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Bykova NV, Igamberdiev AU. Redox Control of Seed Germination is Mediated by the Crosstalk of Nitric Oxide and Reactive Oxygen Species. Antioxid Redox Signal 2025; 42:442-461. [PMID: 39602281 DOI: 10.1089/ars.2024.0699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2024]
Abstract
Significance: Seed germination and seedling establishment are characterized by changes in the intracellular redox state modulated by accelerated production of nitric oxide (NO) and reactive oxygen species (ROS). Redox regulation and enhanced accumulation of NO and ROS, approaching excessively high levels during seed imbibition, are critically important for breaking endodormancy and inducing germination. Recent Advances: Upon depletion of oxygen under the seed coat, NO is produced anaerobically in the reductive pathway associated mainly with mitochondria, and it participates in the energy metabolism of the seed until radicle protrusion. NO turnover involves nitrate reduction to nitrite in the cytosol, nitrite reduction to NO in mitochondria, and NO oxygenation in the cytosol in the reaction involving the hypoxically induced class 1 phytoglobin. In postgerminative degradation of seed tissues, NO and ROS are involved in redox signaling via post-translational modification of proteins and mediation of phytohormonal responses. Critical Issues: The crosstalk between the cellular redox potential, NO, ROS, and phytohormones integrates major physiological processes related to seed germination. Intensive accumulation of NO and ROS during imbibition is critically important for breaking seed dormancy. Upon oxygen depletion, NO and other nitrous oxides (NOx) are produced anaerobically and support energy metabolism prior to radicle protrusion. Future Directions: The turnover of NOx and ROS is determined by the intracellular redox balance, and it self-controls redox and energy levels upon germination. The particular details, regulation of this process, and its physiological significance remain to be established. Antioxid. Redox Signal. 42, 442-461.
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Affiliation(s)
- Natalia V Bykova
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, Morden, Canada
| | - Abir U Igamberdiev
- Department of Biology, Memorial University of Newfoundland, St. John's, Canada
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Boanares D, Cardoso AF, Escobar DFE, Costa KJA, Bitencourt JA, Costa PHO, Ramos S, Gastauer M, Caldeira CF. The Impact of Rhizospheric and Endophytic Bacteria on the Germination of Carajasia cangae: A Threatened Rubiaceae of the Amazon Cangas. Microorganisms 2024; 12:1843. [PMID: 39338517 PMCID: PMC11433783 DOI: 10.3390/microorganisms12091843] [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: 07/30/2024] [Revised: 08/26/2024] [Accepted: 08/27/2024] [Indexed: 09/30/2024] Open
Abstract
Carajasia cangae (Rubiaceae) is a narrow endemic species from the canga ecosystems of the Carajás National Forest that is facing extinction due to a limited range and habitat disturbance from hydroclimatological changes and mining activities. This study examines the influence of rhizospheric and endophytic bacteria on C. cangae seed germination to support conservation efforts. Soil samples, both rhizospheric and non-rhizospheric, as well as plant root tissues, were collected. Bacteria from these samples were subsequently isolated, cultured, and identified. DNA sequencing revealed the presence of 16 isolates (9 rhizospheric and 7 endophytic), representing 19 genera and 6 phyla: Proteobacteria, Actinobacteria, Acidobacteria, Firmicutes, Bacteroidetes, and Chloroflexi. The endophytic isolates of Bacillus and the rhizospheric isolates of Planococcus and Lysinibacillus reduced the median germination time and initiation time, while the rhizospheric isolates Serratia and Comamonas increased the germination time and decreased the germination percentage in comparison to the control sample. These findings emphasize the crucial role of endophytic bacteria in the germination of C. cangae and highlight isolates that could have beneficial effects in the following stages of plant growth. Understanding the impact of endophytic and rhizospheric bacterial isolates on seed germination can enhance conservation efforts by shortening the germination period of this species and thereby improving seedling production. Additionally, this knowledge will pave the way for future research on the role of bacteria in the establishment of C. cangae.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Cecilio Frois Caldeira
- Instituto Tecnológico Vale, Belém 66055-090, PA, Brazil; (D.B.); (A.F.C.); (D.F.E.E.); (K.J.A.C.); (J.A.B.); (P.H.O.C.); (S.R.); (M.G.)
