Abstract: The long-term NaCl salt stress experiments showed that with the increasing of NaCl concentration, shoot and root biomass of different Bougainvillea cultivars were decreased. At 5% NaCl concentration, biomass of ‘Miss Manila’ had the least decline of 27.94%; however, ‘Imperial Delight’ had the largest decline of 67.03%, compared with the control. When the NaCl concentration was 4%, the quantum yield of ‘Imperial Delight’, ‘Shubhra’ and ‘Miss Manila’ were 0.36, 0.30 and 0.36, with 78.23%, 79.64% and 74.82% of the control, respectively; the quantum yield of ‘Thimma’ was 0.05, only 15.53% of the control. With the increasing of NaCl concentration, photochemical quenching coefficient qP of ‘Shubhra’ had no obvious change; but qP value of ‘Thimma’, ‘Miss Manila’ and ‘Imperial Delight’ decreased significantly. The resistance ability to NaCl salt stress of four Bougainvillea cultivars was ‘Shubhra’ > ‘Imperial Delight’> ‘Miss Manila’ > ‘Thimma’.

Key words: Bougainvillea, salt stress, chlorophyll fluorescence, growth

摘要： 长期盐胁迫处理实验表明，随着NaCl浓度增加，不同三角梅品种的地上部和地下部生物量均呈下降趋势。与对照相比，盐浓度为5%时，勤花三角梅生物量下降幅度最小，为27.94%；樱花三角梅下降最大，为67.03%。当盐浓度为4%时，樱花三角梅、白苞三角梅和勤花三角梅的光量子产量分别为0.36、0.30和0.36，分别为对照的78.23%、79.64%和74.82%；金心鸳鸯三角梅的光量子产量为0.05，仅为对照的15.53%。白苞三角梅的光化学猝灭系数qP值随着盐浓度的升高无明显变化；金心鸳鸯三角梅、勤花三角梅和樱花三角梅的qP值随着盐浓度的升高而降低。4个三角梅品种的抗盐胁迫能力为：白苞三角梅>樱花三角梅>勤花三角梅>金心鸳鸯三角梅。

关键词: 三角梅, 盐胁迫, 叶绿素荧光, 生长