1
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Li J, Zeng J, Tian Z, Zhao Z. Root-specific photoreception directs early root development by HY5-regulated ROS balance. Proc Natl Acad Sci U S A 2024; 121:e2313092121. [PMID: 38300870 PMCID: PMC10861875 DOI: 10.1073/pnas.2313092121] [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: 07/31/2023] [Accepted: 12/01/2023] [Indexed: 02/03/2024] Open
Abstract
Root development is tightly controlled by light, and the response is thought to depend on signal transmission from the shoot. Here, we show that the root apical meristem perceives light independently from aboveground organs to activate the light-regulated transcription factor ELONGATED HYPOCOTYL5 (HY5). The ROS balance between H2O2 and superoxide anion in the root is disturbed under darkness with increased H2O2. We demonstrate that root-derived HY5 directly activates PER6 expression to eliminate H2O2. Moreover, HY5 directly represses UPBEAT1, a known inhibitor of peroxidases, to release the expression of PERs, partially contributing to the light control of ROS balance in the root. Our results reveal an unexpected ability in roots with specific photoreception and provide a mechanistic framework for the HY5-mediated interaction between light and ROS signaling in early root development.
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Affiliation(s)
- Jiaojiao Li
- Division of Life Sciences and Medicine, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, Hefei230027, China
| | - Jian Zeng
- Division of Life Sciences and Medicine, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, Hefei230027, China
| | - Zhaoxia Tian
- Division of Life Sciences and Medicine, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, Hefei230027, China
| | - Zhong Zhao
- Division of Life Sciences and Medicine, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, Hefei230027, China
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2
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Siqueira JA, Zsögön A, Fernie AR, Nunes-Nesi A, Araújo WL. Does day length matter for nutrient responsiveness? TRENDS IN PLANT SCIENCE 2023; 28:1113-1123. [PMID: 37268488 DOI: 10.1016/j.tplants.2023.04.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 04/11/2023] [Accepted: 04/24/2023] [Indexed: 06/04/2023]
Abstract
For over 2500 years, considerable agronomic interest has been paid to soil fertility. Both crop domestication and the Green Revolution shifted photoperiodism and the circadian clock in cultivated species, although this contributed to an increase in the demand for chemical fertilisers. Thus, the uptake of nutrients depends on light signalling, whereas diel growth and circadian rhythms are affected by nutrient levels. Here, we argue that day length and circadian rhythms may be central regulators of the uptake and usage of nutrients, also modulating responses to toxic elements (e.g., aluminium and cadmium). Thus, we suggest that knowledge in this area might assist in developing next-generation crops with improved uptake and use efficiency of nutrients.
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Affiliation(s)
- João Antonio Siqueira
- National Institute of Science and Technology on Plant Physiology under Stress Conditions, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.
| | - Agustin Zsögön
- National Institute of Science and Technology on Plant Physiology under Stress Conditions, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Potsdam-Golm, 14476, Germany
| | - Adriano Nunes-Nesi
- National Institute of Science and Technology on Plant Physiology under Stress Conditions, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Wagner L Araújo
- National Institute of Science and Technology on Plant Physiology under Stress Conditions, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.
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3
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Spaninks K, Offringa R. Local phytochrome signalling limits root growth in light by repressing auxin biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:4642-4653. [PMID: 37140032 PMCID: PMC10433924 DOI: 10.1093/jxb/erad163] [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: 02/03/2023] [Accepted: 05/01/2023] [Indexed: 05/05/2023]
Abstract
In nature, plant shoots are exposed to light whereas the roots grow in relative darkness. Surprisingly, many root studies rely on in vitro systems that leave the roots exposed to light whilst ignoring the possible effects of this light on root development. Here, we investigated how direct root illumination affects root growth and development in Arabidopsis and tomato. Our results show that in light-grown Arabidopsis roots, activation of local phytochrome A and B by far-red or red light inhibits respectively PHYTOCHROME INTERACTING FACTORS 1 or 4, resulting in decreased YUCCA4 and YUCCA6 expression. As a result, auxin levels in the root apex become suboptimal, ultimately resulting in reduced growth of light-grown roots. These findings highlight once more the importance of using in vitro systems where roots are grown in darkness for studies that focus on root system architecture. Moreover, we show that the response and components of this mechanism are conserved in tomato roots, thus indicating its importance for horticulture as well. Our findings open up new research possibilities to investigate the importance of light-induced root growth inhibition for plant development, possibly by exploring putative correlations with responses to other abiotic signals, such as temperature, gravity, touch, or salt stress.
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Affiliation(s)
- Kiki Spaninks
- Plant Developmental Genetics, Institute of Biology Leiden, Leiden University, Sylviusweg 72, 2333 BE, Leiden, Netherlands
| | - Remko Offringa
- Plant Developmental Genetics, Institute of Biology Leiden, Leiden University, Sylviusweg 72, 2333 BE, Leiden, Netherlands
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4
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Housh AB, Noel R, Powell A, Waller S, Wilder SL, Sopko S, Benoit M, Powell G, Schueller MJ, Ferrieri RA. Studies Using Mutant Strains of Azospirillum brasilense Reveal That Atmospheric Nitrogen Fixation and Auxin Production Are Light Dependent Processes. Microorganisms 2023; 11:1727. [PMID: 37512900 PMCID: PMC10383956 DOI: 10.3390/microorganisms11071727] [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: 06/02/2023] [Revised: 06/27/2023] [Accepted: 06/29/2023] [Indexed: 07/30/2023] Open
Abstract
As the use of microbial inoculants in agriculture rises, it becomes important to understand how the environment may influence microbial ability to promote plant growth. This work examines whether there are light dependencies in the biological functions of Azospirillum brasilense, a commercialized prolific grass-root colonizer. Though classically defined as non-phototrophic, A. brasilense possesses photoreceptors that could perceive light conducted through its host's roots. Here, we examined the light dependency of atmospheric biological nitrogen fixation (BNF) and auxin biosynthesis along with supporting processes including ATP biosynthesis, and iron and manganese uptake. Functional mutants of A. brasilense were studied in light and dark environments: HM053 (high BNF and auxin production), ipdC (capable of BNF, deficient in auxin production), and FP10 (capable of auxin production, deficient in BNF). HM053 exhibited the highest rate of nitrogenase activity with the greatest light dependency comparing iterations in light and dark environments. The ipdC mutant showed similar behavior with relatively lower nitrogenase activity observed, while FP10 did not show a light dependency. Auxin biosynthesis showed strong light dependencies in HM053 and FP10 strains, but not for ipdC. Ferrous iron is involved in BNF, and a light dependency was observed for microbial 59Fe2+ uptake in HM053 and ipdC, but not FP10. Surprisingly, a light dependency for 52Mn2+ uptake was only observed in ipdC. Finally, ATP biosynthesis was sensitive to light across all three mutants favoring blue light over red light compared to darkness with observed ATP levels in descending order for HM053 > ipdC > FP10.
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Affiliation(s)
- Alexandra Bauer Housh
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO 65211, USA
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
| | - Randi Noel
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
- Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211, USA
| | - Avery Powell
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
- School of Natural Resources, University of Missouri, Columbia, MO 65211, USA
| | - Spenser Waller
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
- School of Natural Resources, University of Missouri, Columbia, MO 65211, USA
| | - Stacy L Wilder
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
| | - Stephanie Sopko
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
| | - Mary Benoit
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211, USA
| | - Garren Powell
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
| | - Michael J Schueller
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO 65211, USA
| | - Richard A Ferrieri
- Missouri Research Reactor Center, University of Missouri, Columbia, MO 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO 65211, USA
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
- Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211, USA
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5
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Mukherjee A, Dwivedi S, Bhagavatula L, Datta S. Integration of light and ABA signaling pathways to combat drought stress in plants. PLANT CELL REPORTS 2023; 42:829-841. [PMID: 36906730 DOI: 10.1007/s00299-023-02999-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 02/17/2023] [Indexed: 05/06/2023]
Abstract
Drought is one of the most critical stresses, which causes an enormous reduction in crop yield. Plants develop various strategies like drought escape, drought avoidance, and drought tolerance to cope with the reduced availability of water during drought. Plants adopt several morphological and biochemical modifications to fine-tune their water-use efficiency to alleviate drought stress. ABA accumulation and signaling plays a crucial role in the response of plants towards drought. Here, we discuss how drought-induced ABA regulates the modifications in stomatal dynamics, root system architecture, and the timing of senescence to counter drought stress. These physiological responses are also regulated by light, indicating the possibility of convergence of light- and drought-induced ABA signaling pathways. In this review, we provide an overview of investigations reporting light-ABA signaling cross talk in Arabidopsis as well as other crop species. We have also tried to describe the potential role of different light components and their respective photoreceptors and downstream factors like HY5, PIFs, BBXs, and COP1 in modulating drought stress responses. Finally, we highlight the possibilities of enhancing the plant drought resilience by fine-tuning light environment or its signaling components in the future.
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Affiliation(s)
- Arpan Mukherjee
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, India
| | - Shubhi Dwivedi
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, India
| | - Lavanya Bhagavatula
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, India
| | - Sourav Datta
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, India.
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Shi L, Lin K, Su T, Shi F. Abscisic Acid Inhibits Cortical Microtubules Reorganization and Enhances Ultraviolet-B Tolerance in Arabidopsis thaliana. Genes (Basel) 2023; 14:genes14040892. [PMID: 37107650 PMCID: PMC10137628 DOI: 10.3390/genes14040892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 04/29/2023] Open
Abstract
Ultraviolet-B (UV-B) radiation is one of the important environmental factors limiting plant growth. Both abscisic acid (ABA) and microtubules have been previously reported to be involved in plant response to UV-B. However, whether there is a potential link between ABA and microtubules and the consequent signal transduction mechanism underlying plant response to UV-B radiation remains largely unclear. Here, by using sad2-2 mutant plants (sensitive to ABA and drought) and exogenous application of ABA, we saw that ABA strengthens the adaptive response to UV-B stress in Arabidopsis thaliana (A. thaliana). The abnormal swelling root tips of ABA-deficient aba3 mutants demonstrated that ABA deficiency aggravated the growth retardation imposed by UV-B radiation. In addition, the cortical microtubule arrays of the transition zones of the roots were examined in the aba3 and sad2-2 mutants with or without UV-B radiation. The observation revealed that UV-B remodels cortical microtubules, and high endogenous ABA can stabilize the microtubules and reduce their UV-B-induced reorganization. To further confirm the role of ABA on microtubule arrays, root growth and cortical microtubules were evaluated after exogenous ABA, taxol, and oryzalin feeding. The results suggested that ABA can promote root elongation by stabilizing the transverse cortical microtubules under UV-B stress conditions. We thus uncovered an important role of ABA, which bridges UV-B and plants' adaptive response by remodeling the rearrangement of the cortical microtubules.
