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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 劉啟德 | zh_TW |
| dc.contributor.advisor | Chi-Te Liu | en |
| dc.contributor.author | Swarnali Roy | zh_TW |
| dc.contributor.author | Swarnali Roy | en |
| dc.date.accessioned | 2026-09-09T16:08:47Z | - |
| dc.date.available | 2026-09-10 | - |
| dc.date.copyright | 2026-09-09 | - |
| dc.date.issued | 2026 | - |
| dc.date.submitted | 2026-08-11 12:07:22 | - |
| dc.identifier.citation | Aadhar, S., and Mishra, V. (2023). The 2022 mega heatwave in South Asia in the observed and projected future climate. Environmental Research Letters, 18(10), 104011.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/105089 | - |
| dc.description.abstract | 在氣候變遷的影響下，土壤鹽害與高溫逆境日益頻繁地同時發生，對作物生長、光合作用及氧化還原恆定造成超越單一逆境之協同性損害。植物根際促生菌（PGPR）為提升作物抗逆性提供了一種永續策略，然而PGPR在複合逆境下介導保護作用之機制仍不甚明瞭。本論文探討沼澤紅假單胞菌（Rhodopseudomonas palustris）菌株 PS3、TPN1及 YSC3是否能提升阿拉伯芥（Arabidopsis thaliana）對鹽害、高溫及鹽熱複合逆境之耐受性，並解析介導此保護作用之細菌性狀與植物訊號傳遞途徑。
本研究首先評估細菌產生之5-胺基乙醯丙酸（5-ALA）對鹽逆境耐受性之貢獻，比較三株ALA產量不同之菌株與外源ALA處理在50 mM NaCl條件下之效果。TPN1賦予最強之保護作用，改善離子恆定（ NHX1、HKT1）、葉綠素生合成（ HEMA1、CHLH）、抗氧化防禦及根系構型。ALA產量較低之菌株亦賦予相當之保護效果，顯示ALA產量不足以完全解釋紫色非硫細菌介導之鹽害耐受性，而胞外多醣（EPS）及吲哚乙酸（IAA）之產生具有重要貢獻。 進一步將分析延伸至高溫及鹽熱複合逆境，並利用fin219-2（JAR1）突變體解析茉莉酸訊號途徑。菌株效力排序在高溫逆境下發生逆轉：先前被歸類為促生無效之 YSC3，因其優越之細菌耐熱性及在45°C下維持EPS與IAA產生之能力，提供最強之保護作用。LC-MS/MS及RT-qPCR分析顯示，保護作用主要透過非JA-Ile依賴性途徑運作，特別是HSFA2–HSP101分子伴護蛋白軸及 CAT2/APX1抗氧化網絡，此等途徑在fin219-2中仍維持顯著之菌株依賴性誘導能力，而典型 COI1–JAZ–MYC2訊號傳遞僅具部分貢獻。 綜合而言，本研究結果支持一項模型：R. palustris透過協調調控多種細菌性狀與植物訊號傳遞網絡來增強植物逆境耐受性，而特定機制之相對重要性取決於所遭受逆境之類型與組合。 | zh_TW |
| dc.description.abstract | As climate change progresses, soil salinity and heat stress increasingly co-occur, causing synergistic damage to crop development, photosynthetic capacity, and oxidative-reductive equilibrium that exceeds the impact of either stress alone. Plant growth-enhancing rhizobacteria (PGPR) offer a sustainable strategy for improving crop stress tolerance, yet the underlying mechanisms of PGPR-mediated protection under combined stress remain insufficiently understood. This thesis examined whether Rhodopseudomonas palustris strains (PS3, TPN1, YSC3) can improve Arabidopsis thaliana resilience to salt, heat, and combined salt-heat stress, and identified the microbial characteristics and plant signaling routes responsible for this protective effect.
