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为确定新疆主栽春小麦品种新春31号的种子活力与穗位、成熟度的关系,分别在花后15d、20d、25d、30d、35d收获穗上部、中部和下部种子,测量种子长、宽、厚、千粒重等性状,并通过发芽实验分析发芽率、幼苗高度、干鲜重等种子活力指标。结果表明,花后35d收获的穗中部种子发芽率、发芽势均最高。在同一部位,随着收获期的延迟,种子长度、宽度、厚度、千粒重、幼苗干鲜重和种子活力指数呈明显的上升趋势,种子活力指数表现为中部穗位>下部穗位>上部穗位。经逐步回归分析,种子活力与千粒重和籽粒宽度的相关性最好,因此这两个指标可用作筛选高活力种子的主要指标。
In order to determine the relationship between seed vigor and ear position and maturity in spring wheat variety Xinchun No.31 in Xinjiang, the upper, middle and lower parts of the ear were harvested at 15d, 20d, 25d, 30d and 35d after anthesis to measure the seed length, width, Thick, 1000-grain weight and other traits, and through germination experiments analysis of germination rate, seedling height, fresh weight and other seed vigor indicators. The results showed that the germination rate and germination energy of the middle ear of spike harvested 35 days after anthesis were the highest. At the same location, the seed length, width, thickness, grain weight, dry weight of seedlings and seed vigor index increased obviously with the delay of harvest period. The seed vigor index showed the middle ear> lower ear> upper ear . Through stepwise regression analysis, the correlation between seed vigor and 1000-grain weight and grain width is the best, so these two indexes can be used as the main index for screening high-vigor seeds.