Abstract:
Dalbergia odorifera T. Chen was used to study the effects of different concentrations of exogenous Ca
2+ on seedling growth and physiological characteristics under different artificial temperature conditions. Significant effects were found on stem height, leaf length,
Pn,
Gs,
Tr, and photosynthetic pigment content under different concentrations of Ca
2+ at normal temperature. However, limited effects were found on the relative water content and dew point water potential of leaves, relative conductivity, MDA, and soluble protein content. The optimum Ca
2+ concentration to improve plant growth was 5 mmol/L. In addition, stem height, leaf length,
Pn,
Gs,
Tr,
WUE, content of photosynthetic pigment, relative water content, dew point water potential, relative conductivity, MDA, and soluble protein content were significantly affected by cold stress. These negative effects could be alleviated by applying exogenous Ca
2+, with the optimal Ca
2+ concentration again found to be 5 mmol/L, followed by 10, 15, and 2.5 mmol/L under normal temperature and cold stress. The results of this study provide scientific guidance in regard to the adaptation of
D. odorifera to cold stress and its cultivation in low temperature regions of subtropical areas.