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Hirano S, Noguchi M, Thagun C, Nishio H, Kodama Y. Levels of photoactivated phototropin modulate signal transmission during the chloroplast accumulation response. PLANT, CELL & ENVIRONMENT 2024; 47:3215-3226. [PMID: 38736289 DOI: 10.1111/pce.14948] [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: 10/19/2023] [Revised: 04/17/2024] [Accepted: 04/30/2024] [Indexed: 05/14/2024]
Abstract
Chloroplasts accumulate in regions of plant cells exposed to irradiation to maximize light reception for efficient photosynthesis. This response is mediated by the blue-light receptor phototropin. Upon the perception of blue light, phototropin is photoactivated, an unknown signal is transmitted from the photoactivated phototropin to distant chloroplasts, and the chloroplasts begin their directional movement. How activated phototropin initiates this signal transmission is unknown. Here, using the liverwort Marchantia polymorpha, we analysed whether increased photoactive phototropin levels mediate signal transmission and chloroplast behaviour during the accumulation response. The signal transmission rate was higher in transgenic cells overexpressing phototropin than in wild-type cells. However, the chloroplast directional movement was similar between wild-type and transgenic cells. Consistent with the observation, increasing the amount of photoactivated phototropin through higher blue-light intensity also accelerated signal transmission but did not affect chloroplast behaviour in wild-type cells. Photoactivation of phototropin under weak blue-light led to the greater protein level of phosphorylated phototropin in cells overexpressing phototropin than in wild-type cells, whereas the autophosphorylation level within each phototropin molecule was similar. These results indicate that the abundance of photoactivated phototropin modulates the signal transmission rate to distant chloroplasts but does not affect chloroplast behaviour during the accumulation response.
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Affiliation(s)
- Satoyuki Hirano
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
| | - Minoru Noguchi
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
| | - Chonprakun Thagun
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Haruki Nishio
- Data Science and AI Innovation Research Promotion Center, Shiga University, Shiga, Japan
- Center for Ecological Research, Kyoto University, Shiga, Japan
| | - Yutaka Kodama
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
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2
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Yong LK, Keino I, Kanna Y, Noguchi M, Fujisawa M, Kodama Y. Functional comparison of phototropin from the liverworts Apopellia endiviifolia and Marchantia polymorpha. Photochem Photobiol 2024; 100:782-792. [PMID: 37882095 DOI: 10.1111/php.13869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 10/03/2023] [Accepted: 10/09/2023] [Indexed: 10/27/2023]
Abstract
Phototropin (phot) is a blue light (BL) receptor and thermosensor that mediates chloroplast movements in plants. Liverworts, as early-diverging plant species, have a single copy of PHOT gene, and the phot protein in each liverwort activates the signaling pathway adapted to its specific growing environment. In this study, we functionally compared phot from two different liverworts species: Apopellia endiviifolia (Aephot) and Marchantia polymorpha (Mpphot). The BL-dependent photochemical activity of Aephot was similar to that of Mpphot, whereas the thermochemical activity of Aephot was lower than that of Mpphot. Therefore, the phot-mediated signaling pathways of the two plant species may differ more in response to temperature than to BL. Furthermore, we analyzed the functional compatibility of Aephot and Mpphot in chloroplast movements by transiently expressing AePHOT or MpPHOT. The transient expression of AePHOT did not mediate chloroplast movement in M. polymorpha, showing the incompatibility of Aephot with the signaling pathway of M. polymorpha. By contrast, the transient expression of MpPHOT mediated chloroplast movement in A. endiviifolia, indicating the compatibility of Mpphot with the signaling pathway of A. endiviifolia. Our findings reveal both functional similarities and differences between Aephot and Mpphot proteins from the closely related liverworts.
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Affiliation(s)
- Lee-Kien Yong
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Issei Keino
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
| | - Yui Kanna
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
| | - Minoru Noguchi
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
| | - Mami Fujisawa
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Yutaka Kodama
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, Japan
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Rehman A, Alwutayd KM, Alshehri D, Alsudays IM, Azeem F, Rahman S, Abid M, Shah AA. Regulatory role of AGC genes in heat stress adaptation in maize ( Zea mays). FUNCTIONAL PLANT BIOLOGY : FPB 2024; 51:FP23282. [PMID: 38758970 DOI: 10.1071/fp23282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 04/19/2024] [Indexed: 05/19/2024]
Abstract
Heat stress represents a significant environmental challenge that restricts maize (Zea mays ) growth and yield on a global scale. Within the plant kingdom, the AGC gene family, encoding a group of protein kinases, has emerged as crucial players in various stress responses. Nevertheless, a comprehensive understanding of AGC genes in Z. mays under heat-stress conditions remains elusive. A genome-wide analysis was done using bioinformatics techniques to identify 39 AGC genes in Z. mays , categorising them into three subfamilies based on their conserved domains. We investigated their phylogenetic relationships, gene structures (including intron-exon configurations), and expression patterns. These genes are likely involved in diverse signalling pathways, fulfilling distinct roles when exposed to heat stress conditions. Notably, most ZmAGC1.5, ZmAGC1.9, ZmNDR3, ZmNDR5 and ZmIRE3 exhibited significant changes in expression levels under heat stress, featuring a high G-box ratio. Furthermore, we pinpointed a subset of AGC genes displaying highly coordinated expression, implying their potential involvement in the heat stress response pathway. Our study offers valuable insights into the contribution of AGC genes to Z. mays 's heat stress response, thus facilitating the development of heat-tolerant Z. mays varieties.