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Affiliation(s)
- Lichun Shi
- School of Life Science, Liaocheng University, Liaocheng 252059, China
| | - Kun Lin
- School of Life Science, Liaocheng University, Liaocheng 252059, China
| | - Tongbing Su
- National Engineering Research Center for Vegetables, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing 100097, China
| | - Fumei Shi
- School of Life Science, Liaocheng University, Liaocheng 252059, China
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7
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Lyu X, Mu R, Liu B. Shade avoidance syndrome in soybean and ideotype toward shade tolerance. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2023; 43:31. [PMID: 37313527 PMCID: PMC10248688 DOI: 10.1007/s11032-023-01375-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 03/27/2023] [Indexed: 06/15/2023]
Abstract
The shade avoidance syndrome (SAS) in soybean can have destructive effects on yield, as essential carbon resources reserved for yield are diverted to the petiole and stem for exaggerated elongation, resulting in lodging and susceptibility to disease. Despite numerous attempts to reduce the unfavorable impacts of SAS for the development of cultivars suitable for high-density planting or intercropping, the genetic bases and fundamental mechanisms of SAS remain largely unclear. The extensive research conducted in the model plant Arabidopsis provides a framework for understanding the SAS in soybean. Nevertheless, recent investigations suggest that the knowledge obtained from model Arabidopsis may not be applicable to all processes in soybean. Consequently, further efforts are required to identify the genetic regulators of SAS in soybean for molecular breeding of high-yield cultivars suitable for density farming. In this review, we present an overview of the recent developments in SAS studies in soybean and suggest an ideal planting architecture for shade-tolerant soybean intended for high-yield breeding.
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Affiliation(s)
- Xiangguang Lyu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Ruolan Mu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Bin Liu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
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8
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Yun F, Liu H, Deng Y, Hou X, Liao W. The Role of Light-Regulated Auxin Signaling in Root Development. Int J Mol Sci 2023; 24:ijms24065253. [PMID: 36982350 PMCID: PMC10049345 DOI: 10.3390/ijms24065253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/05/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
The root is an important organ for obtaining nutrients and absorbing water and carbohydrates, and it depends on various endogenous and external environmental stimulations such as light, temperature, water, plant hormones, and metabolic constituents. Auxin, as an essential plant hormone, can mediate rooting under different light treatments. Therefore, this review focuses on summarizing the functions and mechanisms of light-regulated auxin signaling in root development. Some light-response components such as phytochromes (PHYs), cryptochromes (CRYs), phototropins (PHOTs), phytochrome-interacting factors (PIFs) and constitutive photo-morphorgenic 1 (COP1) regulate root development. Moreover, light mediates the primary root, lateral root, adventitious root, root hair, rhizoid, and seminal and crown root development via the auxin signaling transduction pathway. Additionally, the effect of light through the auxin signal on root negative phototropism, gravitropism, root greening and the root branching of plants is also illustrated. The review also summarizes diverse light target genes in response to auxin signaling during rooting. We conclude that the mechanism of light-mediated root development via auxin signaling is complex, and it mainly concerns in the differences in plant species, such as barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.), changes of transcript levels and endogenous IAA content. Hence, the effect of light-involved auxin signaling on root growth and development is definitely a hot issue to explore in the horticultural studies now and in the future.
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de Paula BV, Sete PB, Berghetti ÁLP, da Silva LOS, Jung JP, Nicoloso FT, Mayer NA, Kulmann MS, Brunetto G. Kinetic parameters related to nitrogen uptake in 'Okinawa' peach rootstocks are altered by 'Chimarrita' scion Nitrogen uptake in 'Okinawa' peach rootstock. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:917-923. [PMID: 36067353 DOI: 10.1002/jsfa.12203] [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: 12/14/2021] [Revised: 07/06/2022] [Accepted: 09/06/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND The kinetic parameters of peach rootstock are a major factor contributing to its nitrogen (N) uptake efficiency, which directly affects the yield and quality parameters. However, the impact of grafting on N kinetic parameters is not sufficiently known as rootstocks are grafted with other scion cultivars before being transplanted to the field. The objective of this study was therefore to evaluate whether the grafting of 'Okinawa' rootstock with the scion cultivar 'Chimarrita' can alter the kinetic parameters related to N uptake. RESULTS The plants were acclimatized in Hoagland solution for 21 days and, sequentially, were tested to assess the depletion of the internal reserves at 15 and 30 days in CaSO4 solution. Morphological and physiological parameters were evaluated, and kinetic parameters were calculated. The depletion period for to reach the minimum concentration (Cmin ) of NO3 - and NH4 + in the plant was 62 h and 56 h, respectively. The optimal time for internal reserve depletion for 'Okinawa' rootstock with and without the 'Chimarrita' scion was 30 days. CONCLUSION 'Okinawa' rootstock grafted with 'Chimarrita' scion cultivar was more efficient in NO3 - and NH4 + uptake. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Betania Vahl de Paula
- Department of Soil Science, Center of Rural Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Paula Beatriz Sete
- Department of Rural Engineering, Center of Agricultural Sciences, Federal University of Santa Catarina, Florianópolis, Brazil
| | | | | | - João Pedro Jung
- Department of Soil Science, Center of Rural Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Fernando Teixeira Nicoloso
- Department of Soil Science, Center of Rural Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Newton Alex Mayer
- Temperate Climate Center, Embrapa, 392 Highway - km 78, 9° District, Pelotas, Brazil
| | - Matheus Severo Kulmann
- Department of Soil Science, Center of Rural Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Gustavo Brunetto
- Department of Soil Science, Center of Rural Science, Federal University of Santa Maria, Santa Maria, Brazil
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Liang A, Yu K, Min X, Li J, Li J, Zuo X, Yao Y. The Explanation of Photopic Luminous Efficiency Curve by Using Both of the Cones' Optical Fiber Coupling Effects and the Absorption of L Cones. SENSORS (BASEL, SWITZERLAND) 2023; 23:1523. [PMID: 36772563 PMCID: PMC9921457 DOI: 10.3390/s23031523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 06/18/2023]
Abstract
In this paper, we build four-part cone models to explore the coupling effect of seven cone fiber couplers. Moreover, this is the first study of the coupling effect of four layers of biological couplers in animals and other biological lives. We simulate the four layers cone couplers by using the beam propagation method, and we assume the input beam is located at the outer fiber of the central cone. Our simulation results showed that there are two wavelength regions (short and long wavelength regions) with the strongest coupling, where the most power of input optical powers of the central cones will transfer to the six surrounding cones after transmitting through the four layers of cone couplers. However, within a wavelength region of ±75 nm near to the peak wavelengths, located in the yellow-green wavelength range, the splitting ratios at the output of the outer segment of the central cone are always greater than the sum of the splitting ratios of the six surrounding cones. These cone couplers may play an important role in color preprocessing (e.g., doing opponent color processing partially). The cone fiber coupler effect and light absorption of cones are considered separately in our models. By taking account of both the cone fiber coupling effect and absorption of outer segment of L cone, we find the multiplication of the relative optical power of cone couplers, the spectral sensitivity data of the L cone, and a normalized coefficient that matches with the photopic luminous efficiency of the human eye well. This is the attempt to use both the cone fiber coupling effect and the absorption of L cones to explain the photopic luminous efficiency. The splitting ratios of the central cones are greater than 80% at peak wavelengths located in the yellow-green wavelength range, and this can help to explain why the human eye is more sensitive to green light.
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11
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Scion-to-Rootstock Mobile Transcription Factor CmHY5 Positively Modulates the Nitrate Uptake Capacity of Melon Scion Grafted on Squash Rootstock. Int J Mol Sci 2022; 24:ijms24010162. [PMID: 36613606 PMCID: PMC9820822 DOI: 10.3390/ijms24010162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/18/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022] Open
Abstract
It is generally recognized that the root uptake capacity of grafted plants strongly depends on the rootstocks' well-developed root system. However, we found that grafted plants showed different nitrate uptake capacities when different varieties of oriental melon scion were grafted onto the same squash rootstock, suggesting that the scion regulated the nitrate uptake capacity of the rootstock root. In this study, we estimated the nitrate uptake capacity of grafted plants with the different oriental melon varieties' seedlings grafted onto the same squash rootstocks. The results indicated a significant difference in the nitrate uptake rate and activity of two heterologous grafting plants. We also showed a significant difference in CmoNRT2.1 expression in the roots of two grafting combinations and verified the positive regulation of nitrate uptake by CmoNRT2.1 expression. In addition, the two varieties of oriental melon scion had highly significant differences in CmHY5 expression, which was transported to the rootstock and positively induced CmoHY5-1 and CmoHY5-2 expression in the rootstock roots. Meanwhile, CmHY5 could positively regulate CmoNRT2.1 expression in the rootstock roots. Furthermore, CmoHY5-1 and CmoHY5-2 also positively regulated CmoNRT2.1 expression, respectively, and CmoHY5-1 dominated the positive regulation of CmoNRT2.1, while CmHY5 could interact with CmoHY5-1 and CmoHY5-2, respectively, to jointly regulate CmoNRT2.1 expression. The oriental melon scion regulated the nitrate uptake capacity of the melon/squash grafting plant roots, and the higher expression of CmHY5 in the oriental melon scion leaves, the more substantial the nitrate uptake capacity of squash rootstock roots.
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12
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Stafen CF, Kleine-Vehn J, Maraschin FDS. Signaling events for photomorphogenic root development. TRENDS IN PLANT SCIENCE 2022; 27:1266-1282. [PMID: 36057533 DOI: 10.1016/j.tplants.2022.08.002] [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: 09/28/2021] [Revised: 07/26/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
A germinating seedling incorporates environmental signals such as light into developmental outputs. Light is not only a source of energy, but also a central coordinative signal in plants. Traditionally, most research focuses on aboveground organs' response to light; therefore, our understanding of photomorphogenesis in roots is relatively scarce. However, root development underground is highly responsive to light signals from the shoot and understanding these signaling mechanisms will give a better insight into early seedling development. Here, we review the central light signaling hubs and their role in root growth promotion of Arabidopsis thaliana seedlings.
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Affiliation(s)
- Cássia Fernanda Stafen
- PPGBM - Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Jürgen Kleine-Vehn
- Institute of Biology II, Chair of Molecular Plant Physiology (MoPP), University of Freiburg, Freiburg, Germany; Center for Integrative Biological Signalling Studies (CIBSS), University of Freiburg, 79104 Freiburg, Germany
| | - Felipe Dos Santos Maraschin
- PPGBM - Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil; Departamento de Botânica, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil.
