4种中国野生无髯鸢尾种子休眠原因的研究

玉蝉花、山鸢尾、金脉鸢尾和西南鸢尾4种中国野生无髯鸢尾种子均存在休眠。对种子进行了离体胚培养、切割胚乳、剥离种皮等处理和用Instron 5848微力材料试验机测量刺穿珠孔端结构所需要力的试验，研究表明：种皮对种子萌发具有一定的影响，珠孔端胚乳对胚生长的机械束缚是萌发的主要限制因素；4种无髯鸢尾的种子的胚乳中含有抑制种子萌发的物质，它们对种子的成苗率有显著影响。

Dormancy Causes of the Seeds of Four Species of Wild Apogons iris in China

The seeds of Iris ensata, Iris setosa, Iris chrysographes and Iris bulleyana, the four species of Apogon iris are all dormant. The failure in germination of the seeds were studied by embryos in vitro culture, endosperm scarification treatments, seed coat removal and measuring the force need to pierce the structure in the micropylar end with Instron 5848 MicroTester. The results indicated that embryo was not responsible for dormancy and seed coat had something to do with it, while the mechanical resistance acted on embryo which came from endosperm at the micropylar end was the most important limiting factor to germination. We presumed that the endosperm of the four species of iris seeds may contain the germination inhibitors, which affected the stocking percentage significantly.