为研究干旱对谷子叶绿素荧光参数的影响,以4个品种谷子幼苗为研究材料,采用盆栽控水的方法进行干旱胁迫,处理30天后测定谷子幼苗的叶绿素含量、鲜重、叶绿素荧光动力学参数。结果表明,干旱处理下谷子的鲜重、叶绿素含量均下降。初始荧光(Fo)和非光化学淬灭系数(NPQ_Lss)表现为上升,而最大荧光(Fm)、可变荧光Fv、光系统II (PSII)潜在光化学效率(Fv/Fo)、PS II最大光化学效率(Fv/Fm)、以吸收光能为基础的光合性能指数PIABS则表现为降低。4个品种变化幅度不同,抗旱性强的品种NPQ_Lss升高幅度大,其它指标为抗旱性弱的品种变化幅度大。4个品种的抗旱性顺序为:衡谷13号 > 冀谷19 > 豫谷18 > 衡谷18号。
In order to study the effects of drought on the chlorophyll fluorescence parameters of millet, four varieties of millet seedlings were used as research materials. The drought stress was applied by potted water control method. The fresh weight, chlorophyll content and chlorophyll fluorescence kinetic parameters were determined after 30 days of treatment. The results showed that the fresh weight and chlorophyll content of millet decreased under drought treatment. The initial fluorescence (Fo) and non-photochemical quenching coefficient (NPQ_Lss) showed an increase, while the maximum fluorescence (Fm), variable fluorescence (Fv), photosystem II (PSII) potential photo-chemical efficiency (Fv/Fo), PSII maximum photochemical efficiency (Fv/Fm), the photosynthetic performance index PIABS based on absorbed light energy, showed a decrease. The variation range of the four varieties was different. The NPQ_Lss of the drought-tolerant varieties increased greatly, and the other indicators showed a large variation of the varieties with weak drought resistance. The order of drought resistance of the four varieties is: Henggu 13 > Jigu 19 > Yugu 18 > Henggu 18.