions to regulate not only the well established expression of photosynthesis-associated nuclear genes (PhANGs) but also to regulate seedling morphogenesis. Specifically, the GUN1/GLK1 module inhibits the light-induced phytochrome-interacting factor (PIF)-repressed transcriptional network to suppress cotyledon development when chloroplast integrity is compromised, modulating the area exposed to potentially damaging high light. However, how the GUN1/GLK1 module inhibits photomorphogenesis upon chloroplast damage remained undefined. Here, we report the identification of BBX16 as a novel direct target of GLK1. BBX16 is induced and promotes photomorphogenesis in moderate light and is repressed via GUN1/GLK1 after chloroplast damage. Additionally, we showed that BBX16 represents a regulatory branching point downstream of GUN1/GLK1 in the regulation of PhANG expression and seedling development upon RS activation. The gun1 phenotype in lincomycin and the gun1-like phenotype of GLK1OX are markedly suppressed in gun1bbx16 and GLK1OXbbx16. This study identified BBX16 as the first member of the BBX family involved in RS, and defines a molecular bifurcation mechanism operated by GLK1/BBX16 to optimise seedling de-etiolation, and to ensure photoprotection in unfavourable light conditions.
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Affiliation(s)
- Nil Veciana
- Centre for Research in Agricultural Genomics (CRAG) CSIC‐IRTA‐UAB‐UBCampus UAB, Bellaterra08193BarcelonaSpain
| | - Guiomar Martín
- Centre for Research in Agricultural Genomics (CRAG) CSIC‐IRTA‐UAB‐UBCampus UAB, Bellaterra08193BarcelonaSpain
| | - Pablo Leivar
- Laboratory of BiochemistryInstitut Químic de SarriàUniversitat Ramon Llull08017BarcelonaSpain
| | - Elena Monte
- Centre for Research in Agricultural Genomics (CRAG) CSIC‐IRTA‐UAB‐UBCampus UAB, Bellaterra08193BarcelonaSpain
- Consejo Superior de Investigaciones Científicas (CSIC)08028BarcelonaSpain
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16
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Ashykhmina N, Chan KX, Frerigmann H, Van Breusegem F, Kopriva S, Flügge UI, Gigolashvili T. Dissecting the Role of SAL1 in Metabolizing the Stress Signaling Molecule 3′-Phosphoadenosine 5′-Phosphate in Different Cell Compartments. Front Mol Biosci 2022; 8:763795. [PMID: 35127814 PMCID: PMC8815814 DOI: 10.3389/fmolb.2021.763795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 11/24/2021] [Indexed: 11/24/2022] Open
Abstract
Plants possess the most highly compartmentalized eukaryotic cells. To coordinate their intracellular functions, plastids and the mitochondria are dependent on the flow of information to and from the nuclei, known as retrograde and anterograde signals. One mobile retrograde signaling molecule is the monophosphate 3′-phosphoadenosine 5′-phosphate (PAP), which is mainly produced from 3′-phosphoadenosine 5′-phosphosulfate (PAPS) in the cytosol and regulates the expression of a set of nuclear genes that modulate plant growth in response to biotic and abiotic stresses. The adenosine bisphosphate phosphatase enzyme SAL1 dephosphorylates PAP to AMP in plastids and the mitochondria, but can also rescue sal1 Arabidopsis phenotypes (PAP accumulation, leaf morphology, growth, etc.) when expressed in the cytosol and the nucleus. To understand better the roles of the SAL1 protein in chloroplasts, the mitochondria, nuclei, and the cytosol, we have attempted to complement the sal1 mutant by specifically cargoing the transgenic SAL1 protein to these four cell compartments. Overexpression of SAL1 protein targeted to the nucleus or the mitochondria alone, or co-targeted to chloroplasts and the mitochondria, complemented most aspects of the sal1 phenotypes. Notably, targeting SAL1 to chloroplasts or the cytosol did not effectively rescue the sal1 phenotypes as these transgenic lines accumulated very low levels of SAL1 protein despite overexpressing SAL1 mRNA, suggesting a possibly lower stability of the SAL1 protein in these compartments. The diverse transgenic SAL1 lines exhibited a range of PAP levels. The latter needs to reach certain thresholds in the cell for its impacts on different processes such as leaf growth, regulation of rosette morphology, sulfate homeostasis, and glucosinolate biosynthesis. Collectively, these findings provide an initial platform for further dissection of the role of the SAL1–PAP pathway in different cellular processes under stress conditions.
