中文摘要：

作为一种重要的植物生长调节激素,GA_3在植物生长发育过程中起着重要作用。为探索破除沙米种子休眠的方法,研究了不同区域、不同年份沙米种子萌发对GA_3处理的响应。结果表明：1）不同区域沙米种子在GA_3作用下,沙坡头种子的发芽率、发芽势最高,高达100%,民勤种子的发芽率最低,最高仅为44%;在各处理中,GA_3最佳浓度梯度为1.5-2.0g·mL^-1,在此处理下的种子发芽率高达100%;2）不同年份的沙米种子在GA_3作用下其发芽率、发芽势表现为2006年〉2005年〉2004年〉1997年,表明种子寿命会随着时间的增加而下降;3）在不同浓度GA_3处理下,不同区域或不同年份间种子发芽率差异显著（p〈0.05）。表明GA_3可以破除沙米种子的休眠,对种子的萌发具有显著促进作用。

英文摘要：

As a velopment. In key plant growt order to explore paper studied the germination h regulator,GAa plays important roles in the process of plant growth and de- the way of breaking the seed dormancy of Agriophyllum squarrosum, this responses of the seeds collected from different regions and time to GA3 treat- ment. The results showed that, 1） among the seeds collected from different regions, those from Shapotou demonstrated the highest germination rate and potential after GA3 treatment,as high as 100%, while those from Minqin exhibited the lowest germination rate,only 44 %. The best concentration gradient of GA3 was 1.5~2 g · mL^-1 ,by which the germination rate reached almost 100%. 2） Among the seeds collected from different time,the germination rate and potential were in the order of 1997〈2004〈2005〈2006,indicating that the life expectancy of the seeds decreased with time. 3） Significant differences （p〈0.05） in germina- tion rate and potential were observed among the seeds from different regions or different time under differ- ent concentrations of GA3 treatment,indicating that GA3 could break the dormancy of A. squarrosum seeds and benefit its germination.