中文摘要：

【目的】在大田试验条件下,设置不同去苞叶处理,研究去苞叶后夏玉米产量、籽粒体积、干重、脱水速率、籽粒灌浆速率以及籽粒黑层出现和乳线消失所需时间的变化,以期明确去苞叶对夏玉米籽粒产量和籽粒灌浆特性的作用。【方法】以先玉335（XY335）、郑单958（ZD958）和登海661（DH661）为试验材料,设置不同去苞叶处理：去苞叶1/4（S1）、去苞叶1/2（S2）和苞叶全去（S3）以及对照（CK）,研究去苞叶对夏玉米产量、籽粒灌浆特性以及籽粒黑层出现和乳线消失所需时间的影响等。【结果】去苞叶后夏玉米产量显著下降,XY335的S1、S2和S3处理的产量较CK分别下降9.45%、13.78%和27.89%,ZD958分别下降10.72%、15.07%和24.75%,DH661分别下降9.31%、16.01%和22.35%,去苞叶数越多,产量下降幅度越大。去苞叶后夏玉米的千粒重和穗粒数等产量构成因素显著下降,S3处理影响最显著,XY335的S3处理千粒重和穗粒数分别下降15.30%和14.87%,ZD958分别下降11.22%和15.24%,DH661分别下降15.10%和8.55%。此外,去苞叶显著影响夏玉米的籽粒灌浆特性,影响随去苞叶数的增多而显著加剧。去苞叶后籽粒到达最大灌浆速率时的天数（Dmax）显著减少,S3处理影响最显著,XY335、ZD958和DH661的S3处理的Dmax较CK分别缩短3 d、4 d和3.5 d。去苞叶后灌浆速率最大时的生长量（Wmax）和籽粒灌浆活跃期（P）等也均显著降低,且去苞叶数目越多,Wmax和P的下降幅度越大,XY335﹑DH661和ZD958的S3处理的Wmax较CK分别下降12.75%、17.78%和17.12%。XY335﹑DH661和ZD958的S1﹑S2、S3的P较CK分别下降6.22%、9.82%和11.78%,5.39%、8.39%和13.09%,0.17%、2.39%和5.97%。去苞叶后籽粒鲜重和籽粒体积显著下降,籽粒脱水速率显著提高,灌浆时间减少,籽粒乳线消失时间和籽粒黑层出现时间较正常发育的籽粒缩短,S3处理影响最显著,XY335﹑ZD958和DH661的S3处理的籽粒乳线消失所需?

英文摘要：

【Objective】 A field experiment was conducted to study the effects of dislodging subtending leaf on grain yield,grain volume,dry weight,dehydrating rate and grain filling rate of summer maize.【Method】Three maize cultivars XY335,ZD958 and DH661 were used to analyze the effects of subtending leaf on grain yield and yield components,grain filling（grain volume,dry matter and dehydrating rate）,and the time of milk lines disappearance and black layer appearance of summer maize by setting different dislodging subtending leaf treatments such as dislodging 1/4 subtending leaf（S1）,dislodging 1/2 subtending leaf（S2）,dislodging all subtending leaves（S3）,and CK.【Result】 The results showed that grain yield of summer maize decreased significantly after dislodging subtending leaf.Grain yields of S1,S2 and S3 of XY335 decreased by 9.45%,13.78% and 27.89% respectively,compared to CK.Yields of ZD958 decreased by 10.72%,15.07% and 24.75%,respectively,compared to CK.Yields of DH661 decreased by 9.31%,16.01% and 22.35%,respectively.The damage increased with increasing number of dislodging subtending leaf.Grain weight and grain number per panicle of summer maize decreased significantly after subtending leaves were dislodged.The greatest effect was observed under the S3 treatment.Grain weight and grain number per panicle of S3 decreased by 15.30% and 14.87% in XY335 compared to CK,that of ZD958 decreased by 11.22% and 15.24% compared to CK,and that of DH661 decreased by 15.10% and 8.55% compared to CK.In addition,dislodging subtending leaf significantly affected grain filling characteristics.The damage increased with increasing number of dislodging subtending leaf.Days of reaching maximum grain filling rate（Dmax） decreased significantly,and was the most susceptible to damage from dislodging all subtending leaves（S3）.That of XY335,ZD958 and DH661 decreased by 3 d,4 d,and 3.5 d compared to CK.Weight of reaching maximum grain filling rate（Wmax） and active grain filling period（P） decreased signific