Research on Seed Dormancy and Germination Characteristics of Pterocarya stenoptera Seeds
In order to determine the cause of seed dormancy and the method for breaking dormancy, the Pterocarya stenoptera seeds were used to study the seed permeability, the biological inhibition of seed extract, the effect of seed germination and the seed germination at different temperatures. The results showed that the water permeability of seed coat in Pterocarya stenophylla was good. There was germination inhibiting substances in the extract of Pterocarya stenoptera seeds, and the inhibitory substances may be the main cause of seed dormancy. Outdoor overwinter burying and outdoor stratification with snow had no obvious effect on dormancy breaking. Indoor cold stratification to remove seed dormancy was better. When cold stratification time reached 120 days, the germination rate was 89%. The temperature significantly affected the seed germination, and the germination ability under 25 ℃ was better than other temperature regimes. In conclusion, the Pterocarya stenoptera seed was not physical dormancy but physiological dormancy, and 120 days cold stratification was needed to break seed dormancy. The best germination temperature for dormancy released seeds was 25℃.
Pterocarya stenopteraseed dormancyseed germinationstratificationgermination temperature
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