本文以湘研15号辣椒为材料, 研究了脱落酸(ABA)与镉(Cd2+)在辣椒果实不同发育时期对辣椒素和维生素C含量的影响, 并分析了处理后辣椒素、维生素C含量变化与POD活性以及叶片光合特征之间的关系。结果表明: 湘研15号辣椒植株经ABA与Cd2+处理后果实中辣椒素含量峰值分别比对照提高了80.4 %与61.4 %, POD活性均显著升高, 二者处理后辣椒果实中的辣椒素、POD变化趋势基本一致, 处理后叶片光合速率均有下降趋势。ABA处理后果实中维生素C含量在转色期比对照降低12.8 %~21.7 %, 叶片中叶绿素相对值显著增加; Cd2+处理后果实中维生素C含量在转色期比对照减少18 %~25 %, 红熟期减少13 %~26 %, 叶片叶绿素相对值在红熟期之前比CK显著降低。

The effects of ABA and Cd2+ on the content of capsaicin and vitamin C was studied in the fruits of pepper Xiangyan No.15 at different developmental stages and the relations between capsaicin, vitamin C in the treated plants and POD activity and photosynthetic rate were also studied. The results showed that each of the peak value of capsaicin increased 80.4 % and 61.4 % respectively in the fruits after ABA and Cd2+ treatment. The POD activity were enhanced significantly. The trend of capsaicin and POD activity were basically the same and the photosynthetic rate decreased after ABA and Cd2+ treatment. The content of vitamin C decreased 12.8 %~21.7 % during the turning stage after ABA treatment in the fruits, the SPAD value remarkablely increased. After Cd2+ treatment the content of vitamin C decreased 18 %~25 % during the turning stage and 13 %~26 % during the red stage in the fruits, the SPAD value remarkablely decreased before the red stage.