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13
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Borniego MB, Costigliolo-Rojas C, Casal JJ. Shoot thermosensors do not fulfil the same function in the root. THE NEW PHYTOLOGIST 2022; 236:9-14. [PMID: 35730992 DOI: 10.1111/nph.18332] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 06/11/2022] [Indexed: 05/12/2023]
Affiliation(s)
- María Belén Borniego
- Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA), Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C1417DSE, Buenos Aires, Argentina
| | - Cecilia Costigliolo-Rojas
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, CONICET, C1405BWE, Buenos Aires, Argentina
| | - Jorge J Casal
- Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA), Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C1417DSE, Buenos Aires, Argentina
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, CONICET, C1405BWE, Buenos Aires, Argentina
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14
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Estrella-Maldonado H, Chan-León A, Fuentes G, Girón-Ramírez A, Desjardins Y, Santamaría JM. The interaction between exogenous IBA with sucrose, light and ventilation alters the expression of ARFs and Aux/IAA genes in Carica papaya plantlets. PLANT MOLECULAR BIOLOGY 2022; 110:107-130. [PMID: 35725838 DOI: 10.1007/s11103-022-01289-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
The interaction between exogenous IBA with sucrose, light and ventilation, alters the expression of ARFs and Aux/IAA genes in in vitro grown Carica papaya plantlets. In vitro papaya plantlets normally show low rooting percentages during their ex vitro establishment that eventually leads to high mortality when transferred to field conditions. Indole-3-butyric acid (IBA) auxin is normally added to culture medium, to achieve adventitious root formation on in vitro papaya plantlets. However, the molecular mechanisms occurring when IBA is added to the medium under varying external conditions of sugar, light and ventilation have not been studied. Auxin response factors (ARF) are auxin-transcription activators, while auxin/indole-3-acetic acid (Aux/IAA) are auxin-transcription repressors, that modulate key components involved in auxin signaling in plants. In the present study, we identified 12 CpARF and 18 CpAux/IAA sequences in the papaya genome. The cis-acting regulatory elements associated to those CpARFs and CpAux/IAA gene families were associated with stress and hormone responses. Furthermore, a comprehensive characterization and expression profiling analysis was performed on 6 genes involved in rhizogenesis formation (CpARF5, 6, 7 and CpAux/IAA11, 13, 14) from in vitro papaya plantlets exposed to different rhizogenesis-inducing treatments. In general, intact in vitro plantlets were not able to produce adventitious roots, when IBA (2 mg L-1) was added to the culture medium; they became capable to produce roots and increased their ex-vitro survival. However, the best rooting and survival % were obtained when IBA was added in combination with adequate sucrose supply (20 g L-1), increased light intensity (750 µmol photon m-2 s-1) and ventilation systems within the culture vessel. Interestingly, it was precisely under those conditions that promoted high rooting and survival %, where the highest expression of CpARFs, but the lowest expression of CpAux/IAAs occurred. One interesting case occurred when in vitro plantlets were exposed to high levels of light in the absence of added IBA, as high rooting and survival occurred, even though no exogenous auxin was added. In fact, plantlets from this treatment showed the right expression profile between auxin activators/repressors genes, in both stem base and root tissues.
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Affiliation(s)
- Humberto Estrella-Maldonado
- Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97205, Mérida, Yucatán, México.
- Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Campo Experimental Ixtacuaco, Km 4.5 Carretera Martínez de la Torre-Tlapacoyan, C.P. 93600, Tlapacoyan, Veracruz, México.
| | - Arianna Chan-León
- Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97205, Mérida, Yucatán, México
| | - Gabriela Fuentes
- Independent Researcher, Calle 6a 279 a, Jardines de Vista Alegre, Mérida, Yucatán, México
| | - Amaranta Girón-Ramírez
- Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97205, Mérida, Yucatán, México
| | - Yves Desjardins
- Institute of Nutrition and Functional Foods (INAF), Laval University, 2440 Boulevard Hochelaga, Quebec City, QC, G1V 0A6, Canada
| | - Jorge M Santamaría
- Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97205, Mérida, Yucatán, México.
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15
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Nayak JJ, Anwar S, Krishna P, Chen ZH, Plett JM, Foo E, Cazzonelli CI. Tangerine tomato roots show increased accumulation of acyclic carotenoids, less abscisic acid, drought sensitivity, and impaired endomycorrhizal colonization. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 321:111308. [PMID: 35696908 DOI: 10.1016/j.plantsci.2022.111308] [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: 02/01/2022] [Revised: 04/13/2022] [Accepted: 04/29/2022] [Indexed: 06/15/2023]
Abstract
The Heirloom Golden tangerine tomato fruit variety is highly nutritious due to accumulation of tetra-cis-lycopene, that has a higher bioavailability and recognised health benefits in treating anti-inflammatory diseases compared to all-trans-lycopene isomers found in red tomatoes. We investigated if photoisomerization of tetra-cis-lycopene occurs in roots of the MicroTom tangerine (tangmic) tomato and how this affects root to shoot biomass, mycorrhizal colonization, abscisic acid accumulation, and responses to drought. tangmic plants grown in soil under glasshouse conditions displayed a reduction in height, number of flowers, fruit yield, and root length compared to wild-type (WT). Soil inoculation with Rhizophagus irregularis revealed fewer arbuscules and other fungal structures in the endodermal cells of roots in tangmic relative to WT. The roots of tangmic hyperaccumulated acyclic cis-carotenes, while only trace levels of xanthophylls and abscisic acid were detected. In response to a water deficit, leaves from the tangmic plants displayed a rapid decline in maximum quantum yield of photosystem II compared to WT, indicating a defective root to shoot signalling response to drought. The lack of xanthophylls biosynthesis in tangmic roots reduced abscisic acid levels, thereby likely impairing endomycorrhizal colonisation and drought-induced root to shoot signalling.
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Affiliation(s)
- Jwalit J Nayak
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Sidra Anwar
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Priti Krishna
- School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Zhong-Hua Chen
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia; School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Jonathan M Plett
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Eloise Foo
- School of Natural Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia
| | - Christopher I Cazzonelli
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia.
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16
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Park YJ, Kim JY, Park CM. SMAX1 potentiates phytochrome B-mediated hypocotyl thermomorphogenesis. THE PLANT CELL 2022; 34:2671-2687. [PMID: 35478037 PMCID: PMC9252492 DOI: 10.1093/plcell/koac124] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 03/16/2022] [Indexed: 05/19/2023]
Abstract
Plant thermosensors help optimize plant development and architecture for ambient temperatures, and morphogenic adaptation to warm temperatures has been extensively studied in recent years. Phytochrome B (phyB)-mediated thermosensing and the gene regulatory networks governing thermomorphogenic responses are well understood at the molecular level. However, it is unknown how plants manage their responsiveness to fluctuating temperatures in inducing thermomorphogenic behaviors. Here, we demonstrate that SUPPRESSOR OF MAX2 1 (SMAX1), known as a karrikin signaling repressor, enhances the thermosensitivity of hypocotyl morphogenesis in Arabidopsis thaliana. Hypocotyl thermomorphogenesis was largely disrupted in SMAX1-deficient mutants. SMAX1 interacts with phyB to alleviate its suppressive effects on the transcription factor activity of PHYTOCHROME-INTERACTING FACTOR 4 (PIF4), promoting hypocotyl thermomorphogenesis. Interestingly, the SMAX1 protein is slowly destabilized at warm temperatures, preventing hypocotyl overgrowth. Our findings indicate that the thermodynamic control of SMAX1 abundance serves as a molecular gatekeeper for phyB function in thermosensitizing PIF4-mediated hypocotyl morphogenesis.
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Affiliation(s)
- Young-Joon Park
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
| | - Jae Young Kim
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
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17
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Naumann C, Heisters M, Brandt W, Janitza P, Alfs C, Tang N, Toto Nienguesso A, Ziegler J, Imre R, Mechtler K, Dagdas Y, Hoehenwarter W, Sawers G, Quint M, Abel S. Bacterial-type ferroxidase tunes iron-dependent phosphate sensing during Arabidopsis root development. Curr Biol 2022; 32:2189-2205.e6. [PMID: 35472311 PMCID: PMC9168544 DOI: 10.1016/j.cub.2022.04.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 02/21/2022] [Accepted: 04/04/2022] [Indexed: 12/02/2022]
Abstract
Access to inorganic phosphate (Pi), a principal intermediate of energy and nucleotide metabolism, profoundly affects cellular activities and plant performance. In most soils, antagonistic Pi-metal interactions restrict Pi bioavailability, which guides local root development to maximize Pi interception. Growing root tips scout the essential but immobile mineral nutrient; however, the mechanisms monitoring external Pi status are unknown. Here, we show that Arabidopsis LOW PHOSPHATE ROOT 1 (LPR1), one key determinant of Fe-dependent Pi sensing in root meristems, encodes a novel ferroxidase of high substrate specificity and affinity (apparent KM ∼ 2 μM Fe2+). LPR1 typifies an ancient, Fe-oxidizing multicopper protein family that evolved early upon bacterial land colonization. The ancestor of streptophyte algae and embryophytes (land plants) acquired LPR1-type ferroxidase from soil bacteria via horizontal gene transfer, a hypothesis supported by phylogenomics, homology modeling, and biochemistry. Our molecular and kinetic data on LPR1 regulation indicate that Pi-dependent Fe substrate availability determines LPR1 activity and function. Guided by the metabolic lifestyle of extant sister bacterial genera, we propose that Arabidopsis LPR1 monitors subtle concentration differentials of external Fe availability as a Pi-dependent cue to adjust root meristem maintenance via Fe redox signaling and cell wall modification. We further hypothesize that the acquisition of bacterial LPR1-type ferroxidase by embryophyte progenitors facilitated the evolution of local Pi sensing and acquisition during plant terrestrialization. Arabidopsis thaliana LPR1 multicopper oxidase typifies a novel ferroxidase cohort Fe availability tunes LPR1-dependent root responses to phosphate (Pi) limitation LPR1 specificity links Fe-Pi interactions to root Pi sensing via redox cycling Streptophyte ancestors acquired LPR1-type ferroxidase from soil bacteria by HGT
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18
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Lee JH, Park YJ, Kim JY, Park CM. Phytochrome B Conveys Low Ambient Temperature Cues to the Ethylene-Mediated Leaf Senescence in Arabidopsis. PLANT & CELL PHYSIOLOGY 2022; 63:326-339. [PMID: 34950951 DOI: 10.1093/pcp/pcab178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/18/2021] [Accepted: 12/23/2021] [Indexed: 05/22/2023]
Abstract
Leaf senescence is an active developmental process that is tightly regulated through extensive transcriptional and metabolic reprogramming events, which underlie controlled degradation and relocation of nutrients from aged or metabolically inactive leaves to young organs. The onset of leaf senescence is coordinately modulated by intrinsic aging programs and environmental conditions, such as prolonged darkness and temperature extremes. Seedlings growing under light deprivation, as often experienced in severe shading or night darkening, exhibit an accelerated senescing process, which is mediated by a complex signaling network that includes sugar starvation responses and light signaling events via the phytochrome B (phyB)-PHYTOCHROME-INTERACTING FACTOR (PIF) signaling routes. Notably, recent studies indicate that nonstressful ambient temperatures profoundly influence the onset and progression of leaf senescence in darkness, presumably mediated by the phyB-PIF4 signaling pathways. However, it is not fully understood how temperature signals regulate leaf senescence at the molecular level. Here, we demonstrated that low ambient temperatures repress the nuclear export of phyB and the nuclear phyB suppresses the transcriptional activation activity of ethylene signaling mediator ETHYLENE INSENSITIVE3 (EIN3), thus delaying leaf senescence. Accordingly, leaf senescence was insensitive to low ambient temperatures in transgenic plants overexpressing a constitutively nuclear phyB form, as observed in ein3 eil1 mutants. In contrast, leaf senescence was significantly promoted in phyB-deficient mutants under identical temperature conditions. Our data indicate that phyB coordinately integrates light and temperature cues into the EIN3-mediated ethylene signaling pathway that regulates leaf senescence under light deprivation, which would enhance plant fitness under fluctuating natural environments.