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Affiliation(s)
- Abdul Rehman
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Khairiah Mubarak Alwutayd
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Dikhnah Alshehri
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia
| | | | - Farrukh Azeem
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Shahroz Rahman
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Abid
- Department of Plant Pathology, Bahauddin Zakariya University, Multan, Pakistan
| | - Asad Ali Shah
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
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Koenig AM, Liu B, Hu J. Visualizing the dynamics of plant energy organelles. Biochem Soc Trans 2023; 51:2029-2040. [PMID: 37975429 PMCID: PMC10754284 DOI: 10.1042/bst20221093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/19/2023]
Abstract
Plant organelles predominantly rely on the actin cytoskeleton and the myosin motors for long-distance trafficking, while using microtubules and the kinesin motors mostly for short-range movement. The distribution and motility of organelles in the plant cell are fundamentally important to robust plant growth and defense. Chloroplasts, mitochondria, and peroxisomes are essential organelles in plants that function independently and coordinately during energy metabolism and other key metabolic processes. In response to developmental and environmental stimuli, these energy organelles modulate their metabolism, morphology, abundance, distribution and motility in the cell to meet the need of the plant. Consistent with their metabolic links in processes like photorespiration and fatty acid mobilization is the frequently observed inter-organellar physical interaction, sometimes through organelle membranous protrusions. The development of various organelle-specific fluorescent protein tags has allowed the simultaneous visualization of organelle movement in living plant cells by confocal microscopy. These energy organelles display an array of morphology and movement patterns and redistribute within the cell in response to changes such as varying light conditions, temperature fluctuations, ROS-inducible treatments, and during pollen tube development and immune response, independently or in association with one another. Although there are more reports on the mechanism of chloroplast movement than that of peroxisomes and mitochondria, our knowledge of how and why these three energy organelles move and distribute in the plant cell is still scarce at the functional and mechanistic level. It is critical to identify factors that control organelle motility coupled with plant growth, development, and stress response.
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Affiliation(s)
- Amanda M. Koenig
- Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI, U.S.A
| | - Bo Liu
- Department of Plant Biology, University of California, Davis, CA, U.S.A
| | - Jianping Hu
- Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI, U.S.A
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Xiao Y, Chen M, Zheng N, Xu Z, Zhang J, Hu X, Li L, Gu R, Du X, Wang J. Transcriptome Analysis Identifies Novel Genes Associated with Low-Temperature Seed Germination in Sweet Corn. PLANTS (BASEL, SWITZERLAND) 2022; 12:159. [PMID: 36616288 PMCID: PMC9824086 DOI: 10.3390/plants12010159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 12/21/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Typically, sweet corn, particularly sh2 sweet corn, has low seed vigor owing to its high sugar and low starch content, which is a major problem in sweet corn production, particularly at low temperatures. There is considerable variation in the germination rates among sweet corn varieties under low-temperature conditions, and the underlying mechanisms behind this phenomenon remain unclear. In this study, we screened two inbred sweet corn lines (tolerant line L282 and sensitive line L693) differing in their low-temperature germination rates; while no difference was observed in their germination rates at normal temperatures. To identify the specifically induced genes influencing the germination capacity of sweet corn at low temperatures, a transcriptome analysis of the two lines was conducted at both normal and low temperatures. Compared to the lines at a normal temperature, 3926 and 1404 differently expressed genes (DEGs) were identified from L282 and L693, respectively, under low-temperature conditions. Of them, 830 DEGs were common DEGs (cDEGs) that were identified from both L282 and L693, which were majorly enriched in terms of microtubule-based processes, histone H3-K9 modification, single-organism cellular processes, and carbohydrate metabolic processes. In addition, 3096 special DEGs (sDEGs), with 2199 upregulated and 897 downregulated, were detected in the tolerant line L282, but not in the sensitive line L693. These sDEGs were primarily related to plasma membranes and oxygen-containing compounds. Furthermore, electric conductivity measurements demonstrated that the membrane of L282 experienced less damage, which is consistent with its strong tolerance at low temperatures. These results expand our understanding of the complex mechanisms involved in the cold germination of sweet corn and provide a set of candidate genes for further genetic analysis.
