铝胁迫对辣椒培养液及叶片的影响

Influence of Aluminum Stress on Pepper Nautrient Solution and Leaf

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 is the main factor which affects plant growth on acidic soil.Four different concentration of aluminum processing and two controls were set up in this study.The effects of aluminum stress on pepper broth,chlorophyll and chlorophyll fluorescence parameters were studied.More theory of aluminum stress mechanism to hot pepper were expected to provide.The results showed that,under acid and aluminum stress condition,OH^- released by pepper plants could significantly improve the pH of nutrient solution.With the increase of aluminum concentration,the increase degree of pH decline and OH- emission decrease.Low concentration of aluminum treatment did not affect the synthesis of chlorophyll a,but could affect the synthesis of chlorophyll b.When the aluminum concentration reached 500μmol·L-1,chlorophyll a＋b content and chlorophyll a/b decreased.Chlorophyll fluorescence parameters displayed that Fo increased with the increase of aluminum concentration,Fm decreased with the increase of aluminum concentration.Fv/Fm and Fv/Fo decreased with the increase of aluminum concentration.There was no significant difference in the effects of aluminum stress on the aboveground and underground part of pepper plants.