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Dao Sik Son(孫斗植),Ka Aeng Ha(河佳鶯),Sang Jun Park(朴相俊),Jae Woo Hwang(黃在寓),Sang Rak Lee(李相錄) 한국육종학회 1992 한국육종학회지 Vol.24 No.3
The area of red pine forest stand damaged by pine gall midge insect has been wide spreading in the country. The damage causes a red pine tree to severe growth reduction and sometimes withering. To prevent the damage, it is needed to improve resistance of pinus densiflora to pine gall midge by introducing resistant factor. To see whether natural hybrid of P. densiflora and P. thunbergii founded in the area of coastal region in Kyungpook have fair resistance to the insect, the rate of growth reduction and gall forming on the needle were observed and the results were compared with those of parent species as follows. 1. The mean annual growth rates of ten year period before and after the year of 1983 were compared. That is, the comparison of mean annual growth rate of ten years period without and with pine gall midge damage, the growth reduction in P. densiflora was twice higher than P. thunbergii and their natural hybrid shows intermediate value of those parent species, i. e. the decrease of growth after attack to mean of annual growth of 10 years before attack in height and DBH was 70-80% and 40-70% in P. densiflora, 30-40% and 30-40% in P. thunbergii, 40-60% and 50-60% in hybrid, respectively. 2. Though P. densiflora has more needles containing pine gall midge eggs than P. thunberii by 15%, the rate of gall forming from them was 51.4% in P. densiflora and 21.5% in P. thunbergii. That is twice higher rate of gall forming in P. densiflora compare to P. thunbergii. 3. When the damage were classified into three grades, heavy, medium and light in mixed forest of two species, the value of above three grades were 32%, 67%, 1% in P. densiflora and 2%, 89%, 9% in P. thunbergii respectively.
Doo Sik Son(孫斗植),Jae Woo Hwang(黃在禹),Chang Ok Choi(崔章玉),Ka Aeng Ha(河佳鶯),Jae Durk Seo(徐在德) 한국육종학회 1994 한국육종학회지 Vol.26 No.2
In order to study the hybridity and origin of Populus glandulosa, the pollen tree of Populus alba×P. glondulosa, the variation of morphological characteristics and rooting abillity of Populus glandulosa were compared with those of P. tomentosa, P. davidiana and P. albs. The morphological characteristics, such as leaf length and width, petiole, leaf pubescence, gland of leaf base and stomata were investigated and global morphological comparison among these species was carried out by canonical discriminent analysis. Based on the morphological characteristics, P. tomentasa appeared to be intermediated of P. alba and P. davidiana, and P. glandulosa appeared to be the intermediate of and P. tomentosa and P. davidiana while P. dawidiana originated from Buchum and Suwon appeared to be the intermediate of P. glandulosa and P. davidiana. While P. davidiana had no rooting abillity as expected, P. tomentosa showed about 40% of rooting, which was about one half of the rooting ability of P. alba. P. glandulosa and Buchun & Suwon-originated P. davidiana showed 4~7% of poor rooting. This fact indicated rooting factor from P. alba was flowed into these species. P. tomentosa was reported already as a natural hybrid between P. alba var. Bolleana and P. davidiana in China. We can conclude from above results that P. glandulosa and P. davidiana originated from Buchun and Suwon is supposed to be an individual from hybrid between P. alba and P. davidiana.