Characteristics of Pinus thunbergii×P. massoniana F₁ Hybrid Seedlings

Pinus thunbergii×P. massoniana F₁ 교잡종(交雜種) 유묘(幼苗)의 특성(特性)

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.

Pinus thunbergii를 교배모수(交配母樹)로 하고 대만(台灣)으로부터 도입(導入)된 P. massoniana 화분(花粉)으로 인공교배(人工交配)한 교잡종(交雜種)과 그의 모수(母樹) 풍매차대(風媒次代)들에 대(對)한 충실종자생산(充實種子生産), 생장(生長), 외부형태학적(外部形態學的) 특성(特性) 및 Phenol 물질함량(物質含量)을 조사(調査)하였다. 1) 구과당(毬果當) 충실종자(充實種子) 생산량(生産量)은 교잡종(交雜種)이 평균(平均) 2.3립(粒)으로 풍매(風媒) 26립(粒)에 비(比)하여 저조(低調)하였다. 2) 유묘시(幼苗時) 묘고생장(苗高生長)은 교잡종(交雜種)이 풍매차대(風媒次代)에 비(比)해 평균(平均) 151%로 우수(優秀)하였으며 120~208%의 변이(變異)를 나타냈다. 3) 침엽(針葉)의 외부형태학적(外部形態學的) 특성(特性)은 교잡종(交雜種)이 풍매차대묘(風媒次代苗)에 비(比)하여 침엽(針葉)이 부드럽고, 연(軟)하고, 길며, 연록색(軟綠色)을 나타내고 해부형태(解剖形態)에 있어서는 수지구(樹脂溝)의 위치(位置)가 P. thunbergii 풍매차대(風媒次代)는 중위(中位)인데 비(比)하여 교잡종(交雜種)들은 중위(中位)와 외위(外位)가 동시(同時)에 나타났다. 4) Phenol 물질분석(物質分析)에 있어서는 교잡종(交雜種)과 P. thunbergii 풍매차대간(風媒次代間)에 뚜렷한 차이(差異)가 없었으나 Unknown 4와 6의 물질(物質)이 교잡종(交雜種)에만 나타난 사실(事實)은 특이(特異)하나 이것이 화분수(花粉樹)에서 유래(由來)된 것인지의 여부(與否)는 좀 더 구명(究明)되어야 할 과제(課題)이다.