Effects of Shading on Photosynthetic Characteristics and Non-structural Carbohydrate Content of Heptacodium miconioides Seedlings

doi:10.7525/j.issn.1673-5102.2022.06.020

Abstract

Abstract:

To investigate the growth and adaptation of Heptacodium miconioides under different light conditions， two-year-old H. miconioides seedlings were used as materials under three light intensities（full light， 60% shade and 90% shade）， and the photosynthetic characteristics and non-structural carbohydrate（NSC） content of H. miconioides were measured. The results showed that：（1）The diurnal changes of net photosynthetic rate（P_n） of H. miconioides seedlings under three light intensities showed “single-peak” curves. The daily mean values of P_n under three light intensities ranked as full light>60% shade>90% shade. The daily mean values of water use efficiency（W_UE） under 90% shade treatment was significantly lower than those under full light and 60% shade treatments；（2）Compared with full light， the light compensation point（L_CP） and dark respiration rate（R_d） of H. miconioides seedlings under 60% shade decreased significantly， while the light saturation point （L_SP）， maximum net photosynthetic rate（P_nmax）， maximum carboxylation rate（V_cmax）， maximum electron transport rate（J_max）， and triose phosphate utilization rate（T_PU） had no significant difference respectively. As shading degree increased， the L_SP， P_nmax， L_CP， R_d， V_cmax， J_max and T_PU of H. miconioides seedlings under 90% shade were significantly lower than those under full light and 60% shade treatments. （3）The contents of starch， soluble sugar and NSC in leaves of H. miconioides seedlings were highest under 60% shade treatment， and decreased significantly under 90% shade treatment. The NSC content of H. miconioides seedlings was significantly positively correlated with P_n， V_cmax， J_max and T_PU respectively. Therefore， H. miconioides had ability of photopholic and shade-tolerant at the seedling stage， and plants could adjust the photosynthetic characteristics of leaves by reducing L_CP and R_d， and maintained a high NSC content under moderate shading conditions， thereby to improve the utilization rate of weak light and carbon assimilation ability， however， excessive shading was not conducive to the growth of H. miconioides seedlings.

Key words: Heptacodium miconioides, shading, photosynthetic characteristics, non-structural carbohydrate

CLC Number:

Q949.781.2

Chunyan WEI, Yueling LI, Zexin JIN, Guangyu LUO, Chao CHEN, Fangquan SHAN. Effects of Shading on Photosynthetic Characteristics and Non-structural Carbohydrate Content of Heptacodium miconioides Seedlings[J]. Bulletin of Botanical Research, 2022, 42(6): 1096-1105.

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