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Affiliation(s)
- June-Hee Lee
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
| | - Young-Joon Park
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
| | - Jae Young Kim
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
| | - Chung-Mo Park
- Department of Chemistry, Seoul National University, Seoul 08826, Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul 08826, Korea
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19
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Ji H, Xiao R, Lyu X, Chen J, Zhang X, Wang Z, Deng Z, Wang Y, Wang H, Li R, Chai Q, Hao Y, Xu Q, Liao J, Wang Q, Liu Y, Tang R, Liu B, Li X. Differential light-dependent regulation of soybean nodulation by papilionoid-specific HY5 homologs. Curr Biol 2022; 32:783-795.e5. [PMID: 35081330 DOI: 10.1016/j.cub.2021.12.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 11/15/2021] [Accepted: 12/16/2021] [Indexed: 11/30/2022]
Abstract
Legumes have evolved photosynthesis and symbiotic nitrogen fixation for the acquisition of energy and nitrogen nutrients. During the transition from heterotrophic to autotrophic growth, blue light primarily triggers photosynthesis and low soil nitrogen induces symbiotic nodulation. Whether and how darkness and blue light influence root symbiotic nodulation during this transition is unknown. Here, we show that short-term darkness promotes nodulation and that blue light inhibits nodulation through two soybean TGACG-motif-binding factors (STF1 and STF2), which are Papilionoideae-specific transcription factors and divergent orthologs of Arabidopsis ELONGATED HYPOCOTYL 5 (HY5). STF1 and STF2 negatively regulate soybean nodulation by repressing the transcription of nodule inception a (GmNINa), which is a central regulator of nodulation, in response to darkness and blue light. STF1 and STF2 are not capable of moving from the shoots to roots, and they act both locally and systemically to mediate darkness- and blue-light-regulated nodulation. We further show that cryptochromes GmCRY1s are required for nodulation in the dark and partially contribute to the blue light inhibition of nodulation. In addition, root GmCRY1s mediate blue-light-induced transcription of STF1 and STF2, and intriguingly, GmCRY1b can interact with STF1 and STF2 to stabilize the protein stability of STF1 and STF2. Our results establish that the blue light receptor GmCRY1s-STF1/2 module plays a pivotal role in integrating darkness/blue light and nodulation signals. Furthermore, our findings reveal a molecular basis by which photosensory pathways modulate nodulation and autotrophic growth through an intricate interplay facilitating seedling establishment in response to low nitrogen and light signals.
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Affiliation(s)
- Hongtao Ji
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
| | - Renhao Xiao
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiangguang Lyu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jiahuan Chen
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xuehai Zhang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhijuan Wang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhiping Deng
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China
| | - Yongliang Wang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hui Wang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ran Li
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Qingqing Chai
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yongfang Hao
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Qi Xu
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Junwen Liao
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Qian Wang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yu Liu
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ruizhen Tang
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Bin Liu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Xia Li
- National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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20
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Ge S, He L, Jin L, Xia X, Li L, Ahammed GJ, Qi Z, Yu J, Zhou Y. Light-dependent activation of HY5 promotes mycorrhizal symbiosis in tomato by systemically regulating strigolactone biosynthesis. THE NEW PHYTOLOGIST 2022; 233:1900-1914. [PMID: 34839530 DOI: 10.1111/nph.17883] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 11/18/2021] [Indexed: 05/25/2023]
Abstract
Light quality affects mutualisms between plant roots and arbuscular mycorrhizal fungi (AMFs), which modify nutrient acquisition in plants. However, the mechanisms by which light systemically modulates root colonization by AMFs and phosphate uptake in roots remain unclear. We used a range of approaches, including grafting techniques, protein immunoblot analysis, electrophoretic mobility shift assay, chromatin immunoprecipitation, and dual-luciferase assays, to unveil the molecular basis of light signal transmission from shoot to root that mediates arbuscule development and phosphate uptake in tomato. The results show that shoot phytochrome B (phyB) triggers shoot-derived mobile ELONGATED HYPOCOTYL5 (HY5) protein accumulation in roots, and HY5 further positively regulates transcription of strigolactone (SL) synthetic genes, thus forming a shoot phyB-dependent systemic signaling pathway that regulates the synthesis and accumulation of SLs in roots. Further experiments with carotenoid cleavage dioxygenase 7 mutants and supplementary red light confirm that SLs are indispensable in the red-light-regulated mycorrhizal symbiosis in roots. Our results reveal a phyB-HY5-SLs systemic signaling cascade that facilitates mycorrhizal symbiosis and phosphate utilization in plants. The findings provide new prospects for the potential application of AMFs and light manipulation to effectively improve nutrient utilization and minimize the use of chemical fertilizers and associated pollution.
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Affiliation(s)
- Shibei Ge
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Liqun He
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Lijuan Jin
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Xiaojian Xia
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
- Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Yuhangtang Road 866, Hangzhou, 310058, China
| | - Lan Li
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Golam Jalal Ahammed
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, Henan, 471023, China
| | - Zhenyu Qi
- Agricultural Experiment Station, Zhejiang University, Hangzhou, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Jingquan Yu
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
- Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Yuhangtang Road 866, Hangzhou, 310058, China
| | - Yanhong Zhou
- Department of Horticulture, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou, 310058, China
- Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Yuhangtang Road 866, Hangzhou, 310058, China
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21
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Xiao Y, Chu L, Zhang Y, Bian Y, Xiao J, Xu D. HY5: A Pivotal Regulator of Light-Dependent Development in Higher Plants. FRONTIERS IN PLANT SCIENCE 2022; 12:800989. [PMID: 35111179 PMCID: PMC8801436 DOI: 10.3389/fpls.2021.800989] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Accepted: 12/17/2021] [Indexed: 05/10/2023]
Abstract
ELONGATED HYPOCOTYL5 (HY5), a bZIP-type transcription factor, acts as a master regulator that regulates various physiological and biological processes in plants such as photomorphogenesis, root growth, flavonoid biosynthesis and accumulation, nutrient acquisition, and response to abiotic stresses. HY5 is evolutionally conserved in function among various plant species. HY5 acts as a master regulator of light-mediated transcriptional regulatory hub that directly or indirectly controls the transcription of approximately one-third of genes at the whole genome level. The transcription, protein abundance, and activity of HY5 are tightly modulated by a variety of factors through distinct regulatory mechanisms. This review primarily summarizes recent advances on HY5-mediated molecular and physiological processes and regulatory mechanisms on HY5 in the model plant Arabidopsis as well as in crops.
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Affiliation(s)
| | | | | | | | | | - Dongqing Xu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, College of Agriculture, Nanjing Agricultural University, Nanjing, China
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22
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Sineshchekov V, Shor E, Koppel L. The phosphatase/kinase balance affects phytochrome A and its native pools, phyA' and phyA″, in etiolated maize roots: evidence from the induction of phyA' destruction by a protein phosphatase inhibitor sodium fluoride. Photochem Photobiol Sci 2021; 20:1429-1437. [PMID: 34586621 DOI: 10.1007/s43630-021-00110-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 09/20/2021] [Indexed: 11/25/2022]
Abstract
Phytochrome A (phyA) comprises two native types, phyA' and phyA″, with distinct spectroscopic, photochemical, and functional properties, differing at the N-terminal extension, probably, by the state of phosphorylation. To find out if and how protein phosphatases (PP) affect the state of the phyA species in planta, we studied the effect of the non-specific phosphatase inhibitor NaF on etiolated maize seedlings with the use of low-temperature fluorescence spectroscopy and photochemistry. In roots, phosphatase inhibition facilitated photoreceptor destruction in its labile phyA' form and shifted the phyA'/phyA″ ratio towards the more stable phyA″. The effect of NaF was not observed in stems. It was similar, though less pronounced, in comparison to the effects of the serine/threonine PP inhibitors, okadaic and cantharidic acids (OA and CA), which likewise facilitate the destruction of phyA' in etiolated maize stems, not, however, in roots (Sineshchekov et al., Photochem. Photobiol 89:83-96, 2013). The phyA'/phyA″ balance thus depends on the kinase/phosphatase equilibrium in the root cells. The relatively low effect of NaF on phyA in roots, together with the lack of the effect of OA and CA in them, may imply that the mechanism controlling the phyA'/phyA″ balance in roots can be different from that in shoots.
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Affiliation(s)
- Vitaly Sineshchekov
- Biology Department, MV Lomonosov Moscow State University, Moscow, 119899, Russia.
| | - Ekaterina Shor
- Biology Department, MV Lomonosov Moscow State University, Moscow, 119899, Russia
- Faculty of Agriculture, Hebrew University, Rehovot, Israel
| | - Larissa Koppel
- Biology Department, MV Lomonosov Moscow State University, Moscow, 119899, Russia
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23
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Gao YQ, Bu LH, Han ML, Wang YL, Li ZY, Liu HT, Chao DY. Long-distance blue light signalling regulates phosphate deficiency-induced primary root growth inhibition. MOLECULAR PLANT 2021; 14:1539-1553. [PMID: 34102336 DOI: 10.1016/j.molp.2021.06.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/21/2021] [Accepted: 06/03/2021] [Indexed: 05/25/2023]
Abstract
Although roots are mainly embedded in the soil, recent studies revealed that light regulates mineral nutrient uptake by roots. However, it remains unclear whether the change in root system architecture in response to different rhizosphere nutrient statuses involves light signaling. Here, we report that blue light regulates primary root growth inhibition under phosphate-deficient conditions through the cryptochromes and their downstream signaling factors. We showed that the inhibition of root elongation by low phosphate requires blue light signal perception at the shoot and transduction to the root. In this process, SPA1 and COP1 play a negative role while HY5 plays a positive role. Further experiments revealed that HY5 is able to migrate from the shoot to root and that the shoot-derived HY5 autoactivates root HY5 and regulates primary root growth by directly activating the expression of LPR1, a suppressor of root growth under phosphate starvation. Taken together, our study reveals a regulatory mechanism by which blue light signaling regulates phosphate deficiency-induced primary root growth inhibition, providing new insights into the crosstalk between light and nutrient signaling.
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Affiliation(s)
- Yi-Qun Gao
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Ling-Hua Bu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Mei-Ling Han
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Ya-Ling Wang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Zong-Yun Li
- School of Life Sciences, Jiangsu Normal University, Xuzhou 221116, China
| | - Hong-Tao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Dai-Yin Chao
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China.
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24
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Hou S, Wolinska KW, Hacquard S. Microbiota-root-shoot-environment axis and stress tolerance in plants. CURRENT OPINION IN PLANT BIOLOGY 2021; 62:102028. [PMID: 33713892 DOI: 10.1016/j.pbi.2021.102028] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/29/2021] [Accepted: 02/02/2021] [Indexed: 05/19/2023]
Abstract
Reminiscent to the microbiota-gut-brain axis described in animals, recent advances indicate that plants can take advantage of belowground microbial commensals to orchestrate aboveground stress responses. Integration of plant responses to microbial cues belowground and environmental cues aboveground emerges as a mechanism that promotes stress tolerance in plants. Using recent examples obtained from reductionist and community-level approaches, we discuss the extent to which perception of aboveground biotic and abiotic stresses can cascade along the shoot-root axis to sculpt root microbiota assembly and modulate the growth of root commensals that bolster aboveground stress tolerance. We propose that host modulation of microbiota-root-shoot circuits contributes to phenotypic plasticity and decision-making in plants, thereby promoting adaptation to rapidly changing environmental conditions.
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Affiliation(s)
- Shiji Hou
- Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | | | - Stéphane Hacquard
- Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany; Cluster of Excellence on Plant Sciences (CEPLAS), Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany.