The contribution of bacterially produced 5-aminolevulinic acid (5-ALA) in salt stress tolerance was initially evaluated by contrasting three strains differing in ALA output alongside exogenous ALA application under 50 mM NaCl. TPN1 provided the most robust protection, strengthening ionic equilibrium (NHX1, HKT1), chlorophyll biosynthesis (HEMA1, CHLH), antioxidant defense, and root architecture. Isolates with lower ALA output still provided comparable advantages, confirming that ALA biosynthesis alone is insufficient to account for nPNSB-driven salt tolerance and that EPS and IAA synthesis play significant roles. The analysis was subsequently broadened to include heat and combined salt-heat stress, with jasmonate signaling dissected using the fin219-2 (JAR1) mutant. The order of strain effectiveness reversed under heat stress conditions: YSC3, previously categorized as growth-promotion-inactive, delivered the strongest protection attributable to superior bacterial thermotolerance and sustained EPS and IAA biosynthesis at 45 °C. LC-MS/MS and RT-qPCR data indicated that protection functions primarily through JA-Ile-independent routes, particularly the HSFA2–HSP101 chaperone axis and CAT2/APX1 antioxidant networks, which maintained considerable responsiveness in the fin219-2 background, whereas the canonical COI1–JAZ–MYC2 signaling made a partial contribution. Together, these findings support a model in which R. palustris enhances plant stress tolerance through synchronized regulation of diverse microbial characteristics and plant signaling cascades, where the relative significance of particular pathways varies according to the type and combination of stresses experienced. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2026-09-09T16:08:47Z No. of bitstreams: 0 | en |
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| dc.description.tableofcontents | Doctoral dissertation acceptance certificate i
Acknowledgement ii 中文摘要 iv Abstract v Table of Contents vii List of Figures xiii List of Tables xvi List of Abbreviations xviii Chapter 1 General introduction 1 1.1 Global climate shifts and the increasing prevalence of simultaneous abiotic stresses 1 1.2 How plants cope with salinity and thermal stress 2 1.2.1 Ionic and osmotic perturbations caused by salinity 2 1.2.2 Thermal stress and cellular protein stability 4 1.2.3 Concurrent salt and heat stress as a unique physiological state 5 1.3 The role of oxylipin signaling during abiotic stress 6 1.4 Purple non-sulfur bacteria and rhizobacteria that promote plant growth in sustainable crop production 8 1.4.1 Biosynthesis of 5-aminolevulinic acid (5-ALA) 9 1.4.2 Generation of indole-3-acetic acid (IAA) 9 1.4.3 Biological conversion of atmospheric nitrogen (BNF) 10 1.4.4 Production of extracellular polysaccharides (EPS) 11 1.4.5 Elicitation of systemic plant defenses (ISR) and reshaping of microbial communities 12 1.4.6 Convergence of protective mechanisms during simultaneous stresses 12 1.5 Rhodopseudomonas palustris as a plant growth-enhancing and stress-alleviating agent 13 1.6 Study rationale and research objectives 15 Chapter 2 Screening and Physiological Characterization of R. palustris Strains for Salt Stress Mitigation in Arabidopsis thaliana 19 2.1 Overview 19 2.2 Experimental design 21 2.2.1 Evaluation of the salt tolerance of different R. palustris strains 21 2.2.2 Determination of the bacterial growth curve of different R. palustris strains 22 2.2.3 Quantitative analysis of ALA production 23 2.2.4 Determination of extracellular polysaccharides and indole-3-acetic acid (IAA) produced by R. palustris strains 23 2.2.5 Plant material and growth conditions 25 2.2.6 Determination of growth-enhancing traits under stress 26 2.2.6.1 In vitro plate assay (50 mM NaCl) 27 2.2.6.2 Pot experiment (100 mM NaCl) 28 2.2.7 Photosynthetic performance and pigment analysis 30 2.2.8 Determination of hydrogen peroxide (H2O2) content 31 2.2.9 Determination of nonenzymatic antioxidant activity 31 2.2.10 Determination of antioxidant enzymatic activity 31 2.2.11 Determination of water status, proline concentration, lipid peroxidation, and membrane ion leakage 32 2.2.12 Expression analysis of genes related to ALA metabolism, the antioxidant response, and salt tolerance 34 2.3 Results 35 2.3.1 Quantification of extracellular ALA production in three R. palustris strains 35 2.3.2 Salt tolerance, growth response and EPS formation of R. palustris strains under varying NaCl concentrations 36 2.3.3 Preliminary screening for the optimal exogenous ALA concentration 37 2.3.4 R. palustris inoculation enhances vegetative growth under saline stress 38 2.3.5 R. palustris inoculation improves A. thaliana photosynthetic performance under saline stress 39 2.3.6 R. palustris inoculation enhances the physiological resilience of