Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

YUAN Jingqi, YU Zhongliang, LAN Xuehan, LI Chenghong, TIAN Nianjun, DU Fengguo

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5) : 58-66.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5) : 58-66. DOI: 10.12302/j.issn.1000-2006.202012003

Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

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Abstract

【Objective】To provide scientific basis for effective conservation measures for Thuja koraiensis, the photosynthetic characteristics of endangered plant T. koraiensis were analyzed and the relationship between photosynthesis and environmental factors was discussed. 【Method】The Li-6400 portable photosynthetic system was used in the study, the photosynthetic and physiological characteristics of the 7-year-old cutting seedlings of T. koraiensis in different light environments (L0, L1, L2 and L3, shade degrees were 0%, 25%, 50% and 75%, respectively.) including light response curve,diurnal variation of photosynthesis and pigment content were analyzed, and analysis of path coefficient was carried out. 【Result】The results of light response curve fitting showed that with the increaseing of shading intensity, the maximum net photosynthetic rate, dark respiration rate, light saturation point and light compensation point decreased significantly, which indicated that T. koraiensis had a certain shade-tolerance. The results of diurnal variation curve of photosynthesis showed that with the increasing of shading intensity, the net photosynthetic rate, stomatal conductance and transpiration rate decreased, and the principal reason of the reduction in photosynthesis was attributed to non-stomatal limitation factor. The results of pigment content showed that T. koraiensis responded to the shade environment by increasing the contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoids. The results of the analysis of path coefficient showed that, air relative humidity (RH) was the main environmental factor affecting the net photosynthetic rate of diurnal variation of photosynthesis under different light environments. According to the ranking of decision coefficient, RH had the largest effet on the net photosynthetic rate in L0 and L1, and PAR had the largest in L2 and L3. 【Conclusion】T. koraiensis had better photosynthetic performance under full light and 25% shading, and had a certain shade-tolerance. However, when the shading intensity was too high, the normal growth of plants would be affected by insufficient light.

Key words

Thuja koraiensis / shading treatments / photosynthesis / pigment content / analysis of path coefficient

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YUAN Jingqi , YU Zhongliang , LAN Xuehan , et al . Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2022, 46(5): 58-66 https://doi.org/10.12302/j.issn.1000-2006.202012003

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