摘要
进行了水分胁迫下不同牧草品种的叶绿素荧光参数和净光合速率的变化与叶绿素、丙二醛(MDA)和脯氨酸(Pro)含量变化的对比研究,以探讨快速准确地评价引进的禾本科牧草品种的生理指标。研究结果表明,叶片的叶绿素荧光参数PSII原初光能转换效率(Fv/Fm)、PSII潜在活性(Fv/Fo)、光合量子产额(Yield)、光化学淬灭系数(qP)和净光合速率(Photo)值随水分胁迫强度增强而呈下降的趋势;而非光化学淬灭系数(qN)值是一个反映光能保护机制的参数,受胁迫时表现上升。上述参数的变化幅度因品种抗旱性强弱而异,这种差异可以作为简便的评价引进的禾本科牧草抗旱性强弱的诊断指标。
The variations of chlorophyII fluorescence parameters, net photosynthesis rate, chlorophyll, MDA and proline in 3 introduced grass varieties were investigated under water stress in order to screen physiological indexes for accurate and rapid assessment of their drought resistance. The results showed that with the increasing water stress, Fv/Fm, Fv/Fo, Yield, qP and Photo values decreased, while qN, which reflects the protective mechanism of light energy, increased significantly. The variances of chlorophyll fluorescence parameters and net photosynthesis rate were closely related to the drought tolerance of the forage varieties, suggesting that they could be used as the physiological indexes for simple and fast assessment of drought resistance in introduced grasses.
出处
《草业科学》
CAS
CSCD
2007年第5期53-57,共5页
Pratacultural Science
关键词
叶绿素荧光
净光合速率
禾本科牧草
引种
评价
Chlorophyll fluorescence
net photosynthesis rate
grass
introduction
assessment