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Affiliation(s)
- Natallia Ashykhmina
- Institute for Plant Sciences, Cologne Biocenter, University of Cologne, Cologne, Germany
| | - Kai Xun Chan
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium
- VIB Center for Plant Systems Biology, Ghent, Belgium
| | | | - Frank Van Breusegem
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium
- VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Stanislav Kopriva
- Institute for Plant Sciences, Cologne Biocenter, University of Cologne, Cologne, Germany
| | - Ulf-Ingo Flügge
- Institute for Plant Sciences, Cologne Biocenter, University of Cologne, Cologne, Germany
| | - Tamara Gigolashvili
- Institute for Plant Sciences, Cologne Biocenter, University of Cologne, Cologne, Germany
- *Correspondence: Tamara Gigolashvili,
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17
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Screening and Identification of Candidate GUN1-Interacting Proteins in Arabidopsis thaliana. Int J Mol Sci 2021; 22:ijms222111364. [PMID: 34768794 PMCID: PMC8583188 DOI: 10.3390/ijms222111364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/18/2021] [Accepted: 10/18/2021] [Indexed: 11/17/2022] Open
Abstract
Chloroplasts are semi-autonomous organelles governed by the precise coordination between the genomes of their own and the nucleus for functioning correctly in response to developmental and environmental cues. Under stressed conditions, various plastid-to-nucleus retrograde signals are generated to regulate the expression of a large number of nuclear genes for acclimation. Among these retrograde signaling pathways, the chloroplast protein GENOMES UNCOUPLED 1 (GUN1) is the first component identified. However, in addition to integrating aberrant physiological signals when chloroplasts are challenged by stresses such as photooxidative damage or the inhibition of plastid gene expression, GUN1 was also found to regulate other developmental processes such as flowering. Several partner proteins have been found to interact with GUN1 and facilitate its different regulatory functions. In this study, we report 15 possible interacting proteins identified through yeast two-hybrid (Y2H) screening, among which 11 showed positive interactions by pair-wise Y2H assay. Through the bimolecular fluorescence complementation assay in Arabidopsis protoplasts, two candidate proteins with chloroplast localization, DJC31 and HCF145, were confirmed to interact with GUN1 in planta. Genes for these GUN1-interacting proteins showed different fluctuations in the WT and gun1 mutant under norflurazon and lincomycin treatments. Our results provide novel clues for a better understanding of molecular mechanisms underlying GUN1-mediated regulations.
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18
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Abstract
Plants cannot move, so they must endure abiotic stresses such as drought, salinity and extreme temperatures. These stressors greatly limit the distribution of plants, alter their growth and development, and reduce crop productivity. Recent progress in our understanding of the molecular mechanisms underlying the responses of plants to abiotic stresses emphasizes their multilevel nature; multiple processes are involved, including sensing, signalling, transcription, transcript processing, translation and post-translational protein modifications. This improved knowledge can be used to boost crop productivity and agricultural sustainability through genetic, chemical and microbial approaches.
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19
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Jha SG, Borowsky AT, Cole BJ, Fahlgren N, Farmer A, Huang SSC, Karia P, Libault M, Provart NJ, Rice SL, Saura-Sanchez M, Agarwal P, Ahkami AH, Anderton CR, Briggs SP, Brophy JAN, Denolf P, Di Costanzo LF, Exposito-Alonso M, Giacomello S, Gomez-Cano F, Kaufmann K, Ko DK, Kumar S, Malkovskiy AV, Nakayama N, Obata T, Otegui MS, Palfalvi G, Quezada-Rodríguez EH, Singh R, Uhrig RG, Waese J, Van Wijk K, Wright RC, Ehrhardt DW, Birnbaum KD, Rhee SY. Vision, challenges and opportunities for a Plant Cell Atlas. eLife 2021; 10:e66877. [PMID: 34491200 PMCID: PMC8423441 DOI: 10.7554/elife.66877] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 08/26/2021] [Indexed: 02/06/2023] Open
Abstract
With growing populations and pressing environmental problems, future economies will be increasingly plant-based. Now is the time to reimagine plant science as a critical component of fundamental science, agriculture, environmental stewardship, energy, technology and healthcare. This effort requires a conceptual and technological framework to identify and map all cell types, and to comprehensively annotate the localization and organization of molecules at cellular and tissue levels. This framework, called the Plant Cell Atlas (PCA), will be critical for understanding and engineering plant development, physiology and environmental responses. A workshop was convened to discuss the purpose and utility of such an initiative, resulting in a roadmap that acknowledges the current knowledge gaps and technical challenges, and underscores how the PCA initiative can help to overcome them.
