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Demircan N, Sonmez MC, Akyol TY, Ozgur R, Turkan I, Dietz KJ, Uzilday B. Alternative electron sinks in chloroplasts and mitochondria of halophytes as a safety valve for controlling ROS production during salinity. PHYSIOLOGIA PLANTARUM 2024; 176:e14397. [PMID: 38894507 DOI: 10.1111/ppl.14397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/07/2024] [Accepted: 05/12/2024] [Indexed: 06/21/2024]
Abstract
Electron flow through the electron transport chain (ETC) is essential for oxidative phosphorylation in mitochondria and photosynthesis in chloroplasts. Electron fluxes depend on environmental parameters, e.g., ionic and osmotic conditions and endogenous factors, and this may cause severe imbalances. Plants have evolved alternative sinks to balance the reductive load on the electron transport chains in order to avoid overreduction, generation of reactive oxygen species (ROS), and to cope with environmental stresses. These sinks act primarily as valves for electron drainage and secondarily as regulators of tolerance-related metabolism, utilizing the excess reductive energy. High salinity is an environmental stressor that stimulates the generation of ROS and oxidative stress, which affects growth and development by disrupting the redox homeostasis of plants. While glycophytic plants are sensitive to high salinity, halophytic plants tolerate, grow, and reproduce at high salinity. Various studies have examined the ETC systems of glycophytic plants, however, information about the state and regulation of ETCs in halophytes under non-saline and saline conditions is scarce. This review focuses on alternative electron sinks in chloroplasts and mitochondria of halophytic plants. In cases where information on halophytes is lacking, we examined the available knowledge on the relationship between alternative sinks and gradual salinity resilience of glycophytes. To this end, transcriptional responses of involved components of photosynthetic and respiratory ETCs were compared between the glycophyte Arabidopsis thaliana and the halophyte Schrenkiella parvula, and the time-courses of these transcripts were examined in A. thaliana. The observed regulatory patterns are discussed in the context of reactive molecular species formation in halophytes and glycophytes.
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Affiliation(s)
- Nil Demircan
- Department of Biology, Faculty of Science, Ege University, Izmir, Türkiye
| | | | - Turgut Yigit Akyol
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Rengin Ozgur
- Department of Biology, Faculty of Science, Ege University, Izmir, Türkiye
| | - Ismail Turkan
- Department of Soil and Plant Nutrition, Faculty of Agricultural Sciences and Technologies, Yasar University, İzmir, Türkiye
| | - Karl-Josef Dietz
- Faculty of Biology, Department of Biochemistry and Physiology of Plants, University of Bielefeld, Bielefeld, Germany
| | - Baris Uzilday
- Department of Biology, Faculty of Science, Ege University, Izmir, Türkiye
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Pilarska M, Niewiadomska E, Kruk J. Salinity-induced changes in plastoquinone pool redox state in halophytic Mesembryanthemum crystallinum L. Sci Rep 2023; 13:11160. [PMID: 37430104 DOI: 10.1038/s41598-023-38194-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 07/05/2023] [Indexed: 07/12/2023] Open
Abstract
We have analyzed the effect of salinity on photosystem II (PSII) photochemistry and plastoquinone (PQ) pool in halophytic Mesembryanthemum crystallinum plants. Under prolonged salinity conditions (7 or 10 days of 0.4 M NaCl treatment) we noted an enlarged pool of open PSII reaction centers and increased energy conservation efficiency, as envisaged by parameters of the fast and slow kinetics of chlorophyll a fluorescence. Measurements of oxygen evolution, using 2,6-dichloro-1,4-benzoquinone as an electron acceptor, showed stimulation of the PSII activity due to salinity. In salt-acclimated plants (10 days of NaCl treatment), the improved PSII performance was associated with an increase in the size of the photochemically active PQ pool and the extent of its reduction. This was accompanied by a rise in the NADP+/NADPH ratio. The presented data suggest that a redistribution of PQ molecules between photochemically active and non-active fractions and a change of the redox state of the photochemically active PQ pool indicate and regulate the acclimation of the photosynthetic apparatus to salinity.
