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

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 adaptivity 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.