Photosynthesis, light energy partitioning, and photoprotection in the shade-demanding species Panax notoginseng under high and low level of growth irradiance
Jun-Wen Chen A B E , Shuang-Bian Kuang A , Guang-Qiang Long A C , Sheng-Chao Yang A , Zhen-Gui Meng A , Long-Gen Li A , Zhong-Jian Chen D and Guang-Hui Zhang A E
+ Author Affiliations
- Author Affiliations
A Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, Kunming, 650 201 Yunnan, People’s Republic of China.
B Department of Crop Science, College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, 650 201 Yunnan, People’s Republic of China.
C Department of Plant Nutrition, College of Resource and Environment, Yunnan Agricultural University, Kunming, 650 201 Yunnan, People’s Republic of China.
D Insitute of Sanqi, Wenshan University, Wenshan, 663 000 Yunnan, People’s Republic of China.
E Corresponding authors. Emails: cjw31412@hotmail.com; zgh73107310@163.com
Functional Plant Biology 43(6) 479-491 https://doi.org/10.1071/FP15283
Submitted: 11 September 2015 Accepted: 22 January 2016 Published: 1 March 2016
Abstract
Partitioning of light energy into several pathways and its relation to photosynthesis were examined in a shade-demanding species Panax notoginseng (Burkill) F.H.Chen ex C.Y.Wu & K.M.Feng grown along a light gradient. In fully light-induced leaves, the actual efficiency of PSII photochemistry (ΔF/Fmʹ), electron transport rate (ETR), non-photochemical quenching (NPQ) and photochemical quenching (qP) were lower in low-light-grown plants; this was also the case in fully dark-adapted leaves under a simulated sunfleck. In response to varied light intensity, high-light-grown plants showed greater quantum yields of light-dependent non-photochemical quenching (ΦNPQ) and PSII photochemistry (ΦPSII) and smaller quantum yields of fluorescence and constitutive thermal dissipation (Φf,d). Under the simulated sunfleck, high-light-grown plants showed greater ΦPSII and smaller Φf,d. There were positive relationships between net photosynthesis (Anet) and ΦNPQ+f,d and negative relationships between Anet and ΦPSII in fully light-induced leaves; negative correlations of Anet with ΦNPQ+f,d and positive correlations of Anet with ΦPSII were observed in fully dark-adapted leaves. In addition, more nitrogen was partitioned to light-harvesting components in low-light-grown plants, whereas leaf morphology and anatomy facilitate reducing light capture in high-light-grown plants. The pool of xanthophyll pigments and the de-epoxidation state was greater in high-light-grown plants. Antioxidant defence was elevated by increased growth irradiance. Overall, the evidences from P. notoginseng suggest that in high-light-grown shade-demanding plants irradiated by high light more electrons were consumed by non-net carboxylative processes that activate the component of NPQ, that low-light-grown plants correspondingly protect the photosynthetic apparatus against photodamage by reducing the efficiency of PSII photochemistry under high light illumination, and that during the photosynthetic induction, the ΔpH-dependent (qE) component of NPQ might dominate photoprotection, but the NPQ also depresses the enhancement of photosynthesis via competition for light energy.
Additional keywords: antioxidant defence, antioxidant, non-photochemical quenching, NPQ, photodamage.
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