不同叶龄草莓叶片光合能力比较研究

Comparative Study of Strawberry(Fragaria ananassa Duchesne) Leaves Photosynthetic Capacity at Different Ages

[目的]探索不同叶龄"章姬"草莓(Fragaria ananassa Duchesne)叶片的光合特性,为该品种在保护地条件下的高产优质栽培提供理论依据。[方法]对"章姬"草莓在设施条件下的光合参数进行测定,并对其叶绿素含量进行了比较研究。[结果]草莓的光合速率在一天当中大致呈正弦曲线。在晴天中午时新叶的"午休"比中部和内膛叶片明显。不同叶龄叶片对光照的响应趋势基本一致,光照越强,光合速率越大,功能叶片在高光强下的光合速率明显大于新生叶和老叶。白天功能叶片的平均光合速率为7.93μmol/(m2.s),新叶为5.24μmol/(m2.s),老叶为3.54μmol/(m2.s)。功能叶片的叶绿素含量多,这与其较强的光合能力相一致。[结论]功能叶的光合能力大于新叶和老叶。

[ Objective] The essay aims to find out the photosynthetic characteristics of Zhangji strawberry leaves at different ages,and provide a theoretical basis for its high yield and good quality cultivation in protective cultivation. [ Method] The photo synthetic parameters of Zhangji Strawberry in facility environment were determined ,and the amount of chlorophyll in the leaves was compared. [ Result] The results showed the photosynthetic rate of strawberry leaves appeared to be a sine wave in one day. At noon,the ＂nap＂ of new leaves was more obvious than that of the other leaves. The response trend of photosynthesis of leaves with different folia ages was more or less the same,in other words ,the brighter the sun- shine was, the bigger the photosynthetic rate was. According to the result, the photosynthetic rate of function leaves in brighter sunshine was obviously bigger than that of new or older leaves. The average photosynthetic rate of function leaves in the daytime was 7.93 μmol/（ m2 · s） ,and the new leaves was 5.24 μmol/（ m2 · s）, while the older leaves was 3.54 μmol/（ m2 · s）. The amount of chlorophyll of function leaves was more and consistene with its strong photosynthetic capacity. [ Conclusion] The photosynthetic capacity of function leaves is bigger than that of new leaves and older leaves.