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Affiliation(s)
- Suryatapa Ghosh Jha
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
| | - Alexander T Borowsky
- Department of Botany and Plant Sciences, University of California, RiversideRiversideUnited States
| | - Benjamin J Cole
- Joint Genome Institute, Lawrence Berkeley National LaboratoryWalnut CreekUnited States
| | - Noah Fahlgren
- Donald Danforth Plant Science CenterSt. LouisUnited States
| | - Andrew Farmer
- National Center for Genome ResourcesSanta FeUnited States
| | | | - Purva Karia
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
- Department of Cell and Systems Biology, University of TorontoTorontoCanada
| | - Marc Libault
- Department of Agronomy and Horticulture, University of Nebraska-LincolnLincolnUnited States
| | - Nicholas J Provart
- Department of Cell and Systems Biology and the Centre for the Analysis of Genome Evolution and Function, University of TorontoTorontoCanada
| | - Selena L Rice
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
| | - Maite Saura-Sanchez
- Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, Universidad de Buenos AiresBuenos AiresArgentina
| | - Pinky Agarwal
- National Institute of Plant Genome ResearchNew DelhiIndia
| | - Amir H Ahkami
- Environmental Molecular Sciences Division, Pacific Northwest National LaboratoryRichlandUnited States
| | - Christopher R Anderton
- Environmental Molecular Sciences Division, Pacific Northwest National LaboratoryRichlandUnited States
| | - Steven P Briggs
- Department of Biological Sciences, University of California, San DiegoSan DiegoUnited States
| | | | | | - Luigi F Di Costanzo
- Department of Agricultural Sciences, University of Naples Federico IINapoliItaly
| | - Moises Exposito-Alonso
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
- Department of Plant Biology, Carnegie Institution for ScienceTübingenGermany
| | | | - Fabio Gomez-Cano
- Department of Biochemistry and Molecular Biology, Michigan State UniversityEast LansingUnited States
| | - Kerstin Kaufmann
- Department for Plant Cell and Molecular Biology, Institute for Biology, Humboldt-Universitaet zu BerlinBerlinGermany
| | - Dae Kwan Ko
- Great Lakes Bioenergy Research Center, Michigan State UniversityEast LansingUnited States
| | - Sagar Kumar
- Department of Plant Breeding & Genetics, Mata Gujri College, Fatehgarh Sahib, Punjabi UniversityPatialaIndia
| | - Andrey V Malkovskiy
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
| | - Naomi Nakayama
- Department of Bioengineering, Imperial College LondonLondonUnited Kingdom
| | - Toshihiro Obata
- Department of Biochemistry, University of Nebraska-LincolnMadisonUnited States
| | - Marisa S Otegui
- Department of Botany, University of Wisconsin-MadisonMadisonUnited States
| | - Gergo Palfalvi
- Division of Evolutionary Biology, National Institute for Basic BiologyOkazakiJapan
| | - Elsa H Quezada-Rodríguez
- Ciencias Agrogenómicas, Escuela Nacional de Estudios Superiores Unidad León, Universidad Nacional Autónoma de MéxicoLeónMexico
| | - Rajveer Singh
- School of Agricultural Biotechnology, Punjab Agricultural UniversityLudhianaIndia
| | - R Glen Uhrig
- Department of Science, University of AlbertaEdmontonCanada
| | - Jamie Waese
- Department of Cell and Systems Biology/Centre for the Analysis of Genome Evolution and Function, University of TorontoTorontoCanada
| | - Klaas Van Wijk
- School of Integrated Plant Science, Plant Biology Section, Cornell UniversityIthacaUnited States
| | - R Clay Wright
- Department of Biological Systems Engineering, Virginia TechBlacksburgUnited States
| | - David W Ehrhardt
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
| | - Kenneth D Birnbaum
- Center for Genomics and Systems Biology, New York UniversityNew YorkUnited States
| | - Seung Y Rhee
- Department of Plant Biology, Carnegie Institution for ScienceStanfordUnited States
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20
