浸种处理对圆叶决明种子萌发的影响

摘要：为寻求圆叶决明(Chamaecrista rotundifolia)种子硬实破除技术，开展热水和硫酸浸种处理对2个圆叶决明品种种子萌发的影响试验。结果表明，未浸种条件下闽引圆叶决明、闽引2号圆叶决明种子硬实率分别达56.3%、76.0%。初始温度为100 ℃热水浸种3 min，闽引圆叶决明种子硬实率降至11.7%，发芽率升至42.7%，发芽指数达32.1，高于其他热水浸种处理。不同热水浸种处理闽引2号圆叶决明的种子硬实率无显著差异。98%硫酸浸种10 min，闽引圆叶决明、闽引2号圆叶决明的种子硬实率分别降至1.3%、0，而且发芽指数均达峰值，分别为58.9、37.0，相应的发芽率分别为64.7%、80.0%。

Effect of seed soaking with hot water and H_2SO_4 on seed germination of Chamaecrista rotundifolia

Seed hardness is a big problem for Chamaecrista rotundifolia cultivation.A experiment was conducted to determine the impact of seed soaking treatments(hot water and H2SO4) on germination of two varieties of C.rotundifolia(cv.Minyin and cv.Minyin NO.2) for finding a technique to break seed dormancy of C.rotundifolia seed.This study showed that seeds hardness rate of two varieties reached 56.3% and 76.0%,respectively;however,the hardness rate of Minyin treated by 100 ℃ water for 3 min decreased to 11.7%,and its germination rate and germination index increased to 42.7% and 32.1 respectively.The hot water treatments did not work on the seed hardness rate of Minyin NO.2.Seeds of Minyin and Minyin NO.2 treated by 98% H2SO4 for 10 min performed better,and indicating that their germination indexes were 58.9 and 37.0 and their germination rates were 64.7% and 80.0%,respectively.