The Morphological Anatomy And Phenomenon Of Programmed Cell Death During The Development Of Leaf Of Three Cyperaceae Plants

This paper studied on the developmental and morphological anatomy structure and the programmed cell death of leaves of Carex atrofusca, Carex orbicularis and Blysmus sinocompressus by using light and electron microscope. The results as follows:1. In the transverse section, the morphological anatomy structure of leaves of Carex atrofusca, Carex orbicularis and Blysmus sinocompressus was evidently composed of epidermis, veins, mesophyll tissue and ventilating structure. The blades of Carex atrofusca and Carex orbicularis were V-shaped and that of Blysmus sinocompressus was crescentiform.2. The cells walls of both epidermal cells of three plants showed sinuate. The sizes of upper epidermal cells were bigger than that of lower epidermis. The bulliform cells were situated in groove of upper epidermis facing the main vein. The stomatal apparatuses were all hemiparacytic types. There were siliceous papillae on the all above lower epidermal cells of Carex atrofusca and Carex orbicularis, which was leaning toward the same direction in the Carex orbicularis, while both epidermal cells of Blysmus sinocompressus had no one. The stomatal apparatuses of Carex orbicularis were distributed on both epidermal cells, while to Blysmus sinocompressus and Carex atrofusca,which were only on the lower epidermal cells.3. The mesophyll cells of Carex atrofusca , Carex orbicularis , and Blysmus sinocompressus had no differentiations between palisade tissue and spongy tissue. The mesophyll cells contained idoblast. The vascular bundle sheath consisted of two layers of cells: the outer layer was bigger parenchyma cells, and the inner layer was composed of minor sclerenchyma cells. The model of the cell wall was U- shaped incrassation in the transverse section. The mechanical tissue was flakily situated in the upside and downside of mostly vascular bundles. There was an air-cavity among the neighboring vascular bundles forming well developed ventilating structure in the mature leaf. The area of air-cavity occupied 30%~40%, 50% and 60% of the area of the whole leaf respectively.4. The idioblast went through three processes including differentiation, development and...