播期对优质小麦籽粒灌浆特性及产量构成的影响

通过田间试验和室内分析,研究了播期对不同基因型优质冬小麦的影响。结果表明:(1)强筋品种藁城8901的灌浆高峰出现在最晚播期,而弱筋品种SN1391出现在最早播期。藁城8901籽粒干物质积累达到高峰后籽粒干重又有所下降,而SN1391从开花后7天始,直到花后35天籽粒干重一直处于上升趋势。(2)两个品种所有播期处理的籽粒灌浆速度变化均呈单峰曲线。(3)不同播期不同品种籽粒的平均灌浆速率存在极显著差异,强筋品种藁城8901以晚播处理最高,弱筋品种SN1391以早播处理最高。(4)随着播期的推迟每平方米穗数、穗粒数和千粒重均呈先上升后降低的趋势,两个品种的最高产量均出现在第二播期。

Effect of sowing time on grain filling characteristics and grain yield components of high quality wheat cultivars

The effects of sowing time on grain filling characters and yield formation of different kinds of wheat cultivars have been investigated.The results indicated that:firstly,the sowing time had strong effect on the dry matter accumulation of wheat grain.The dry matter accumulation peak of strong gluten flour variety 8901 occurred at the last sowing time while the weak gluten variety SN1391 at the first sowing time.The dry matter accumulation of strong gluten flour variety 8901 reached its peak at 28 days after flowering,and then decreased on a linear trend.However,the dry matter accumulation of SN1391 kept increasing during the whole grain filling period.Secondly,the changes of grain filling rate on different sowing time were similar and one-peak curve appeared.Thirdly,the average filling rate of different sowing time showed significant difference.For strong gluten flour variety 8901,the maximum filling rate appeared at the last sowing time while that of weak gluten variety SN1391 appeared at the first sowing time.Fourthly,the spike number,kernel numbers per spike,and the weight of 1000 kernels increased firstly and then decreased with the sowing time postponed,and the maximum yields of the two varieties occurred at the second sowing time.