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Hundacker J, Bittner N, Weise C, Bröhan G, Varama M, Hilker M. Pine defense against eggs of an herbivorous sawfly is elicited by an annexin-like protein present in egg-associated secretion. PLANT, CELL & ENVIRONMENT 2022; 45:1033-1048. [PMID: 34713898 DOI: 10.1111/pce.14211] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 10/18/2021] [Accepted: 10/18/2021] [Indexed: 06/13/2023]
Abstract
Known elicitors of plant defenses against eggs of herbivorous insects are low-molecular-weight organic compounds associated with the eggs. However, previous studies provided evidence that also proteinaceous compounds present in secretion associated with eggs of the herbivorous sawfly Diprion pini can elicit defensive responses in Pinus sylvestris. Pine responses induced by the proteinaceous secretion are known to result in enhanced emission of (E)-β-farnesene, which attracts egg parasitoids killing the eggs. Here, we aimed to identify the defense-eliciting protein and elucidate its function. After isolating the defense-eliciting protein from D. pini egg-associated secretion by ultrafiltration and gel electrophoresis, we identified it by MALDI-TOF mass spectrometry as an annexin-like protein, which we named 'diprionin'. Further GC-MS analyses showed that pine needles treated with heterologously expressed diprionin released enhanced quantities of (E)-β-farnesene. Our bioassays confirmed attractiveness of diprionin-treated pine to egg parasitoids. Expression of several pine candidate genes involved in terpene biosynthesis and regulation of ROS homeostasis was similarly affected by diprionin and natural sawfly egg deposition. However, the two treatments had different effects on expression of pathogenesis-related genes (PR1, PR5). Diprionin is the first egg-associated proteinaceous elicitor of indirect plant defense against insect eggs described so far.
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Affiliation(s)
- Janik Hundacker
- Department of Applied Zoology and Animal Ecology, Freie Universität Berlin, Dahlem Centre of Plant Sciences, Institute of Biology, Berlin, Germany
| | - Norbert Bittner
- Department of Applied Zoology and Animal Ecology, Freie Universität Berlin, Dahlem Centre of Plant Sciences, Institute of Biology, Berlin, Germany
| | - Christoph Weise
- Department of Biochemistry, Freie Universität Berlin, Institute of Chemistry and Biochemistry, Berlin, Germany
| | - Gunnar Bröhan
- Department of Applied Zoology and Animal Ecology, Freie Universität Berlin, Dahlem Centre of Plant Sciences, Institute of Biology, Berlin, Germany
| | - Martti Varama
- Natural Resources Institute Finland, Helsinki, Finland
| | - Monika Hilker
- Department of Applied Zoology and Animal Ecology, Freie Universität Berlin, Dahlem Centre of Plant Sciences, Institute of Biology, Berlin, Germany
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2
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Mohammad A, Saini RV, Kumar R, Sharma D, Saini NK, Gupta A, Thakur P, Winterbourn CC, Saini AK. A curious case of cysteines in human peroxiredoxin I. Redox Biol 2020; 37:101738. [PMID: 33011678 PMCID: PMC7530344 DOI: 10.1016/j.redox.2020.101738] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/08/2020] [Accepted: 09/19/2020] [Indexed: 01/06/2023] Open
Abstract
Peroxiredoxins (Prxs) are antioxidant proteins that are involved in cellular defence against reactive oxygen species and reactive nitrogen species. Humans have six peroxiredoxins, hPrxI-VI, out of which hPrxI and hPrxII belongs to the typical 2-Cys class sharing 90% conservation in their amino acid sequence including catalytic residues required to carry out their peroxidase and chaperone activities. Despite the high conservation between hPrxI and hPrxII, hPrxI behaves differently from hPrxII in its peroxidase and chaperone activity. We recently showed in yeast that in the absence of Tsa1 and Tsa2 (orthologs of hPrx) hPrxI protects the cells against different stressors whereas hPrxII does not. To understand this difference, we expressed catalytic mutants of hPrxI in yeast cells lacking the orthologs of hPrxI/II. We found that the catalytic mutants lacking peroxidase function including hPrxIC52S, hPrxIC173S, hPrxIT49A, hPrxIP45A and hPrxIR128A were not able to grow on media with nitrosative stressor (sodium nitroprusside) and unable to withstand heat stress, but surprisingly they were able to grow on an oxidative stressor (H2O2). Interestingly, we found that hPrxI increases the expression of antioxidant genes, GPX1 and SOD1, and this is also seen in the case of a catalytic mutant, indicating hPrxI can indirectly reduce oxidative stress independently of its own peroxidase function and thus suggesting a novel role of hPrxI in altering the expression of other antioxidant genes. Furthermore, hPrxIC83T was resistant to hyperoxidation and formation of stable high molecular weight oligomers, which is suggestive of impaired chaperone activity. Our results suggest that the catalytic residues of hPrxI are essential to counter the nitrosative stress whereas Cys83 in hPrxI plays a critical role in hyperoxidation of hPrxI.