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Wu GZ, Bock R. GUN control in retrograde signaling: How GENOMES UNCOUPLED proteins adjust nuclear gene expression to plastid biogenesis. THE PLANT CELL 2021; 33:457-474. [PMID: 33955483 PMCID: PMC8136882 DOI: 10.1093/plcell/koaa048] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 12/03/2020] [Indexed: 05/08/2023]
Abstract
Communication between cellular compartments is vital for development and environmental adaptation. Signals emanating from organelles, so-called retrograde signals, coordinate nuclear gene expression with the developmental stage and/or the functional status of the organelle. Plastids (best known in their green photosynthesizing differentiated form, the chloroplasts) are the primary energy-producing compartment of plant cells, and the site for the biosynthesis of many metabolites, including fatty acids, amino acids, nucleotides, isoprenoids, tetrapyrroles, vitamins, and phytohormone precursors. Signals derived from plastids regulate the accumulation of a large set of nucleus-encoded proteins, many of which localize to plastids. A set of mutants defective in retrograde signaling (genomes uncoupled, or gun) was isolated over 25 years ago. While most GUN genes act in tetrapyrrole biosynthesis, resolving the molecular function of GUN1, the proposed integrator of multiple retrograde signals, has turned out to be particularly challenging. Based on its amino acid sequence, GUN1 was initially predicted to be a plastid-localized nucleic acid-binding protein. Only recently, mechanistic information on the function of GUN1 has been obtained, pointing to a role in plastid protein homeostasis. This review article summarizes our current understanding of GUN-related retrograde signaling and provides a critical appraisal of the various proposed roles for GUNs and their respective pathways.
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Affiliation(s)
- Guo-Zhang Wu
- Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China
| | - Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
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21
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Escobar-Tovar L, Sierra J, Hernández-Muñoz A, McQuinn RP, Mathioni S, Cordoba E, Colas des Francs-Small C, Meyers BC, Pogson B, León P. Deconvoluting apocarotenoid-mediated retrograde signaling networks regulating plastid translation and leaf development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:1582-1599. [PMID: 33340183 DOI: 10.1111/tpj.15134] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
Signals originating within plastids modulate organelle differentiation by transcriptionally regulating nuclear-encoded genes. These retrograde signals are also integral regulators of plant development, including leaf morphology. The clb5 mutant displays severe leaf morphology defects due to Apocarotenoid Signal 1 (ACS1) accumulation in the developmentally arrested plastid. Transcriptomic analysis of clb5 validates that ACS1 accumulation deregulates hundreds of nuclear genes, including the suppression of most genes encoding plastid ribosomal proteins. Herein, we order the molecular events causing the leaf phenotype associated with the accumulation of ACS1, which includes two consecutive retrograde signaling cascades. Firstly, ACS1 originating in the plastid drives inhibition of plastid translation (IPT) via nuclear transcriptome remodeling of chlororibosomal proteins, requiring light as an essential component. Subsequently, IPT results in leaf morphological defects via a GUN1-dependent pathway shared with seedlings undergoing chemical IPT treatments and is restricted to an early window of the leaf development. Collectively, this work advances our understanding of the complexity within plastid retrograde signaling exemplified by sequential signal exchange and consequences that in a particular temporal and spatial context contribute to the modulation of leaf development.
