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. 2022 Mar 31:13:817730.
doi: 10.3389/fpls.2022.817730. eCollection 2022.

Effects on Photosynthetic Response and Biomass Productivity of Acacia longifolia ssp. longifolia Under Elevated CO2 and Water-Limited Regimes

Muhammad Mansoor Javaid  1 , Xiukang Wang  2 , Singarayer K Florentine  3 , Muhammad Ashraf  4 , Athar Mahmood  5 , Feng-Min Li  6 , Sajid Fiaz  7
Affiliations

Effects on Photosynthetic Response and Biomass Productivity of Acacia longifolia ssp. longifolia Under Elevated CO2 and Water-Limited Regimes

Muhammad Mansoor Javaid et al. Front Plant Sci. .

Abstract

It is known that the impact of elevated CO2 (eCO2) will cause differential photosynthetic responses in plants, resulting in varying magnitudes of growth and productivity of competing species. Because of the aggressive invasive nature of Acacia longifolia ssp. longifolia, this study is designed to investigate the effect of eCO2 on gas exchange parameters, water use efficiency, photosystem II (PSII) activities, and growth of this species. Plants of A. longifolia ssp. longifolia were grown at 400 ppm (ambient) and 700 ppm (elevated) CO2 under 100 and 60% field capacity. Leaf gas exchange parameters, water use efficiency, intrinsic water use efficiency, instantaneous carboxylation efficiency, and PSII activity were measured for 10 days at 2-day intervals. eCO2 mitigated the adverse effects of drought conditions on the aforementioned parameters compared to that grown under ambient CO2 (aCO2) conditions. A. longifolia, grown under drought conditions and re-watered at day 8, indicated a partial recovery in most of the parameters measured, suggesting that the recovery of this species under eCO2 will be higher than that with aCO2 concentration. This gave an increase in water use efficiency, which is one of the reasons for the observed enhanced growth of A. longifolia under drought stress. Thus, eCO2 will allow to adopt this species in the new environment, even under severe climatic conditions, and foreshadow its likelihood of invasion into new areas.

Keywords: Acacia longifolia ssp. longifolia; drought; elevated CO2; photosynthetic processes; photosystem II; water use efficiency.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Effect of CO2 concentrations and moisture conditions on photosynthetic rate (A), stomatal conductance (B), transpiration rate (C), and intercellular CO2 concentration (D) of A. longifolia ssp. longifolia. Nail on the data point represents the SE of the mean, and vertical arrow line after day 8 represents the addition of water in the drought treatments. WW, well-watered.
FIGURE 2
FIGURE 2
Effect of CO2 concentrations and moisture conditions on water use efficiency (A), intrinsic water use efficiency (B), instantaneous carboxylation efficiency (C), and photosynthetic electron transport rate (D) of A. longifolia ssp. longifolia. Nail on the data point represents the SE of the mean, and vertical arrow line after day 8 represents the addition of water in the drought treatments. WW, well-watered.
FIGURE 3
FIGURE 3
Effect of CO2 concentrations and moisture conditions on minimum fluorescence (A), maximum fluorescence (B), quantum yield of photosystem II (PSII) (C), and photochemical efficiency of PSII (D) of A. longifolia ssp. longifolia. Nail on the data point represents the SE of the mean, and vertical arrow line after day 8 represents the addition of water in the drought treatments. WW, well-watered.
FIGURE 4
FIGURE 4
Effect of CO2 concentrations and moisture conditions on photochemical quenching (A) and non-photochemical quenching (B) of A. longifolia ssp. longifolia. Nail on the data point represents the SE of the mean, and vertical arrow line after day 8 represents the addition of water in the drought treatments. WW, well-watered.
FIGURE 5
FIGURE 5
Effect of CO2 concentrations and moisture conditions on plant height (A), stem diameter (B), number of leaves per plant (C), and number of branches per plant (D) of A. longifolia ssp. longifolia. Nail on the bar represents the SE of the mean.
FIGURE 6
FIGURE 6
Effect of CO2 concentrations and moisture conditions on leaf thickness (A), leaf area per plant (B), leaf fresh weight per plant (C), and leaf dry weight per plant (D) of A. longifolia ssp. longifolia. Nail on the bar represents the SE of the mean.
FIGURE 7
FIGURE 7
Effect of CO2 concentrations and moisture conditions on root fresh weight per plant (A), root dry weight per plant (B), shoot fresh weight per plant (C), and shoot dry weight per plant (D) of A. longifolia ssp. longifolia. Nail on the bar represents the SE of the mean.
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