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Affiliation(s)
- Ashu Mohammad
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India; Faculty of Applied Science and Biotechnology, Shoolini University, Solan, 173229, India
| | - Reena V Saini
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Rakesh Kumar
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Deepak Sharma
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Neeraj K Saini
- Department of Biotechnology, Jawaharlal Nehru University, Delhi, 110067, India
| | - Arpit Gupta
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Priyanka Thakur
- Faculty of Sciences, Shoolini University, Solan, 173229, India
| | - Christine C Winterbourn
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - Adesh K Saini
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India; Maharishi Markandeshwar (Deemed to Be University), Solan, HP, 173212, India.
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3
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Genome-wide characterization of ALDH Superfamily in Brassica rapa and enhancement of stress tolerance in heterologous hosts by BrALDH7B2 expression. Sci Rep 2019; 9:7012. [PMID: 31065035 PMCID: PMC6505040 DOI: 10.1038/s41598-019-43332-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 04/22/2019] [Indexed: 12/17/2022] Open
Abstract
Aldehyde dehydrogenase (ALDH) carries out oxidation of toxic aldehydes using NAD+/NADP+ as cofactors. In the present study, we performed a genome-wide identification and expression analysis of genes in the ALDH gene family in Brassica rapa. A total of 23 ALDH genes in the superfamily have been identified according to the classification of ALDH Gene Nomenclature Committee (AGNC). They were distributed unevenly across all 10 chromosomes. All the 23 Brassica rapa ALDH (BrALDH) genes exhibited varied expression patterns during treatments with abiotic stress inducers and hormonal treatments. The relative expression profiles of ALDH genes in B. rapa showed that they are predominantly expressed in leaves and stem suggesting their function in the vegetative tissues. BrALDH7B2 showed a strong response to abiotic stress and hormonal treatments as compared to other ALDH genes; therefore, it was overexpressed in heterologous hosts, E. coli and yeast to study its possible function under abiotic stress conditions. Over-expression of BrALDH7B2 in heterologous systems, E. coli and yeast cells conferred significant tolerance to abiotic stress treatments. Results from this work demonstrate that BrALDH genes are a promising and untapped genetic resource for crop improvement and could be deployed further in the development of drought and salinity tolerance in B. rapa and other economically important crops.
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Ahmed I, Yadav D, Shukla P, Kirti PB. Heterologous expression of Brassica juncea annexin, AnnBj2 confers salt tolerance and ABA insensitivity in transgenic tobacco seedlings. Funct Integr Genomics 2018; 18:569-579. [PMID: 29744759 DOI: 10.1007/s10142-018-0614-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 04/29/2018] [Accepted: 05/02/2018] [Indexed: 01/05/2023]
Abstract
Annexins are multifunctional proteins with roles in plant development and alleviation of stress tolerance. In the present communication, we report on the effect of heterologous expression of Brassica juncea annexin, AnnBj2 in tobacco. Transgenic tobacco plants expressing AnnBj2 exhibited salt-tolerant and abscisic acid (ABA)-insensitive phenotype at the seedling stage. Biochemical analysis showed that AnnBj2 transgenic plants retained higher chlorophyll and proline content, and lower malondialdehyde (MDA) levels compared to the null line under salt stress. They exhibited better water retention capacity compared to the null segregant (NS) line. AnnBj2 overexpression altered the transcript levels of several stress-related marker genes involved in reactive oxygen species (ROS) scavenging and abiotic stress signaling. Taken together, these results suggest a positive role for AnnBj2 in salt stress response upon heterologous expression in tobacco.
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Affiliation(s)
- Israr Ahmed
- Lab F-43, Department of Plant Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India.
| | - Deepanker Yadav
- Lab F-43, Department of Plant Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India
- Department of Fruit Tree Sciences, Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, 7505101, Rishon LeZion, Israel
| | - Pawan Shukla
- Lab F-43, Department of Plant Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India
- Central Sericultural Research and Training Institute, Central Silk Board, NH-1A, Gallandar, Pampore, Jammu and Kashmir, 192 121, India
| | - P B Kirti
- Lab F-43, Department of Plant Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India.
