烏藥之小孢子發生

Microsporogenesis in Lindera aggregata Kosterm

呂志怡(Chi-Yi Lu) ； 南珈合(Chia-Ho Nan) ； 羅漢強(Hann-Chung Lo)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 22卷4期 (2008/12) Pp. 229-240

https://doi.org/10.6542/EFNTU.200812_22(4).0002

摘要

烏藥(Lindera aggregata Kosterm)在台灣屬稀有樹種，具有單性的花及雌雄異株。雄花序原體約在八月中旬於葉腋處出現。十月中旬時花藥原體形成。花藥具二個小孢子囊。花藥壁層之構造包含表皮層、一層內壁層、兩層中間層和一層營養層，發育過程屬基本型。營養層細胞屬類變形蟲型。小孢子母細胞約在11月上旬行減數分裂，細胞質次第分裂，大多數產生兩側對稱排列的四分體小孢子，稀少為四面體排列。成熟花粉粒具二細胞，直徑約二十二至二十五微米。三月開花時花藥瓣裂，花粉粒散發。

關鍵字

烏藥 ； 小孢子發生

並列摘要

Lindera aggregata Kosterm is a rare species in Taiwan. Flowers are unisexual and dioecious. Axillary inflorescence primordia are initiated in mid-August and anther primordia in staminate flowers are developed in mid-October. The anther is bisporangiate. The wall layers of anther consist of one epidermis layer, one endothecium layer, two middle layers and one tapetum layer, and this anther wall formation pattern belongs to the Basic type. The tapetum is the typical amoeboid type. Microspore mother cells undergo meiosis through successive cytokinesis in early November and give rise to tetrads of microspores, which are mostly isobilaterally arranged and rarely tetrahedrally. Mature pollen grains are 2-celled and about 22-25 μm in size. Anthers dehisce with valves and pollen grains are shed in March.

並列關鍵字

Lindera aggregata Kosterm ； Microsporogenesis