垂穗披碱草种子成熟过程中活力变化及适宜收获期研究

目的]研究垂穗披碱草种子成熟过程中活力的变化,确定垂穗披碱草种子适宜的收获期。方法]以垂穗披碱草成熟种子为材料,测定其标准发芽率、加速老化后发芽率、发芽指数、活力指数、种苗芽长、电导率、脱氢酶活性以及酸性磷酸酯酶活性;结合种子含水量和产量变化,确定垂穗披碱草种子适宜收获期。结果]垂穗披碱草种子活力随着成熟度的增加而提高,在盛花期后16d,活力水平已达较高水平。盛花期后第25～31天（8月20～26日）,种子含水量下降到42.00%～36.59%,此时活力处于很高水平,种子产量接近最高值,达到1746.3kg/hm2,此时为适宜的种子收获期。结论]该研究结果可为我国牧草种子生产提供科学的理论依据。

Study on the Changes of Seed Vigor during the Maturation Process of Elymus nutans and Its Optimal Harvesting Time

Objective]The research aimed to study the changes of seed vigor during the maturation process of Elymus nutans,and to determine its optimal harvesting time.Method]Taken mature seeds of E.nutans as materials,and standard germination percentage,accelerated aging germination rate,germination index,vigor index,seedling length,electric conductivity,dehydrogenase activity and acid phosphoesterase activity of mature seeds of E.nutans were investigated.Then combined with the changes of seed water content and yiel...