用重量法测定63份玉米自交系种子的吸水速率，对不同杂种优势群种子平均吸水速率进行方差分析，并筛选各个类群中种子吸水速率较快的自交系。试验共筛选出吸水处理后48 h种子吸水速率大于0.6 mg/h的自交系36个，试验材料自交系分成P群、旅大红骨、瑞德、兰卡斯特和塘四平头5个杂种优势群，吸水后48 h种子平均吸水速率，兰卡斯特群0.73 mg/h，旅大红骨群0.71 mg/h，瑞德群0.62 mg/h，P群0.57mg/h，塘四平头群0.56 mg/h。结果表明，种子吸水速率在不同类群间不存在显著差异，在吸水时间之间存在显著差异。

Determination of water absorption rate of 63 maize inbred lines by gravimetric method, the average seed water absorption rate of the different heterosis groups were analyzed by variance analysis, and the inbred lines with high water-absorption rate of the seeds in each group were selected. A total of 36 inbred lines with seed water absorption rate greater than 0.6mg/h were selected in the experiment 48 hours after water absorption treatment. The inbred lines were divided into five heterosis groups:P group, Lvdahonggu(LRC), Reid, Lancaster and Tangsipingtou(TSPT). The average water absorption rate of the seeds 48 hours after water absorption was 0.73mg/h for Lancaster group, 0.71mg/h for Lvdahonggu group, 0.62mg/h for Reid group, 0.57mg/h for P group and 0.56mg/h for Tangsipingtou group. The results showed that the water absorption rate of the seed particles did not differ significantly between the different groups, but there were significant differences between the water absorption times.

国家重点研发计划项目（2016YFD0101204-3）、国家重点研发计划项目（2017YFD01101202）、河北农业大学河北省高等学校科学技术研究重点项目（ZD2017037）、大学生创新创业训练计划项目（20180409）、农林创新试验园建设及双创教育实践（2017cxcy034）