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Vigliocco A, Del Bel Z, Pérez-Chaca MV, Molina A, Zirulnik F, Andrade AM, Alemano S. Spatiotemporal variations in salicylic acid and hydrogen peroxide in sunflower seeds during transition from dormancy to germination. PHYSIOLOGIA PLANTARUM 2020; 169:27-39. [PMID: 31670838 DOI: 10.1111/ppl.13043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/17/2019] [Accepted: 10/28/2019] [Indexed: 06/10/2023]
Abstract
Phytohormones and reactive oxygen species mediate processes such as germination and dormancy. The elucidation of the physiological and biochemical events implicated in the transition from dormancy to germination in different plant species such as sunflower becomes a topic of interest. In this study, we investigated the spatiotemporal variation of salicylic acid (SA), hydrogen peroxide (H2 O2 ) and the activity of two antioxidant enzymes (catalase, CAT - EC 1.11.1.6 and ascorbate peroxidase - EC 1.11.1.11) in embryonic axis and cotyledons of dry and imbibed seeds of dormant (B123) and non-dormant (B91) sunflower lines. The results showed that embryonic axis had higher level of SA and H2 O2 than cotyledons in both lines. In dry seeds, B123 embryo (embryonic axis + cotyledons) showed a higher SA content than B91. After dry storage at room temperature, SA decreased in B123 embryos to a value close to that registered in B91 embryos. B123 embryonic axis of dry seeds presented higher H2 O2 levels than B91. Dry storage led to an increase of H2 O2 levels and a decrease of CAT activity in B123 embryonic axis. During imbibition, B123 seeds stored for 33 days displayed an increase in SA level in the embryonic axis (3 h of imbibition) and this lower level correlated with a decrease in H2 O2 (6 h of imbibition). Thus, the embryo-imposed dormancy in B123 dry seeds was associated with high levels of SA and low H2 O2 , whereas the dormancy release was linked with SA decrease and increase of H2 O2 as a consequence of lower CAT activity.
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Affiliation(s)
- Ana Vigliocco
- Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, INIAB-CONICET, Rio Cuarto, Argentina
| | - Zoé Del Bel
- Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, INIAB-CONICET, Rio Cuarto, Argentina
| | - María Verónica Pérez-Chaca
- Departamento de Bioquímica y Ciencias Biológicas, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina
| | - Alicia Molina
- Departamento de Bioquímica y Ciencias Biológicas, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina
| | - Fanny Zirulnik
- Departamento de Bioquímica y Ciencias Biológicas, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina
| | - Andrea María Andrade
- Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, INIAB-CONICET, Rio Cuarto, Argentina
| | - Sergio Alemano
- Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, INIAB-CONICET, Rio Cuarto, Argentina
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Overexpression of BnaAOX1b Confers Tolerance to Osmotic and Salt Stress in Rapeseed. G3-GENES GENOMES GENETICS 2019; 9:3501-3511. [PMID: 31484671 PMCID: PMC6778779 DOI: 10.1534/g3.119.400366] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alternative oxidases (AOXs) are the terminal oxidase in the cyanide-resistant respiration pathway in plant mitochondria, which play an important role in abiotic stress and are proposed as a functional marker for high tolerant breeding. In this study, ten AOX genes (BnaAOXs) were identified, and CysI and CysII of AOX isoforms were highly conserved in rapeseed. Among them, Bna.AOX1b was mainly expressed in the ovule and displayed varying expression between rapeseed cultivars which showed different salt resistance in seed germination. We identified its mitochondrial localization of this gene. To investigate the function of BnaAOX1b in rapeseed, transgenic rapeseed lines with overexpressed BnaAOX1b were created and seed germination and seedling establishment assays were performed under osmotic, salt, and ABA treatment. The results indicated that overexpression of BnaAOX1b significantly improved seed germination under osmotic and salt stress and weakened ABA sensitivity. In addition, post-germination seedling growth was improved under high salt condition, but showed hypersensitivity to ABA. RNA-sequencing analysis indicated that the genes involved in electron transport or energy pathway were induced and a number of gene responses to salt stress and ABA were regulated in Bna.AOX1b overexpressing seeds. Taken together, our results imply that Bna.AOX1b confers tolerance to osmotic and salt stress in terms of seed germination and seedling establishment by regulating stress responsive genes and the response to ABA, and could be utilized as a candidate gene in transgenic breeding.
