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在低温胁迫下采用不同浓度的稀土喷施叶面,研究稀土对麻楝幼苗的抗寒性的影响。结果表明:麻楝幼苗的相对电导率在300 mg·L~(-1)稀土处理后有所增加,700～1 500 mg·L~(-1)处理组均显著下降或相对稳定。不同稀土浓度处理的麻楝幼苗的脯氨酸含量有不同程度的增加,可溶性蛋白质含量保持稳定或小幅增加,叶绿素含量增加或显著增加,SOD活性保持稳定。300 mg·L~(-1)稀土喷施叶面使幼苗的丙二醛含量增加,而700～1 500 mg·L~(-1)稀土处理使丙二醛含量先有所增加,然后减少或显著减少。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1 500mg·L~(-1)稀土处理后幼苗抗寒性最佳,其次是1 000和700 mg·L~(-1)处理。
The effects of rare earth on the cold resistance of Jatropha curcas seedlings were studied by spraying different concentrations of rare earth under low temperature stress. The results showed that the relative conductivity of Jatropha curcas seedlings increased after 300 mg · L -1 rare earth treatment, while the treatment of 700-1 500 mg · L -1 significantly decreased or remained relatively stable. The contents of proline in different seedlings treated with different concentrations of rare earth increased to some extent, the content of soluble protein remained stable or slight increase, chlorophyll content increased or significantly increased, SOD activity remained stable. The content of malondialdehyde (MDA) in seedlings increased with the spraying of 300 mg · L -1 rare earth, and the content of MDA increased first and then decreased with 700 ~ 1500 mg · L -1 rare earth treatment Or significantly reduced. The principal component analysis was conducted to evaluate the cold resistance of seedlings treated with different concentrations of rare earth. The results showed that the cold resistance of seedlings treated with 1 500 mg · L -1 rare earth is the best, followed by 1 000 and 700 mg · L ~ (-1) 1) Processing.