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Affiliation(s)
- Maria Pilarska
- The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Kraków, Poland.
| | - Ewa Niewiadomska
- The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Kraków, Poland
| | - Jerzy Kruk
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
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Rawat N, Wungrampha S, Singla-Pareek SL, Yu M, Shabala S, Pareek A. Rewilding staple crops for the lost halophytism: Toward sustainability and profitability of agricultural production systems. MOLECULAR PLANT 2022; 15:45-64. [PMID: 34915209 DOI: 10.1016/j.molp.2021.12.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 06/14/2023]
Abstract
Abiotic stress tolerance has been weakened during the domestication of all major staple crops. Soil salinity is a major environmental constraint that impacts over half of the world population; however, given the increasing reliance on irrigation and the lack of available freshwater, agriculture in the 21st century will increasingly become saline. Therefore, global food security is critically dependent on the ability of plant breeders to create high-yielding staple crop varieties that will incorporate salinity tolerance traits and account for future climate scenarios. Previously, we have argued that the current agricultural practices and reliance on crops that exclude salt from uptake is counterproductive and environmentally unsustainable, and thus called for a need for a major shift in a breeding paradigm to incorporate some halophytic traits that were present in wild relatives but were lost in modern crops during domestication. In this review, we provide a comprehensive physiological and molecular analysis of the key traits conferring crop halophytism, such as vacuolar Na+ sequestration, ROS desensitization, succulence, metabolic photosynthetic switch, and salt deposition in trichomes, and discuss the strategies for incorporating them into elite germplasm, to address a pressing issue of boosting plant salinity tolerance.
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Affiliation(s)
- Nishtha Rawat
- Stress Physiology and Molecular Biology Lab, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Silas Wungrampha
- Stress Physiology and Molecular Biology Lab, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Sneh L Singla-Pareek
- Plant Stress Biology, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Min Yu
- International Research Centre for Environmental Membrane Biology, Foshan University, Foshan 528000, China
| | - Sergey Shabala
- International Research Centre for Environmental Membrane Biology, Foshan University, Foshan 528000, China; Tasmanian Institute for Agriculture, University of Tasmania, Hobart Tas 7001, Australia.
| | - Ashwani Pareek
- Stress Physiology and Molecular Biology Lab, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India; National Agri-Food Biotechnology Institute, Mohali 140306, India.
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Zong JW, Zhang ZL, Huang PL, Chen NY, Xue KX, Tian ZY, Yang YH. Growth, Physiological, and Photosynthetic Responses of Xanthoceras sorbifolium Bunge Seedlings Under Various Degrees of Salinity. FRONTIERS IN PLANT SCIENCE 2021; 12:730737. [PMID: 34646289 PMCID: PMC8504483 DOI: 10.3389/fpls.2021.730737] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 08/23/2021] [Indexed: 06/13/2023]
Abstract
Xanthoceras sorbifolium Bunge is priced for its medical and energetic values. The species also plays a key role in stabilizing ecologically fragile areas exposed to excess soil salinity. In this study, the effects of salinity on the growth, physiological, and photosynthetic parameters of X. sorbifolium Bunge were investigated. The X. sorbifolium seedlings were subjected to five salt treatments: 0 (control, CK), 70, 140, 210, and 280 mM of sodium chloride (NaCl) solutions. NaCl caused a decrease in plant height, specific leaf area, biomass, and root parameters. Leaf wilting and shedding and changes in root morphology, such as root length, root surface area, and root tips were observed. This study found that X. sorbifolium is tolerant to high salinity. Compared with the CK group, even if the concentration of NaCl was higher than 210 mM, the increase of the relative conductivity was also slow, while intercellular CO2 concentration had a similar trend. Moreover, NaCl stress caused an increase in the malondialdehyde (MDA), soluble proteins, and proline. Among the enzymes in the plant, the catalase (CAT) activity increases first and decreased with the increase in the intensity of NaCl stress, but the salt treatment had no significant effect on superoxide dismutase (SOD) activity. The peroxidase (POD) showed an increasing trend under salt stress. It was found that the photosynthesis of X. sorbifolium was notably impacted by saline stress. NaCl toxicity induced a noticeable influence on leaf net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (E), and water use efficiency (Wue). As salt concentration increased, the content of chlorophyll decreased. It can be found that a low concentration of NaCl induced the increase of photosynthetic capacity but a high-intensity exposure to stress resulted in the reduction of photosynthetic efficiency and SOD activity, which had a positive correlation. In summary, salt-induced ionic stress primarily controlled root morphology, osmotic adjustment, and enzyme activities of salt-treated X. sorbifolium leaves, whereas the low salt load could, in fact, promote the growth of roots.