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Mutagen-induced phytotoxicity in maize seed germination is dependent on ROS scavenging capacity. Sci Rep 2018; 8:14078. [PMID: 30232360 PMCID: PMC6145914 DOI: 10.1038/s41598-018-32271-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 09/05/2018] [Indexed: 11/11/2022] Open
Abstract
Ethidium bromide (EB) and acridine orange (AO) bind to nucleic acids and are thus considered as potential mutagens. In this study, the effects of EB and AO on the germination behaviours of white, yellow, red, and purple maize seeds were investigated. The results indicate that low concentrations of EB (50 μg mL−1) and AO (500 μg mL−1) promote germination, particularly for the white and yellow seeds. However, high concentrations of EB (0.5 mg mL−1) and AO (5 mg mL−1) significantly inhibit germination, with the level of inhibition decreasing in the following order: white > yellow > red > purple. In addition, EB and AO induce H2O2 production in a concentration-dependent manner. The effects of these mutagens on seed germination were partly reversed by dimethyl thiourea, a scavenger of reactive oxygen species (ROS), and diphenylene iodonium (DPI), an inhibitor of NADPH oxidase, while the effects were enhanced by treatment with H2O2 and 3-amino-1,2,4-triazole, a specific inhibitor of catalase. In addition, AO and EB profoundly increased NADPH oxidase activities in germinating seeds. The treatment of seeds with EB and AO did not affect the growth or drought tolerance of the resultant seedlings. The findings suggest that the mechanism of mutagen toxicity is related to the induction of ROS production.
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Bi C, Ma Y, Wu Z, Yu YT, Liang S, Lu K, Wang XF. Arabidopsis ABI5 plays a role in regulating ROS homeostasis by activating CATALASE 1 transcription in seed germination. PLANT MOLECULAR BIOLOGY 2017; 94:197-213. [PMID: 28391398 PMCID: PMC5437177 DOI: 10.1007/s11103-017-0603-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 03/13/2017] [Indexed: 05/18/2023]
Abstract
It has been known that ABA INSENSITIVE 5 (ABI5) plays a vital role in regulating seed germination. In the present study, we showed that inhibition of the catalase activity with 3-amino-1,2,4-triazole (3-AT) inhibits seed germination of Col-0, abi5 mutants and ABI5-overexpression transgenic lines. Compared with Col-0, the seeds of abi5 mutants showed more sensitive to 3-AT during seed germination, while the seeds of ABI5-overexpression transgenic lines showed more insensitive. H2O2 showed the same effect on seed germination of Col-0, abi5 mutants and ABI5-overexpression transgenic lines as 3-AT. These results suggest that ROS is involved in the seed germination mediated by ABI5. Further, we observed that T-DNA insertion mutants of the three catalase members in Arabidopsis displayed 3-AT-insensitive or -hypersensitive phenotypes during seed germination, suggesting that these catalase members regulate ROS homeostasis in a highly complex way. ABI5 affects reactive oxygen species (ROS) homeostasis by affecting CATALASE expression and catalase activity. Furthermore, we showed that ABI5 directly binds to the CAT1 promoter and activates CAT1 expression. Genetic evidence supports the idea that CAT1 functions downstream of ABI5 in ROS signaling during seed germination. RNA-sequencing analysis indicates that the transcription of the genes involved in ROS metabolic process or genes responsive to ROS stress is impaired in abi5-1 seeds. Additionally, expression changes in some genes correlative to seed germination were showed due to the change in ABI5 expression under 3-AT treatment. Together, all the findings suggest that ABI5 regulates seed germination at least partly by affecting ROS homeostasis.