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Ahmed I, Yadav D, Shukla P, Vineeth TV, Sharma PC, Kirti PB. Constitutive expression of Brassica juncea annexin, AnnBj2 confers salt tolerance and glucose and ABA insensitivity in mustard transgenic plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2017; 265:12-28. [PMID: 29223333 DOI: 10.1016/j.plantsci.2017.09.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/09/2017] [Accepted: 09/16/2017] [Indexed: 05/20/2023]
Abstract
Annexins belong to a plasma membrane binding (in a calcium dependent manner), multi-gene family of proteins, which play ameliorating roles in biotic and abiotic stresses. The expression of annexin AnnBj2 of Indian mustard is tissue specific with higher expression in roots and under treatments with sodium chloride and abscisic acid (ABA) at seedling stage. The effect of constitutive expression of AnnBj2 in mustard was analyzed in detail. AnnBj2 OE (over expression) plants exhibited insensitivity to ABA, glucose and sodium chloride. The insensitivity/tolerance of the transgenic plants was associated with enhanced total chlorophylls, relative water content, proline, calcium and potassium with reduced thiobarbituric acid reactive substances and sodium ion accumulation. The altered ABA insensitivity of AnnBj2 OE lines is linked to downregulation of ABI4 and ABI5 transcription factors and upregulation of ABA catabolic gene CYP707A2. Furthermore, we found that overexpression of AnnBj2 upregulated the expression of ABA-dependent RAB18 and ABA-independent DREB2B stress marker genes suggesting that the tolerance phenotype exhibited by AnnBj2 OE lines is probably controlled by both ABA-dependent and -independent mechanisms.
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Affiliation(s)
- Israr Ahmed
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India.
| | - Deepanker Yadav
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India
| | - Pawan Shukla
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India
| | - T V Vineeth
- Central Soil Salinity Research Institute, Karnal, Haryana, India
| | - P C Sharma
- Central Soil Salinity Research Institute, Karnal, Haryana, India
| | - P B Kirti
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India.
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Zhang Y, Li H, Wang Y, Wei J. The calcium-binding protein EpANN from the lichenized fungus Endocarpon pusillum enhances stress tolerance in yeast and plants. Fungal Genet Biol 2017; 108:36-43. [PMID: 28927934 DOI: 10.1016/j.fgb.2017.09.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 09/11/2017] [Accepted: 09/15/2017] [Indexed: 11/25/2022]
Abstract
Annexins are calcium-phospholipid binding proteins that play a significant role in the Ca2+signaling pathway. These proteins are essential for plants to effectively respond to abiotic stresses. However, their functions and mechanisms remain largely unknown in fungi. In this study, an annexin gene, Epann, was cloned from the lichenized fungus Endocarpon pusillum, a drought resistant organism. Our results showed that Epann was induced by several abiotic stresses in E. pusillum. Heterologous expression of the Epann gene enhanced the stress tolerance of Saccharomyces cerevisiae. Under heat-shock conditions, the EpANN proteins were significantly aggregated and the aggregation sites were located on peroxisomes. In heat-shocked cells, Epann reduced the reactive oxygen species level mainly through its intracellular peroxidase activity and regulation of stress-related genes. Transgenic Arabidopsis plants overexpressing Epann exhibited a higher germination rate under oxidative stress and stronger drought tolerance. Our results provide a mechanistic understanding of the role of annexins in abiotic stress responses and suggest that this lichenized fungal gene could be a promising resource to generate stress-tolerant transgenic organisms.
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Affiliation(s)
- Yongli Zhang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 10010, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Hui Li
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 10010, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Yanyan Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 10010, PR China.
| | - Jiangchun Wei
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 10010, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
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Konopka-Postupolska D, Clark G. Annexins as Overlooked Regulators of Membrane Trafficking in Plant Cells. Int J Mol Sci 2017; 18:E863. [PMID: 28422051 PMCID: PMC5412444 DOI: 10.3390/ijms18040863] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 04/03/2017] [Accepted: 04/06/2017] [Indexed: 12/11/2022] Open
Abstract
Annexins are an evolutionary conserved superfamily of proteins able to bind membrane phospholipids in a calcium-dependent manner. Their physiological roles are still being intensively examined and it seems that, despite their general structural similarity, individual proteins are specialized toward specific functions. However, due to their general ability to coordinate membranes in a calcium-sensitive fashion they are thought to participate in membrane flow. In this review, we present a summary of the current understanding of cellular transport in plant cells and consider the possible roles of annexins in different stages of vesicular transport.
