超干处理对柳枝稷种子活力及幼苗生长特性的影响  

Effect of Ultra-dry Treatment on Seed Vigor and Seedling Growth of Switchgrass

作　　者：何学青[1] 沙亚.海拉提 龙明秀[1] 梁玉生 陶奇波 呼天明[1] 

机构地区：[1]西北农林科技大学动物科技学院,陕西杨凌712100

出　　处：《草地学报》2017年第5期1055-1060,共6页Acta Agrestia Sinica

基　　金：国家自然科学基金(31502005);中央高校基本科研业务费(Z109021422)资助

摘　　要：研究超干处理对柳枝稷(Panicum virgatum L.)种子活力及幼苗生长特性的影响,为柳枝稷种子耐干性及贮藏提供理论基础。采用硅胶干燥法将柳枝稷种子含水量由9%分别降至7%,5%,3%,2%,1%,测定不同含水量条件下种子的活力以及种子萌发后第14 d幼苗的叶面积、根长、苗长、根冠比、鲜重、干重及相对电导率等指标的影响。柳枝稷种子含水量由对照9%降到2%的过程中,种子仍保持较高活力。含水量降至1%种子活力显著下降,但种子的相对电导率与种子活力没有显著相关性。超干处理后幼苗生长正常。柳枝稷种子属于正常型种子,其贮藏的安全水分下限为2%。超干处理并没有破坏柳枝稷种子细胞膜的完整性,也未对幼苗的生长造成损伤。In order to provide a theoretical basis for desiccation tolerance and the storage of switchgrass（Panicum virgatum L.） seeds,we investigated the effect of ultra-dry treatment on the vigor of switchgrass seeds and seedling growth. The moisture content of switchgrass seeds was reduced to 7 %,5 %,4 %,3 %,2 % and 1 % from 9 %（control）,respectively,with silica gel,and the vigor were detected when the seeds were re-moistened. And the leaf area,root length,seedling length,root/shoot ratio,fresh weight,dry weight and relative electrical conductivity were detected after the seed had germinated in 14 days. In the process of reducing the moisture content of switchgrass seeds from 9 % to 2 %,the seed vigor was kept relative high. When the moisture was reduced to 1 %,seed vigor decreased significantly. However,there was no significant difference between seed vigor and relative electrical conductivity. The seedling growth of the ultra-dry seeds was normal. Switchgrass seed was an orthodox seed and its low-limit of safe moisture content was 2 %. Ultra-dry treatment didn＇t damage the integrity of the cell membrane and the seedling growth.

关 键 词：柳枝稷 超干处理 种子活力 耐干性 幼苗生长 

分 类 号：Q945.78[生物学—植物学] S330.2[农业科学—作物遗传育种]