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Affiliation(s)
- Chao Bi
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yu Ma
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Zhen Wu
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yong-Tao Yu
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Shan Liang
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Kai Lu
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xiao-Fang Wang
- Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
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Su L, Lan Q, Pritchard HW, Xue H, Wang X. Reactive oxygen species induced by cold stratification promote germination of Hedysarum scoparium seeds. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2016; 109:406-415. [PMID: 27816822 DOI: 10.1016/j.plaphy.2016.10.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 10/26/2016] [Accepted: 10/26/2016] [Indexed: 05/27/2023]
Abstract
Seed germination is comprehensively regulated by multiple intrinsic and extrinsic factors, and reactive oxygen species (ROS) are relatively new among these factors. However, the role and underlying mechanisms of ROS in germination regulation remain largely unknown. In this study, we initially found that cold stratification could promote germination and respiration of Hedysarum scoparium seeds, especially at low temperature. We then noted that a ROS environment change induced by hydrogen peroxide (H2O2) or methylviologen (MV) could similarly promote seed germination. On the other hand, the ROS scavenger N-acetyl-L-cysteine (NAC) suppressed germination of cold-stratified H. scoparium seeds, indicating a stimulatory role of ROS upon seed germination. An increased accumulation of O2- was detected in embryonic axes of cold-stratified seeds, and stratification-induced ROS generation as well as progressive accumulation of ROS during germination was further confirmed at the cellular level by confocal microscopy. Moreover, protein carbonylation in cold-stratified seeds was enhanced during germination, which was reversed by NAC treatment. Finally, the relationship between ROS and abscisic acid (ABA) or gibberellin (GA) in germination regulation was investigated. ABA treatment significantly inhibited germination and reduced the H2O2 content in both cold-stratified and non-cold-stratified seeds. Furthermore, we found that cold stratification mediates the down-regulation of the ABA content and increase of GA, suggesting an interaction between ROS and ABA/GA. These results in H. scoparium shed new light on the positive role of ROS and their cross-talk between plant hormones in seed germination.
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Affiliation(s)
- Liqiang Su
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, No.35, Tsinghua East Road, Beijing, 100083, PR China.
| | - Qinying Lan
- Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Germplasm Bank, Mengla, 666303 Yunnan, PR China.
| | - Hugh W Pritchard
- Seed Conservation Department, Royal Botanic Gardens, Kew, Wakehurst Place, West Sussex, RH176TN, UK.
| | - Hua Xue
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, No.35, Tsinghua East Road, Beijing, 100083, PR China.
| | - Xiaofeng Wang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, No.35, Tsinghua East Road, Beijing, 100083, PR China.
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Shalimu D, Sun J, Baskin CC, Baskin JM, Sun L, Liu Y. Changes in oxidative patterns during dormancy break by warm and cold stratification in seeds of an edible fruit tree. AOB PLANTS 2016; 8:plw024. [PMID: 27154624 PMCID: PMC4925924 DOI: 10.1093/aobpla/plw024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 04/06/2016] [Indexed: 05/30/2023]
Abstract
The transition from seed dormancy to germination is triggered by environmental factors, and in pomegranate (Punica granatum) seeds higher germination percentages are achieved by warm + cold stratification rather than by cold stratification alone. Our objective was to define the pattern of internal oxidative changes in pomegranate seeds as dormancy was being broken by warm + cold stratification and by cold stratification alone. Embryos isolated from seeds after 1-42 days of warm stratification, after 56 days of warm stratification + 7, 28 or 56 days of cold stratification, and after 1-84 days of cold stratification alone, were used in biochemical tests. Hydrogen peroxide (H2O2), nitric oxide (NO), proline, lipid peroxidation, protein carbonylation, and activities of the scavenging enzymes superoxide dismutase (SOD), hydrogen peroxide enzyme and peroxidase in the embryos were assessed by colorimetric methods. Our results indicated that warm + cold stratification had a stronger dormancy-breaking effect than cold stratification (85% versus 50% germination), which may be attributed to a higher yield of H2O2, NO, lipid peroxidation and protein carbonylation in warm + cold stratification. Furthermore, warm + cold stratification-induced H2O2 change led to greater changes (elevation followed by attenuation) in activities of the scavenging enzymes than that induced by cold stratification alone. These results indicated that restriction of the level of reactive oxygen species change within a positive and safe range by such enzymes promoted seed germination. In addition, a relatively strong elevation of proline during warm + cold stratification also contributed to dormancy breakage and subsequent germination. In conclusion, the strong dormancy alleviating effect of warm + cold stratification on pomegranate seeds may be attributed to the corresponding active oxidative change via H2O2, NO, proline, malondialdehyde, protein carbonylation and scavenging enzymes.