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25
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Wang L, Zhou A, Li J, Yang M, Bu F, Ge L, Chen L, Huang W. Circadian rhythms driving a fast-paced root clock implicate species-specific regulation in Medicago truncatula. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2021; 63:1537-1554. [PMID: 34009694 DOI: 10.1111/jipb.13138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 05/13/2021] [Indexed: 06/12/2023]
Abstract
Plants have a hierarchical circadian structure comprising multiple tissue-specific oscillators that operate at different speeds and regulate the expression of distinct sets of genes in different organs. However, the identity of the genes differentially regulated by the circadian clock in different organs, such as roots, and how their oscillations create functional specialization remain unclear. Here, we profiled the diurnal and circadian landscapes of the shoots and roots of Medicago truncatula and identified the conserved regulatory sequences contributing to transcriptome oscillations in each organ. We found that the light-dark cycles strongly affect the global transcriptome oscillation in roots, and many clock genes oscillate only in shoots. Moreover, many key genes involved in nitrogen fixation are regulated by circadian rhythms. Surprisingly, the root clock runs faster than the shoot clock, which is contrary to the hierarchical circadian structure showing a slow-paced root clock in both detached and intact Arabidopsis thaliana (L.) Heynh. roots. Our result provides important clues about the species-specific circadian regulatory mechanism, which is often overlooked, and possibly coordinates the timing between shoots and roots independent of the current prevailing model.
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Affiliation(s)
- Liping Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Anqi Zhou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Jing Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Mingkang Yang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Fan Bu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Liangfa Ge
- Department of Grassland Science, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Engineering Research Center for Grassland Science, Guangzhou, 510642, China
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, South China Agricultural University, Guangzhou, 510642, China
| | - Liang Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Wei Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China
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26
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Kim JY, Lee JH, Park CM. A Multifaceted Action of Phytochrome B in Plant Environmental Adaptation. FRONTIERS IN PLANT SCIENCE 2021; 12:659712. [PMID: 34239522 PMCID: PMC8258378 DOI: 10.3389/fpls.2021.659712] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/25/2021] [Indexed: 06/13/2023]
Abstract
Light acts as a vital external cue that conveys surrounding information into plant growth and performance to facilitate plants to coordinate with changing environmental conditions. Upon exposure to light illumination, plants trigger a burst of molecular and physiological signaling cascades that induces not only photomorphogenic responses but also diverse adaptive behaviors. Notably, light responses and photomorphogenic traits are often associated with plant responses to other environmental cues, such as heat, cold, drought, and herbivore and pathogen attack. Growing evidence in recent years demonstrate that the red/far-red light-absorbing phytochrome (phy) photoreceptors, in particular phyB, play an essential role in plant adaptation responses to abiotic and biotic tensions by serving as a key mediator of information flow. It is also remarkable that phyB mediates the plant priming responses to numerous environmental challenges. In this minireview, we highlight recent advances on the multifaceted role of phyB during plant environmental adaptation. We also discuss the biological relevance and efficiency of the phy-mediated adaptive behaviors in potentially reducing fitness costs under unfavorable environments.
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Affiliation(s)
- Jae Young Kim
- Department of Chemistry, Seoul National University, Seoul, South Korea
| | - June-Hee Lee
- Department of Chemistry, Seoul National University, Seoul, South Korea
| | - Chung-Mo Park
- Department of Chemistry, Seoul National University, Seoul, South Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
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27
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Cazalis R, Cottam R. An approach to the plant body: Assessing concrete and abstract aspects. Biosystems 2021; 207:104461. [PMID: 34166731 DOI: 10.1016/j.biosystems.2021.104461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/29/2021] [Accepted: 06/16/2021] [Indexed: 01/24/2023]
Abstract
The paper aims at proposing a representation of plants as individuals. The first section selects the population of plants to which this study is addressed. The second section describes the effective architecture of plants as modular systems with fixed and mobile elements, in other words, plants and their extensions. The third section presents how plants integrate the fixed and mobile modules into functional units through three areas of particular relevance to plant growth and development: nutrition, defence and pollination. Based on the tangible elements introduced in the previous sections, the fourth section presents the main issue of the proposal which is not apparent at first glance, namely, the local-global relationship in plants' architecture that determines their individuality as organisms. Finally, in the conclusion, we issue the challenge of developing a collective presentation of plants which satisfies their complementary dimension.
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Affiliation(s)
- Roland Cazalis
- Dept. of 'Sciences, Philosophies, Societies', ESPHIN, NAXYS, University of Namur, Namur, Belgium
| | - Ron Cottam
- The Living Systems Project, Department of Electronics and Informatics, Vrije Universiteit Brussel (VUB), Brussels, Belgium.
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28
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Pan T, Lu D, Xin H, Li B. Biophotonic probes for bio-detection and imaging. LIGHT, SCIENCE & APPLICATIONS 2021; 10:124. [PMID: 34108445 PMCID: PMC8190087 DOI: 10.1038/s41377-021-00561-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/10/2021] [Accepted: 05/21/2021] [Indexed: 05/08/2023]
Abstract
The rapid development of biophotonics and biomedical sciences makes a high demand on photonic structures to be interfaced with biological systems that are capable of manipulating light at small scales for sensitive detection of biological signals and precise imaging of cellular structures. However, conventional photonic structures based on artificial materials (either inorganic or toxic organic) inevitably show incompatibility and invasiveness when interfacing with biological systems. The design of biophotonic probes from the abundant natural materials, particularly biological entities such as virus, cells and tissues, with the capability of multifunctional light manipulation at target sites greatly increases the biocompatibility and minimizes the invasiveness to biological microenvironment. In this review, advances in biophotonic probes for bio-detection and imaging are reviewed. We emphatically and systematically describe biological entities-based photonic probes that offer appropriate optical properties, biocompatibility, and biodegradability with different optical functions from light generation, to light transportation and light modulation. Three representative biophotonic probes, i.e., biological lasers, cell-based biophotonic waveguides and bio-microlenses, are reviewed with applications for bio-detection and imaging. Finally, perspectives on future opportunities and potential improvements of biophotonic probes are also provided.
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Affiliation(s)
- Ting Pan
- Institute of Nanophotonics, Jinan University, Guangzhou, 511443, China
| | - Dengyun Lu
- Institute of Nanophotonics, Jinan University, Guangzhou, 511443, China
| | - Hongbao Xin
- Institute of Nanophotonics, Jinan University, Guangzhou, 511443, China.
| | - Baojun Li
- Institute of Nanophotonics, Jinan University, Guangzhou, 511443, China.
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29
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Sound Waves Promote Arabidopsis thaliana Root Growth by Regulating Root Phytohormone Content. Int J Mol Sci 2021; 22:ijms22115739. [PMID: 34072151 PMCID: PMC8199107 DOI: 10.3390/ijms22115739] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 01/14/2023] Open
Abstract
Sound waves affect plants at the biochemical, physical, and genetic levels. However, the mechanisms by which plants respond to sound waves are largely unknown. Therefore, the aim of this study was to examine the effect of sound waves on Arabidopsis thaliana growth. The results of the study showed that Arabidopsis seeds exposed to sound waves (100 and 100 + 9k Hz) for 15 h per day for 3 day had significantly longer root growth than that in the control group. The root length and cell number in the root apical meristem were significantly affected by sound waves. Furthermore, genes involved in cell division were upregulated in seedlings exposed to sound waves. Root development was affected by the concentration and activity of some phytohormones, including cytokinin and auxin. Analysis of the expression levels of genes regulating cytokinin and auxin biosynthesis and signaling showed that cytokinin and ethylene signaling genes were downregulated, while auxin signaling and biosynthesis genes were upregulated in Arabidopsis exposed to sound waves. Additionally, the cytokinin and auxin concentrations of the roots of Arabidopsis plants increased and decreased, respectively, after exposure to sound waves. Our findings suggest that sound waves are potential agricultural tools for improving crop growth performance.
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30
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Considine MJ, Foyer CH. Oxygen and reactive oxygen species-dependent regulation of plant growth and development. PLANT PHYSIOLOGY 2021; 186:79-92. [PMID: 33793863 PMCID: PMC8154071 DOI: 10.1093/plphys/kiaa077] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 11/29/2020] [Indexed: 05/04/2023]
Abstract
Oxygen and reactive oxygen species (ROS) have been co-opted during evolution into the regulation of plant growth, development, and differentiation. ROS and oxidative signals arising from metabolism or phytohormone-mediated processes control almost every aspect of plant development from seed and bud dormancy, liberation of meristematic cells from the quiescent state, root and shoot growth, and architecture, to flowering and seed production. Moreover, the phytochrome and phytohormone-dependent transmissions of ROS waves are central to the systemic whole plant signaling pathways that integrate root and shoot growth. The sensing of oxygen availability through the PROTEOLYSIS 6 (PRT6) N-degron pathway functions alongside ROS production and signaling but how these pathways interact in developing organs remains poorly understood. Considerable progress has been made in our understanding of the nature of hydrogen peroxide sensors and the role of thiol-dependent signaling networks in the transmission of ROS signals. Reduction/oxidation (redox) changes in the glutathione (GSH) pool, glutaredoxins (GRXs), and thioredoxins (TRXs) are important in the control of growth mediated by phytohormone pathways. Although, it is clear that the redox states of proteins involved in plant growth and development are controlled by the NAD(P)H thioredoxin reductase (NTR)/TRX and reduced GSH/GRX systems of the cytosol, chloroplasts, mitochondria, and nucleus, we have only scratched the surface of this multilayered control and how redox-regulated processes interact with other cell signaling systems.
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Affiliation(s)
- Michael J Considine
- The School of Molecular Sciences, The University of Western Australia, Perth, Western Australia 6009, Australia
| | - Christine H Foyer
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT, UK
- Author for communication:
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31
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Phytochrome Mediated Responses in Agrobacterium fabrum: Growth, Motility and Plant Infection. Curr Microbiol 2021; 78:2708-2719. [PMID: 34023916 PMCID: PMC8213605 DOI: 10.1007/s00284-021-02526-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 04/28/2021] [Indexed: 02/05/2023]
Abstract
The soil bacterium and plant pathogen Agrobacterium fabrum C58 has two phytochrome photoreceptors, Agp1 and Agp2. We found that plant infection and tumor induction by A. fabrum is down-regulated by light and that phytochrome knockout mutants of A. fabrum have diminished infection rates. The regulation pattern of infection matches with that of bacterial conjugation reported earlier, suggesting similar regulatory mechanisms. In the regulation of conjugation and plant infection, phytochromes are active in darkness. This is a major difference to plant phytochromes, which are typically active after irradiation. We also found that propagation and motility were affected in agp1− and agp2− knockout mutants, although propagation was not always affected by light. The regulatory patterns can partially but not completely be explained by modulated histidine kinase activities of Agp1 and Agp2. In a mass spectrometry-based proteomic study, 24 proteins were different between light and dark grown A. fabrum, whereas 382 proteins differed between wild type and phytochrome knockout mutants, pointing again to light independent roles of Agp1 and Agp2.
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32
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Guo Z, Xu J, Wang Y, Hu C, Shi K, Zhou J, Xia X, Zhou Y, Foyer CH, Yu J. The phyB-dependent induction of HY5 promotes iron uptake by systemically activating FER expression. EMBO Rep 2021; 22:e51944. [PMID: 34018302 DOI: 10.15252/embr.202051944] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 03/26/2021] [Accepted: 04/21/2021] [Indexed: 11/09/2022] Open
Abstract
Iron (Fe) deficiency affects global crop productivity and human health. However, the role of light signaling in plant Fe uptake remains uncharacterized. Here, we find that light-induced Fe uptake in tomato (Solanum lycopersicum L.) is largely dependent on phytochrome B (phyB). Light induces the phyB-dependent accumulation of ELONGATED HYPOCOTYL 5 (HY5) protein both in the leaves and roots. HY5 movement from shoots to roots activates the expression of FER transcription factor, leading to the accumulation of transcripts involved in Fe uptake. Mutation in FER abolishes the light quality-induced changes in Fe uptake. The low Fe uptake observed in phyB, hy5, and fer mutants is accompanied by lower photosynthetic electron transport rates. Exposure to red light at night increases Fe accumulation in wild-type fruit but has little effects on fruit of phyB mutants. Taken together, these results demonstrate that Fe uptake is systemically regulated by light in a phyB-HY5-FER-dependent manner. These findings provide new insights how the manipulation of light quality could be used to improve Fe uptake and hence the nutritional quality of crops.
