Morphological characteristics of leaf epidermis and chloroplast development in Viburnum macrocephalum f.keteleeri
Morphological characteristics of the leaf epidermis, epidermal hairs and chloroplast development were investigated by scanning and transmission electron microscopy. Epidermal hairs, ranging from a simple hair to multi-branched hairs, are distributed sparsely on the adaxial epidermis of leaves, whereas stellate hairs are distributed densely on the abaxial epidermis of leaves, especially on the leaf veins. In the cells of leaf buds, many proplastids develop into chloroplasts and during the proliferative stage chloroplasts replicate by budding and division. In the cells of mature leaves, chloroplasts are mainly plump or spherical in shape and distributed along the cell membrane. In the cells of senescing leaves, the chloroplast lamellar structures are degenerated but the chloroplast form and distribution change little because photosynthetic functions are retained up until leaf abscission. The epidermal hairs as a morphological character in plant taxonomy and the process of chloroplast development are discussed.
Viburnum macrocephalum f. keteleeriepidermal hairschloroplast developmentleaf development
NETL
NSTL
万方数据
维普