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Schweiger AH, Nürk NM, Beckett H, Liede-Schumann S, Midgley GF, Higgins SI. The eco-evolutionary significance of rainfall constancy for facultative CAM photosynthesis. THE NEW PHYTOLOGIST 2021; 230:1653-1664. [PMID: 33533483 DOI: 10.1111/nph.17250] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
A flexible use of the crassulacean acid metabolism (CAM) has been hypothesised to represent an intermediate stage along a C3 to full CAM evolutionary continuum, when relative contributions of C3 vs CAM metabolism are co-determined by evolutionary history and prevailing environmental constraints. However, evidence for such eco-evolutionary interdependencies is lacking. We studied these interdependencies for the leaf-succulent genus Drosanthemum (Aizoaceae, Southern African Succulent Karoo) by testing for relationships between leaf δ13 C diagnostic for CAM dependence (i.e. contribution of C3 and CAM to net carbon gain), and climatic variables related to temperature and precipitation and their temporal variation. We further quantified the effects of shared phylogenetic ancestry on CAM dependence and its relation to climate. CAM dependence is predicted by rainfall and its temporal variation, with high predictive power of rainfall constancy (temporal entropy). The predictive power of rainfall seasonality and temperature-related variables was negligible. Evolutionary history of the tested clades significantly affected the relationship between rainfall constancy and CAM dependence. We argue that higher CAM dependence might provide an adaptive advantage in increasingly unpredictable rainfall environments when the anatomic exaptation (succulence) is already present. These observations might shed light on the evolution of full CAM.
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Affiliation(s)
- Andreas H Schweiger
- Institute of Landscape and Plant Ecology, Department of Plant Ecology, University of Hohenheim, Ottilie-Zeller-Weg 2, Stuttgart, 70599, Germany
| | - Nicolai M Nürk
- Plant Systematics, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
- Bayreuth Center of Ecology and Environmental Research, BayCEER, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
| | - Heath Beckett
- Department of Botany and Zoology, Stellenbosch University, SUN, Stellenbosch, Western Cape, South Africa
| | - Sigrid Liede-Schumann
- Plant Systematics, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
- Bayreuth Center of Ecology and Environmental Research, BayCEER, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
| | - Guy F Midgley
- Department of Botany and Zoology, Stellenbosch University, SUN, Stellenbosch, Western Cape, South Africa
| | - Steven I Higgins
- Bayreuth Center of Ecology and Environmental Research, BayCEER, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
- Plant Ecology, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95447, Germany
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Wang J, Jiang X, Zhao C, Fang Z, Jiao P. Transcriptomic and metabolomic analysis reveals the role of CoA in the salt tolerance of Zygophyllum spp. BMC PLANT BIOLOGY 2020; 20:9. [PMID: 31906853 PMCID: PMC6945424 DOI: 10.1186/s12870-019-2226-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 12/30/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Zygophyllum is an important medicinal plant, with notable properties such as resistance to salt, alkali, and drought, as well as tolerance of poor soils and shifting sand. However, the response mechanism of Zygophyllum spp. to abiotic stess were rarely studied. RESULTS Here, we aimed to explore the salt-tolerance genes of Zygophyllum plants by transcriptomic and metabolic approaches. We chose Z. brachypterum, Z. obliquum and Z. fabago to screen for salt tolerant and sensitive species. Cytological observation showed that both the stem and leaf of Z. brachypterum were significantly thicker than those of Z. fabago. Then, we treated these three species with different concentrations of NaCl, and found that Z. brachypterum exhibited the highest salt tolerance (ST), while Z. fabago was the most sensitive to salt (SS). With the increase of salt concentration, the CAT, SOD and POD activity, as well as proline and chlorophyll content in SS decreased significantly more than in ST. After salt treatment, the proportion of open stomata in ST decreased significantly more than in SS, although there was no significant difference in stomatal number between the two species. Transcriptomic analysis identified a total of 11 overlapping differentially expressed genes (DEGs) in the leaves and roots of the ST and SS species after salt stress. Two branched-chain-amino-acid aminotransferase (BCAT) genes among the 11 DEGs, which were significantly enriched in pantothenate and CoA biosynthesis, as well as the valine, leucine and isoleucine biosynthesis pathways, were confirmed to be significantly induced by salt stress through qRT-PCR. Furthermore, overlapping differentially abundant metabolites showed that the pantothenate and CoA biosynthesis pathways were significantly enriched after salt stress, which was consistent with the KEGG pathways enriched according to transcriptomics. CONCLUSIONS In our study, transcriptomic and metabolomic analysis revealed that BCAT genes may affect the pantothenate and CoA biosynthesis pathway to regulate the salt tolerance of Zygophyllum species, which may constitute a newly identified signaling pathway through which plants respond to salt stress.