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Affiliation(s)
- Zhixin Guo
- Department of Horticulture, Zhejiang University, Hangzhou, China
| | - Jin Xu
- Department of Horticulture, Zhejiang University, Hangzhou, China
| | - Yu Wang
- Department of Horticulture, Zhejiang University, Hangzhou, China
| | - Chaoyi Hu
- Department of Horticulture, Zhejiang University, Hangzhou, China
| | - Kai Shi
- Department of Horticulture, Zhejiang University, Hangzhou, China.,Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Hangzhou, China
| | - Jie Zhou
- Department of Horticulture, Zhejiang University, Hangzhou, China.,Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Hangzhou, China
| | - Xiaojian Xia
- Department of Horticulture, Zhejiang University, Hangzhou, China.,Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Hangzhou, China
| | - Yanhong Zhou
- Department of Horticulture, Zhejiang University, Hangzhou, China.,Key Laboratory of Horticultural Plants Growth and Development, Agricultural Ministry of China, Hangzhou, China
| | - Christine H Foyer
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, UK
| | - Jingquan Yu
- Department of Horticulture, Zhejiang University, Hangzhou, China
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33
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Paajanen P, Lane de Barros Dantas L, Dodd AN. Layers of crosstalk between circadian regulation and environmental signalling in plants. Curr Biol 2021; 31:R399-R413. [PMID: 33905701 DOI: 10.1016/j.cub.2021.03.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Circadian regulation has a pervasive influence upon plant development, physiology and metabolism, impacting upon components of fitness and traits of agricultural importance. Circadian regulation is inextricably connected to the responses of plants to their abiotic environments, from the cellular to whole plant scales. Here, we review the crosstalk that occurs between circadian regulation and responses to the abiotic environment from the intracellular scale through to naturally fluctuating environments. We examine the spatial crosstalk that forms part of plant circadian regulation, at the subcellular, tissue, organ and whole-plant scales. This includes a focus on chloroplast and mitochondrial signalling, alternative splicing, long-distance circadian signalling and circadian regulation within natural environments. We also consider mathematical models for plant circadian regulation, to suggest future areas for advancing understanding of roles for circadian regulation in plant responses to environmental cues.
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Affiliation(s)
- Pirita Paajanen
- John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK
| | | | - Antony N Dodd
- John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK.
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34
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Quian-Ulloa R, Stange C. Carotenoid Biosynthesis and Plastid Development in Plants: The Role of Light. Int J Mol Sci 2021; 22:1184. [PMID: 33530294 PMCID: PMC7866012 DOI: 10.3390/ijms22031184] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 12/23/2022] Open
Abstract
Light is an important cue that stimulates both plastid development and biosynthesis of carotenoids in plants. During photomorphogenesis or de-etiolation, photoreceptors are activated and molecular factors for carotenoid and chlorophyll biosynthesis are induced thereof. In fruits, light is absorbed by chloroplasts in the early stages of ripening, which allows a gradual synthesis of carotenoids in the peel and pulp with the onset of chromoplasts' development. In roots, only a fraction of light reaches this tissue, which is not required for carotenoid synthesis, but it is essential for root development. When exposed to light, roots start greening due to chloroplast development. However, the colored taproot of carrot grown underground presents a high carotenoid accumulation together with chromoplast development, similar to citrus fruits during ripening. Interestingly, total carotenoid levels decrease in carrots roots when illuminated and develop chloroplasts, similar to normal roots exposed to light. The recent findings of the effect of light quality upon the induction of molecular factors involved in carotenoid synthesis in leaves, fruit, and roots are discussed, aiming to propose consensus mechanisms in order to contribute to the understanding of carotenoid synthesis regulation by light in plants.
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Affiliation(s)
| | - Claudia Stange
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
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35
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Du M, Wang Y, Chen H, Han R. Actin filaments mediated root growth inhibition by changing their distribution under UV-B and hydrogen peroxide exposure in Arabidopsis. Biol Res 2020; 53:54. [PMID: 33228803 PMCID: PMC7685599 DOI: 10.1186/s40659-020-00321-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 11/11/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND UV-B signaling in plants is mediated by UVR8, which interacts with transcriptional factors to induce root morphogenesis. However, research on the downstream molecules of UVR8 signaling in roots is still scarce. As a wide range of functional cytoskeletons, how actin filaments respond to UV-B-induced root morphogenesis has not been reported. The aim of this study was to investigate the effect of actin filaments on root morphogenesis under UV-B and hydrogen peroxide exposure in Arabidopsis. RESULTS A Lifeact-Venus fusion protein was used to stain actin filaments in Arabidopsis. The results showed that UV-B inhibited hypocotyl and root elongation and caused an increase in H2O2 content only in the root but not in the hypocotyl. Additionally, the actin filaments in hypocotyls diffused under UV-B exposure but were gathered in a bundle under the control conditions in either Lifeact-Venus or uvr8 plants. Exogenous H2O2 inhibited root elongation in a dose-dependent manner. The actin filaments changed their distribution from filamentous to punctate in the root tips and mature regions at a lower concentration of H2O2 but aggregated into thick bundles with an abnormal orientation at H2O2 concentrations up to 2 mM. In the root elongation zone, the actin filament arrangement changed from lateral to longitudinal after exposure to H2O2. Actin filaments in the root tip and elongation zone were depolymerized into puncta under UV-B exposure, which showed the same tendency as the low-concentration treatments. The actin filaments were hardly filamentous in the maturation zone. The dynamics of actin filaments in the uvr8 group under UV-B exposure were close to those of the control group. CONCLUSIONS The results indicate that UV-B inhibited Arabidopsis hypocotyl elongation by reorganizing actin filaments from bundles to a loose arrangement, which was not related to H2O2. UV-B disrupted the dynamics of actin filaments by changing the H2O2 level in Arabidopsis roots. All these results provide an experimental basis for investigating the interaction of UV-B signaling with the cytoskeleton.
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Affiliation(s)
- Meiting Du
- Higher Education Key Laboratory of Plant Molecular and Environmental Stress Response, Shanxi Normal University in Shanxi Province, Linfen, 041000, Shanxi, China
| | - Yanhong Wang
- School of Life Sciences, Linfen, 041000, Shanxi, China
| | - Huize Chen
- Higher Education Key Laboratory of Plant Molecular and Environmental Stress Response, Shanxi Normal University in Shanxi Province, Linfen, 041000, Shanxi, China. .,School of Life Sciences, Linfen, 041000, Shanxi, China.
| | - Rong Han
- Higher Education Key Laboratory of Plant Molecular and Environmental Stress Response, Shanxi Normal University in Shanxi Province, Linfen, 041000, Shanxi, China. .,School of Life Sciences, Linfen, 041000, Shanxi, China.
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36
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Deepika, Ankit, Sagar S, Singh A. Dark-Induced Hormonal Regulation of Plant Growth and Development. FRONTIERS IN PLANT SCIENCE 2020; 11:581666. [PMID: 33117413 PMCID: PMC7575791 DOI: 10.3389/fpls.2020.581666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 09/16/2020] [Indexed: 05/04/2023]
Abstract
The sessile nature of plants has made them extremely sensitive and flexible toward the constant flux of the surrounding environment, particularly light and dark. The light is perceived as a signal by specific receptors which further transduce the information through the signaling intermediates and effector proteins to modulate gene expression. Signal transduction induces changes in hormone levels that alters developmental, physiological and morphological processes. Importance of light for plants growth is well recognized, but a holistic understanding of key molecular and physiological changes governing plants development under dark is awaited. Here, we describe how darkness acts as a signal causing alteration in hormone levels and subsequent modulation of the gene regulatory network throughout plant life. The emphasis of this review is on dark mediated changes in plant hormones, regulation of signaling complex COP/DET/FUS and the transcription factors PIFs which affects developmental events such as apical hook development, elongated hypocotyls, photoperiodic flowering, shortened roots, and plastid development. Furthermore, the role of darkness in shade avoidance and senescence is discussed.
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Affiliation(s)
| | | | | | - Amarjeet Singh
- National Institute of Plant Genome Research, New Delhi, India
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37
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Du MT, Zhu GL, Chen HZ, Han R. Actin filaments altered distribution in wheat (Triticum aestivum) "Bending Root" to respond to enhanced Ultraviolet-B radiation. BRAZ J BIOL 2020; 81:684-691. [PMID: 32935819 DOI: 10.1590/1519-6984.229774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 03/28/2020] [Indexed: 11/22/2022] Open
Abstract
Plants adjust their shoot growth to acclimate to changing environmental factors, such as to enhanced Ultraviolet-B (UV-B) radiation. However, people have ignored that plant roots can also respond to UV-B light. Here, we find the morphology curled wheat roots under UV-B radiation, that we call, "bending roots." The curly region is the transition zone of the root after observed at the cellular level. After exposed to enhanced UV-B radiation for 2 d (10.08 KJ/m2/d), cell size decreased and actin filaments gathered in wheat roots. We also find that H2O2 production increased and that content of the indole-3-acetic acid (IAA) increased remarkably. The pharmacological experiment revealed that actin filaments gathered and polymerized into bundles in the wheat root cells after irrigated H2O2 and IAA. These results indicated that actin filaments changed their distribution and formed the "bending root," which was related to H2O2 production and increase in IAA. Overall, actin filaments in wheat root cells could be a subcellular target of UV-B radiation, and its disruption determines root morphology.
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Affiliation(s)
- M T Du
- Shanxi Normal University, Higher Education Key Laboratory of Plant Molecular and Environment Stress Response, Linfen, Shanxi, China
| | - G L Zhu
- Ministry of Education of China, Yangzhou University, Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou, Jiangsu, China
| | - H Z Chen
- Shanxi Normal University, Higher Education Key Laboratory of Plant Molecular and Environment Stress Response, Linfen, Shanxi, China
| | - R Han
- Shanxi Normal University, Higher Education Key Laboratory of Plant Molecular and Environment Stress Response, Linfen, Shanxi, China
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38
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Burko Y, Gaillochet C, Seluzicki A, Chory J, Busch W. Local HY5 Activity Mediates Hypocotyl Growth and Shoot-to-Root Communication. PLANT COMMUNICATIONS 2020; 1:100078. [PMID: 32995748 PMCID: PMC7521671 DOI: 10.1016/j.xplc.2020.100078] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 05/08/2020] [Accepted: 05/12/2020] [Indexed: 05/18/2023]
Abstract
Plants optimize their growth in fluctuating environments using information acquired by different organs. This information is then transmitted through the rest of the plant using both short- and long-distance signals, including hormones and mobile proteins. Although a few of these signals have been characterized, long-distance signaling is not well understood in plants. Recently, the light-regulated transcription factor HY5 was reported to move from the shoot to the root to regulate root growth. We generated a cell-type specifically expressed HY5 fusion protein that could not be detected outside the tissue in which it was targeted. By expressing this DOF-HY5 protein in specific cell types of the hypocotyl, we showed that its local activity was sufficient to regulate hypocotyl growth. We also found that, although DOF-HY5 was expressed specifically in the shoot and not detected in the roots, it could rescue hy5 growth defects in primary roots but not in lateral roots. We therefore conclude that HY5 protein mobility is not required in the hypocotyl or for shoot-to-root communication. Our results indicate that a signal downstream of, or in parallel with, HY5 in the shoot is mobile and links shoot and root growth.
