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낙엽성 참나무의 엽 및 모용 (毛茸) 형태의 수령에 따른 변이
이정호(Jeong He Lee),교힐준인(Hayato Hashizume),권기원(Ki Won Kwon) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.1
Morphological variations in leaves and leaf trichomes according to tree age were investigated for the identification of Quercus taxa at the different stages of development. The sizes of leaves from one-year-old seedlings of Q. serrata, Q. dentata, and Q. aliena were the smallest and increased with tree age. Blade length, blade width, petiole length, number of serration, and serration depth war also varied with tree age. Therefore, the examined taxa by the size and form of leaves were hardly identified at juvenile stages. The type, structure, and density of leaf trichomes of each species varied remarkably along with tree age. Three types of trichomes such as small stellate hairs, large stellate hairs, and long single hairs were observed on the abaxial side of leaves of Quercus taxa. In matured trees of Q. serrata both small stellate and long single hairs on leaves were observed. On the other hand large stellate hairs were found in leaves of Q. dentata. There were small stellate hairs in Q. aliens. In Q. mongolica var. crispula, no hair or small stellate hairs were occasionally found. It is possible to identify Q. serrata and Q. dentata by the characteristics of trichome even at two to three year old seedlings, while, it is difficult to tell Q. aliens and Q. mongolica var. crispula of seedlings from other taxa only by those of trichome.
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선발육종 넙치(Paralichthys olivaceus)의 성장형질에 대한 유전모수 및 유전적 개량효과 추정
박종원 ( Jong-won Park ),이다인 ( Da-in Lee ),정효선 ( Hyo Sun Jung ),김주란 ( Julan Kim ),양혜림 ( He-rim Yang ),이정호 ( Jeong-ho Lee ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.6
The aim of this study was to evaluate genetic parameters of growth traits for improving selective breeding in olive flounder Paralichthys olivaceus produced in April 2019. The total length and body weight at 11-, 18-, and 22-months-old were measured for 7,479, 2,831 and 1,904 individuals, respectively. Since 2004, we have been conducting a selective breeding program to improve growth traits in the olive flounder. Data were analyzed using the restricted maximum likelihood method using the multiple traits animal model. The effect of sex and production period showed significant differences in all traits (P<0.05). The heritability of all traits was 0.428-0.520, which is relatively high by measurement month. Therefore, it is considered that individual selection will be more advantageous than family selection. However, to maintain an appropriate degree of inbreeding and genetic diversity for future generations, it is necessary to consider family selection adequately. Results of the correlation analysis between the same traits accord ing to the measurement period indicated that considering production costs such as feed cost, selection at 18-months-old will be advantageous. Olive flounder is a major aquaculture species in Korea, and continuous selective breeding research is essential to improve productivity.
ScienceON
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