红松种子休眠与种皮的关系

本文探讨红松(Pinus koraiensis)种子休眠与其种皮之间的关系。夹破中种皮后,种子萌发率很低。在离体胚培养基中外加 ABA 及经 ABA 溶液浸泡种子的萌发实验表明,ABA也不是导致休眠的关键因素。试验确认红松种子存在透气障碍,即中、内种皮对氧气的进入都有阻碍作用。经低温砂藏后,种皮的阻碍作用明显减小。种皮的透气性障碍可能是诱导休限的主导因素。

RELATIONSHIP BETWEEN SEED COAT OF KOREAN PINE AND ITS DORMANCY

The relationship between the seed coat and the seed dormancy of korean pine(Pinus ko- raiensis)is discussed in this paper.The germination percentage of seeds with their coats bro- ken,is very low.It showed that the mechanical obstruction of the hard seed coat is not the major cause of the seed dormancy.The experiments with embryos cultured in vitro and tre- ated with exogenous ABA or germination test of seeds soaked by ABA solutions show that ABA is not the major cause of the seed dormancy either.Respiratory patterns of the intact seeds and of those with their testa or both removing testa and inner coat were studied.It is indi- cated that removing both of testa and inner coat greatly enhanced the oxygen uptake.Ob- viously,the impermeability of oxygen through the seed coat is,therefore,the major external cause of the seed dormancy.