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Affiliation(s)
- Jie Wang
- Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin, Xinjiang Production and Construction Group, Alar, 843300, China
- College of Life Sciences, Tarim University, Alar, 843300, China
- Center of Applied Biotechnology, Wuhan University of Bioengineering, Wuhan, 430415, China
| | - Xi Jiang
- College of Plant Sciences, Tarim University, Alar, 843300, China
| | - Chufeng Zhao
- State Key Laboratory of Hybrid Rice, Engineering Research Center for Plant Biotechnology and Germplasm Utilization of Ministry of Education, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Zhongming Fang
- College of Agricultural Sciences, Guizhou University, Guiyang, 550025, China
| | - Peipei Jiao
- Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin, Xinjiang Production and Construction Group, Alar, 843300, China.
- College of Life Sciences, Tarim University, Alar, 843300, China.
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Matsuoka T, Onozawa A, Sonoike K, Kore-eda S. Crassulacean Acid Metabolism Induction in Mesembryanthemum crystallinum Can Be Estimated by Non-Photochemical Quenching upon Actinic Illumination During the Dark Period. PLANT & CELL PHYSIOLOGY 2018; 59:1966-1975. [PMID: 29917144 PMCID: PMC6178971 DOI: 10.1093/pcp/pcy118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Accepted: 06/08/2018] [Indexed: 05/27/2023]
Abstract
Mesembryanthemum crystallinum, which switches the mode of photosynthesis from C3 to crassulacean acid metabolism (CAM) upon high salt stress, was shown here to exhibit diurnal changes in not only the CO2 fixation pathway but also Chl fluorescence parameters under CAM-induced conditions. We conducted comprehensive time course measurements of M. crystallinum leaf Chl fluorescence using the same leaf throughout the CAM induction period. By doing so, we were able to distinguish the effect of CAM induction from that of photoinhibition and avoid the possible effects of differences in foliar age. We found that the diurnal change in the status of electron transfer could be ascribed to the formation of a proton gradient across thylakoid membranes presumably resulting from diurnal changes in the ATP/ADP ratio reported earlier. The electron transport by actinic illumination thus became limited at the step of plastoquinol oxidation by the Cyt b6/f complex in the 'night' period upon CAM induction, resulting in high levels of non-photochemical quenching. The actinically induced non-photochemical quenching in the 'night' period correlated well with the degree of CAM induction. Chl fluorescence parameters, such as NPQ or qN, could be used as a simple indexing system for the CAM induction.
