biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 67:54-66, 2023 | DOI: 10.32615/bp.2023.005

The photosynthetic eco-physiological adaptability of the endangered plant Tetracentron sinense to different habitats and altitudes

R. CHEN1, 2, W.L. MAO1, 2, W.Y. LI1, 2, H.Y. HAN1, 2, X.M. ZHANG1, 2, X.H. GAN1, 2, *
1 Key Laboratory of Southwest China Wildlife Resources Conservation, China West Normal University, Nanchong 637009, P.R. China
2 Institute of Plant Adaptation and Utilization in Southwest Mountain, China West Normal University, Nanchong 637009, P.R. China

Tetracentron sinense Oliv, the only tall deciduous tree in the family Tetracentraceae, is listed as a national second-grade key protected plant in China. To reveal the effect of associated species, irradiance, and altitudes on photosynthetic capacity of T. sinense, photosynthetic physiological characteristics of T. sinense and its associated species Acer pictum and Pterocarya stenoptera were measured by a Li-6400 portable photosynthetic meter. The light saturation point (LSP), the maximum net photosynthetic rate of the PN-PAR (PNmax), carboxylation efficiency (CE), the maximum net photosynthetic rate of the PN-CO2 (P*Nmax), carbon dioxide compensation point (CCP) and light respiration rate (Rp) of T. sinense in forest gap (FG) were higher than those in forest edge (FE) and understory (US). In FE, the net photosynthetic rate (PN), light compensation point (LCP), LSP, P*Nmax of T. sinense were lower than those of Pterocarya stenoptera, while the LSP, PNmax, and saturation point of carbon dioxide (Ciast) of T. sinense in US were lower than those of Acer pictum and Pterocarya stenoptera. The specific leaf area (SLA) of T. sinense decreased with reduction in the irradiance. With increasing altitude, the PNmax, LSP, and SLA of young individuals of T. sinense (YT) increased; the LCP of YT or the LSP of mature individuals of T. sinense (MT) increased first and then decreased. The results showed that 1) the photosynthetic capacity and adaptability of T. sinense were better in FG than that in FE and US; 2) the photosynthetic capacity of T. sinense in FE and US was weaker than that of its associated species, and its ecological range of light adaptation was also narrower than that of its associated species, placing T. sinense at a competitive disadvantage, which may be one of the important reasons for its poor regeneration; and 3) the environmental conditions at higher altitude can contribute to the growth and survival of T. sinense. Therefore, active artificial intervention should be undertaken to expand area of forest gap for T. sinense and transplant its seedlings to higher altitude to promote growth and population regeneration of T. sinense.

Keywords: Acer pictum, Acer sterculiaceum, altitude, irradiance, net photosynthetic rate, Pterocarya stenoptera, respiration rate, specific leaf area, Tetracentron sinense.

Received: June 14, 2022; Revised: March 1, 2023; Accepted: March 6, 2023; Published online: April 11, 2023  Show citation

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CHEN, R., MAO, W.L., LI, W.Y., HAN, H.Y., ZHANG, X.M., & GAN, X.H. (2023). The photosynthetic eco-physiological adaptability of the endangered plant Tetracentron sinense to different habitats and altitudes. Biologia plantarum, 67, Article 54-66. https://doi.org/10.32615/bp.2023.005
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