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Affiliation(s)
- Yingni Xiao
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
- Guangdong Provincial Key Laboratory of Crop Genetic Improvement, Crops Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Mei Chen
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Nannan Zheng
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Zhuoyi Xu
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Jie Zhang
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Xinmin Hu
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Li Li
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Riliang Gu
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Xuemei Du
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Jianhua Wang
- Beijing Innovation Center for Crop Seed Technology, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
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Ishikawa K, Konno R, Hirano S, Fujii Y, Fujiwara M, Fukao Y, Kodama Y. The endoplasmic reticulum membrane-bending protein RETICULON facilitates chloroplast relocation movement in Marchantia polymorpha. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2022; 111:205-216. [PMID: 35476214 DOI: 10.1111/tpj.15787] [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: 02/21/2022] [Revised: 04/18/2022] [Accepted: 04/22/2022] [Indexed: 06/14/2023]
Abstract
Plant cells alter the intracellular positions of chloroplasts to ensure efficient photosynthesis, a process controlled by the blue light receptor phototropin. Chloroplasts migrate toward weak light (accumulation response) and move away from excess light (avoidance response). Chloroplasts are encircled by the endoplasmic reticulum (ER), which forms a complex network throughout the cytoplasm. To ensure rapid chloroplast relocation, the ER must alter its structure in conjunction with chloroplast relocation movement, but little is known about the underlying mechanism. Here, we searched for interactors of phototropin in the liverwort Marchantia polymorpha and identified a RETICULON (RTN) family protein; RTN proteins play central roles in ER tubule formation and ER network maintenance by stabilizing the curvature of ER membranes in eukaryotic cells. Marchantia polymorpha RTN1 (MpRTN1) is localized to ER tubules and the rims of ER sheets, which is consistent with the localization of RTNs in other plants and heterotrophs. The Mprtn1 mutant showed an increased ER tubule diameter, pointing to a role for MpRTN1 in ER membrane constriction. Furthermore, Mprtn1 showed a delayed chloroplast avoidance response but a normal chloroplast accumulation response. The live cell imaging of ER dynamics revealed that ER restructuring was impaired in Mprtn1 during the chloroplast avoidance response. These results suggest that during the chloroplast avoidance response, MpRTN1 restructures the ER network and facilitates chloroplast movement via an interaction with phototropin. Our findings provide evidence that plant cells respond to fluctuating environmental conditions by controlling the movements of multiple organelles in a synchronized manner.
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Affiliation(s)
- Kazuya Ishikawa
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Ryota Konno
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Satoyuki Hirano
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Yuta Fujii
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
| | - Masayuki Fujiwara
- Plant Global Education Project, Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
- YANMAR HOLDINGS Co. Ltd., Osaka, Japan
| | - Yoichiro Fukao
- Plant Global Education Project, Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
- Department of Bioinformatics, College of Life Sciences, Ritsumeikan University, Shiga, Japan
| | - Yutaka Kodama
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, Japan
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Noguchi M, Kodama Y. Temperature Sensing in Plants: On the Dawn of Molecular Thermosensor Research. PLANT & CELL PHYSIOLOGY 2022; 63:737-743. [PMID: 35348773 DOI: 10.1093/pcp/pcac033] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 03/05/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
Although many studies on plant growth and development focus on the effects of light, a growing number of studies dissect plant responses to temperature and the underlying signaling pathways. The identity of plant thermosensing molecules (thermosensors) acting upstream of the signaling cascades in temperature responses was elusive until recently. During the past six years, a set of plant thermosensors has been discovered, representing a major turning point in the research on plant temperature responses and signaling. Here, we review these newly discovered plant thermosensors, which can be classified as sensors of warmth or cold. We compare between plant thermosensors and those from other organisms and attempt to define the subcellular thermosensing compartments in plants. In addition, we discuss the notion that photoreceptive thermosensors represent a novel class of thermosensors, the roles of which have yet to be described in non-plant systems.
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Affiliation(s)
- Minoru Noguchi
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, 321-8505 Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, 321-8505 Japan
| | - Yutaka Kodama
- Center for Bioscience Research and Education, Utsunomiya University, Tochigi, 321-8505 Japan
- Graduate School of Regional Development and Creativity, Utsunomiya University, Tochigi, 321-8505 Japan
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