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Affiliation(s)
- Lina Escobar-Tovar
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Julio Sierra
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Arihel Hernández-Muñoz
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Ryan P McQuinn
- Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA
| | - Sandra Mathioni
- Division of Plant Sciences, University of Missouri-Columbia, Columbia, MO, 65211, USA
- Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 0200, Australia
| | - Elizabeth Cordoba
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Catherine Colas des Francs-Small
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Blake C Meyers
- Division of Plant Sciences, University of Missouri-Columbia, Columbia, MO, 65211, USA
- Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 0200, Australia
| | - Barry Pogson
- Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA
| | - Patricia León
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, Mexico
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22
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Gommers CMM, Ruiz-Sola MÁ, Ayats A, Pereira L, Pujol M, Monte E. GENOMES UNCOUPLED1-independent retrograde signaling targets the ethylene pathway to repress photomorphogenesis. PLANT PHYSIOLOGY 2021; 185:67-76. [PMID: 33631804 PMCID: PMC8133597 DOI: 10.1093/plphys/kiaa015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 09/22/2020] [Indexed: 05/03/2023]
Abstract
When germinating in the light, Arabidopsis (Arabidopsis thaliana) seedlings undergo photomorphogenic development, characterized by short hypocotyls, greening, and expanded cotyledons. Stressed chloroplasts emit retrograde signals to the nucleus that induce developmental responses and repress photomorphogenesis. The nuclear targets of these retrograde signals are not yet fully known. Here, we show that lincomycin-treated seedlings (which lack developed chloroplasts) show strong phenotypic similarities to seedlings treated with ethylene (ET) precursor 1-aminocyclopropane-1-carboxylic acid, as both signals inhibit cotyledon separation in the light. We show that the lincomycin-induced phenotype partly requires a functioning ET signaling pathway, but could not detect increased ET emissions in response to the lincomycin treatment. The two treatments show overlap in upregulated gene transcripts, downstream of transcription factors ETHYLENE INSENSITIVE3 and EIN3-LIKE1. The induction of the ET signaling pathway is triggered by an unknown retrograde signal acting independently of GENOMES UNCOUPLED1. Our data show how two apparently different stress responses converge to optimize photomorphogenesis.
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Affiliation(s)
- Charlotte M M Gommers
- Plant Development and Signal Transduction Program, Center for Research in Agricultural Genomics (CSIC- IRTA-UAB-UB), Barcelona, Spain
- Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
| | - María Águila Ruiz-Sola
- Plant Development and Signal Transduction Program, Center for Research in Agricultural Genomics (CSIC- IRTA-UAB-UB), Barcelona, Spain
| | - Alba Ayats
- Plant Development and Signal Transduction Program, Center for Research in Agricultural Genomics (CSIC- IRTA-UAB-UB), Barcelona, Spain
| | - Lara Pereira
- Plant and Animal Genomics Program, Center for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Barcelona, Spain
- Present address: Center for Applied Genetic Technologies, University of Georgia, Athens, USA
| | - Marta Pujol
- Plant and Animal Genomics Program, Center for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Barcelona, Spain
- Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Barcelona, Spain
| | - Elena Monte
- Plant Development and Signal Transduction Program, Center for Research in Agricultural Genomics (CSIC- IRTA-UAB-UB), Barcelona, Spain
- Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain
- Author for communication: (E.M.)
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23
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Alamdari K, Fisher KE, Sinson AB, Chory J, Woodson JD. Roles for the chloroplast-localized pentatricopeptide repeat protein 30 and the 'mitochondrial' transcription termination factor 9 in chloroplast quality control. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 104:735-751. [PMID: 32779277 DOI: 10.1111/tpj.14963] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 07/20/2020] [Indexed: 05/11/2023]
Abstract
Chloroplasts constantly experience photo-oxidative stress while performing photosynthesis. This is particularly true under abiotic stresses that lead to the accumulation of reactive oxygen species (ROS) which oxidize DNA, proteins and lipids. Reactive oxygen species can also act as signals to induce acclimation through chloroplast degradation, cell death and nuclear gene expression. To better understand the mechanisms behind ROS signaling from chloroplasts, we have used the Arabidopsis thaliana mutant plastid ferrochelatase two (fc2) that conditionally accumulates the ROS singlet oxygen (1 O2 ) leading to chloroplast degradation and eventually cell death. Here we have mapped mutations that suppress chloroplast degradation in the fc2 mutant and demonstrate that they affect two independent loci (PPR30 and mTERF9) encoding chloroplast proteins predicted to be involved in post-transcriptional gene expression. These mutants exhibited broadly reduced chloroplast gene expression, impaired chloroplast development and reduced chloroplast stress signaling. Levels of 1 O2 , however, could be uncoupled from chloroplast degradation, suggesting that PPR30 and mTERF9 are involved in ROS signaling pathways. In the wild-type background, ppr30 and mTERF9 mutants were also observed to be less susceptible to cell death induced by excess light stress. While broad inhibition of plastid transcription with rifampicin was also able to suppress cell death in fc2 mutants, specific reductions in plastid gene expression using other mutations was not always sufficient. Together these results suggest that plastid gene expression, or the expression of specific plastid genes by PPR30 and mTERF0, is a necessary prerequisite for chloroplasts to activate the 1 O2 signaling pathways to induce chloroplast quality control pathways and/or cell death.
