Abstract: Seed morphology was observed and effects of substance types, light, destroying the endocarp artificially and gradient pH on germination percentage of the species, N. yunnanensis, were investigated . The results showed that the average seed size with endocarp was 0 . 94 cm×0. 52 cm×0. 17 cm ( length×width×thickness) , per-thousand-seed-weight about 234.3 g , with germination valve. Among the three substance types, laterite humus soil􊄯peat (v􊄯v􊄯v , 1∶1∶1) was better for N. yunnanensis . Seeds could germinate in the both light and dark , the germination rate can be increased by destroying the endocarp artificially obviously, and the seed germination of N. yunnanensis was stunted by treated in lye , however , that of N. sinensis was promoted . Besides, the rarity causes of N. yunnanensis were discussed in this paper .

Key words: Nyssa yunnanensis

摘要： 观察了云南蓝果树( Nyssa yunnanensis) 种子的形态, 并初步研究了萌发基质、光照、人工破坏内果皮和pH 梯度碱液处理对云南蓝果树种子萌发的影响。结果表明: 云南蓝果树种子(带内果皮) 平均大小为0 . 94 cm×0 . 52 cm×0 . 17 cm (长×宽×厚) , 千粒重约234 .3 g , 有萌发瓣; 红土􊄯腐殖土􊄯泥炭土( v􊄯v􊄯v , 1∶1∶1) 为云南蓝果树种子萌发的适宜基质; 种子在光、暗条件下都能萌发; 人工破坏内果皮能明显地提高种子的萌发率; 碱液处理对云南蓝果树种子的萌发有抑制作用, 但对中国蓝果树( N. sinensis) 种子的萌发有促进作用。本文还对云南蓝果树的致濒原因进行了讨论。

关键词: 云南蓝果树, 极度濒危, 种子形态, 种子萌发, 致濒原因FONT