遮荫条件下雪茄外包烟叶成熟过程中的叶绿素荧光特征

The Characteristic of Chlorophyll a Fluorescence to Cigar Wrapper Tobacco During Maturing Under the Condition of Shading

通过测定分析雪茄外包烟烟叶成熟过程中的叶绿素荧光参数,探讨了其叶绿素荧光变化特征,结果表明, 遮荫条件下雪茄外包烟烟叶成熟过程中光合系统Ⅱ的最大光化学效率、潜在活性均下降,qP呈双峰曲线变化,NPQ则随着叶片的衰老逐步下降;而叶片的光合电子传递速率和光量子产量也呈双峰曲线变化。成熟后期,qP、叶片的光合电子传递速率和光量子产量仍较大。

Changes of chlorophyll a fluorescence parameters of cigar wrapper tobacco during maturing under the condition of shading were measured to analysis the characteristic of them. The results indicated that： the biggest efficiency of photochemistry and potential activity of PS Ⅱ were decreased; the changes of qP presented a bimodal curve; NPQ were decreased progressively with,the aging of the blade; shut electron transmit speed and light quantum yield presented bimodal curve too. At the late stage of maturity, qP, shut electron transmit speed and light quantum yield were still high.