• Journal of Korean Society of Forest Science
• /
• v.69 no.1
• /
• pp.51-55
• /
• 1985

Pinus thunbergii ${\times}$ P. massoniana $F_1$ hybrids were made by pollinating 15 years old Japanese black pine (P. thunbergii) with Masson pine (P. massoniana) pollen, air-shipped from Taiwan. The crossability between two species were observed. Seedling height, morphological characteristics, and the composition of phenolic compounds of these hybrids and the open-pollinated progenies of P. thunbergii were investigated. The results of the observation were as follows; 1) Number of the hybrid seeds per cone was 2.3, while open-pollinated Japanese black pine produced 26 seeds per cone. 2) All hybrid seedlings outgrew P. thunbergii, averaging 151% of mean height of Japanese black pine seedlings. The growth of hybrids was much variable, ranging from 120% to 208% of mean height of the open-pollinated progenies of P. thunbergii. 3) With regard to needle characteristics, the hybrid needles were longer and softer than those of P. thunbergii. The color of hybrid needles showed yellowish green. The positions of resin ducts in P. thunbergii observed medial, while those of hybrids showed medial and external. 4) No large difference in phenolic compound composition between hybrid and P. thunbergii was found, but phenolic compound of unknown 4 and 6 were observed only in hybrid. Further intensive work is recommended in this area.