摘要
金叶女贞是一种在园林绿化上广泛应用的彩叶植物,上层叶金黄色,下层叶深绿色。本文利用常规植物制片技术,研究了叶绿素缺少的金叶女贞上层金叶和下层绿叶的解剖结构。结果表明:(1)金叶女贞上层金叶和下层绿叶的上表皮无显著差异,但是下层绿叶的下表皮细胞较小,气孔密度较低;(2)下层绿叶的叶肉组织较薄,细胞较大,排列疏松;(3)在下层绿叶中叶绿体类囊体片层排列密集,叶肉组织内单位体积叶绿体数量较少;(4)冠层部位对光合色素的积累有明显影响。叶绿素缺少的金叶女贞叶片结构显著受到冠层部位的影响,光合色素的变化幅度较一般植物更大,不同冠层部位叶片叶色有明显差异,可以作为研究植物冠层部位对叶形态、结构和生理生化影响的好材料。
Ligustrum×vicaryi is widely used as a landscaping shrub for horticultural ornamentation. It possesses leaves with two contrasting colors in the upper and lower positions. The upper leaves are golden while the lower leaves tend to be green during the whole growth season due to their positions. Light intensity may play a key role in generating these two types of leaves. In this paper, leaf anatomy in the upper golden leaves and lower green leaves was investigated. The results showed that light intensity did not affect the upper epidermis significantly; but under low light, the lower epidermis cells were smaller, and the stomatal density decreased. Mesophyll tissues in the lower leaves were thinner than those in the upper leaves, and the size of mesophyll cells increased and arranged loosely under low light. Thylakoids arranged more closely and the number of chloroplasts per leaf volume decreased under low light than those under high light. Low position promoted the accumulation of photosynthetic pigments and made leaves dark green. The effects of canopy position on leaf anatomy in the golden-leaf shrubs were similar to other plants, but the content of photosynthetic pigments varied more largely than other plants. Taken together, golden-leaf privet could be an ideal plant to study leaf morphology, structures, development, physiology and biochemistry responses to canopy position.
出处
《植物研究》
CAS
CSCD
北大核心
2014年第2期188-193,共6页
Bulletin of Botanical Research
基金
四川省教育厅青年基金项目(11ZB054)
关键词
金叶女贞
叶结构
叶绿素
冠层位置
Ligustrum
vicaryi
structure of leaf
chlorophyll
canopy position