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Affiliation(s)
- Dilinuer Shalimu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
| | - Jia Sun
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
| | - Carol C Baskin
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546, USA
| | - Jerry M Baskin
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| | - Liwei Sun
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
| | - Yujun Liu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
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Bykova NV, Hu J, Ma Z, Igamberdiev AU. The Role of Reactive Oxygen and Nitrogen Species in Bioenergetics, Metabolism, and Signaling During Seed Germination. SIGNALING AND COMMUNICATION IN PLANTS 2015. [DOI: 10.1007/978-3-319-10079-1_9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Meimoun P, Mordret E, Langlade NB, Balzergue S, Arribat S, Bailly C, El-Maarouf-Bouteau H. Is gene transcription involved in seed dry after-ripening? PLoS One 2014; 9:e86442. [PMID: 24466101 PMCID: PMC3896479 DOI: 10.1371/journal.pone.0086442] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Accepted: 12/09/2013] [Indexed: 12/11/2022] Open
Abstract
Orthodox seeds are living organisms that survive anhydrobiosis and may display dormancy, an inability to germinate at harvest. Seed germination potential can be acquired during a prolonged period of dry storage called after-ripening. The aim of this work was to determine if gene transcription is an underlying regulatory mechanism for dormancy alleviation during after-ripening. To identify changes in gene transcription strictly associated with the acquisition of germination potential but not with storage, we used seed storage at low relative humidity that maintains dormancy as control. Transcriptome profiling was performed using DNA microarray to compare change in gene transcript abundance between dormant (D), after-ripened non-dormant (ND) and after-ripened dormant seeds (control, C). Quantitative real-time polymerase chain reaction (qPCR) was used to confirm gene expression. Comparison between D and ND showed the differential expression of 115 probesets at cut-off values of two-fold change (p<0.05). Comparisons between both D and C with ND in transcript abundance showed that only 13 transcripts, among 115, could be specific to dormancy alleviation. qPCR confirms the expression pattern of these transcripts but without significant variation between conditions. Here we show that sunflower seed dormancy alleviation in the dry state is not related to regulated changes in gene expression.
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Affiliation(s)
- Patrice Meimoun
- UMR 7622, UPMC Univ. Paris 06, CNRS, Bat C 2 ème étage, 4, place Jussieu, 75005 Paris, France
| | - Ernest Mordret
- UMR 7622, UPMC Univ. Paris 06, CNRS, Bat C 2 ème étage, 4, place Jussieu, 75005 Paris, France
| | - Nicolas B. Langlade
- Laboratoire Interactions Plantes-Microorganismes, INRA UMR 441, CNRS, UMR 2594, BP 52627, Chemin de Borde Rouge Auzeville, 31326 Castanet Tolosan, France
| | - Sandrine Balzergue
- Unité de Recherche en Génomique Végétale (URGV), UMR INRA 1165 - CNRS 8114 - UEVE, F-91057 Evry Cedex, France
| | - Sandrine Arribat
- Unité de Recherche en Génomique Végétale (URGV), UMR INRA 1165 - CNRS 8114 - UEVE, F-91057 Evry Cedex, France
| | - Christophe Bailly
- UMR 7622, UPMC Univ. Paris 06, CNRS, Bat C 2 ème étage, 4, place Jussieu, 75005 Paris, France
| | - Hayat El-Maarouf-Bouteau
- UMR 7622, UPMC Univ. Paris 06, CNRS, Bat C 2 ème étage, 4, place Jussieu, 75005 Paris, France
- * E-mail:
