
Effects of elevated atmospheric CO2 concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings
WEI Yi, WEI Xiaoli, WANG Mingbin, WANG Man, YU Dalong
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6) : 124-132.
Effects of elevated atmospheric CO2 concentration on the photosynthetic physiology and morphology of Ormosia hosiei seedlings
【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 Fv/Fm 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.
Ormosia hosiei / CO2 concentration / photosynthetic physiology / leaf structure / apparent characteristics
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