Photosynthetic characteristics changes and evaluation on shade tolerance of Pachysandra terminalis under different light conditions

YANG Xinrui, WANG Qing, LI Qian, YUE Ming, ZHAO Xueyan, BAI Jingru, LI Yan

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 162-170.

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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 (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 162-170. DOI: 10.12302/j.issn.1000-2006.202412015

Photosynthetic characteristics changes and evaluation on shade tolerance of Pachysandra terminalis under different light conditions

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Abstract

【Objective】This study aims to explore the effects of shading intensity on morphological characteristics, physiological indices, photosynthetic parameters, and chlorophyll fluorescence parameters of Pachysandra terminalis. It provides a theoretical basis for the application of P. terminalis in landscaping.【Method】Taking P. terminalis as the experimental material, four light conditions were set up: full light(control group, CK), 30% shading, 65% shading, and 85% shading. Measurements were taken on its morphological characteristics, physiological indices, photosynthetic parameters, and chlorophyll fluorescence parameters. The shade tolerance was comprehensively evaluated through principal component analysis and the membership function method.【Result】With the increase of shading intensity,the chlorophyll content, maximal quantum yield, PS Ⅱ activity, electron transport rate and photochemical quenching coefficient all showed an increasing trend. Leaf thickness, leaf area, crown width, specific leaf area, leaf water content, and relative conductivity showed an initial increase followed by a decrease. In all shading treatment groups, leaf length, leaf width, initial fluorescence, and non-photochemical quenching coefficient were significantly lower than those in the control group. Under the 65% shading condition, the apparent quantum yield reached its maximum value, the maximum net photosynthetic rate was significantly higher than that in other treatment groups, while the light compensation point reached its minimum value. Additionally, the light saturation point increased significantly compared to the control group.【Conclusion】P. terminalis is a shade-tolerant plant. Mild shading can promote its growth and development, with 65% shading being optimal.

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Pachysandra terminalis / shade tolerance / morphological characteristics / physiological characteristics / photosynthetic parameter / chlorophyll fluorescence paraments

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YANG Xinrui , WANG Qing , LI Qian , et al . Photosynthetic characteristics changes and evaluation on shade tolerance of Pachysandra terminalis under different light conditions[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2025, 49(6): 162-170 https://doi.org/10.12302/j.issn.1000-2006.202412015

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