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Affiliation(s)
- Tatsuya Matsuoka
- Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, Japan
| | - Aya Onozawa
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, Japan
| | - Kintake Sonoike
- Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, Japan
| | - Shin Kore-eda
- Comprehensive Analysis Center for Science, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, Japan
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Montero E, Francisco AM, Montes E, Herrera A. Salinity induction of recycling Crassulacean acid metabolism and salt tolerance in plants of Talinum triangulare. ANNALS OF BOTANY 2018; 121:1333-1342. [PMID: 29596562 PMCID: PMC6007505 DOI: 10.1093/aob/mcy030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 02/17/2018] [Indexed: 05/11/2023]
Abstract
Background and Aims Crassulacean acid metabolism (CAM) can be induced by salinity, thus conferring the plant higher water-use efficiency. Talinum triangulare does not frequently encounter salt in its natural habitat but is cultivated in soils that may become salinized. Here we examined whether plants of T. triangulare can grow in saline soils and show salt-induced CAM. Methods Leaf gas exchange, carbon isotopic ratio (δ13C), nocturnal acid accumulation (ΔH+), water relations, photosynthetic pigment and mineral contents, leaf anatomy and growth were determined in greenhouse in plants irrigated with 0, 150, 300 and 400 mm NaCl. Key Results Salinity reduced gas exchange and induced CAM, ΔH+ reaching 50.2 μmol H+ g-1 fresh mass under 300 mm NaCl. No nocturnal CO2 uptake, but compensation, was observed. Values of δ13C were lowest under 0 and 400 mm NaCl, and highest under 150 and 300 mm. The difference in osmotic potential (ψs) between control and treated plants averaged 0.45 MPa for the three [NaCl] values, the decrease in ψs being accounted for by up to 63 % by Na+ and K+. Pigment contents were unaffected by treatment, suggesting lack of damage to the photosynthetic machinery. Changes in stomatal index with unchanged stomatal density in newly expanded leaves suggested inhibited differentiation of epidermal cells into stomata. Whole-leaf and parenchymata thickness increased under 150 and 300 mm NaCl. Only plants irrigated with 400 mm NaCl showed reductions in biomass (stems, 41 %; reproductive structures, 78 %). The K/Na molar ratio decreased with [NaCl] from 2.0 to 0.4. Conclusions The operation of CAM in the recycling mode was evidenced by increased ΔH+ with no nocturnal CO2 uptake. Talinum triangulare can be classified as a halo-tolerant species based on its low K/Na molar ratio under salinity and the relatively small reduction in growth only at the highest [NaCl].
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Affiliation(s)
- Estefanía Montero
- Centro de Botánica Tropical, Instituto de Biología Experimental, Universidad Central de Venezuela, Caracas, Venezuela
| | - Ana Marta Francisco
- Centro de Ecología, Instituto Venezolano de Investigaciones Científicas, Altos de Pipe, Venezuela
| | - Enrique Montes
- College of Marine Sciences, University of South Florida, St. Petersburg, FL , USA
| | - Ana Herrera
- Centro de Botánica Tropical, Instituto de Biología Experimental, Universidad Central de Venezuela, Caracas, Venezuela
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Carvalho V, Abreu ME, Mercier H, Nievola CC. Adjustments in CAM and enzymatic scavenging of H 2O 2 in juvenile plants of the epiphytic bromeliad Guzmania monostachia as affected by drought and rewatering. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2017; 113:32-39. [PMID: 28161646 DOI: 10.1016/j.plaphy.2017.01.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/20/2016] [Accepted: 01/26/2017] [Indexed: 05/12/2023]
Abstract
Juvenile plants of epiphytes such as bromeliads are highly prone to dehydration under drought conditions. It is likely that young epiphytes evolved mostly metabolic strategies to resist drought, which may include the plastic modulation of the enzymatic antioxidant system and crassulacean acid metabolism (CAM). Few studies have investigated such strategies in juvenile epiphytes, although such research is important to understand how these plants might face drought intensification derived from potential climatic alterations. The epiphytic CAM bromeliad Guzmania monostachia (L.) Rusby ex Mez var. monostachia is known to have plastic responses to drought, but no reports have focused on the metabolism of juvenile plants to drought and recovery. Hence, we aimed to verify how juvenile G. monostachia plants adjust malate (indicative of CAM), H2O2 content and enzymatic scavenging in response to drought (eight days without irrigation) and rewatering (six days of irrigation post-drought). Interestingly, drought decreased H2O2 content and activities of superoxide dismutase, catalase (CAT) and ascorbate peroxidase (APX) in the pre-dusk period, although glutathione reductase (GR) and CAM activity increased. Rewatering restored H2O2, but activities of APX, CAT and GR exceeded pre-stress levels in the pre-dusk and/or pre-dawn periods. Results suggest that recovery from a first drought redefines the homeostatic balance of H2O2 scavenging, in which rewatered plants stimulate the enzymatic antioxidant system while drought-exposed plants intensify CAM activity to regulate H2O2 content, a photosynthetic pathway known to prevent oxidative stress. Such data show that young G. monostachia plants adjust CAM and H2O2 scavenging to adapt to water availability.
