
Photosynthetic physiological characteristics of two kinds of hornbeam under NO2 stress
SHENG Qianqian, DAI Anqi, SONG Min, TANG Rui, ZHU Zunling
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (2) : 10-16.
Photosynthetic physiological characteristics of two kinds of hornbeam under NO2 stress
【Objective】This paper is to evaluate the tolerance of Carpinus betulus and Carpinus putoensis to NO2 stress, and to provide a reference for the selection of landscape tree species resistant to air pollution.【Method】The annual seedlings of C. betulus and C. putoensis were fumigated with 12.0 mg/m3 NO2 for stress zero point(0 h, CK), 1, 6, 12, 24, 48, 72 h, respectively, the photosynthetic physiological indexes and chlorophyll fluorescence characteristics of C. betulus and C. putoensis seedlings were measured 30 days after fumigation. The relationship between different NO2 fumigation time and photosynthetic physiological response characteristics was analyzed, and the adaptability of C. betulus and C. putoensis seedlings to NO2 stress was compared.【Result】The results showed that after NO2 stress, C. betulus had higher Pn,max and Rd, lower light compensation point (LCP) and higher light saturation point (LSP), which indicated that C. betulus could grow normally under a wide range of light intensity. It is increased that the maximum photosynthetical efficiency (Fv/Fm) of C. betulus and C. putoensis leaf treated by NO2 for 1 hour. Only Fv/Fm value of C. betulus increased, PSⅡ activity and energy for photosynthetic electron transfer increased at 6 h of NO2 stress.【Conclusion】It is suggested that C. betulus could adapt to the adverse environment in an orderly manner under NO2 stress, with stronger tolerance. The results of this study are of great significance to the selection and allocation of urban road species.
NO2 stress / Carpinus betulus / Carpinus putoensis / photosynthetic characteristics index / chlorophyll fluorescence
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