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Studied on Drought Resistance of Calligonum Mongolicum Turcz.in Different Geographical Provenance with Water Gradient

Author: QiuZhenJing
Tutor: LiYi
School: Gansu Agricultural University
Course: Tree Genetics and Breeding
Keywords: Calligonum Moisture gradient Geographical Provenance Drought tolerance Water physiological PEG Osmotic Stress Correlation Analysis Principal Component Analysis
CLC: S793.1
Type: Master's thesis
Year: 2010
Downloads: 66
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Abstract


This study Calligonum xerophytic shrubs sand (Calligonum mongolicum Turcz.) For research materials, research Calligonum physiological characteristics between different geographical provenance in the Hexi Corridor in Gansu Province moisture gradient from east to west decreasing conditions while PEG Osmotic Stress different geographical provenance of Calligonum Physiological response to a comparative study to explore the mechanism of drought. Draw the following conclusions: 1. Hexi Corridor in Gansu Province decreasing moisture gradient from east to west under the conditions of different geographical provenance of sand Shui dates assimilation branches membrane lipid peroxidation product malondialdehyde (MDA) content increases, osmotic adjustment substances proline and soluble sugar content were reduced SOD content decreased, while the soluble protein content gradually reduced. POD content was first increased and then decreased. Different geographical provenance of sand Calligonum seedlings proline (Pro) content with the duration of stress time and increasing soluble sugar content (SS) was increased and then decreased again rising trend with time, malondialdehyde content with the processing time was first increased and then decreased trend (MDA), superoxide dismutase (SOD) activity with time there has been the trend of the \first increased and then decreased. The three geographical provenance of seedlings in different intensity PEG stress under the overall trend is consistent among the stress treatments significantly different (P lt; 0.05), Pro content increased for Wuwei gt; Jiuquan gt; Zhangye. The SS content increase Jiuquan,, gt; Zhangye, gt; Wuwei. MDA content increased for Wuwei gt; the Zhangye gt; Jiuquan. SOD activity increase the Wuwei gt; the Zhangye gt; Jiuquan, the the POD activity increase Jiuquan gt; the Wuwei gt; Zhangye. The drought tolerant mechanisms exist different geographical provenance Calligonum differences, and protective enzyme system of regulation is an important physiological reaction of its adaptation to the ecological environment. The correlation analysis showed: Pro content with the content of MDA was positively correlated, negatively correlated with SOD activity was negatively correlated with the POD. SS content and MDA content was positively correlated with MDA content and SOD activity was negatively correlated with POD was positively correlated. SOD activity and POD activity was negatively correlated. SP and Pro, SS, MDA was positively correlated, but was negatively correlated with the activity of POD. The role of different sizes can be seen, the three geographical provenance of Calligonum various factors, said Martinez Calligonum Drought mechanism differences. The principal component analysis showed that: the information carried by the three geographical provenance of drought resistance indicators consistent. First principal component of SOD, SS, SP, second principal component MDA, Pro; Zhangye drought resistance first principal component MDA Pro, SS, the second principal component SP, SOD; Jiuquan drought indicators in the the Wuwei drought index The main ingredient is SS, SP, Pro, the second principal component MDA, SOD. third principal component of the three geographical provenance of drought indicators POD activity. The three geographical provenance of Calligonum membership functions of fuzzy mathematics comprehensive evaluation results show that the Wuwei gt; the Jiuquan gt; Zhangye.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved shrubs > Calligonum
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