| Hydrangea macrophylla originates in China, and is distributed in regions and provinces along south of the Yangtze River Basin. It is an important ornamental plant in garden with strong resistance to aluminum (Al) stress. Based on the effects of Al stress on physiological and photosynthetic characteristics of Hydrangea macrophylla, this thesis studies the differences of resistance to Al stress through principal component analysis and subordinate function. Main findings and conclusions are as follows:1 Effects of Al stress on physiology characteristics of Hydrangea macrophyllaThe curves of the chlorophyll content changes of Hydrangea macrophylla showed that R~2 varied between 0.850-0.997, and R~2>0.95 in the three species. The maximum was F, the curve equation was y=0.15x~2-1.8398x+13.199, (R~2=0.997).The changes of Pro content of Hydrangea macrophylla were very evident. Four cultivars's curve equations R~2>0.95. F was the maximum, of which R~2>0.95, and the curve equation was y=0.0704x~2-0.3065x+0.2912. Meanwhile, the maximum increase of the content of Pro in G was 59.5 times, while the minimum E 30.68 times.Among the dissolvable sugar content of Hydrangea macrophylla, there were five species, in which R~2>0.95,occupying 71.4% of the total. The related coefficients change between 0.9084-0.9921.R~2 of A is the maximum, equals 0.9921, and the curve equation was y= 0.0199x~2-0.0781x+0.4876.The changes of the protein content of Hydrangea macrophylla and the concentration of Al stress were negatively correlated. R2 varies between 0.849-0.990. Three cultivars's curve equations R~2>0.95.R~2 of F was the maximum, equals 0.990, and the curve eqation is y=-0.0841x~2+0.2862x+4.209.In the curve equation of the IL rate changes of Hydrangea macrophylla cells, R~2 variedbetween 0.913-0.984.There were five equations in which R~2>0.95,occupying 71.4% of the total.R~2 of D was the maximum, equaled 0.984, the curve equation was y = 4.2643 x~2-11.999x+123.92.In the curve equation of the changes of the MDA content of Hydrangea macrophylla,R~2 varied between 0.962-0.991. All of the seven cultivars' curve equations R~2>0.95. The maximum was G,equaled 0.991; D was the minimum, 0.962. The increase range of the MDA content of B is the highest among the seven, adding up to 57.90%; D was the lowest, to 39.62%.In the curve equation of the changes of the SOD activation of Hydrangea macrophylla, R~2 varied between 0.275-0.657, And in all of the seven cultivars' curve equations R~2<0.950, occupying 85.71%. The SOD activation of D was among the highest as well as the resistance to Al.In the curve equation of the changes of the POD activation of Hydrangea macrophylla, R~2 varied between 0.275-0.657, and all less than 0.950.The comprehensive analysis of the photosynthesis indexes through subordinate function showed that the Hydrangea macrophylla resistance to Al declined in the order:D> E> G> C>F>A>B.2 Effects of Al Stress on photosynthetic characteristics of Hydrangea macrophyllaThe result showed that in the change regulation of the photosynthetic characteristics of Hydrangea macrophylla, the related coefficients of the equation were small, only two in the effects of Ci on Hydrangea macrophylla cells were more than 0.95. A was the maximum, in which R~2=0.967, the curve equation was y=52.089x~2-273.51x+458.42. Therefore, with the concentration changes of the Al stress, the variations of each target in the photosynthetic characteristics of Hydrangea macrophylla were comprehensive and complex. The photosynthetic characteristic can only be used as an auxiliary target in the strength of the resistance of Hydrangea macrophylla. The comprehensive analysis of photosynthetic targets through principal component analysis and subordinate function showed that the resistance of Hydrangea macrophylla to Al stress declined in the order: A>D>B>G>F>E>C.
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