Responses of photosynthetic physiology and sap flow to the introduction of external dye in Populus ×euramericana cv. ‘74/76’

doi:10.13287/j.1001-9332.202005.003

Abstract

Abstract: The exogenous liquid introduction technology is an effective way to produce the value-added poplar wood with excellent pattern color. This technology was used to add the various concentrated active red dyeing solution (0.2%, 0.4% and 0.6%) into target trees of six-year-old 107 poplar (Populus ×euramericana cv. ‘74/76’). The photosynthetic gas exchange parameter and sap flow rate were measured by Li-6400 photosynthetic instrument and TDP stem flowmeter, respectively. We analyzed the relationship between photosynthetic parameters, sap flow rate and dye absorption, and the effects of exogenous dye solution on the photosynthetic physiology and sap flow characteristics. The results showed that exogenous dyeing solution significantly inhibited flow rate of poplar trunks. The 0.2% concentrated liquid was far less effective than others (0.4% and 0.6%). The net photosynthetic rate (P_n), stomatal conductance (g_s) and transpiration rate (T_r) of poplars treated with different concentrated dyeing liquids were significantly lower than the control poplar. The intercellular carbon dioxide concentration (C_i) decreased first and then increased. The inhibitory effects of 0.4% and 0.2% concentrated dyeing solutions on photosynthesis were stronger than that of 0.6%. Dye absorption decreased with increasing dye concentration. The maximum liquid flow rate, P_n, g_s and T_r were significantly negatively correlated with the dye content. The contents of chlorophyll (a+b), chlorophyll a and chlorophyll b in exogenous dyeing solution treatments were significantly lower than those of the control at the later stage. The concentration of dyeing solution and introduction time determined the amount of dye absorption. The dye solution 0.4%, which was introduced for three days, could ensure the appropriate dye absorption and reduce the inhibitory effect on the physiological activities of the poplar.

Key words: Populus ×euramericana cv. ‘74/76’, photosynthetic physiology, dye solution introduction, sap flow rate

FAN Yu-lian, MA Chang-ming, MU Hong-xiang, LIU Bing-xiang, WANG Jin-mao, LIAN Ya-ni, WU Peng-fei, WANG Xiao. Responses of photosynthetic physiology and sap flow to the introduction of external dye in Populus ×euramericana cv. ‘74/76’[J]. Chinese Journal of Applied Ecology, 2020, 31(5): 1511-1517.

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