摘要
以"铁观音"和"福鼎大白茶"两个茶树品种为试验材料,研究水分胁迫对茶树叶片叶绿素荧光特性的影响。结果表明:水分胁迫下,茶树叶片的基础荧光(Fo)显著升高,最大荧光(Fm)、可变荧光(Fv)、PSⅡ原初光能转化效率(Fv/Fm)、PSⅡ的潜在活性(Fv/Fo)显著下降,表明水分胁迫使茶树叶片PSⅡ反应中心受到伤害;水分胁迫还可降低茶树的光化学反应速率(Prate),缩短荧光上升时间(T1/2),抑制PSⅡ反应中心电子的传递(ETR降低),导致天线色素热耗散速率(Drate)、非光化学猝灭(qN)和光合功能相对限制值(LPFD)升高,光化学猝灭(qP)和PSⅡ实际光化学效率(Yield)显著下降。比较水分胁迫下"铁观音"和"福鼎大白茶"叶片叶绿素荧光变化发现,"铁观音"PSⅡ反应中心的胁迫耐性较强,叶片光化学效率较高。
The effects of water stress on the chlorophyll fluorescence parameters in the leaves of "Tieguanyin" and "Fudingdabai-cha" tea cultivars were investigated.The results show that under water stress,the minimal fluorescence(Fo) of tea plants increases significantly,while the maximal fluorescence(Fm),variable fluorescence(Fv),light energy transformation efficiency of PS Ⅱ(Fv/Fm) and activity potential of PSⅡ(Fv/Fo) decrease markedly,suggesting that PS Ⅱ reaction center is destroyed by water stress.Photochemical reaction rate(Prate),fluorescence increment time(T1/2) and electron transport rate(ETR) decrease,leading to increased thermal dissipation rate(Drate),non-photochemical quenching(qN) and relative limitation of photosynthesis(LPFD),but obviously decreased photochemical quenching(qP) and actual photochemical efficiency of PSⅡ(Yield).The tea cultivar "Tieguanyin" has stronger stress tolerance and higher PSⅡ photochemical efficiency than "Fudingdabaicha".
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2009年第3期560-564,共5页
Chinese Journal of Eco-Agriculture
基金
福建省自然科学基金项目(B0510025)
福建省教育厅科技计划项目(JA05333)资助
关键词
茶树
水分胁迫
叶绿素荧光
光化学效率
Tea plant(Camellia sinensis),Water stress,Chlorophyll fluorescence,Photochemical efficiency