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Affiliation(s)
- Dorota Konopka-Postupolska
- Plant Biochemistry Department, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw 02-106, Poland.
| | - Greg Clark
- Molecular, Cell, and Developmental Biology, University of Texas, Austin, TX 78712, USA.
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Huang GD, Zhong XF, Deng ZY, Zeng R. Proteomic analysis of ginsenoside Re attenuates hydrogen peroxide-induced oxidative stress in human umbilical vein endothelial cells. Food Funct 2016; 7:2451-61. [PMID: 27161858 DOI: 10.1039/c6fo00123h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ginsenoside Re is an active component in ginseng that has attracted much attention because of its evident therapeutic effects on the cardiovascular system. However, little basic information is available on the mechanisms and pharmacological effects of ginsenoside Re. The potential mechanisms and protective effects of Re on H2O2-induced oxidative injury in human umbilical vein endothelial cells (HUVECs) were investigated in this study. An oxidative injury model was established using H2O2. The anti-oxidative effects of Re were determined using a series of experiments, such as MTT and anti-oxidative indicator assays. The potential protective mechanisms of Re were explored at the proteomic level, and differentially expressed proteins were validated by quantitative real-time polymerase chain reaction and western blotting. Results indicated that Re could be a potential anti-oxidant to protect HUVECs against oxidative stress damage. Proteomic analysis showed that the expression of 23 protein spots was upregulated in Re and H2O2 groups to resist oxidative stress, 15 of which were identified by their mass spectrum. These upregulated proteins were involved in stress response, anti-oxidative systems, protein synthesis, regulation of transcription and post-translational modifications, and repair of mitochondrial functions. This study may provide new insights into the mechanisms of ginsenoside Re in protecting the cardiovascular system.
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Affiliation(s)
- Gui-Dong Huang
- Department of Food Science, Foshan University, Foshan 528231, China.
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Vishwakarma A, Dalal A, Tetali SD, Kirti PB, Padmasree K. Genetic engineering of AtAOX1a in Saccharomyces cerevisiae prevents oxidative damage and maintains redox homeostasis. FEBS Open Bio 2016; 6:135-46. [PMID: 27239435 PMCID: PMC4821348 DOI: 10.1002/2211-5463.12028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 12/31/2015] [Accepted: 12/31/2015] [Indexed: 02/02/2023] Open
Abstract
This study aimed to validate the physiological importance of Arabidopsis thaliana alternative oxidase 1a (AtAOX1a) in alleviating oxidative stress using Saccharomyces cerevisiae as a model organism. The AOX1a transformant (pYES2AtAOX1a) showed cyanide resistant and salicylhydroxamic acid (SHAM)‐sensitive respiration, indicating functional expression of AtAOX1a in S. cerevisiae. After exposure to oxidative stress, pYES2AtAOX1a showed better survival and a decrease in reactive oxygen species (ROS) when compared to S. cerevisiae with empty vector (pYES2). Furthermore, pYES2AtAOX1a sustained growth by regulating GPX2 and/or TSA2, and cellular NAD+/NADH ratio. Thus, the expression of AtAOX1a in S. cerevisiae enhances its respiratory tolerance which, in turn, maintains cellular redox homeostasis and protects from oxidative damage.
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Affiliation(s)
- Abhaypratap Vishwakarma
- Department of Plant Sciences School of Life Sciences University of Hyderabad Hyderabad India
| | - Ahan Dalal
- Department of Plant Sciences School of Life Sciences University of Hyderabad Hyderabad India
| | - Sarada Devi Tetali
- Department of Plant Sciences School of Life Sciences University of Hyderabad Hyderabad India
| | | | - Kollipara Padmasree
- Department of Biotechnology and Bioinformatics School of Life Sciences University of Hyderabad Hyderabad India
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Dietz KJ. Thiol-Based Peroxidases and Ascorbate Peroxidases: Why Plants Rely on Multiple Peroxidase Systems in the Photosynthesizing Chloroplast? Mol Cells 2016; 39:20-5. [PMID: 26810073 PMCID: PMC4749869 DOI: 10.14348/molcells.2016.2324] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/23/2015] [Indexed: 11/27/2022] Open
Abstract
Photosynthesis is a highly robust process allowing for rapid adjustment to changing environmental conditions. The efficient acclimation depends on balanced redox metabolism and control of reactive oxygen species release which triggers signaling cascades and potentially detrimental oxidation reactions. Thiol peroxidases of the peroxiredoxin and glutathione peroxidase type, and ascorbate peroxidases are the main peroxide detoxifying enzymes of the chloroplast. They use different electron donors and are linked to distinct redox networks. In addition, the peroxiredoxins serve functions in redox regulation and retrograde signaling. The complexity of plastid peroxidases is discussed in context of suborganellar localization, substrate preference, metabolic coupling, protein abundance, activity regulation, interactions, signaling functions, and the conditional requirement for high antioxidant capacity. Thus the review provides an opinion on the advantage of linking detoxification of peroxides to different enzymatic systems and implementing mechanisms for their inactivation to enforce signal propagation within and from the chloroplast.
