金叶植物色素含量对光强的响应

Response of Pigment Content of Golden-leaf Plants to Light Intensity

以14种金叶植物为试材,测定了各自的光饱和点、光补偿点,分析了叶片中的色素组成及含量,同时探讨了叶片色素变化对光照强度的响应。研究结果显示:供试金叶植物叶片的总叶绿素含量(Chl·)普遍偏低,叶绿素/类胡萝卜素(Chl·/Car·)比值低于绿叶植物;同一枝条随着叶位的降低,Chl·和Chl·/Car·值均呈上升趋势,叶色加深。金叶植物的叶色表达受环境光强影响,在强光下叶色金黄,弱光下由于叶绿素含量增加,导致叶色转变为黄绿。根据叶片色素变化对光强响应的敏感程度,将供试金叶植物分为光强不敏感型、光强敏感型、光强高度敏感型3类:光强不敏感型的有金叶红薯和金叶绿萝,光强敏感型的有金叶珊瑚朴、金叶皂荚、金叶国槐、金叶风箱果、金叶红瑞木、金叶女贞、金山绣线菊、金叶小檗,光强高度敏感型有金叶接骨木、金叶莸、金叶连翘。

In this paper, light saturation point and light compensation point, pigment content in leaf, the response of leaf color to environmental light intensity on 14 kinds of golden-leaf plants were measured. The resuhs showed that the chlorophyll content and ratio of Chl./Car. of golden-leaf plants increased with the descending leaf position and the leaf color of most golden-leaf plants was affected by environmental light intensity. The golden leave turned green and the content of chlorophyll increased with the decrease of light intensity. According to the sensitivity of leaf color to light intensity, these plants were divided into three types, namely light insensitivity, light sensitivity and highly light sensitivity. The light insensitivity type includes lpomoea batatas ‘ Aurea’ and Epipremnum aureum. The light sensitivity type includes Celtis julianae‘ Aurea’ , Gleditsia triacanthos ‘ Sunburst’ , Sophora japonica ‘ Aurea’ , Physocarpus opulifolius ‘ Aurea’ , Comus alba ‘ Aurea’ , Ligustrum lucidum ‘Aurea’ , Spiraea bumalda ‘ Goldmound’ , Berberis thunbergii ‘Aurea’ , and the highly light sensitivity type includes Sambucus glauca ‘Aurea’, Caryopteris × Clandonensis ‘Worcester Gold’ , Forsythia koreana ‘Suwon Gold’.