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Affiliation(s)
- Yogev Burko
- Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
- Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Christophe Gaillochet
- Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Adam Seluzicki
- Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
- Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Joanne Chory
- Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
- Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Wolfgang Busch
- Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
- Integrative Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
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39
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Arias D, Maldonado J, Silva H, Stange C. A de novo transcriptome analysis revealed that photomorphogenic genes are required for carotenoid synthesis in the dark-grown carrot taproot. Mol Genet Genomics 2020; 295:1379-1392. [PMID: 32656704 DOI: 10.1007/s00438-020-01707-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 07/03/2020] [Indexed: 12/20/2022]
Abstract
Carotenoids are terpenoid pigments synthesized by all photosynthetic and some non-photosynthetic organisms. In plants, these lipophilic compounds are involved in photosynthesis, photoprotection, and phytohormone synthesis. In plants, carotenoid biosynthesis is induced by several environmental factors such as light including photoreceptors, such as phytochromes (PHYs) and negatively regulated by phytochrome interacting factors (PIFs). Daucus carota (carrot) is one of the few plant species that synthesize and accumulate carotenoids in the storage root that grows in darkness. Contrary to other plants, light inhibits secondary root growth and carotenoid accumulation suggesting the existence of new mechanisms repressed by light that regulate both processes. To identify genes induced by dark and repressed by light that regulate carotenoid synthesis and carrot root development, in this work an RNA-Seq analysis was performed from dark- and light-grown carrot roots. Using this high-throughput sequencing methodology, a de novo transcriptome model with 63,164 contigs was obtained, from which 18,488 were differentially expressed (DEG) between the two experimental conditions. Interestingly, light-regulated genes are preferably expressed in dark-grown roots. Enrichment analysis of GO terms with DEGs genes, validation of the transcriptome model and DEG analysis through qPCR allow us to hypothesize that genes involved in photomorphogenesis and light perception such as PHYA, PHYB, PIF3, PAR1, CRY2, FYH3, FAR1 and COP1 participate in the synthesis of carotenoids and carrot storage root development.
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Affiliation(s)
- Daniela Arias
- Facultad de Ciencias, Centro de Biología Molecular Vegetal, Universidad de Chile, Las Palmeras, 3425, Ñuñoa, Santiago, Chile
| | - Jonathan Maldonado
- Laboratorio de Genómica Funcional & Bioinformática, Facultad de Ciencias Agronómicas, Universidad de Chile, Av. Santa Rosa 11315, 8820808, La Pintana, Santiago, Chile
| | - Herman Silva
- Laboratorio de Genómica Funcional & Bioinformática, Facultad de Ciencias Agronómicas, Universidad de Chile, Av. Santa Rosa 11315, 8820808, La Pintana, Santiago, Chile
| | - Claudia Stange
- Facultad de Ciencias, Centro de Biología Molecular Vegetal, Universidad de Chile, Las Palmeras, 3425, Ñuñoa, Santiago, Chile.
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40
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De-Jesús-García R, Rosas U, Dubrovsky JG. The barrier function of plant roots: biological bases for selective uptake and avoidance of soil compounds. FUNCTIONAL PLANT BIOLOGY : FPB 2020; 47:383-397. [PMID: 32213271 DOI: 10.1071/fp19144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 12/16/2019] [Indexed: 06/10/2023]
Abstract
The root is the main organ through which water and mineral nutrients enter the plant organism. In addition, root fulfils several other functions. Here, we propose that the root also performs the barrier function, which is essential not only for plant survival but for plant acclimation and adaptation to a constantly changing and heterogeneous soil environment. This function is related to selective uptake and avoidance of some soil compounds at the whole plant level. We review the toolkit of morpho-anatomical, structural, and other components that support this view. The components of the root structure involved in selectivity, permeability or barrier at a cellular, tissue, and organ level and their properties are discussed. In consideration of the arguments supporting barrier function of plant roots, evolutionary aspects of this function are also reviewed. Additionally, natural variation in selective root permeability is discussed which suggests that the barrier function is constantly evolving and is subject of natural selection.
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Affiliation(s)
- Ramces De-Jesús-García
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenuenida Universidad 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, Mexico
| | - Ulises Rosas
- Jardín Botánico, Instituto de Biología, Universidad Nacional Autónoma de México, 04510, CDMX, Mexico
| | - Joseph G Dubrovsky
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenuenida Universidad 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, Mexico; and Corresponding author.
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41
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Yang Y, Liu H. Coordinated Shoot and Root Responses to Light Signaling in Arabidopsis. PLANT COMMUNICATIONS 2020; 1:100026. [PMID: 33367230 PMCID: PMC7748005 DOI: 10.1016/j.xplc.2020.100026] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 01/14/2020] [Accepted: 01/16/2020] [Indexed: 05/05/2023]
Abstract
Light is one of the most important environmental signals and regulates many biological processes in plants. Studies on light-regulated development have mainly focused on aspects of shoot growth, such as de-etiolation, cotyledon opening, inhibition of hypocotyl elongation, flowering, and anthocyanin accumulation. However, recent studies have demonstrated that light is also involved in regulating root growth and development in Arabidopsis. In this review, we summarize the progress in understanding how shoots and roots coordinate their responses to light through different light-signaling components and pathways, including the COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1), HY5 (ELONGATED HYPOCOTYL 5), and MYB73/MYB77 (MYB DOMAIN PROTEIN 73/77) pathways.
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Affiliation(s)
- Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, P. R. China
- University of Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, P. R. China
- Corresponding author
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42
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Greenwood M, Locke JC. The circadian clock coordinates plant development through specificity at the tissue and cellular level. CURRENT OPINION IN PLANT BIOLOGY 2020; 53:65-72. [PMID: 31783323 DOI: 10.1016/j.pbi.2019.09.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/20/2019] [Accepted: 09/23/2019] [Indexed: 05/27/2023]
Abstract
The circadian clock is a genetic circuit that allows organisms to anticipate daily events caused by the rotation of the Earth. The plant clock regulates physiology at multiple scales, from cell division to ecosystem-scale interactions. It is becoming clear that rather than being a single perfectly synchronised timer throughout the plant, the clock can be sensitive to different cues, run at different speeds, and drive distinct processes in different cell types and tissues. This flexibility may help the plant clock to regulate such a range of developmental and physiological processes. In this review, using examples from the literature, we describe how the clock regulates development at multiple scales and discuss how the clock might allow local flexibility in regulation whilst remaining coordinated across the plant.
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Affiliation(s)
- Mark Greenwood
- Sainsbury Laboratory, University of Cambridge, Bateman Street, Cambridge, UK; Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, UK
| | - James Cw Locke
- Sainsbury Laboratory, University of Cambridge, Bateman Street, Cambridge, UK.
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43
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Mukherjee S, Jemielita M, Stergioula V, Tikhonov M, Bassler BL. Photosensing and quorum sensing are integrated to control Pseudomonas aeruginosa collective behaviors. PLoS Biol 2019; 17:e3000579. [PMID: 31830037 PMCID: PMC6932827 DOI: 10.1371/journal.pbio.3000579] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/26/2019] [Accepted: 11/26/2019] [Indexed: 01/28/2023] Open
Abstract
Bacteria convert changes in sensory inputs into alterations in gene expression, behavior, and lifestyles. A common lifestyle choice that bacteria make is whether to exhibit individual behavior and exist in the free-living planktonic state or to engage in collective behavior and form sessile communities called biofilms. Transitions between individual and collective behaviors are controlled by the chemical cell-to-cell communication process called quorum sensing. Here, we show that quorum sensing represses Pseudomonas aeruginosa biofilm formation and virulence by activating expression of genes encoding the KinB–AlgB two-component system (TCS). Phospho-AlgB represses biofilm and virulence genes, while KinB dephosphorylates and thereby inactivates AlgB. We discover that the photoreceptor BphP is the kinase that, in response to light, phosphorylates and activates AlgB. Indeed, exposing P. aeruginosa to light represses biofilm formation and virulence gene expression. To our knowledge, P. aeruginosa was not previously known to detect and respond to light. The KinB–AlgB–BphP module is present in all pseudomonads, and we demonstrate that AlgB is the partner response regulator for BphP in diverse bacterial phyla. We propose that in the KinB–AlgB–BphP system, AlgB functions as the node at which varied sensory information is integrated. This network architecture provides a mechanism enabling bacteria to integrate at least two different sensory inputs, quorum sensing (via RhlR-driven activation of algB) and light (via BphP–AlgB), into the control of collective behaviors. This study sets the stage for light-mediated control of P. aeruginosa infectivity. Photosensing and quorum sensing are integrated to control collective behaviors of the pathogenic bacterium Pseudomonas aeruginosa; the information is transduced via a phosphorylation–dephosphorylation sensory system. The study has implications for light-mediated control of P. aeruginosa infectivity.
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Affiliation(s)
- Sampriti Mukherjee
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
| | - Matthew Jemielita
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
| | - Vasiliki Stergioula
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
| | - Mikhail Tikhonov
- Physics Department, Washington University in St. Louis, St. Louis, Missouri, United States of America
| | - Bonnie L. Bassler
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
- Howard Hughes Medical Institute, Chevy Chase, Maryland, United States of America
- * E-mail:
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44
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Regulation of Photomorphogenic Development by Plant Phytochromes. Int J Mol Sci 2019; 20:ijms20246165. [PMID: 31817722 PMCID: PMC6941077 DOI: 10.3390/ijms20246165] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 12/03/2022] Open
Abstract
Photomorphogenesis and skotomorphogenesis are two key events that control plant development, from seed germination to flowering and senescence. A group of wavelength-specific photoreceptors, E3 ubiquitin ligases, and various transcription factors work together to regulate these two critical processes. Phytochromes are the main photoreceptors in plants for perceiving red/far-red light and transducing the light signals to downstream factors that regulate the gene expression network for photomorphogenic development. In this review, we highlight key developmental stages in the life cycle of plants and how phytochromes and other components in the phytochrome signaling pathway play roles in plant growth and development.
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45
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Yang Y, Zhang L, Chen P, Liang T, Li X, Liu H. UV-B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development. EMBO J 2019; 39:e101928. [PMID: 31777974 DOI: 10.15252/embj.2019101928] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 10/21/2019] [Accepted: 10/24/2019] [Indexed: 12/31/2022] Open
Abstract
The UV-B photoreceptor UVR8 mediates multiple UV-B responses in plants, but the function of UVR8 in regulating root development has not previously been investigated. Here, we show that UV-B light inhibits Arabidopsis lateral root growth in a UVR8-dependent manner. Monomeric UVR8 inhibits auxin responses in a tissue-autonomous manner and thereby regulates lateral root growth. Genome-wide gene expression analysis demonstrated that auxin and UV-B irradiation antagonistically regulate auxin-regulated gene expression. We further show that UVR8 physically interacts with MYB73/MYB77 (MYB DOMAIN PROTEIN 73/77) in a UV-B-dependent manner. UVR8 inhibits lateral root development via regulation of MYB73/MYB77. When activated by UV-B light, UVR8 localizes to the nucleus and inhibits the DNA-binding activities of MYB73/MYB77 and directly represses the transcription of their target auxin-responsive genes. Our results demonstrate that UV-B light and UVR8 are critical for both shoot morphogenesis and root development. The UV-B-dependent interaction of UVR8 and MYB73/MYB77 serves as an important module that integrates light and auxin signaling and represents a new UVR8 signaling mechanism in plants.
