This experiment was conducted to obtain basic research data concerned with the pollen physiology of native filberts in Korea. The results were as follows:
1. The best medium for pollen germination of Corylus heterophylla F. was agar 1%+sucrose 20%, followed by agar 1%+sucrose 30%, and agar 1%+sucrose 10% in the order. No germination was noted on medium of sucrose only.
2. Good pollen germination resulted in 20, 15 and 25℃ in. the decreasing order as related by the temperature during bloom period. At 30℃, pollen germination was extremely low.
3. In laboratory, C. heterophylla started blooming from January 20, and nearly in full bloom on February 20. The pollen germination exhibited a tendency similar to that in blooming.
4. The low temperature remarkably lowered the survival rate of pollen; pollen germination was extremely decreased in C. heterophylla and C. sieboldiana B. at -10℃∼12.5℃ for 1 hr. but C. sieboldiana completely lost the viability at -15℃∼-17.5℃ for 1 hr.
5. The interspecific and intervarietal pollination tests revealed results below;
1) Self-pollination resulted in low pollen germination rate of one percent in both native and introduced species except in HF-237 and HF-808 which showed exceptionally high germination rate.
2) High germination rate was largely noted between different lines and cultivars, but that of two combinations were below ten percent.
3) The interspecific combination of C. heterophylla×C. avellana L. produced relatively high pollen germination rate while comparatively low in other combinations of C. heterophylla×C. sieboldiana, C. sieboldiana×C. avellana, C. avellana×C. sieboldiana. However, a few crosses between lines and varieties marked comparatively high pollen germination even in interspecific combinations of low germination.
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