青剛櫟之小孢子發生

Microsporogenesis in Cyclobalanopsis glauca (Thunb.) Oerst

羅漢強(Hann-Chung Lo) ； 黃子銘(Tzu-Ming Huang)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 19卷1期 (2005/03) Pp. 55-68

https://doi.org/10.6542/EFNTU.200503_19(1).0005

摘要

青剛櫟【Cyclobalanopsis glauca (Thunb.) Oerst.】是雌雄異株的常綠闊葉樹種。於三月上旬，幼雄葇荑序已具雄花原體，在一年生條枝之芽體內形成。稍後，幼花藥分化出原始表層、基本分生組織及原始形成層；每一枚花藥很快發育出四個小孢子囊；三月中旬，花藥壁層發育完全，具表皮層、內壁層、兩層中間層及絨氈層。三月下旬，小孢子母細胞行減數分裂，經過細胞質同時分裂，產生四面體形的小孢子四分體。成熟花粉粒含兩細胞。四月中旬花藥開裂，花粉粒散發。

關鍵字

青剛櫟 ； 小孢子發生

並列摘要

Cyclobalanopsis glauca (Thunb.) Oerst. is a species of evergreen. broadleaved and dioecious trees. Male catkins with floral primordia are formed in the buds of one-year old shoots in early March. Later, a protoderm, ground meristem and a procambium have differentiated in young anthers. Each young anther soon develops to four microsporangia. The anther wall layers develop completely by mid-March and consist of one-cell-layered epidermis, one-cell-layered endothecium, two middle layers and one-cell-layered tapetum. Microspore mother cells undergo meiosis through simultaneous cytokinesis in late March and give rise to tetrads of microspores, which are tetrahedrally arranged. Mature pollen grains contain 2 cells. Anthers are dehiscent and pollen grains shed by mid-April.

並列關鍵字

Cyclobalanopsis glauca (Thunb.) Oerst. ； microsporogenesis