摘要
在恒温、变温和光照3种处理因素6个梯度水平的条件下,对取自4个不同海拔高度垂穗披碱草(Elymus nutans)种子的适宜发芽条件进行了研究。结果表明,垂穗披碱草的适宜发芽温度范围为15～25℃;变温可显著提高种子发芽率和发芽整齐度,最佳变温组合为20℃/10℃,发芽率和发芽势分别较20℃恒温条件提高20.2%;垂穗披碱草种子萌发对光照条件反应不敏感;在低温条件下,低海拔种子的总体发芽能力要优于高海拔种子,而在高温条件下则表现为高海拔优于低海拔的态势,但在中等温度条件下,各海拔高度的种子间无显著差异。
This study was aimed at determing suitable germination conditions for Elymus nutans seeds col- lected from four altitudes （3 941, 3 528, 3 212 and2 925 m）. These seeds were germinated under different temperatures and light gradients. The results indicated that the suitable germination temperatures of E. nutans ranged from 15 ℃ to 25℃. Variable temperature can significantly improve germination uniformity and germination rate. The best combination of variable temperature was 20℃/10℃, in which germination rate and germination potential increased 20.2% compared with that at 20 %. Germination of E. nutans seeds were not sensitive to light conditions. In the lower temperature, seed germination ability from the lower altitude was superior to that from the higher altitude, while in the higher temperature, seed ger-mination ability from the higher altitude was superior to that from the lower altitude. In the intermediate temperature, however, the seed germination performance did not show significant differences among four altitude levels.
出处
《草业科学》
CAS
CSCD
北大核心
2012年第5期759-767,共9页
Pratacultural Science
基金
国家科技支撑计划项目(2009BAC53B04)
甘肃省重大专项(2009GS02706)
关键词
垂穗披碱草
种子
温度
发芽条件
Eiymus nutans
seeds
temperature
germination conditions
