作 者 ：LIU Wen-Zhe, HU Zheng-Hai
期 刊 ：植物分类学报 1998年 2期
Keywords:Rutaceae, Secretory cavities, Comparative anatomy,
Abstract:
Comparative observations were made on the morphology and anatomy of secretory
cavities in leaves of 22 genera, 40 species and two varieties by the whole mounting, paraffin
and thin section method. A mature cavity consists of one layer of epithelial cells surrounding
a large intercellular space and one to five layers of peripheral sheath cells. The epithelial cells
were flattened, thin-walled and integrated, which suggests that the cavities developed
schizogenously. The sheath cells were also flattened. The cell walls of the outer layers had
relative thickenings. The number of layers of the sheath cells varied with species. A few of
species appeared to lack the sheath cells. The localization and structure of the cavities were
correlated with taxa at generic and specific level. According to their structural features and
arrangement in leaves, the secretory cavities can be grouped into four types as follows: the
notch type (between the leaf-teeth), the mesophyll type which is subdivided into spongy
parenchyma subtype and palisade parenchyma subtype, and the mixed type (with both notch
and mesophyll cavities). Based on these observations evolutionary trends concerning the mor-
phology and anatomy of cavities and affinity among subfamilies or genera are discussed. It is
suggested that the mixed type of cavities developed from the notch and mesophyll types.