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Affiliation(s)
- Kamran Alamdari
- The School of Plant Sciences, University of Arizona, 1140 E. South Campus Drive, 303 Forbes Building, Tucson, AZ, 85721, USA
| | - Karen E Fisher
- The School of Plant Sciences, University of Arizona, 1140 E. South Campus Drive, 303 Forbes Building, Tucson, AZ, 85721, USA
| | - Andrew B Sinson
- The Division of Biological Sciences, The University of California San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
- Plant Biology Laboratory, The Salk Institute, 10010 N Torrey Pines Rd, La Jolla, CA, 92037, USA
| | - Joanne Chory
- Plant Biology Laboratory, The Salk Institute, 10010 N Torrey Pines Rd, La Jolla, CA, 92037, USA
- Howard Hughes Medical Institute, The Salk Institute, 10010 N Torrey Pines Rd, La Jolla, CA, 92037, USA
| | - Jesse D Woodson
- The School of Plant Sciences, University of Arizona, 1140 E. South Campus Drive, 303 Forbes Building, Tucson, AZ, 85721, USA
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24
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Lidón-Soto A, Núñez-Delegido E, Pastor-Martínez I, Robles P, Quesada V. Arabidopsis Plastid-RNA Polymerase RPOTp Is Involved in Abiotic Stress Tolerance. PLANTS (BASEL, SWITZERLAND) 2020; 9:E834. [PMID: 32630785 PMCID: PMC7412009 DOI: 10.3390/plants9070834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 06/25/2020] [Accepted: 06/29/2020] [Indexed: 05/05/2023]
Abstract
Plastid gene expression (PGE) must adequately respond to changes in both development and environmental cues. The transcriptional machinery of plastids in land plants is far more complex than that of prokaryotes. Two types of DNA-dependent RNA polymerases transcribe the plastid genome: a multimeric plastid-encoded polymerase (PEP), and a monomeric nuclear-encoded polymerase (NEP). A single NEP in monocots (RPOTp, RNA polymerase of the T3/T7 phage-type) and two NEPs in dicots (plastid-targeted RPOTp, and plastid- and mitochondrial-targeted RPOTmp) have been hitherto identified. To unravel the role of PGE in plant responses to abiotic stress, we investigated if Arabidopsis RPOTp could function in plant salt tolerance. To this end, we studied the sensitivity of T-DNA mutants scabra3-2 (sca3-2) and sca3-3, defective in the RPOTp gene, to salinity, osmotic stress and the phytohormone abscisic acid (ABA) required for plants to adapt to abiotic stress. sca3 mutants were hypersensitive to NaCl, mannitol and ABA during germination and seedling establishment. Later in development, sca3 plants displayed reduced sensitivity to salt stress. A gene ontology (GO) analysis of the nuclear genes differentially expressed in the sca3-2 mutant (301) revealed that many significantly enriched GO terms were related to chloroplast function, and also to the response to several abiotic stresses. By quantitative RT-PCR (qRT-PCR), we found that genes LHCB1 (LIGHT-HARVESTING CHLOROPHYLL a/b-BINDING1) and AOX1A (ALTERNATIVE OXIDASE 1A) were respectively down- and up-regulated in the Columbia-0 (Col-0) salt-stressed plants, which suggests the activation of plastid and mitochondria-to-nucleus retrograde signaling. The transcript levels of genes RPOTp, RPOTmp and RPOTm significantly increased in these salt-stressed seedlings, but this enhanced expression did not lead to the up-regulation of the plastid genes solely transcribed by NEP. Similar to salinity, carotenoid inhibitor norflurazon (NF) also enhanced the RPOTp transcript levels in Col-0 seedlings. This shows that besides salinity, inhibition of chloroplast biogenesis also induces RPOTp expression. Unlike salt and NF, the NEP genes were significantly down-regulated in the Col-0 seedlings grown in ABA-supplemented media. Together, our findings demonstrate that RPOTp functions in abiotic stress tolerance, and RPOTp is likely regulated positively by plastid-to-nucleus retrograde signaling, which is triggered when chloroplast functionality is perturbed by environmental stresses, e.g., salinity or NF. This suggests the existence of a compensatory mechanism, elicited by impaired chloroplast function. To our knowledge, this is the first study to suggest the role of a nuclear-encoded plastid-RNA polymerase in salt stress tolerance in plants.
