氟铝互作对茶树叶片叶绿素荧光特性的影响

为明确氟和铝对茶树Camellia sinensis (L.) O. Kuntze]叶片叶绿素荧光特性的影响,采用盆栽沙培的方法,设置不同浓度氟和铝互作处理,采用调制叶绿素荧光仪对其荧光各参数进行分析,结果发现,茶树幼苗在未添加铝的情况下,随着氟浓度的增加,PSⅡ的实际光化学量子效率Y(Ⅱ)、最大荧光（F_m）、最大光化学效率（F_v/F_m）、光化学淬灭系数（qP和qL）降低。最小荧光F_o、非光化学淬灭系数（NPQ和qN）、PSⅡ调节性能量耗散的量子产额Y(NPQ)增加;在低铝水平下,随着氟浓度的增加,F_m、F_v/F_m、Y(Ⅱ)、NPQ和qN等值降低,而qP和qL升高,F_o、Y(NO)和Y(NPQ)值未达显著差异水平;在高铝处理下,随着氟处理浓度的增加,F_o逐渐增加,Y(Ⅱ)、F_v/F_m、qP值下降,Y(NPQ)和NPQ值在低氟时（100βmg·L^-1）显著升高。可见,当受到氟胁迫时,茶树叶片光合效率会降低;添加铝可以减轻对植株造成的伤害,在低铝水平下,对提高叶片光合效率的作用更加明显。

Effect of Fluoride and Aluminum Interaction on the Chlorophyll Fluorescence Characteristics of Tea Leaves

To study the effect of fluoride and aluminum intertreatment on the chlorophyll fluorescence characteristics of tea leaves, different concentrations of fluorine and aluminum were used and the fluorescence parameters were analyzed by modulated chlorophyll fluorescent instrument. The results found that: the actual photosynthetic efficiency Y(Ⅱ), the maximum (F_m), primary maximum photochemical efficiency of PSⅡ such as F_v/F_m and coefficient of photochemical quenching such as qP and qL of tea seedlings decreased with the increase of fluorine concentration without aluminum. But the non-photochemical quenching coefficients (NPQ), F_o, non-photochemical quenching coefficient (NPQ and qN) and PSII regulated energy dissipation increased. At low aluminium levels, F_m, F_v/F_m, Y(Ⅱ), NPQ and qN decreased with the increase of fluorine concentration, while qP and qL increased. There were no significant differences between the F_o, Y(NO) and Y(NPQ) values at this time. Under high aluminium treatment, with the increase of fluorine treatment concentration, the F_o gradually increased, Y(Ⅱ), F_v/F_m, qP decreased, Y(NPQ) and NPQ increased significantly under low fluorine concentration (100βmg·L^-1). In short, for tea trees under fluorine stress, aluminum could reduce the damage to tea plants, especially under low aluminum level. The improving effects of photosynthetic efficiency were more obvious.