Effects of elevated atmospheric CO2 concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings

doi:10.12302/j.issn.1000-2006.202208059

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6): 124-132.doi: 10.12302/j.issn.1000-2006.202208059

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Effects of elevated atmospheric CO₂ concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings

WEI Yi¹(), WEI Xiaoli¹^,²^,^*(), WANG Mingbin¹, WANG Man¹, YU Dalong¹

1. Forestry College of Guizhou University, Guiyang 550025, China
2. Guizhou Forest Resources and Environment Research Center, Guiyang 550025, China

Received:2022-08-26 Revised:2022-10-24 Online:2023-11-30 Published:2023-11-23

Abstract

Abstract:

【Objective】This research aims to reveal a response strategy for the rare and endangered Ormosia hosiei facing of elevated atmospheric CO₂ concentration under future climate change, with the hope to forecast its future living conditions and take effective measures to prevent loss. 【Method】Two-year-old O. hosiei seedlings were planted in open-top chambers to simulate the effects of increasing atmospheric CO₂ concentration. Three CO₂ concentrations, namely 400 (CK), 600 (E1) and 800 μmol/mol (E2) were set. After 146 days of treatment, the effects of elevated CO₂ concentration on the photosynthetic physiology, apparent characteristics and leaf anatomical characteristics of the O. hosiei seedlings were analyzed. 【Result】(1) The photosynthetic physiological parameters of the O. hosiei seedlings maintained a high level in the elevated CO₂ environment. The chlorophyll and carotenoids in the E2 treatment increased by 8.65% and 23.47%, respectively, compared with CK. The activity of Ribulose-1,5-bisphosphate carboxylase/oxygenase and Ribulose-1,5-bisphosphatecarboxylase/oxygenase activase in the E2 treatment increased by 25.11% and 85.36%, respectively, compared with CK. The net photosynthetic rate in the E2 treatment increased by 235.40% compared with CK. The chlorophyll fluorescence parameters of maximum photochemical efficiency F_v/F_m in the E1 and E2 treatments significantly decreased by 29.46% and 9.12%, respectively, compared with CK, but the Y(Ⅱ) was not significantly different among the treatments. The chlorophyll fluorescence parameters reflected the photochemical quenching coefficient of photosynthetic activity in qP and qL under the E2 treatment. Under CK they significantly increased by 44.30% and 134.84%, respectively, reflecting that the heat dissipation capability of the photochemical quenching coefficients of qN and NPQ was not sensitive to the response to the elevated CO₂ concentrations. (2) In terms of leaf morphology and apparent characteristics, the leaf area of the O. hosiei seedlings increased but the leaves became thinner under high CO₂ conditions. The specific leaf weight of the O. hosiei seedlings decreased by 31.68% and 24.26% under E2 and E1 compared with CK, respectively. The increased CO₂ concentration significantly increased the palisade tissue thickness of the leaves but decreased the sponge tissue thickness. The excellent performance in photosynthetic physiology and leaf morphology of the O. hosiei seedlings under a high CO₂ environment increased the height and ground diameter by 6.90% and 13.35% in the E2 treatment compared with CK, respectively. 【Conclusion】 Elevated atmospheric CO₂ concentrations increased the photosynthetic substrates of O. hosiei seedlings’, improved the photosynthetic system of light energy capture, and increased photosynthetic activity. Light protection was not affected and the blade shape changed with the elevated CO₂ concentration to produce adaptability. Finally, the O. hosiei seedlings under the condition of elevated atmospheric CO₂ concentration showed synergistic photosynthetic physiological and morphological changes that promoted growth.

Key words: Ormosia hosiei, CO₂ concentration, photosynthetic physiology, leaf structure, apparent characteristics

CLC Number:

S718

WEI Yi, WEI Xiaoli, WANG Mingbin, WANG Man, YU Dalong. Effects of elevated atmospheric CO₂ concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(6): 124-132.

Figures/Tables 6

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处理 treatment	P_n/ (μmol·m^-2·s^-1)	T_r/ (mmol·m^-2·s^-1)	G_s/ (mol·m^-2·s^-1)	C_i/ (μmol·m^-2·s^-1)	E_WUE/ (mmol·mol^-1)
CK	3.39±0.42 c	0.78±0.11 b	0.043±0.002 b	253.03±25.59 c	4.45±1.27 c
E1	6.93±0.99 b	0.97±0.11 ab	0.060±0.010 a	381.85±28.89 b	7.20±0.98 b
E2	11.37±0.39 a	1.09±0.03 a	0.069±0.002 a	499.71±21.90 a	10.41±0.54 a

处理 treatment	叶面积/cm² LA	叶干质量/g LDW	比叶重/(g·cm^-2) leaf specific weight	株高净生长量/cm height net growth	地径净生长量/mm ground diameter net growth	高径比/(cm·mm^-1) ratio of height to ground diameter
CK	17.21±0.47 c	0.86±0.10 a	0.50±0.006 a	9.17±1.52 b	1.05±0.10 c	8.09±0.42 a
E1	22.17±1.02 b	0.84±0.07 a	0.38±0.004 b	9.50±1.04 b	1.83±0.97 b	7.34±0.25 b
E2	28.39±0.91 a	0.98±0.04 a	0.34±0.004 b	14.83±0.23 a	2.37±0.10 a	7.61±0.11 b

Effects of elevated atmospheric CO₂ concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings

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