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Barba-Espín G, Diaz-Vivancos P, Job D, Belghazi M, Job C, Hernández JA. Understanding the role of H(2)O(2) during pea seed germination: a combined proteomic and hormone profiling approach. PLANT, CELL & ENVIRONMENT 2011; 34:1907-19. [PMID: 21711356 DOI: 10.1111/j.1365-3040.2011.02386.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In a previous publication, we showed that the treatment of pea seeds in the presence of hydrogen peroxide (H(2)O(2)) increased germination performance as well as seedling growth. To gain insight into the mechanisms responsible for this behaviour, we have analysed the effect of treating mature pea seeds in the presence of 20 mm H(2)O(2) on several oxidative features such as protein carbonylation, endogenous H(2)O(2) and lipid peroxidation levels. We report that H(2)O(2) treatment of the pea seeds increased their endogenous H(2)O(2) content and caused carbonylation of storage proteins and of several metabolic enzymes. Under the same conditions, we also monitored the expression of two MAPK genes known to be activated by H(2)O(2) in adult pea plants. The expression of one of them, PsMAPK2, largely increased upon pea seed imbibition in H(2)O(2) , whereas no change could be observed in expression of the other, PsMAPK3. The levels of several phytohormones such as 1-aminocyclopropane carboxylic acid, indole-3-acetic acid and zeatin appeared to correlate with the measured oxidative indicators and with the expression of PsMAPK2. Globally, our results suggest a key role of H(2)O(2) in the coordination of pea seed germination, acting as a priming factor that involves specific changes at the proteome, transcriptome and hormonal levels.
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Bazin J, Batlla D, Dussert S, El-Maarouf-Bouteau H, Bailly C. Role of relative humidity, temperature, and water status in dormancy alleviation of sunflower seeds during dry after-ripening. JOURNAL OF EXPERIMENTAL BOTANY 2011; 62:627-40. [PMID: 20978143 PMCID: PMC3003820 DOI: 10.1093/jxb/erq314] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 08/27/2010] [Accepted: 09/03/2010] [Indexed: 05/26/2023]
Abstract
The effect of various combinations of temperature and relative humidity on dormancy alleviation of sunflower seeds during dry after-ripening was investigated. The rate of dormancy alleviation depended on both temperature and embryo moisture content (MC). Below an embryo MC of 0.1 g H(2)O g(-1) dw, dormancy release was faster at 15 °C than at higher temperatures. This suggests that dormancy release at low MC was associated with negative activation energy, supported by Arrhenius plots, and low Q(10) values. At higher MC, the rate of dormancy alleviation increased with temperature, correlating well with the temperature dependence of biochemical processes. These findings suggests the involvement of two distinct cellular mechanisms in dormancy release; non-enzymatic below 0.1 g H(2)O g(-1) dw and associated with active metabolism above this value. The effects of temperature on seed dormancy release above the threshold MC were analysed using a population-based thermal time approach and a model predicting the rate of dormancy alleviation is provided. Sunflower embryo dormancy release was effective at temperatures above 8 °C (the base temperature for after-ripening, Tb(AR), was 8.17 °C), and the higher the after-ripening temperature above this threshold value, the higher was the rate of dormancy loss. Thermodynamic analyses of water sorption isotherms revealed that dormancy release was associated with less bound water and increased molecular mobility within the embryonic axes but not the cotyledons. It is proposed that the changes in water binding properties result from oxidative processes and can, in turn, allow metabolic activities.
