准噶尔山楂种壳、种皮、种胚特性与种子休眠的关系

以准噶尔山楂种子为试验材料，检测其种壳和种皮的透水性及超微结构、种胚休眠特性及种子浸提液的抑制作用。结果表明：（1）准噶尔山楂种子具有胚休眠特性，种壳存在一定的机械束缚和透水障碍，存在内源抑制物质是引起准噶尔山楂种子休眠的主要原因。（2）酸蚀处理能使种壳表面结构破损，角质层脱落，种壳变薄，栅栏组织结构和细胞排列未发生变化，种孔增大，种子表面出现裂缝，但并不影响种子生活力。（3）准噶尔山楂种子甲醇浸提液的生物测定结果说明，准噶尔山楂种子的种壳、种皮和种胚均含有内源抑制物质，不同部位浸提液对白菜种子的发芽率、根长和苗高的抑制作用不同。

Relationship between Characteristic of Crataegus songorica Husk,Seed Coat,Embryo and Seed Dormancy

The water permeability and ultrastructure of the husk and seed coat, embryo dormancy and inhibition activity of seed leach liquor of Crataegus songorica seed were determineed. The results showed that the embryo of C. songorica seed had dormanced, and the dormancy of the seed was mainly attributed to its husk and seed coat. The mechanical and permeability barrier of husk and seed coat had a negative effect on germination to a certain extent, but seed dormancy of C. songorica was mainly due to the inhibitory substances. Etching damaged the husk surface structure, made the cuticle shedding, husk thinning and micropyle increased. But palisade structure and cell arrangement did not change; the seed surface had cracked, but did not affect seed viability. The bioassay results indicated that the inhibitors were distributed in all the fractions of the seeds, and the inhibition activity was different.