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Affiliation(s)
- Victória Carvalho
- Núcleo de Pesquisa em Plantas Ornamentais, Instituto de Botânica SMA/SP, 04301-902, São Paulo, SP, Brazil
| | - Maria E Abreu
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, 05508-900, São Paulo, SP, Brazil
| | - Helenice Mercier
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, 05508-900, São Paulo, SP, Brazil
| | - Catarina C Nievola
- Núcleo de Pesquisa em Plantas Ornamentais, Instituto de Botânica SMA/SP, 04301-902, São Paulo, SP, Brazil.
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Abd El-Gawad AM, Shehata HS. Ecology and development of Mesembryanthemum crystallinum L. in the Deltaic Mediterranean coast of Egypt. EGYPTIAN JOURNAL OF BASIC AND APPLIED SCIENCES 2014; 1:29-37. [DOI: 10.1016/j.ejbas.2014.02.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 01/24/2014] [Accepted: 02/28/2014] [Indexed: 09/02/2023]
Affiliation(s)
| | - Hanaa S. Shehata
- Botany Department, Faculty of Science, Zagazig University, Al-Sharqia, Egypt
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Peckmann K, von Willert DJ, Martin CE, Herppich WB. Mitochondrial respiration in ME-CAM, PEPCK-CAM, and C₃ succulents: comparative operation of the cytochrome, alternative, and rotenone-resistant pathways. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:2909-2919. [PMID: 22330897 DOI: 10.1093/jxb/err458] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Mitochondria are important in the function and control of Crassulacean acid metabolism (CAM) during organic acid accumulation at night and acid decarboxylation in the day. In plants of the malic enzyme-(ME) type and the phosphoenolpyruvate carboxykinase- (PEPCK) type, mitochondria may exert their role in the control of the diurnal rhythm of malic and citric acids to a differential degree. In plants of both CAM types, the oxidative capacity of mitochondria, as well as the activity of CAM-linked mitochondrial enzymes, and of the alternative and the rotenone-resistant pathways of substrate oxidation were compared. Furthermore, a C₃ succulent was included, as well as both C₃ and CAM forms of Mesembryanthemum crystallinum during a salt-induced C₃-to-CAM shift. Mitochondria of PEPCK-type CAM plants exhibited a lower activity of malate oxidation, ratio of malate to succinate oxidation, and activity of mitochondrial NAD-ME. With the exception of Kalanchoë daigremontiana, leaf mitochondria of all other CAM species were highly sensitive to cyanide (80-100%), irrespective of the oxidant used. This indicates that the alternative oxidase is not of general importance in CAM. By contrast, rotenone-insensitive substrate oxidation was very high (50-90%) in all CAM species. This is the first comparison of the rotenone-insensitive pathway of respiration in plants with different CAM-types. The results of this study confirm that mitochondria are involved in the control of CAM to different degrees in the two CAM types, and they highlight the multiple roles of mitochondria in CAM.
