土壤鹽分的升高（尤其是NaCl所引起的）是極為嚴(yán)重的非生物脅迫,抑制了全球約20%灌溉土地的植物生產(chǎn)力。棉花是當(dāng)今世界上公認(rèn)的規(guī)模最大的紡織纖維,也是重要的耐鹽作物,已成為鹽堿地主要的栽培作物。甜菜堿（Glycine betaine,GB）是一種具有活躍滲透能力的化合物,在植物抵御高寒和高鹽等非生物脅迫過程發(fā)揮著重要作用,水楊酸（Salicylic acid,SA）是一種在調(diào)節(jié)植物多種生理和生化特性中占有重要地位的植物激素,可以影響植物應(yīng)對非生物脅迫響應(yīng)過程。深入研究鹽分脅迫條件下噴施甜菜堿（GB）及水楊酸（SA）對棉花植株生理、生化特性的影響過程,探索噴施外源物質(zhì)對棉花適應(yīng)鹽分脅迫的調(diào)控機理,對于補充完善施用外源物質(zhì)（如GB和SA）對棉花耐鹽能力調(diào)控理論具有重要的理論與實踐意義。本研究旨在探討葉面噴施甜菜堿（GB）和水楊酸（SA）對高鹽（NaCl）脅迫條件下棉花幼苗生理生化特性的影響。在150 mM NaCl條件下,噴施外源GB設(shè)置3個處理（GB濃度分別為2.5、5.0和7.5 mM）,噴施外源SA設(shè)置3個處理（SA濃度分別為1.0、1.5和2.0 mM）,不噴施外源物質(zhì)的處理1個,... 

【文章來源】：中國農(nóng)業(yè)科學(xué)院北京市

【文章頁數(shù)】：74 頁

【學(xué)位級別】：碩士

【文章目錄】：
摘要
Abstract
Abbreviation
Chapter1 Background
    1.1 Introduction
    1.2 Soil salinization and its impact on plants
        1.2.1 Effects of salinity stress on plant growth
        1.2.2 Effects of salinity stress on plant photosynthesis
        1.2.3 Responses of antioxidant enzymes activities to salt stress
        1.2.4 Effects of salinity stress on nutrient balance
        1.2.5 Effects of salinity stress on hydraulic conductivity
        1.2.6 Mechanism of salt tolerance
        1.2.7 Amelioration of Salinity Stress
    1.3 Glycine betaine
        1.3.1 Natural production and accumulation of GB
        1.3.2 Effects of Glycine Betaine（GB）
        1.3.3 GB and Salt tolerance in plants
        1.3.4 Exogenous GB applications under salt stress
    1.4 Salicylic acid
        1.4.1 Natural production and accumulation of SA
        1.4.2 Exogenous SA applications under salt stress
    1.5 Research hypothesis
    1.6 Research Objectives
    1.7 Technical route
Chapter2 Research methodology
    2.1 Study site and experimental design
    2.2 Measurements
        2.2.1 Leaf gas exchange and chlorophyll fluorescence
        2.2.2 The key photosynthetic enzymes and photosynthetic pigments
        2.2.3 Antioxidant enzymes,MDA and LRWC
        2.2.4 Experimental Soil EC and p H
        2.2.5 Plant growth characteristics
        2.2.6 Endogenous GB,SA,nitrogen and ions contents
    2.3 Statistical analysis
Chapter3 Responses of leaf gas exchange attributes,photosynthetic pigments and antioxidant enzymes in Na Cl-stressed cotton（Gossypium hirsutum L.）seedlings to exogenous GB and SA
    3.1 Introduction
    3.2 Results
        3.2.1 Responses of endogenous GB and SA to exogenous GB and SA
        3.2.2 Response of leaf gas exchange to exogenous GB and SA
        3.2.3 Response of photosynthetic enzymes MDA and LRWC to exogenous GB and SA
        3.2.4 Response of chlorophyll fluorescence to exogenous GB and SA
        3.2.5 Responses of photosynthetic pigments to exogenous GB and SA
        3.2.6 Responses of antioxidant enzymes to exogenous GB and SA
        3.2.7 Relationships between Pn,FV/FM and chlorophyll a and chlorophyll b content
    3.3 Discussion
    3.4 Summary
Chapter4 Application of exogenous protectants mitigates salt-induced Na+toxicity and sustains cotton（Gossypium hirsutum L.）seedlings growth:comparison of GB and SA
    4.1 Introduction
    4.2 Results
        4.2.1 Influence of exogenous GB and SA on growth and nitrogen accumulation
        4.2.2 Influence of exogenous GB and SA on PLC
        4.2.3 Effect of exogenous GB and SA on ion contents in the shoot and roots of seedlings
        4.2.4 Relationship between PLC and shoot nutrients
    4.3 Discussion
    4.4 Summary
Chapter5 Conclusions and Recommendations
    5.1 Conclusions
    5.2 Recommendations
References
Acknowledgements
Author’s Biography


【參考文獻】：
期刊論文
[1]根施甜菜堿對水分脅迫下煙草幼苗光合機構(gòu)的保護[J]. 馬新蕾,王玉軍,謝勝利,李峰,王瑋.  植物生理與分子生物學(xué)學(xué)報. 2006(04)
[2]硅改善鹽脅迫下庫拉索蘆薈生長和離子吸收與分布(英文)[J]. 徐呈祥,劉友良,鄭青松,劉兆普.  植物生理與分子生物學(xué)學(xué)報. 2006(01)
[3]水楊酸和熱鍛煉誘導(dǎo)的高羊茅幼苗的耐熱性與抗氧化的關(guān)系[J]. 何亞麗,劉友良,陳權(quán),卞愛華.  植物生理與分子生物學(xué)學(xué)報. 2002(02)



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