Shading Treatment-Induced Changes with Growth and Physiological Characteristics in Delphinium maackianum Regel

다국어 초록 (Multilingual Abstract)

Delphinium maackianum was grown under different shade treatments to examines the impact of different shading levels on the growth, physiological characteristics. The leaf mass per area (LMA) was lowest in the 95% shading treatment, indicating thinner and broader leaves, however significant differences were not observed across shading levels. Chlorophyll content (a, b, and total) increased with higher shading. Fv/Fm and NPQ values showed no significant differences among treatment groups except for the full light treatment, suggesting maintained photosystem II functionality and photoprotective mechanisms. The dark respiration rate (Rd) and light compensation point (LCP) decreased with increased shading, reflecting shade-tolerant plant responses. The 95% shading treatment exhibited the highest photosynthetic rates, light saturation points (LSP), and apparent quantum yields (AQY), indicating enhanced photosynthetic efficiency under low light conditions. Correlation analysis revealed negative relationships between relative light intensity and several physiological traits, including chlorophyll content, LCP, LSP, maximum photosynthetic rate, and AQY. This indicates that D.
maackianum optimizes photosynthesis under low light conditions by increasing light absorption and utilization efficiency.
The study underscores the species’ ability to adjust its physiological processes and structural characteristics to thrive in varying shading environments, highlighting its adaptive strategies for survival and growth in shaded habitats.