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Affiliation(s)
- Klaus Peckmann
- Institut für Ökologie der Pflanzen, Westfälische Wilhelms-Universität, Hindenburgplatz 55, D-48143 Münster, Germany
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Freschi L, Mercier H. Connecting Environmental Stimuli and Crassulacean Acid Metabolism Expression: Phytohormones and Other Signaling Molecules. PROGRESS IN BOTANY 2012. [DOI: 10.1007/978-3-642-22746-2_9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Niewiadomska E, Bilger W, Gruca M, Mulisch M, Miszalski Z, Krupinska K. CAM-related changes in chloroplastic metabolism of Mesembryanthemum crystallinum L. PLANTA 2011; 233:275-85. [PMID: 21046147 PMCID: PMC3026932 DOI: 10.1007/s00425-010-1302-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Accepted: 10/12/2010] [Indexed: 05/18/2023]
Abstract
Crassulacean acid metabolism (CAM) is an intriguing metabolic strategy to maintain photosynthesis under conditions of closed stomata. A shift from C(3) photosynthesis to CAM in Mesembryanthemum crystallinum plants was induced by high salinity (0.4 M NaCl). In CAM-performing plants, the quantum efficiencies of photosystem II and I were observed to undergo distinct diurnal fluctuations that were characterized by a strong decline at the onset of the day, midday recovery, and an evening drop. The temporal recovery of both photosystems' efficiency at midday was associated with a more rapid induction of the electron transport rate at PSII. This recovery of the photosynthetic apparatus at midday was observed to be accompanied by extreme swelling of thylakoids. Despite these fluctuations, a persistent effect of CAM was the acceptor side limitation of PSI during the day, which was accompanied by a strongly decreased level of Rubisco protein. Diurnal changes in the efficiency of photosystems were parallel to corresponding changes in the levels of mRNAs for proteins of PSII and PSI reaction centers and for rbcL, reaching a maximum in CAM plants at midday. This might reflect a high demand for new protein synthesis at this time of the day. Hybridization of run-on transcripts with specific probes for plastid genes of M. crystallinum revealed that the changes in plastidic mRNA levels were regulated at the level of transcription.
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Affiliation(s)
- Ewa Niewiadomska
- Institute of Biology, The Jan Kochanowski University of Humanities and Science, Świętokrzyska 15, 25-406 Kielce, Poland.
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14
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González-Salvatierra C, Luis Andrade J, Escalante-Erosa F, García-Sosa K, Manuel Peña-Rodríguez L. Antioxidant content in two CAM bromeliad species as a response to seasonal light changes in a tropical dry deciduous forest. JOURNAL OF PLANT PHYSIOLOGY 2010; 167:792-799. [PMID: 20097444 DOI: 10.1016/j.jplph.2010.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Revised: 01/06/2010] [Accepted: 01/06/2010] [Indexed: 05/28/2023]
Abstract
Plants have evolved photoprotective mechanisms to limit photodamage; one of these mechanisms involves the biosynthesis of antioxidant metabolites to neutralize reactive oxygen species generated when plants are exposed to excess light. However, it is known that exposure of plants to conditions of extreme water stress and high light intensity results in their enhanced susceptibility to over-excitation of photosystem II and to photooxidative stress. In this investigation we used the 2,2-diphenyl-1-picrylhydrazyl reduction assay to conduct a broad survey of the effect of water availability and light exposure conditions on the antioxidant activity of the leaf extracts of two bromeliad species showing crassulacean acid metabolism. One of these was an epiphyte, Tillandsia brachycaulos, and the other a terrestrial species, Bromelia karatas. Both species were found growing wild in the tropical dry deciduous forest of Dzibilchaltún National Park, México. The microenvironment of T. brachycaulos and B. karatas experiences significant diurnal and seasonal light variations as well as changes in temperature and water availability. The results obtained showed that, for both bromeliads, increases in antioxidant activity occurred during the dry season, as a consequence of water stress and higher light conditions. Additionally, in T. brachycaulos there was a clear correlation between high light intensity conditions and the content of anthocyanins which accumulated below the leaf epidermis. This result suggests that the role of these pigments is as photoprotective screens in the leaves. The red coloration below the leaf epidermis of B. karatas was not due to anthocyanins but to other unidentified pigments.
