低温对花芽分化期辣椒生产性状及其生理生化效应的影响

研究花芽分化期低温对辣椒生产性状及叶绿素相对含量、相对电导率、保护酶活性等生理生化指标的影响，揭示低温胁迫与辣椒花芽分化及相关生理生化指标之间的关系，为确定辣椒的寒害温度提供参考。以广州地区的3个辣椒生产品种为实验材料，在花芽分化期利用梯度降温和两段降温两种方式对辣椒进行低温处理。与对照相比低温胁迫使辣椒始花节位降低，始花花期缩短，结果数、单果重、单株产量减少，结果数下降幅度最大；SPAD值降低，且上位叶的SPAD值降低比较显著；相对电导率升高，Pro含量、MDA含量、可溶性糖浓度增加，SOD活性和POD活性降低。处理的温度越低，对辣椒的影响越明显。其中‘中椒4号’的耐低温能力最强，‘红龙’的抗寒能力最弱。相同低温时两段比梯度处理方式对辣椒的影响显著。在13℃/3℃梯度低温时，供试3个品种辣椒均没有完全停止生长，与一般认为的辣椒在5℃时就完全停止生长不一致，因此建议调低辣椒的生长极限温度。

Effects of Low Temperature Stress on Production Traits and Physiological Characters of Capsicum annuum L. in Flower Bud Differentiation Stage

It was studied that the effects of low temperature stress on production traits and associated physiological characters of three cultivars of peppers (Capsicum annuum L.).The aims were to reveal the relationship between flower bud differentiation and cold tolerance of three cultivars.The experiment was conducted in three production variety of Capsicum in Guangzhou,under low temperature treatment by gradient cooling in the stage of flower bud differentiation stage.The results showed that low temperature stres...