紫花醉鱼草(Buddleja fallow iana Balf.f.et W.W.Smith)种子萌发条件的研究  

Requirements of Seed Germination of Buddleja fallowiana Balf.f.et W. W. Smith

作　　者：孙卫邦[1] 孔繁才[1] 

机构地区：[1]中国科学院昆明植物研究所,昆明650204

出　　处：《种子》2002年第6期8-9,21,共3页Seed

基　　金：中国科学院知识创新工程西南基地创新基金资助 (KZ:I- 2 9)

摘　　要：紫花醉鱼草是主要分布于云南西北部海拔 2 70 0～ 380 0 m的一种野生观赏灌木 ,其种子长圆形 ,褐色 ,周围有翅 ,大小约 0 .5 mm× 0 .5 mm,千粒重 0 .0 5 5 g。在 2 0℃及 2 5℃的发芽温度下第 15 d的发芽率分别为 94%和 98% :在抑制紫花醉鱼草种子发芽的 30℃的温度下 ,180 0 lx～ 30 0 0 lx的人工光照和每日光照 16～ 2 0 h能促进种子萌发。在 2 5℃的发芽适温下 ,照光能使紫花醉鱼草种子萌发提前 1～ 3d。低温高海拔的生境和其种子萌发对高温与光照的需求 ,可能是紫花醉鱼草在自然环境中不能自然繁殖成为蔓延性杂草的原因之一。Buddleja fallowiana Balf.f.et W.W.Smith is an ornamental shrub mainly native to Lijiang and Zhongdian of NW Yunnan at altitudes of 2700~3800 meters.The seed is long elliptic, brown and surrounded with the wing .The seed-size is some 0.5mm×0.5mm,and the 1000-seed-weight is sbout 0.055g.The experiments showed tyat the germination rate if day 15 was 94% and 98% respectively with temperatures of 20℃and 25℃ under darkness.Under the inhibited temperature of 30℃, lighting intensities of 1 800lx^3 000lx and photoperiods of 16h^20h could stimulate the seed germination obviously. The seed germination could be ahead of 1~3 days if the light was provided under the optimun temperature of 25℃. The higher elevation and the lower temperature of the natural habitat togethering with the requirements of the seed germination, are possibly one of the main reasons to limits natural regeneration as a weedy species.

关 键 词：种子萌发 紫花醉鱼草 萌发条件 观赏植物 温度 光照 

分 类 号：S685.99[农业科学—观赏园艺] S687[农业科学—园艺学]