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Affiliation(s)
- Claudia González-Salvatierra
- Unidad de Recursos Naturales, Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Col. Chuburná, Mérida, Yucatán 97200, México
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15
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Niewiadomska E, Miszalski Z. Partial characterization and expression of leaf catalase in the CAM-inducible halophyte Mesembryanthemum crystallinum L. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2008; 46:421-427. [PMID: 18203610 DOI: 10.1016/j.plaphy.2007.09.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Indexed: 05/25/2023]
Abstract
Catalase (CAT; EC 1.11.1.6) isolated from leaves of the halophytic plant Mesembryanthemum crystallinum is characterized by a high apparent molecular mass of about 320kDa, and high resistance to denaturing agents (10% ME). SDS-treatment breaks active oligomeric CAT into the less active and putatively dimeric form of 160kDa apparent molecular mass. Three subunits are resolved after denaturing PAGE: 79, 74 and 62kDa. Higher molecular masses of subunits coincide with increased activity of CAT. M. crystallinum leaf CAT reveals a diel variation in the resistance to denaturing factors and the stability of CAT is increased in a light-dependent manner both in C(3)- and in CAM-induced plants. Unchanged level of leaf CAT transcripts is documented in the diurnal cycle of C(3) plants and after salinity-induced crassulacean acid metabolism (CAM).
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Affiliation(s)
- Ewa Niewiadomska
- Institute of Plant Physiology, Polish Academy of Sciences, Krakow, Poland.
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16
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Slesak I, Slesak H, Libik M, Miszalski Z. Antioxidant response system in the short-term post-wounding effect in Mesembryanthemum crystallinum leaves. JOURNAL OF PLANT PHYSIOLOGY 2008; 165:127-37. [PMID: 17928099 DOI: 10.1016/j.jplph.2007.03.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2006] [Revised: 02/26/2007] [Accepted: 03/02/2007] [Indexed: 05/08/2023]
Abstract
Mechanical wounding of Mesembryanthemum crystallinum leaves in planta induced a fast decrease in stomatal conductance, which was related to accumulation of hydrogen peroxide (H(2)O(2)). Higher levels of H(2)O(2) were accompanied by an increase in total activity of superoxide dismutase (SOD) and a decrease in catalase (CAT) activity. Among SOD forms, manganese SOD (MnSOD) and copper/zinc SOD (Cu/ZnSOD) seem to be especially important sources of H(2)O(2) at early stages of wounding response. Moreover, NADP-malic enzyme (NADP-ME), one of the key enzymes of primary carbon metabolism, which is also involved in stress responses, showed a strong increase in activity in wounded leaves. All these symptoms: high accumulation of H(2)O(2), high activities of Cu/ZnSOD and NADP-ME, together with the decrease of CAT activity, were also observed in the major veins of unwounded leaves. The potential role of veinal tissues as an important source of H(2)O(2) during wounding response is discussed.
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Affiliation(s)
- Ireneusz Slesak
- Institute of Plant Physiology, Polish Academy of Sciences, ul. Niezapominajek 21, 30-239 Kraków, Poland.
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Niewiadomska E, Borland AM. Crassulacean Acid Metabolism: a Cause or Consequence of Oxidative Stress in Planta? PROGRESS IN BOTANY 2008. [DOI: 10.1007/978-3-540-72954-9_10] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Winter K, Holtum JAM. Environment or development? Lifetime net CO2 exchange and control of the expression of Crassulacean acid metabolism in Mesembryanthemum crystallinum. PLANT PHYSIOLOGY 2007; 143:98-107. [PMID: 17056756 PMCID: PMC1761986 DOI: 10.1104/pp.106.088922] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2006] [Accepted: 10/09/2006] [Indexed: 05/12/2023]
Abstract
The relative influence of plant age and environmental stress signals in triggering a shift from C(3) photosynthesis to Crassulacean acid metabolism (CAM) in the annual halophytic C(3)-CAM species Mesembryanthemum crystallinum was explored by continuously monitoring net CO(2) exchange of whole shoots from the seedling stage until seed set. Plants exposed to high salinity (400 mm NaCl) in hydroponic culture solution or grown in saline-droughted soil acquired between 11% and 24% of their carbon via net dark CO(2) uptake involving CAM. In contrast, plants grown under nonsaline, well-watered conditions were capable of completing their life cycle by operating in the C(3) mode without ever exhibiting net CO(2) uptake at night. These observations are not consistent with the widely expressed view that the induction of CAM by high salinity in M. crystallinum represents an acceleration of preprogrammed developmental processes. Rather, our study demonstrates that the induction of the CAM pathway for carbon acquisition in M. crystallinum is under environmental control.
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Affiliation(s)
- Klaus Winter
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama.
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