水分胁迫对油松种子园自由授粉子代种子发芽能力的影响

Influence of Water Stress on Germination Capacity of Random Pollination Progeny Seeds from Pinus tabulaeformis Seed Orchard

将油松种子园自由授粉子代的34个家系的种子在不同浓度PEG溶液中进行萌发试验,结果表明,随着水分胁迫程度的加深,参试油松各家系种子的萌发均表现为发芽率,发芽势及发芽指数值的降低,平均发芽时间的延长。研究提出了种子发芽抑制相对指数概念,用以解释油松种子在水分胁迫萌发能力的强弱,具有很好的适用性。比较参试各家系种子在萌发过程中耐水分胁迫能力的强弱顺序,其中最强的家系是:7443、7400、7482、74110、74190,相对最弱的家系是74239、74186、74217、74120、74131。

The germination capacity of seeds of 34 families of random pollination progeny from Pinus tabulaeformis seed orchard are tested under different concentration PEG solution, the result shows： With water stress degree deepening, seed germination capacity of all tested families takes on a decrease in germination rate, germination viability and germination index value, a prolongation in average germination speed. The author put forward a concept of seed germination inhibition relative index, and it has good corking adapfivity to explain the seeds germination capacity of Pinus tabulaeformis under water stress. By comparison the capacity of resistance to water stress of seeds of all tested families in sprouting process, the best families are 7443,7400, 7482,74110,74190, and the relative worst ones are 74239,74186,74217,74120,74131.