摘要
目前内蒙古地区典型草原退化较为严重,要恢复原有的生态环境,提高草原生产力,可从建群种之一克氏针茅Stipa krylovii的人工辅助繁殖入手.自然状况下,克氏针茅的种子萌发率太低,为此采用多种无机化合物、不同温度以及植物生长调节剂赤霉素(GA3)对克氏针茅种子处理不同时间,研究不同处理对克氏针茅种子萌发的影响.结果表明适当的理化措施可提高克氏针茅种子发芽率与活力指数,其中效果最显著的处理为30%过氧化氢浸种20min,发芽率可达50%,发芽势为25%,分别比对照增长9倍,25倍;其次为300mg/L GA3浸种48h,发芽率为45.70%,发芽势为28.33%,分别比对照增长8倍,28倍.克氏针茅种子出芽率低的原因可能是由于种皮限制.该研究结果可为规模化繁殖克氏针茅,恢复草原生态环境,提高草原生产力提供重要的参考价值.
As the degradation of Inner Mongolian typical steppe area has been getting more serious in recent years,we should work at manually assisted breeding of the constructive species,Stipa krylovii to break seed dormancy and promote seed germination.Taking into consideration the fact that S.krylovii seed has low germination rate,in this study S.krylovii seed was made to germinate in different treatments of inorganic compounds,temperature and gibberellin（GA3）for different time duration so as to provide reference for large scale breeding of S.krylovii,restoration of grassland ecological environment and improvement of grassland productivity.The results showed that proper physicochemical measures improved germination rate and vigor index of S.krylovii seed,and presoaking with 30% H2O2 for 20min had the most significant effect on the seed germination of S.krylovii,the germination rate being 50% and germination vigor being 25%,a 9-and 25-fold increase compared with CK.Seed presoaking in 300 mg/L GA3 solution for48 hours gave a germination rate was 45.70%and a germination vigor of 28.33%,a 8-and 28-fold increase over CK,respectively.Seed coat limitation may be the main reason of low seed germination rate of S.krylovii.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第7期67-74,共8页
Journal of Southwest University(Natural Science Edition)
基金
国家重点基础研究发展计划(973项目)(2014CB138806)
中国111计划项目(104510-205001)
关键词
克氏针茅
种子
萌发
发芽率
种子活力
Stipa krylovii
seed
germination
germination rate
seed vigor
