温度和光照对羽扇豆种子发芽的影响

Effects of Temperature and Illumination on Seed Germination of Lupinus micranthus

对羽扇豆种子进行不同温度和光照处理的萌发试验,探究羽扇豆种子发芽最适萌发条件和在鄂西南山地的最适播种季节。结果表明,光照显著影响羽扇豆种子发芽势并与温度交互作用显著,10℃条件下全黑暗的发芽势显著高于交替光暗的发芽势,对其他指标影响不显著;交替光暗条件更有利于缩短管理羽扇豆的时间。温度对种子发芽率、发芽期指标和发芽势均有明显影响,5、10、15℃和5℃/10℃的低温条件最利于获得较高发芽率,变温优于恒温条件。鄂西南山地露天条件下,引种羽扇豆的最适播种季节为冬季,其次是春季、再次是秋季,避免高温的夏季播种。温度是羽扇豆种子萌发的关键环境因子。

In this study,the germination experiments of Lupinus micranthus seeds at different temperatures and different illumination were carried out to explore the optimum germination conditions and the optimum sowing season of lupine seeds in the southwest mountainous area of Hubei province.The results showed that illumination significantly affected the germination potential of L.micranthus seeds and had a significant interaction with temperature.The germination potential under full darkness at 10℃was significantly higher than that under alternating light and dark,but had no significant effects on other indexes.The total darkness condition was more advantageous to shorten the management time of L.micranthus.The germination rate,germination index and germination potential were obviously affected by temperature.The low temperature conditions of 5,10,15℃and 5℃/10℃alternation were the best for obtaining higher germination rate,and the variable temperature was better than the constant temperature condition.Under the condition of open air in the southwest mountainous area of Hubei province,the most suitable sowing season of L.micranthus was winter,followed by spring,then autumn,and avoiding summer sowing with high temperature.In conclusion,temperature was a key environmental factor for seed germination of L.micranthus.