秦岭庙台槭(Acer miaotaiense Tsoong)种子休眠特性的研究

Study on Seed Dormancy Characteristics of Acer miaotaiense Tsoong in the Qinling Mountains

以秦岭珍稀树种庙台槭种子为实验材料,研究庙台槭种子种壳的透水性及不同部位浸提液对种子萌发的影响,探讨庙台槭种子的休眠特性。研究结果表明:去壳种子的吸水率与吸水速率显著提高(P<0.01),庙台槭的木质化种皮抑制了其对水分的吸收,是影响种子休眠的原因之一。庙台槭的果皮、种皮和种胚中均存在抑制种子萌发的物质,对小白菜籽萌发率、胚根长度、种苗高度的抑制作用差异极显著(P<0.01),抑制作用大小为种皮>果皮>种胚。

In order to discuss the dormancy characteristics of seeds about Acer miaotaiense Tsoong,an endangered species,the permeability of husk and the effects of inhibitors on seeds germination were tested.The results showed that water absorption rate and velocity both increased significantly(P<0.01)when the husk spun off seeds,which meant that seed coat was one of the factors affecting dormancy because the lignification restricted absorption of water from the environment.Some inhibitors existing in the pericarp,seed coat and embryo could inhibit the germination of cabbage seeds.There were obvious differences on the germination rate,radicle length and seedling height(P<0.01),and the inhibition degree was in the order of seed coat>pericarp>embryo.