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在同一生长环境下,测定两种分布在不同海拔的圆柏属植物叶绿素荧光参数的季节变化,探讨二者光合特征的季节变化模式和差异,研究结果表明,祁连圆柏(Sabina przewalskii Kom.)和圆柏(Sabina chinensis(Lin.)Ant.)的最大光化学效率(Fv/Fm)、有效光合效率(F′v/F′m)、光化学淬灭系数(qP)、非光化学淬灭系数(qN)、电子传递速率(ETR)和有效量子产量(Yield)有相似的季节变化模式,均表现为冬季低,夏季高。两种测试植物叶绿素荧光参数之间差异显著(p<0.05),祁连圆柏叶片的Fv/Fm、F′v/F′m、qP、qN、ETR和Yield均显著高于圆柏。可见分布在较高海拔的祁连圆柏的光合潜能高于低海拔的圆柏,祁连圆柏应对低温诱导有更广泛的调节能力,同时证实叶绿素荧光技术可作为衡量抗寒性强弱和叶片光合特性季节变化的有效手段。
In the same growth environment, the seasonal variation of chlorophyll fluorescence parameters of Sabina przewalskii Kom. And Sabina przewalskii Kom. Under two altitudinal distributions were determined. The seasonal variations of photosynthetic characteristics of the two Sabina przewalskii Kom. The maximum photochemical efficiency (Fv / Fm), effective photosynthetic efficiency (F’v / F’m), photochemical quenching coefficient (qP) and non-photochemical quenching coefficient (qN) of Sabina chinensis (Lin.) Ant. ), The ETR and the effective quantum yield have similar seasonal variation patterns, both of which show low winter and high summer. The chlorophyll fluorescence parameters of the two tested plants differed significantly (p <0.05). The Fv / Fm, F’v / F’m, qP, qN, ETR and Yield of Sabina przewalskii were significantly higher than those of Sabina przewalskii. It can be seen that the photosynthetic potential of Sabina przewalskii distributed in higher altitudes is higher than that in low altitude, and the pollen of Sabina przewalskii should be more broadly regulated by low temperature induction. It is also confirmed that chlorophyll fluorescence technique can be used as a measure of cold resistance and photosynthetic characteristics Effective means of change.