干旱胁迫下三种三角梅的生理反应

该研究对勤花三角梅(Bougainvillea buttiana‘Miss Manila’)、樱花三角梅(B.glabra‘Imperial Delight’)和金心鸳鸯三角梅(B.peruviana‘Thimma’)三个三角梅品种的幼苗进行人工干旱胁迫,分析了干旱胁迫对三角梅品种的外观形态和生理生化水平的影响,探讨了不同品种三角梅对干旱胁迫的适应能力。结果表明:随着干旱时间的延长,三角梅品种的叶片出现下垂、皱缩、变黄、脱落,最后植株死亡;过氧化物酶POD活性先升高后降低,而超氧化物歧化酶SOD活性则逐渐降低,降低速度因品种而异;qP值降低、qN值升高、PSⅡ反应中心光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)均呈现降低。该研究结果为三角梅的栽培应用和品种选择提供了依据。

Physiological responses of three cultivar seedlings of Bougainvillea under drought stress

Seedlings of Bougainvillea buttiana'Miss Manila' , B. glabra'Imperial Delight' and B. peruviana 'Thim-ma' were treated to study the physiological responses under drought stress. The results showed that the plant leaves be-gan to droop, gradually shrink, yellow in color, and fell off, all of the treatment seedlings died finally under the long drought. The results showed that the peroxidase activities ( POD) were increased at beginning, and decreased finally, while the superoxide dismutase ( SOD) activities were gradual decreased, but the reduction rates were different in the three cultivar seedlings. The research on chlorophyll fluorescence parameters showed that qP value was decreased, while qN value was increased, and the photochemical efficiency of PSⅡreaction center (Fv/Fm) and potential activity of PSⅡ( Fv/Fo) were decreased under drought stress. This study provides information for breeding application and choosing ulltivars of Bougainvillea.