A. thaliana under saline stress 40 2.3.7 R. palustris inoculation modulates stress-related gene activity under salinity 42 2.4 Proposed mechanism 44 2.5 Discussion 44 2.5.1 Model validation and salinity stress in A. thaliana 44 2.5.2 ALA and ALA-synthesizing bacteria as effective stress-relief agents 45 2.5.3 Physiological acclimation and photosynthetic capacity during salt stress 47 2.5.4 EPS production and ionic balance 50 2.5.5 Proposed two-tier framework for salt tolerance 51 2.6 Chapter Summary 51 Chapter 3 R. palustris Enhances Heat and Combined Salt–Heat Stress Tolerance Through Modulation of Oxylipin Signaling in A. thaliana 52 3.1 Overview 52 3.2 Experimental design 54 3.2.1 Bacterial strains and heat tolerance assay 54 3.2.2 Quantification of extracellular polysaccharides 56 3.2.3 Quantification of indole-3-acetic acid production 57 3.2.4 Plant material and growth conditions 57 3.2.5 Bacterial inoculation and stress treatments 58 3.2.6 Morpho-physiological measurements 62 3.2.7 Quantitative analysis of endogenous JA and JA-Ile by LC-MS/MS 62 3.2.8 Photosynthetic performance and pigment analysis 63 3.2.9 Determination of hydrogen peroxide content 64 3.2.10 Nonenzymatic antioxidant assays, enzyme activities, water status, proline concentration, and lipid peroxidation 64 3.2.11 Gene activity analysis by RT-qPCR 64 3.2.12 Experimental design and statistical analysis 65 3.3 Results 66 3.3.1 Strain-specific thermotolerance and plant growth-enhancing trait expression in R. palustris 66 3.3.2 R. palustris inoculation confers developmental and physiological resilience to abiotic stress 67 3.3.3 R. palustris stabilizes photosynthetic integrity, plant water status, and reduces oxidative injury 68 3.3.4 Attenuated stress protection in the fin219-2 (JAR1-deficient) mutant suggests partial dependence on JA-Ile signaling 69 3.3.5 R. palustris inoculation promotes strain-dependent JA and JA-Ile accumulation in Col-0, whereas JA-Ile remains undetectable in fin219-2 70 3.3.6 R. palustris amplifies stress-induced defense gene activity through JA-Ile-dependent and JA-Ile-independent pathways 71 3.4 Discussion 72 3.4.1 Bacterial thermotolerance, rather than baseline growth-promoting capacity, is associated with PGPR efficacy under heat stress 72 3.4.2 Partial contribution of JA-Ile signaling: evidence from the fin219-2 mutant 73 3.4.3 JA-Ile-independent chaperone and antioxidant pathways as major contributors to stress protection 73 3.4.4 Proposed mechanism 74 3.4.5 Experimental considerations 75 3.5 Chapter summary 75 Chapter 4 Concluding Remarks 77 4.1 Summary of key findings 77 4.2 Integration of findings 78 4.3 Practical implications 78 4.4 Limitations and future directions 79 Figures 80 Tables 118 References 139 Appendix 172 | - |
| dc.language.iso | en | - |
| dc.subject | 阿拉伯芥 | - |
| dc.subject | 複合非生物逆境 | - |
| dc.subject | 5-胺基乙醯丙酸 | - |
| dc.subject | 胞外多醣 | - |
| dc.subject | 茉莉酸訊號傳遞 | - |
| dc.subject | 植物根際促生菌 | - |
| dc.subject | 沼澤紅假單胞菌 | - |
| dc.subject | 鹽害逆境 | - |
| dc.subject | 菌株特異性耐熱性 | - |
| dc.subject | 逆境緩解 | - |
| dc.subject | Arabidopsis thaliana | - |
| dc.subject | combined abiotic stress | - |
| dc.subject | 5-aminolevulinic acid | - |
| dc.subject | extracellular polysaccharides | - |
| dc.subject | jasmonate signaling | - |
| dc.subject | rhizobacteria that promote plant growth | - |
| dc.subject | Rhodopseudomonas palustris | - |
| dc.subject | salt stress | - |
| dc.subject | strain-specific thermotolerance | - |
| dc.subject | stress mitigation | - |
| dc.title | 探討沼澤紅假單胞菌提升阿拉伯芥耐受鹽害與高溫複合逆境之作用機制 | zh_TW |
| dc.title | Elucidating the Role of Rhodopseudomonas palustris in Enhancing Arabidopsis thaliana Tolerance to Combined Salt and Heat Stress | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 114-2 | - |
| dc.description.degree | 博士 | - |
| dc.contributor.coadvisor | 陳仁治 | zh_TW |
| dc.contributor.coadvisor | Jen-Chih Chen | en |
| dc.contributor.oralexamcommittee | 林乃君;林詩舜;劉嚞睿 | zh_TW |
| dc.contributor.oralexamcommittee | Nai-Chun Lin;Shih-Shun Lin;Je-Ruei Liu | en |
| dc.subject.keyword | 阿拉伯芥; 複合非生物逆境; 5-胺基乙醯丙酸; 胞外多醣; 茉莉酸訊號傳遞; 植物根際促生菌; 沼澤紅假單胞菌; 鹽害逆境; 菌株特異性耐熱性; 逆境緩解 | zh_TW |
| dc.subject.keyword | Arabidopsis thaliana; combined abiotic stress; 5-aminolevulinic acid; extracellular polysaccharides; jasmonate signaling; rhizobacteria that promote plant growth; Rhodopseudomonas palustris; salt stress; strain-specific thermotolerance; stress mitigation | en |
| dc.relation.page | 189 | - |
| dc.identifier.doi | 10.6342/NTU202603718 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2026-08-13 | - |
| dc.contributor.author-college | 生物資源暨農學院 | - |
| dc.contributor.author-dept | 生物科技研究所 | - |
| dc.date.embargo-lift | 2031-07-15 | - |
| 顯示於系所單位： | 生物科技研究所 | |
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