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Affiliation(s)
- Karl-Josef Dietz
- Biochemistry and Physiology of Plants, Faculty of Biology, W5-134, Bielefeld University, University Street 25, 33501 Bielefeld,
Germany
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Szalonek M, Sierpien B, Rymaszewski W, Gieczewska K, Garstka M, Lichocka M, Sass L, Paul K, Vass I, Vankova R, Dobrev P, Szczesny P, Marczewski W, Krusiewicz D, Strzelczyk-Zyta D, Hennig J, Konopka-Postupolska D. Potato Annexin STANN1 Promotes Drought Tolerance and Mitigates Light Stress in Transgenic Solanum tuberosum L. Plants. PLoS One 2015; 10:e0132683. [PMID: 26172952 PMCID: PMC4501783 DOI: 10.1371/journal.pone.0132683] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 06/18/2015] [Indexed: 11/18/2022] Open
Abstract
Annexins are a family of calcium- and membrane-binding proteins that are important for plant tolerance to adverse environmental conditions. Annexins function to counteract oxidative stress, maintain cell redox homeostasis, and enhance drought tolerance. In the present study, an endogenous annexin, STANN1, was overexpressed to determine whether crop yields could be improved in potato (Solanum tuberosum L.) during drought. Nine potential potato annexins were identified and their expression characterized in response to drought treatment. STANN1 mRNA was constitutively expressed at a high level and drought treatment strongly increased transcription levels. Therefore, STANN1 was selected for overexpression analysis. Under drought conditions, transgenic potato plants ectopically expressing STANN1 were more tolerant to water deficit in the root zone, preserved more water in green tissues, maintained chloroplast functions, and had higher accumulation of chlorophyll b and xanthophylls (especially zeaxanthin) than wild type (WT). Drought-induced reductions in the maximum efficiency and the electron transport rate of photosystem II (PSII), as well as the quantum yield of photosynthesis, were less pronounced in transgenic plants overexpressing STANN1 than in the WT. This conferred more efficient non-photochemical energy dissipation in the outer antennae of PSII and probably more efficient protection of reaction centers against photooxidative damage in transgenic plants under drought conditions. Consequently, these plants were able to maintain effective photosynthesis during drought, which resulted in greater productivity than WT plants despite water scarcity. Although the mechanisms underlying this stress protection are not yet clear, annexin-mediated photoprotection is probably linked to protection against light-induced oxidative stress.
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Affiliation(s)
- Michal Szalonek
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | - Barbara Sierpien
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | - Wojciech Rymaszewski
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | | | - Maciej Garstka
- Department of Metabolic Regulation, University of Warsaw, Warsaw, Poland
| | - Malgorzata Lichocka
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | - Laszlo Sass
- Laboratory of Molecular Stress and Photobiology, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Kenny Paul
- Laboratory of Molecular Stress and Photobiology, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Imre Vass
- Laboratory of Molecular Stress and Photobiology, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Radomira Vankova
- Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany AS CR, Praha, Czech Republic
| | - Peter Dobrev
- Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany AS CR, Praha, Czech Republic
| | - Pawel Szczesny
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | - Waldemar Marczewski
- Department of Potato Genetics and Parental Lines, Plant Breeding and Acclimatization Institute—National Research Institute, Mlochow, Poland
| | - Dominika Krusiewicz
- Department of Potato Genetics and Parental Lines, Plant Breeding and Acclimatization Institute—National Research Institute, Mlochow, Poland
| | - Danuta Strzelczyk-Zyta
- Department of Potato Genetics and Parental Lines, Plant Breeding and Acclimatization Institute—National Research Institute, Mlochow, Poland
| | - Jacek Hennig
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
| | - Dorota Konopka-Postupolska
- Plant Pathogenesis Lab, Institute of Biochemistry and Biophysics Polish Academy of Science, Warsaw, Poland
- * E-mail:
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