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Affiliation(s)
- J. Bazin
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
| | - D. Batlla
- IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE-Buenos Aires, Argentina
| | - S. Dussert
- IRD, UMR DIA-PC, 911 Av. Agropolis, BP64501, F-34394 Montpellier, France
| | - H. El-Maarouf-Bouteau
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
| | - C. Bailly
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
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Volatile-mediated killing of Arabidopsis thaliana by bacteria is mainly due to hydrogen cyanide. Appl Environ Microbiol 2010; 77:1000-8. [PMID: 21115704 DOI: 10.1128/aem.01968-10] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The volatile-mediated impact of bacteria on plant growth is well documented, and contrasting effects have been reported ranging from 6-fold plant promotion to plant killing. However, very little is known about the identity of the compounds responsible for these effects or the mechanisms involved in plant growth alteration. We hypothesized that hydrogen cyanide (HCN) is a major factor accounting for the observed volatile-mediated toxicity of some strains. Using a collection of environmental and clinical strains differing in cyanogenesis, as well as a defined HCN-negative mutant, we demonstrate that bacterial HCN accounts to a significant extent for the deleterious effects observed when growing Arabidopsis thaliana in the presence of certain bacterial volatiles. The environmental strain Pseudomonas aeruginosa PUPa3 was less cyanogenic and less plant growth inhibiting than the clinical strain P. aeruginosa PAO1. Quorum-sensing deficient mutants of C. violaceum CV0, P. aeruginosa PAO1, and P. aeruginosa PUPa3 showed not only diminished HCN production but also strongly reduced volatile-mediated phytotoxicity. The double treatment of providing plants with reactive oxygen species scavenging compounds and overexpressing the alternative oxidase AOX1a led to a significant reduction of volatile-mediated toxicity. This indicates that oxidative stress is a key process in the physiological changes leading to plant death upon exposure to toxic bacterial volatiles.
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Oracz K, El-Maarouf-Bouteau H, Kranner I, Bogatek R, Corbineau F, Bailly C. The mechanisms involved in seed dormancy alleviation by hydrogen cyanide unravel the role of reactive oxygen species as key factors of cellular signaling during germination. PLANT PHYSIOLOGY 2009; 150:494-505. [PMID: 19329562 PMCID: PMC2675718 DOI: 10.1104/pp.109.138107] [Citation(s) in RCA: 157] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Accepted: 03/26/2009] [Indexed: 05/20/2023]
Abstract
The physiological dormancy of sunflower (Helianthus annuus) embryos can be overcome during dry storage (after-ripening) or by applying exogenous ethylene or hydrogen cyanide (HCN) during imbibition. The aim of this work was to provide a comprehensive model, based on oxidative signaling by reactive oxygen species (ROS), for explaining the cellular mode of action of HCN in dormancy alleviation. Beneficial HCN effect on germination of dormant embryos is associated with a marked increase in hydrogen peroxide and superoxide anion generation in the embryonic axes. It is mimicked by the ROS-generating compounds methylviologen and menadione but suppressed by ROS scavengers. This increase results from an inhibition of catalase and superoxide dismutase activities and also involves activation of NADPH oxidase. However, it is not related to lipid reserve degradation or gluconeogenesis and not associated with marked changes in the cellular redox status controlled by the glutathione/glutathione disulfide couple. The expression of genes related to ROS production (NADPHox, POX, AO1, and AO2) and signaling (MAPK6, Ser/ThrPK, CaM, and PTP) is differentially affected by dormancy alleviation either during after-ripening or by HCN treatment, and the effect of cyanide on gene expression is likely to be mediated by ROS. It is also demonstrated that HCN and ROS both activate similarly ERF1, a component of the ethylene signaling pathway. We propose that ROS play a key role in the control of sunflower seed germination and are second messengers of cyanide in seed dormancy release.