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Affiliation(s)
- Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Shanghai, China
| | - Libo Zhang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China
| | - Ping Chen
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China.,The Joint Center for Infection and Immunity between Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Tong Liang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Shanghai, China
| | - Xuan Li
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, China
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46
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Molecular mechanisms underlying phytochrome-controlled morphogenesis in plants. Nat Commun 2019; 10:5219. [PMID: 31745087 PMCID: PMC6864062 DOI: 10.1038/s41467-019-13045-0] [Citation(s) in RCA: 178] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 10/17/2019] [Indexed: 11/08/2022] Open
Abstract
Phytochromes are bilin-binding photosensory receptors which control development over a broad range of environmental conditions and throughout the whole plant life cycle. Light-induced conformational changes enable phytochromes to interact with signaling partners, in particular transcription factors or proteins that regulate them, resulting in large-scale transcriptional reprograming. Phytochromes also regulate promoter usage, mRNA splicing and translation through less defined routes. In this review we summarize our current understanding of plant phytochrome signaling, emphasizing recent work performed in Arabidopsis. We compare and contrast phytochrome responses and signaling mechanisms among land plants and highlight open questions in phytochrome research.
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47
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Miotto YE, Tesser da Costa C, de Oliveira BH, Guzman F, Margis R, de Almeida RMC, Offringa R, Dos Santos Maraschin F. Identification of root transcriptional responses to shoot illumination in Arabidopsis thaliana. PLANT MOLECULAR BIOLOGY 2019; 101:487-498. [PMID: 31560104 DOI: 10.1007/s11103-019-00918-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 09/21/2019] [Indexed: 05/25/2023]
Abstract
The transcriptional profile of roots is highly affected by shoot illumination. Transcriptogram analysis allows the identification of cellular processes that are not detected by DESeq. Light is a key environmental factor regulating plant growth and development. Arabidopsis thaliana seedlings grown under light display a photomorphogenic development pattern, showing short hypocotyl and long roots. On the other hand, when grown in darkness, they display skotomorphogenic development, with long hypocotyls and short roots. Although many signals from shoots might be important for triggering root growth, the early transcriptional responses that stimulate primary root elongation are still unknown. Here, we aimed to investigate which genes are involved in the early photomorphogenic root development of dark grown roots. We found that 1616 genes 4 days after germination (days-old), and 3920 genes 7 days-old were differently expressed in roots when the shoot was exposed to light. Of these genes, 979 were up regulated in 4 days and 2784 at 7 days-old. We compared the functional categorization of differentially regulated processes by two methods: GO term enrichment and transcriptogram analysis. Expression analysis of nine selected candidate genes in roots confirmed the data observed in the RNA-seq analysis. Loss-of-function mutants of these selected differentially expressed genes suggest the involvement of these genes in root development in response to shoot illumination. Our findings are consistent with the observation that dark grown roots respond to the shoot-perceived aboveground light environment.
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Affiliation(s)
- Yohanna Evelyn Miotto
- PPGBM - Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Cibele Tesser da Costa
- PPGBM - Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
- PPGBOT - Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Ben Hur de Oliveira
- PPGBCM - Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Frank Guzman
- PPGBCM - Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Rogério Margis
- PPGBCM - Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil
| | - Rita Maria Cunha de Almeida
- Instituto de Física and Instituto Nacional de Ciência e Tecnologia: Sistemas Complexos, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Programa de Pós Graduação em Bioinformática, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - Remko Offringa
- Plant Developmental Genetics, Institute of Biology Leiden, Leiden University, Leiden, The Netherlands
| | - Felipe Dos Santos Maraschin
- PPGBM - Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil.
- PPGBOT - Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil.
- Departamento de Botânica, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, Prédio 43.423, sala 216, Porto Alegre, RS, CEP 91501-970, Brazil.
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Anna BB, Grzegorz B, Marek K, Piotr G, Marcin F. Exposure to High-Intensity Light Systemically Induces Micro-Transcriptomic Changes in Arabidopsis thaliana Roots. Int J Mol Sci 2019; 20:ijms20205131. [PMID: 31623174 PMCID: PMC6829545 DOI: 10.3390/ijms20205131] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/14/2019] [Accepted: 10/15/2019] [Indexed: 01/25/2023] Open
Abstract
In full sunlight, plants often experience a light intensity exceeding their photosynthetic capacity and causing the activation of a set of photoprotective mechanisms. Numerous reports have explained, on the molecular level, how plants cope with light stress locally in photosynthesizing leaves; however, the response of below-ground organs to above-ground perceived light stress is still largely unknown. Since small RNAs are potent integrators of multiple processes including stress responses, here, we focus on changes in the expression of root miRNAs upon high-intensity-light (HL) stress. To achieve this, we used Arabidopsis thaliana plants growing in hydroponic conditions. The expression of several genes that are known as markers of redox changes was examined over time, with the results showing that typical HL stress signals spread to the below-ground organs. Additionally, micro-transcriptomic analysis of systemically stressed roots revealed a relatively limited reaction, with only 17 up-regulated and five down-regulated miRNAs. The differential expression of candidates was confirmed by RT-qPCR. Interestingly, the detected differences in miRNA abundance disappeared when the roots were separated from the shoots before HL treatment. Thus, our results show that the light stress signal is induced in rosettes and travels through the plant to affect root miRNA levels. Although the mechanism of this regulation is unknown, the engagement of miRNA may create a regulatory platform orchestrating adaptive responses to various simultaneous stresses. Consequently, further research on systemically HL-regulated miRNAs and their respective targets has the potential to identify attractive sequences for engineering stress tolerance in plants.
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Affiliation(s)
- Barczak-Brzyżek Anna
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences-SGGW, 02-776 Warszawa, Poland.
| | - Brzyżek Grzegorz
- Institute of Biochemistry and Biophysics Polish Academy of Sciences, 02-106 Warszawa, Poland.
| | - Koter Marek
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences-SGGW, 02-776 Warszawa, Poland.
| | - Gawroński Piotr
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences-SGGW, 02-776 Warszawa, Poland.
| | - Filipecki Marcin
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences-SGGW, 02-776 Warszawa, Poland.
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Coordinated circadian timing through the integration of local inputs in Arabidopsis thaliana. PLoS Biol 2019; 17:e3000407. [PMID: 31415556 PMCID: PMC6695092 DOI: 10.1371/journal.pbio.3000407] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 07/11/2019] [Indexed: 12/14/2022] Open
Abstract
Individual plant cells have a genetic circuit, the circadian clock, that times key processes to the day-night cycle. These clocks are aligned to the day-night cycle by multiple environmental signals that vary across the plant. How does the plant integrate clock rhythms, both within and between organs, to ensure coordinated timing? To address this question, we examined the clock at the sub-tissue level across Arabidopsis thaliana seedlings under multiple environmental conditions and genetic backgrounds. Our results show that the clock runs at different speeds (periods) in each organ, which causes the clock to peak at different times across the plant in both constant environmental conditions and light-dark (LD) cycles. Closer examination reveals that spatial waves of clock gene expression propagate both within and between organs. Using a combination of modeling and experiment, we reveal that these spatial waves are the result of the period differences between organs and local coupling, rather than long-distance signaling. With further experiments we show that the endogenous period differences, and thus the spatial waves, can be generated by the organ specificity of inputs into the clock. We demonstrate this by modulating periods using light and metabolic signals, as well as with genetic perturbations. Our results reveal that plant clocks can be set locally by organ-specific inputs but coordinated globally via spatial waves of clock gene expression. Computational modeling and experiments with Arabidopsis thaliana reveal a new mechanism for the coordination of circadian timing across an organism, acting through a combination of organ-specific sensitivity to environmental inputs and local cell-cell coupling.
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50
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Kumari S, Yadav S, Patra D, Singh S, Sarkar AK, Panigrahi KCS. Uncovering the molecular signature underlying the light intensity-dependent root development in Arabidopsis thaliana. BMC Genomics 2019; 20:596. [PMID: 31325959 PMCID: PMC6642530 DOI: 10.1186/s12864-019-5933-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 06/24/2019] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Root morphology is known to be affected by light quality, quantity and direction. Light signal is perceived at the shoot, translocated to roots through vasculature and further modulates the root development. Photoreceptors are differentially expressed in both shoot and root cells. The light irradiation to the root affects shoot morphology as well as whole plant development. The current work aims to understand the white light intensity dependent changes in root patterning and correlate that with the global gene expression profile. RESULTS Different fluence of white light (WL) regulate overall root development via modulating the expression of a specific set of genes. Phytochrome A deficient Arabidopsis thaliana (phyA-211) showed shorter primary root compared to phytochrome B deficient (phyB-9) and wild type (WT) seedlings at a lower light intensity. However, at higher intensity, both mutants showed shorter primary root in comparison to WT. The lateral root number was observed to be lowest in phyA-211 at intensities of 38 and 75 μmol m - 2 s - 1. The number of adventitious roots was significantly lower in phyA-211 as compared to WT and phyB-9 under all light intensities tested. With the root phenotypic data, microarray was performed for four different intensities of WL light in WT. Here, we identified ~ 5243 differentially expressed genes (DEGs) under all light intensities. Gene ontology-based analysis indicated that different intensities of WL predominantly affect a subset of genes having catalytic activity and localized to the cytoplasm and membrane. Furthermore, when root is irradiated with different intensities of WL, several key genes involved in hormone, light signaling and clock-regulated pathways are differentially expressed. CONCLUSION Using genome wide microarray-based approach, we have identified candidate genes in Arabidopsis root that responded to the changes in light intensities. Alteration in expression of genes such as PIF4, COL9, EPR1, CIP1, ARF18, ARR6, SAUR9, TOC1 etc. which are involved in light, hormone and clock pathway was validated by qRT-PCR. This indicates their potential role in light intensity mediated root development.
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Affiliation(s)
- Sony Kumari
- School of Biological Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), P.O. Bhimpur- Padanpur, Via Jatni, Dist. Khurda, Odisha, 752050, India
| | - Sandeep Yadav
- National Institute of Plant Genome Research (NIPGR), Jawaharlal Nehru University Campus, Aruna Asaf Ali Marg, New Delhi, Delhi, 110067, India
| | - Debadutta Patra
- School of Biological Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), P.O. Bhimpur- Padanpur, Via Jatni, Dist. Khurda, Odisha, 752050, India
| | - Sharmila Singh
- National Institute of Plant Genome Research (NIPGR), Jawaharlal Nehru University Campus, Aruna Asaf Ali Marg, New Delhi, Delhi, 110067, India
| | - Ananda K Sarkar
- National Institute of Plant Genome Research (NIPGR), Jawaharlal Nehru University Campus, Aruna Asaf Ali Marg, New Delhi, Delhi, 110067, India
| | - Kishore C S Panigrahi
- School of Biological Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), P.O. Bhimpur- Padanpur, Via Jatni, Dist. Khurda, Odisha, 752050, India.
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