8种园林彩叶植物叶片显色部位分析

[目的]研究阳生植物羽衣甘蓝、花叶扶桑、红花檵木、细叶变叶木及阴生植物紫背万年青、紫背竹芋、红背桂和白蝶合果芋共8种彩叶植物的叶片结构及其显色部位,为探索园林彩叶植物的显色特性和呈色机理提供理论依据.[方法]取上述8种植物的新鲜叶片作为材料,用FAA固定后制作叶片结构的临时切片,显微观察摄影并分析.[结果]红背桂、花叶扶桑、羽衣甘蓝、紫背万年青、紫背竹芋这5种植物的显色部位在叶表皮中;细叶变叶木、红花檵木和白蝶合果芋这3种植物的显色部位在叶肉的栅栏组织或海绵组织中.[结论]阴生植物和阳生植物的显色部位类似,色素存在于叶表皮或叶肉组织中,因此不能以生态习性的类型作为判断彩叶植物显色表达的依据.

Coloration tissue analysis of leaf color in eight garden colored-leaf plants

【Objective】The purpose of this experiment was to study leaf structure and coloration tissue location of heliophyte including Hibiscus rosa-sinensis var. variegata，Codiaeum variegatum var. pictum，Brassica oleracea var. acephala and Loropetalum chinense Olive var. rubrum Yieh，and shade plants including Syngonium podophyllum cv. ‘White Butter-fly’， Rhoeo discolor Hance， Stromanthe sanguinea Sond and Excoecaria cochinchinensis Lou. 【Method】After fixed with FAA， the fresh leaves were made into temporary slices to observe under microscope and photographed. 【Result】The coloration tissue of Excoecaria cochinchinensis Lour， Hibiscus rosa-sinensis var. variegata， Brassica oleracea var. acephala， Rhoeo discolor Hance and Stromanthe sanguinea Sond existed in leaf epidermis， and Codiaeum variegatum var. pictum， Loropetalum chinense Olive var. rubrum Yieh， and Syngonium podophyllum cv. ‘White Butter-fly’ existed in palisade tissue or spongy tissue of mesophyll. 【Conclusion】In summary， heliophyte and shade plants had similar coloration tissue with pigment in leaf epidermis or mesophyll tissue. Ecological characteristics were not the sole indicator for color expression in the color-leafed plants.