草业学报2011，Vol.20Issue(6)：109-117,9.
细叶鸢尾种子休眠原因及解除休眠的方法研究
A study on the causes of Iris tenuifolin dormancy and the methods for breaking dormancy
摘要
Abstract
The causes of Iris tenuifolin seed dormancy were studied by the hygroscopicity of seeds, different scarification treatments and germination inhibitor tests. The embryo was not responsible for dormancy, while the seed coats and micropylar endosperm played important roles in reducing germination percentage. Additionally in the seed coats, there were polar germination inhibitors which were soluble in methanol. Sulphuric acid treatment for 60 min or cold-warm stratification (4℃/25℃) for 120 or 150 d effectively promoted germination percentage, from 0 to 51. 11 %, 36.67% and 40. 00%, respectively, and also increased the germination index to 0. 45, 0. 42 and 0. 51. The germination percentage was only 7. 78% if the seeds were stratified at 4'C for 150 d. The main reason why cold-warm stratification was better for germination, was that the mechanical resistance to embryo growth was considerably reduced and the growth potential of embryos was considerably enhanced. In summary, the seed of I. Tenuifolin has a physiological dormancy, which is caused by both the mechanical resistance of micropylar tissue and germination inhibitors in seed coats.关键词
细叶鸢尾/种子休眠/切割处理/萌发抑制物/机械阻力/生长势Key words
Iris tenuifolin / seed dormancy/ scarification treatment/ germination inhibitor/ mechanical resistance/ growth potential分类
农业科技引用本文复制引用
张丹,张金政,孙国峰,李晓东,何卿..细叶鸢尾种子休眠原因及解除休眠的方法研究[J].草业学报,2011,20(6):109-117,9.基金项目
中国科学院知识创新重要方向性项目(KSCX2-EW B-2,KSCX2-EW-B-5)资助. （KSCX2-EW B-2,KSCX2-EW-B-5）
