Dissertation > Excellent graduate degree dissertation topics show

Physiological Response to Drought Stress and Drought Resistance Estimation of Five Desert Shrub Seedling in Hexi Region

Author: HuoHong
Tutor: ZhangYong;ChenNianLai
School: Gansu Agricultural University
Course: Ecology
Keywords: drought stress desert shrubs physiological and biochemical indexes principal component analysis evaluation of drought resistance
CLC: S793
Type: Master's thesis
Year: 2010
Downloads: 63
Quote: 0
Read: Download Dissertation


This paper discusses the characteristics of physiological adaptation of five typical desert shrubs: Caragana microphylla Laxm., Caragana roborovskyi Kom. , Ammopiptanthus mongolicus (Maxim.) Cheng f., Hedysarum scoparium Fisch.et Mey. and Zygophyllumxanthoxylom Maxim.),which simulated the soil under drought stress in terms of the potted plants with water-break, meanwhile, the subordinate function value method is applied to evaluate drought resistance of these five shrubs synthetically, hoping to provide theoretical basis for exploration of drought resistance of desert plants, and government of desertification. There are main experimental results as follows:(1) It is because of drought stress that causes decrease of relative water content of tissue of seedlings leaves, but increases water saturation deficit. The shrubs leaves with strong drought resistance those are relatively of small amplitudes, and strong with maintenances of normal water works.(2) Chlorophyll content of five shrubs is changing differently in the course of drought stress. At the end of drought stress, chlorophyll content of Caragana roborovskyi Kom. decreases obviously more than Zygophyllumxanthoxylom Maxim., of which Caragana microphylla Lam. increases remarkably more than Ammopiptanthus mongolicus (Maxim.) Cheng f. as well as Hedysarum scoparium Fisch.et Mey..(3) It is manifested that Osmotic adjustment substance of these five desert shrubs under the situation of drought stress stimulates accumulation of proline and soluble sugar of the leaves. The proline content of Caragana roborovskyi Kom. is notably higher than those of Caragana microphylla Lam., Ammopiptanthus mongolicus (Maxim.) Cheng f., Hedysarum scoparium Fisch.et Mey. and Zygophyllumxanthoxylom Maxim.. The soluble sugar content of Hedysarum scoparium Fisch.et Mey. is universally higher than those of Caragana microphylla Lam., Ammopiptanthus mongolicus (Maxim.) Cheng f., Caragana roborovskyi Kom. and Zygophyllumxanthoxylum Maxim..(4) The content of MDA increases with aggravation of drought stress, and in the same situation, MDA content of Hedysarum scoparium Fisch.et Mey. is sharply higher than other species. Three protective enzyme activities, SOD、POD、CAT, are all increasing under drought stress, however, the changes among species are different.(5) It is analyzed by principal component of physiological and biochemical indexes of shrubs seedlings that relative water content of leaves, proline, soluble sugar and antioxidant enzyme activities have relatively close relationships with drought resistance of these five shrubs.(6) The five desert shrubs drought resistances are evaluated by the subordinate function value method of fuzzy mathematics, and it is got to know that Caragana roborovskyi Kom.> Caragana microphylla Lam.> Ammopiptanthus mongolicus (Maxim.) Cheng f.> Hedysarum scoparium Fisch. et Mey.> Zygophyllumxanthoxylom Maxim..

Related Dissertations

  1. Drought Stress on the Osmanthus Growth and Physiological Ecology Effect,S685.13
  2. Effects of Low Temperature Stress on Blood Physiological and Biochemical Indexes of Oreochromis Hornorum,S917.4
  3. Application of Improved Principal Component Analysis Algorithm in Course Construction,G642.4
  4. Effects of Gradually Drought on Physiological Indeces of Seeding in Tree Peony and Cloning with Sequence Analysis of Ga20-ox Synthesis of Tree Peony,S685.11
  5. Effect of Drought Stress on Anatomical Structure and Physiological Characteristics in Solanum Nigrum,S649
  6. Research of Diagnosing Cucumber Diseases Based on Hyperspectral Imaging,S436.421
  7. The Impact of Tourism on Typical Vegetation in Luya Mountain Nature Reserve, Shanxi Province,S759.9
  8. Macaca mulatta palm morphological study of pattern ridge count,Q954
  9. Zhaoguan Lower Coal Group water inrush prediction and control techniques,TD745
  10. Research on Cultural Industrial Competitiveness of Chong Qing,F224
  11. The Research of Prairie Road Light Environment Effects on Physiological Indicators of Drivers,U491.254
  12. Research on Feature Extraction, Selection and Classification Algorithms for Pulmonary CAD,TP391.41
  13. Research Onamethod for Human Face Recognition Based on MMTD,TP391.41
  14. Competitiveness’ Evaluation and Development Strategy of the Tourism Industry in Huanggang City,F592.7
  15. Research on Rural Information Promoting Urban-rural Integration in Jiangsu Southern Area,F127;F224
  16. The Design of Information System of Power Equipment Current-carrying Faults Diagnosis,TP311.52
  17. The Research of E-government System Performance Evaluation Index System in Linyi City Based on the Principal Component Analysis,G206
  18. Face recognition algorithm based on feature fusion research,TP391.41
  19. Visual underwater target detection and recognition,TP391.41
  20. Decision fusion based on multi- model air separation process fault detection and prediction,TQ116.11
  21. EEG -based emotion recognition,TP391.4

CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved shrubs
© 2012 www.DissertationTopic.Net  Mobile