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Affiliation(s)
| | | | | | | | - Víctor Quesada
- Instituto de Bioingeniería, Universidad Miguel Hernández, Campus de Elche, 03202 Elche, Spain; (A.L.-S.); (E.N.-D.); (I.P.-M.); (P.R.)
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25
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Richter AS, Tohge T, Fernie AR, Grimm B. The genomes uncoupled-dependent signalling pathway coordinates plastid biogenesis with the synthesis of anthocyanins. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190403. [PMID: 32362259 DOI: 10.1098/rstb.2019.0403] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In recent years, it has become evident that plants perceive, integrate and communicate abiotic stress signals through chloroplasts. During the process of acclimation plastid-derived, retrograde signals control nuclear gene expression in response to developmental and environmental cues leading to complex genetic and metabolic reprogramming to preserve cellular homeostasis under challenging environmental conditions. Upon stress-induced dysfunction of chloroplasts, GENOMES UNCOUPLED (GUN) proteins participate in the repression of PHOTOSYNTHESIS-ASSOCIATED NUCLEAR GENES (PHANGs). Here, we show that the retrograde signal emitted by, or communicated through, GUN-proteins is also essential to induce the accumulation of photoprotective anthocyanin pigments when chloroplast development is attenuated. Comparative whole transcriptome sequencing and genetic analysis reveal GUN1 and GUN5-dependent signals as a source for the regulation of genes involved in anthocyanin biosynthesis. The signal transduction cascade includes well-known transcription factors for the control of anthocyanin biosynthesis, which are deregulated in gun mutants. We propose that regulation of PHANGs and genes contributing to anthocyanin biosynthesis are two, albeit oppositely, co-regulated processes during plastid biogenesis. This article is part of the theme issue 'Retrograde signalling from endosymbiotic organelles'.
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Affiliation(s)
- Andreas S Richter
- Plant Physiology, Institute of Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany.,Physiology of Plant Cell Organelles, Institute of Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany
| | - Takayuki Tohge
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Bernhard Grimm
- Plant Physiology, Institute of Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany
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26
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Wang Y, Selinski J, Mao C, Zhu Y, Berkowitz O, Whelan J. Linking mitochondrial and chloroplast retrograde signalling in plants. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190410. [PMID: 32362265 PMCID: PMC7209950 DOI: 10.1098/rstb.2019.0410] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Retrograde signalling refers to the regulation of nuclear gene expression in response to functional changes in organelles. In plants, the two energy-converting organelles, mitochondria and chloroplasts, are tightly coordinated to balance their activities. Although our understanding of components involved in retrograde signalling has greatly increased in the last decade, studies on the regulation of the two organelle signalling pathways have been largely independent. Thus, the mechanism of how mitochondrial and chloroplastic retrograde signals are integrated is largely unknown. Here, we summarize recent findings on the function of mitochondrial signalling components and their links to chloroplast retrograde responses. From this, a picture emerges showing that the major regulators are integrators of both organellar retrograde signalling pathways. This article is part of the theme issue 'Retrograde signalling from endosymbiotic organelles'.
