多效唑对蓝茎冰草种子质量形成的影响  

Effects of paclobutrazol( PP_(333)) on seed quality for western wheatgrass

作　　者：李世忠 王迪[2] 徐坤[3] 

机构地区：[1]宁夏农业勘查设计院,宁夏银川750002 [2]长安大学环境科学与工程学院,陕西西安710054 [3]宁夏大学西北退化生态系统与重建教育部重点实验室,宁夏银川750021

出　　处：《草业科学》2015年第10期1619-1624,共6页Pratacultural Science

摘　　要：针对蓝茎冰草（Agropyron smithii）种子生产中因倒伏、收获期等原因造成种子质量偏低的问题,在甘肃省酒泉地区,以种植3年的蓝茎冰草为试验材料,通过喷施多效唑处理,研究种子质量的变化。结果表明,三叶期喷施多效唑（PP333）降低了蓝茎冰草种子发育后期含水量的下降速度,种子含水量从45%下降到35%对应的天数由对照的3 d提升到6-9 d,这使得种子成熟趋于一致,有效地减少了落粒损失。当PP333喷施量为2.40 kg·hm^-2时,蓝茎冰草在盛花期后第42天适宜收获,此时种子干重和标准发芽率均具有最大值。Low seed quality of western wheatgrass in China was caused by lodging and harvesting dates. The trials were conducted with 3-year western wheatgrass to study the change of seed quality after PP333 spraying in Jiuquan area of Gansu Province. The results showed thatspraying PP333 in three-leaf stage reduced western wheatgrass seed moisture decreasing rate during late seed development period. Seed moisture decreasing from 45% to 35% needs 3d in CK but 6 - 9 d after spraying PP333,which made the seed maturation tend to be consistent and reduced grain losses effectively. When the PP333 spraying rate was 2. 40 kg·ha^- 1,the most suitable harvest date western wheatgrass was the 42 nd day after full-bloom stage because the seed dry-weight and standard germination percentage was the maximum value at that time.

关 键 词：蓝茎冰草 种子质量 多效唑(PP333) 

分 类 号：S543.9[农业科学—作物学]