凤仙花花药发育特征

凤仙花花药发育比较特殊: 在造孢细胞时期，花药横切面中央是体积较大、细胞内含物较多的细胞团、包括造孢细胞和绒毡层细胞。花药药壁细胞的细胞质较稀少，与中部细胞界限明晰。花粉母细胞时期的花药药壁由约6层细胞组成，但细胞的界限不明显；绒毡层细胞显示变形流入药室中。到四分体时期，绒毡层细胞进一步退化。开花时，成熟花药的药壁细胞由一层表皮细胞、两层药室内壁细胞和一层中层细胞组成。对凤仙花花药绒毡层的特殊性质进行了讨论。

The Character of Anther Development of Impatiens balsamina

The anther development of the Impatiens balsmina displayed some special characters. In sporogenous cell stage, there are some large sporogenous cells, containing density cytoplasm, locating in the central of anthers. The cells of anther wall contain less cytoplasm which makes both distinguish. In the stage of microspore mother cell, the anther wall consists of 6 layers of cells, but the limit line is not clear between the cells. The tapetal cells begin to display the degeneration at this time. In tetrad stage, the tapetal cells degenerate further as the cells become small. The mature anther wall consists of four layers of cells：one layer of epidermis, two layers of endothecium, and one layer of middle layer. The special characters of tapetal cells of Impatiens balsamina were discussed.