返青至拔节期高温对小麦农艺性状和产量的影响

Effect of High Temperature from Regreening Stage to Jointing Stage on Agronomic Characters and Yield of Wheat

为探索返青至拔节期高温对小麦农艺性状和产量的影响,以石麦25和石麦26为试验材料,采用田间搭棚增温的方法,设高温胁迫时间15、21和27 d计3个处理,以田间自然生长为对照,研究了返青至拔节期高温胁迫对小麦株高、秸秆韧性、穗部性状和产量的影响。结果表明:高温处理导致2个小麦品种的株高、重心高度、基部第2节间长度、不孕小穗数及其比例显著提高,基部第2节间机械强度、抗倒指数、单位面积穗数、穗粒数、千粒重和产量显著降低。随着高温持续时间的延长,高温对小麦农艺性状和产量的不利影响越大。

In order to explore the effect of high temperature from regreening stage to jointing stage on agronomic characters and yield of wheat,the plastic arch shed was built over wheat to increase temperature.The high temperature stress times including 15,21 and 27 days were set up taking the natural growth in field as the control.Shimai 25 and Shimai 26 were used as the research objects,the agronomic characters,yield components and yield were analyzed.The results showed that the plant height,center of gravity height,length of basal second internode and sterile spikelets increased significantly under high temperature,while the mechanical strength of basal second internode,lodging index,spike number per unit area,grain number per spike,thousand grain weight and yield decreased obviously.The longer was the high temperature,the greater was the adverse effect of high temperature on agronomic characters and yield of wheat.