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Affiliation(s)
- Yan Wang
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - Jennifer Selinski
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - Chunli Mao
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia.,Department of Animal Science and Technology, Grassland Science, China Agricultural University, Beijing 100193, People's Republic of China
| | - Yanqiao Zhu
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia.,Department of Animal Science and Technology, Grassland Science, China Agricultural University, Beijing 100193, People's Republic of China
| | - Oliver Berkowitz
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - James Whelan
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
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27
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Armarego-Marriott T, Sandoval-Ibañez O, Kowalewska Ł. Beyond the darkness: recent lessons from etiolation and de-etiolation studies. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:1215-1225. [PMID: 31854450 PMCID: PMC7031072 DOI: 10.1093/jxb/erz496] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 11/29/2019] [Indexed: 05/06/2023]
Abstract
The state of etiolation is generally defined by the presence of non-green plastids (etioplasts) in plant tissues that would normally contain chloroplasts. In the commonly used dark-grown seedling system, etiolation is coupled with a type of growth called skotomorphogenesis. Upon illumination, de-etiolation occurs, marked by the transition from etioplast to chloroplast, and, at the seedling level, a switch to photomorphogenic growth. Etiolation and de-etiolation systems are therefore important for understanding both the acquisition of photosynthetic capacity during chloroplast biogenesis and plant responses to light-the most relevant signal in the life and growth of the organism. In this review, we discuss recent discoveries (within the past 2-3 years) in the field of etiolation and de-etiolation, with a particular focus on post-transcriptional processes and ultrastructural changes. We further discuss ambiguities in definitions of the term 'etiolation', and benefits and biases of common etiolation/de-etiolation systems. Finally, we raise several open questions and future research possibilities.
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Affiliation(s)
| | | | - Łucja Kowalewska
- Faculty of Biology, Department of Plant Anatomy and Cytology, University of Warsaw, Warszawa, Poland
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28
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Kretschmer M, Damoo D, Djamei A, Kronstad J. Chloroplasts and Plant Immunity: Where Are the Fungal Effectors? Pathogens 2019; 9:E19. [PMID: 31878153 PMCID: PMC7168614 DOI: 10.3390/pathogens9010019] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 12/17/2019] [Accepted: 12/21/2019] [Indexed: 12/12/2022] Open
Abstract
Chloroplasts play a central role in plant immunity through the synthesis of secondary metabolites and defense compounds, as well as phytohormones, such as jasmonic acid and salicylic acid. Additionally, chloroplast metabolism results in the production of reactive oxygen species and nitric oxide as defense molecules. The impact of viral and bacterial infections on plastids and chloroplasts has been well documented. In particular, bacterial pathogens are known to introduce effectors specifically into chloroplasts, and many viral proteins interact with chloroplast proteins to influence viral replication and movement, and plant defense. By contrast, clear examples are just now emerging for chloroplast-targeted effectors from fungal and oomycete pathogens. In this review, we first present a brief overview of chloroplast contributions to plant defense and then discuss examples of connections between fungal interactions with plants and chloroplast function. We then briefly consider well-characterized bacterial effectors that target chloroplasts as a prelude to discussing the evidence for fungal effectors that impact chloroplast activities.
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Affiliation(s)
- Matthias Kretschmer
- Michael Smith Laboratories, Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (M.K.); (D.D.)
| | - Djihane Damoo
- Michael Smith Laboratories, Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (M.K.); (D.D.)
| | - Armin Djamei
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) OT Gatersleben Corrensstrasse 3, D-06466 Stadt Seeland, Germany;
| | - James Kronstad
- Michael Smith Laboratories, Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (M.K.); (D.D.)
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29
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Hwang I. Plastid biogenesis and homeostasis. PLANT CELL REPORTS 2019; 38:777-778. [PMID: 31165906 DOI: 10.1007/s00299-019-02437-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Affiliation(s)
- Inhwan Hwang
- Division of Integrative Biosciences and Biotechnology and Department of Life Sciences, Pohang University of Science and Technology, Pohang, 37673, South Korea.
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