한국약용작물학회지 Vol. 27 No. 1 (p.30-37)

차광처리가 눈개승마 유묘의 생장 및 생리적 특성에 미치는 영향

Effects of Shading Treatments on Growth and Physiological Characteristics of Aruncus dioicus var. kamtschaticus (Maxim.) H. Hara Seedling
키워드 :
Aruncus dioicus var. kamtschaticus,Chlorophyll Content,Chlorophyll Fluorescence,Performance Index,Photosynthetic Activity,Shading Treatment

목차

ABSTRACT
서 언
재료 및 방법
  1. 연구재료 및 차광처리
  2. 광합성 및 기공반응 측정
  3. 엽록소 함량 측정
  4. 엽록소 형광반응 측정
  5. 생장특성 조사
결과 및 고찰
  1. 광합성 및 기공반응
  2. 엽록소 함량
  3. 엽록소 형광 반응
  4. 생육특성
REFERENCES

초록

Background: This study was conducted to investigate the changes in the photosynthetic parameters, chlorophyll content, chlorophyll fluorescence, and growth characteristics of Aruncus dioicus var. kamtschaticus seedlings under different shading treatments. Methods and Results: The shading treatment was regulated with the shading level (non-shaded, 35%, 55%, and 75% shading). Photosynthetic activities, such as net photosynthetic rate, stomatal conductance, stomatal transpiration rate, and performance index on absorption basis (PIABS)were the highest under 35% shading (4.36 μ㏖ CO2·m−2·s−1, 54.2 m㏖ H2O·m2·s−1, 0.66 m㏖ H2O·m−2·s−1, and 1.3, respectively), and the lowest under 75% shading. This implies that the decrease in net photosynthetic rate may be due to an inability to regulate water and CO2 exchanged through the stomata. Thechlorophylla, b, and a + b contents were increased with elevating shading level and the chlorophyll a/b ratio showed non-significant differences. It was found that the dry weight (leaf, shoot, and whole) was the highest (1.14 g, 0.49 g, and 2.31 g, respectively) under 35% shading and the t/R ratio was the highest under 75% shading.
Conclusions: It is concluded that 75% shading exhibited a strong reduction of photosynthetic activity, and 35% shading showed the best conditions for the early growth and cultivation of A. dioicus var. kamtschaticus.