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铝胁迫是酸化土壤植物生长障碍的主要因子,以“汴椒1号”辣椒为试材,设置4个不同铝浓度处理和2个对照,研究了铝胁迫对辣椒培养液、叶绿素含量及叶绿素荧光参数变化的影响,以期为辣椒铝胁迫机制提供参考。结果表明:在酸铝胁迫条件下,辣椒植株可以释放OH~-,显著提高营养液pH,随铝处理浓度的增加,其pH增幅下降,OH~-释放量下降;低浓度铝处理不影响叶绿素a的合成,但能影响叶绿素b的合成,铝浓度500μmol·L~(-1)时叶绿素a+b含量及叶绿素a/b比值降低;叶绿素荧光参数显示Fo随铝浓度的升高而升高,Fm随铝浓度的升高而降低,Fv/Fm与Fv/Fo随铝处理浓度的增加而降低;该研究中,铝胁迫对辣椒植株地上部与地下部干质量的影响无差异显著性。
Aluminum stress was the main factor of plant growth retardation in acidified soils. Four different aluminum concentration treatments and two control treatments were set up with “Jiaojiao 1 ” as test material. The effects of aluminum stress on the contents of chlorophyll, Chlorophyll fluorescence parameters changes in order to provide a reference for the mechanism of pepper aluminum stress. The results showed that under the condition of aluminum and aluminum stress, pepper plants could release OH ~ - and significantly increase the pH of nutrient solution. With the increase of aluminum concentration, the increase of pH decreased and the amount of OH ~ - release decreased. Low concentration of aluminum treatment did not affect chlorophyll a, but could affect the synthesis of chlorophyll b. The content of chlorophyll a + b and the ratio of chlorophyll a / b decreased when the concentration of aluminum was 500 μmol·L -1. The chlorophyll fluorescence parameters showed that Fo increased with the increase of aluminum concentration , Fm decreased with the increase of Al concentration, while Fv / Fm and Fv / Fo decreased with the increase of Al concentration. In this study, there was no significant difference in the effects of Al stress on dry weight of shoots and shoots.