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中组8号（japonica）是一个具有深度休眠的优质早粳品系，休眠期为45天。该试验分别对其完整种子、剥壳种子及经干热预处理的完整种子进行试剂处理，并测试了其种子浸出液对水稻非休眠品种种子萌发的影响。研究表明，①55℃干热处理7天、0.1mol／LHNO3或0.1mol／LHC1浸种1天及其剥壳处理都能有效的打破其休眠，50ppMGA3效果不大，0.1mol／LKNO3及0．4％H2O2无效；②对于剥壳种子，0．1mol／LHNO3或0.1mol／LHC1有毒害作用，GA3有明显的促萌作用，KNO3或H2O2仍然无效；③干热处理后的完整种子对一些试剂的反应与未处理的相似，但该处理不能增强高酸度对完整种子的促萌作用；④H2O2具有依赖GA3的促萌作用，但这种作用机理尚不清楚；⑤抑萌物质存在于胚及胚乳中，种壳中不存在。通过分析认为中组8号的种子休眠主要由种壳透气性差引起，同时内源激素水平也对萌发产生一定程度的不利因素。
Japonica is a high-quality early Japonica line with deep dormancy with a dormant period of 45 days. In this experiment, the intact seeds, the peeled seeds and the whole seeds which were pretreated by dry heat were treated respectively, and the effects of seed leachate on the seed germination of non-dormant rice varieties were tested. The results showed that: ①55 ℃ dry heat treatment for 7 days, 0.1mol / LHNO3 or 0.1mol / LHC1 soaking for 1 day and its peel treatment can effectively break its dormancy, 50ppMGA3 little effect, 0.1mol / LKNO3 and 0.4% H2O2 Is not effective; ② For the peeled seeds, 0.1mol / LHNO3 or 0.1mol / LHC1 toxic effect, GA3 has a significant role in promoting the germination, KNO3 or H2O2 is still invalid; ③ dry heat treatment of the reaction of some seeds and reagents Treatment of similar, but the treatment can not enhance the high acidity on the role of promoting the full seed germination; ④ H2O2 has a role in promoting the germination of the GA3 dependent GA3, but this mechanism of action is not clear; ⑤ inhibitory substances exist in embryos and endosperm, Does not exist. The results showed that the seed dormancy of Zhongzhong No. 8 was mainly caused by the poor air permeability of the seedling and the endogenous hormone level also had some unfavorable factors on germination.