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Affiliation(s)
- Krystyna Oracz
- UPMC Univ Paris 06, Unité de Recherche 5, Germination et Dormance des Semences, Site d'Ivry, F-75005 Paris, France
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Bailly C, El Maarouf Bouteau H, Corbineau F. Rôle de la signalisation par les espèces réactives de l'oxygène dans la germination et la levée de dormance des semences. ACTA ACUST UNITED AC 2008; 202:241-8. [DOI: 10.1051/jbio:2008025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Bailly C, El-Maarouf-Bouteau H, Corbineau F. From intracellular signaling networks to cell death: the dual role of reactive oxygen species in seed physiology. C R Biol 2008; 331:806-14. [DOI: 10.1016/j.crvi.2008.07.022] [Citation(s) in RCA: 438] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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El-Maarouf-Bouteau H, Bailly C. Oxidative signaling in seed germination and dormancy. PLANT SIGNALING & BEHAVIOR 2008; 3:175-82. [PMID: 19513212 PMCID: PMC2634111 DOI: 10.4161/psb.3.3.5539] [Citation(s) in RCA: 194] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Accepted: 01/08/2008] [Indexed: 05/18/2023]
Abstract
Reactive Oxygen Species (ROS) play a key role in various events of seed life. In orthodox seeds, ROS are produced from embryogenesis to germination, i.e., in metabolically active cells, but also in quiescent dry tissues during after ripening and storage, owing various mechanisms depending on the seed moisture content. Although ROS have been up to now widely considered as detrimental to seeds, recent advances in plant physiology signaling pathways has lead to reconsider their role. ROS accumulation can therefore be also beneficial for seed germination and seedling growth by regulating cellular growth, ensuring a protection against pathogens or controlling the cell redox status. ROS probably also act as a positive signal in seed dormancy release. They interact with abscisic acid and gibberellins transduction pathway and are likely to control numerous transcription factors and properties of specific protein through their carbonylation.
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Oracz K, El-Maarouf-Bouteau H, Bogatek R, Corbineau F, Bailly C. Release of sunflower seed dormancy by cyanide: cross-talk with ethylene signalling pathway. JOURNAL OF EXPERIMENTAL BOTANY 2008; 59:2241-51. [PMID: 18448476 PMCID: PMC2413275 DOI: 10.1093/jxb/ern089] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Revised: 02/29/2008] [Accepted: 03/04/2008] [Indexed: 05/18/2023]
Abstract
Freshly harvested sunflower (Helianthus annuus L.) seeds are considered to be dormant because they fail to germinate at relatively low temperatures (10 degrees C). This dormancy results mainly from an embryo dormancy and disappears during dry storage. Although endogenous ethylene is known to be involved in sunflower seed alleviation of dormancy, little attention had been paid to the possible role of cyanide, which is produced by the conversion of 1-aminocyclopropane 1-carboxylic acid to ethylene, in this process. The aims of this work were to investigate whether exogenous cyanide could improve the germination of dormant sunflower seeds and to elucidate its putative mechanisms of action. Naked dormant seeds became able to germinate at 10 degrees C when they were incubated in the presence of 1 mM gaseous cyanide. Other respiratory inhibitors showed that this effect did not result from an activation of the pentose phosphate pathway or the cyanide-insensitive pathway. Cyanide stimulated germination of dormant seeds in the presence of inhibitors of ethylene biosynthesis, but its improving effect required functional ethylene receptors. It did not significantly affect ethylene production and the expression of genes involved in ethylene biosynthesis or in the first steps of ethylene signalling pathway. However, the expression of the transcription factor Ethylene Response Factor 1 (ERF1) was markedly stimulated in the presence of gaseous cyanide. It is proposed that the mode of action of cyanide in sunflower seed dormancy alleviation does not involve ethylene production and that ERF1 is a common component of the ethylene and cyanide signalling pathways.
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Affiliation(s)
- Krystyna Oracz
- UPMC Université Paris 06, EA2388, Physiologie des semences, Site d'Ivry, Boîte courrier 152, 4 Place Jussieu, F-75005 Paris, France
- Department of Plant Physiology, Warsaw University of Life Sciences, Nowoursynowska 159, 02–776, Warsaw, Poland
| | - Hayat El-Maarouf-Bouteau
- UPMC Université Paris 06, EA2388, Physiologie des semences, Site d'Ivry, Boîte courrier 152, 4 Place Jussieu, F-75005 Paris, France
| | - Renata Bogatek
- Department of Plant Physiology, Warsaw University of Life Sciences, Nowoursynowska 159, 02–776, Warsaw, Poland
| | - Françoise Corbineau
- UPMC Université Paris 06, EA2388, Physiologie des semences, Site d'Ivry, Boîte courrier 152, 4 Place Jussieu, F-75005 Paris, France
| | - Christophe Bailly
- UPMC Université Paris 06, EA2388, Physiologie des semences, Site d'Ivry, Boîte courrier 152, 4 Place Jussieu, F-75005 Paris, France
- To whom correspondence should be addressed. E-mail:
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