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以麻楝袋装实生苗为材料,叶面喷洒稀土后放入人工气候箱进行低温处理,测定其生理指标,并用主成分分析比较不同浓度稀土对幼苗抗寒性的综合影响。结果表明,0-300 mg·L-1稀土处理的幼苗相对电导率和脯氨酸含量波动,可溶性蛋白质含量多为下降,叶绿素含量保持稳定,SOD活性和MDA含量多保持稳定。500-1 000mg·L-1稀土处理的幼苗相对电导率下降,脯氨酸含量小幅增加,可溶性蛋白质含量保持稳定或小幅下降,叶绿素含量普遍小幅增加,SOD活性多保持稳定,MDA含量减少或保持稳定,表明高浓度稀土处理有效提高了苗木的抗寒能力。用主成分分析对各浓度稀土处理的幼苗抗寒性进行评价,得出处理幼苗的稀土浓度对幼苗抗寒排序为1 500mg·L-1>1 000 mg·L-1>700 mg·L-1>500 mg·L-1>300 mg·L-1>100 mg·L-1>50 mg·L-1>0 mg·L-1。
The seedlings of Melia tomentosa were used as materials. The leaves were sprayed with rare earth and placed in artificial climate chamber for low temperature treatment. The physiological indexes of the seedlings were determined. The principal components analysis was used to compare the effects of different concentrations of rare earth on cold resistance of seedlings. The results showed that the relative conductivity and proline content of 0-300 mg · L-1 rare earth seedlings fluctuated with soluble protein content decreasing, chlorophyll content stable, and SOD activity and MDA content remained stable. The relative conductivity of 500-1000mg · L-1 rare earth seedlings decreased, proline content increased slightly, soluble protein content remained stable or slightly decreased, chlorophyll content generally increased slightly, SOD activity remained stable, MDA content decreased or maintained Stable, indicating that the high concentration of rare earth treatment effectively improve the cold tolerance of seedlings. The cold resistance of the seedlings treated with different concentrations of rare earths was evaluated by principal component analysis. The results showed that the cold tolerance of the seedlings treated with rare earth concentration of 1 500 mg · L-1> 1 000 mg · L-1> 700 mg · L- 1> 500 mg · L -1> 300 mg · L -1> 100 mg · L -1> 50 mg · L -1> 0 mg · L -1.