关键词: 三角梅, 盐胁迫, 叶绿素荧光, 生长

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