无芒隐子草不同节间部位的种子休眠对高温处理的响应

研究了无芒隐子草不同节间部位的种子休眠对高温处理的响应。结果表明,18 h高温(65,85和105℃)处理对不同部位种子的影响不同,105℃条件下全部死亡,85℃处理可显著破除各部位种子休眠并显著促进幼苗生长,65℃处理效果因部位而异,且85和65℃处理顶穗种子的发芽率和胚根、胚芽长均显著低于其他部位。不同节间部位的种子对不同时间85℃处理响应不同,3 h 处理即可显著破除各部位休眠,各时间处理间无显著差异。

Response to high temperature of Cleistogenes songorica seed dormancy from different positions

A series of laboratory tests were conducted with Cleistogenes songorica to study the effect of high temperature on seed dormancy release at different positions. The responses of seed dormancy release and seedling growth to 18 h high temperature (65, 85, 105℃) differed. All seeds were killed at 105℃ whereas 85℃ treatment broke seed dormancy and promoted seedling growth. The effect of 65℃ treatment varied with the position on the flower spike. Reponses of seed dormancy release at different positions to the 85℃ treatment differed with the treatment duration and a 3 h treatment significantly broke seed dormancy. Germination rate, plumule length, and radicle length of seeds on the top of spikes were significantly lower than those in the internodes.