“藏茵陈”——川西獐牙菜的大孢子发生及雌配子体发育(英文)

Megasporogenesis and female gametogenesis deve-lopment of the Tibetan medicine "Zang Yin Chen"——Swertia mussotii (Gentianaceae)

首次报道了藏茵陈川西獐牙菜的大孢子发生及雌配子体发育。川西獐牙菜为倒生胚珠 ,薄珠心 ,单珠被 ,线形大孢子四分体 ,胚囊发育为蓼型 ,反足细胞分裂为 5～ 8个 ,宿存 ,每个细胞均异常膨大 ,并多核。反足细胞在龙胆科一些一年生高山植物中的宿存和分裂具有重要的生殖适应和进化意义 ,这对于这些植物在青藏高原严酷的自然环境下 。

The present paper firstly reports the development of megasporogenesis, female gametophyte in Swertia mussotii , a famous Tibetan medicine. The ovule is anatropus, tenuinucellate, initegmic, the megaspore tetrad is linear and embryo sac development is of the Polygonum type. The three antipodal cells can be divided into 5～8 cells with enlarged and polyploid nuclei. The dividing and persisting of the antipodal cells in alpine annual Gentianaceae plant are of significance in reproductive adaptation and evolution, which is important for those ephemeral species of Gentianaceae to complete their life cycle under the arid surrounding of Qinghai Xizang plateau within a few weeks' growing season.