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Transgenerational effects of elevated CO2 on rice photosynthesis and grain yield

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The maternal carbon dioxide environment affected the responses of offspring to elevated carbon dioxide with regard to stomatal density, photosynthesis and yield.

AbstractSection Abstract

The responses of crops to rising carbon dioxide concentration ([CO2]) are often validated using single-generation short-term experiments. However, the transgenerational effects of elevated [CO2] on rice growth have received little attention. Here, we set up ambient [CO2] (a[CO2]) and elevated [CO2] (e[CO2], a[CO2] + 200 µmol mol−1) treatments using open-top chamber (OTC). Rice was cultivated in different [CO2] treatments over five growing seasons in 2016–2020. Beginning in 2017, rice seeds harvested in the previous year under a[CO2] and e[CO2] conditions were planted in their respective growing environments. In 2021, seedlings derived from a[CO2] maternal treatment (a[CO2]m) and e[CO2] maternal treatment (e[CO2]m) were planted with both a[CO2] offspring (a[CO2]o) and e[CO2] offspring (e[CO2]o) conditions to investigate the transgenerational effects of e[CO2]. Leaf gas exchange and grain yield under different conditions were determined in 2021. The results showed that light-saturated net photosynthesis (Asat) and stomatal conductance of offspring from e[CO2]m were significantly lower at the heading and grain-filling stages under e[CO2]o compared with a[CO2]m, and the corresponding stomatal density was also significantly lower. Moreover, Asat was positively correlated with stomatal density. These results suggest that transgenerational effects induce a decrease in stomatal density and thus cause a lower benefit of Asat from e[CO2]o. These findings contribute new insights into predicting crop growth and yield in the future.

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Data availability

The datasets are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 41530533, 31972937, 42071023) and the Youth Fund of the Ministry of Education Laboratory for Earth Surface Processes, Peking University. We sincerely thank Dr. Yao Huang at Institute of Botany, Chinese Academy of Sciences, China for his guidance and help in experiment and sampling.

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Authors and Affiliations

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Contributions

CL and YW conceived the ideas. ZH provided experimental platform. CL performed data collection, statistical analysis and wrote the first draft of the manuscript. JW drew the working model. CL, ZH and YW commented on the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yin Wang.

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The authors declare that they have no competing interests.

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Fig. S1

Effects of offspring [CO2] treatments on the actual quantum efficiency of PSII (ΦPSII) (a) and actual photochemical efficiency of PSII (Fv′/Fm′) (b) of rice derived from maternal a[CO2] and e[CO2] treatments at different growth stages (jointing, heading and grain-filling stages). Values are the mean ± SE (n = 9). a[CO2] and e[CO2] represent ambient and elevated CO2 concentrations, respectively. [CO2]o and [CO2]m indicate offspring and maternal CO2 growth environments, respectively. * represents significance at a probability level of p < 0.05. ns indicates no statistical significance. Fig. S2 Effects of offspring [CO2] treatments on intercellular [CO2] (Ci) of rice derived from maternal a[CO2] and e[CO2] treatments at different growth stages (jointing, heading and grain-filling stages). Values are the mean ± SE (n = 9). a[CO2] and e[CO2] represent ambient and elevated CO2 concentrations, respectively. [CO2]o and [CO2]m indicate offspring and maternal CO2 growth environments, respectively. Fig. S3 Correlation of stomatal conductance (gs) (a) and light-saturated net photosynthesis (Asat) (b) with stomatal length at heading stage. a[CO2]o and e[CO2]o represent offspring ambient and elevated CO2 concentrations, respectively. Fig. S4 Panicle number of plants from ambient maternal [CO2] (a[CO2]m) and elevated maternal [CO2] (e[CO2]m) conditions under ambient (a[CO2]o) and elevated offspring CO2 treatment (e[CO2]o). Fig. S5 Relative stomatal density of flag leaves of plants from ambient maternal [CO2] (a[CO2]m) and elevated maternal [CO2] (e[CO2]m) conditions under elevated offspring CO2 treatment in 2018–2021. *** represents significance at a probability level of p < 0.001. ns indicates no statistical significance. Fig. S6 Heat map of the differentially expressed genes in photosynthesis and related processes. a[CO2] and e[CO2] represent ambient and elevated CO2 concentration, respectively. [CO2]o and [CO2]m indicate offspring and maternal CO2 growth environment, respectively. Nine flag leaves were randomly selected for each treatment and frozen in liquid nitrogen and stored at -80 °C. Total RNA was extracted from a mixture of nine leaves using the TRIzol Reagent Mini Kit (Qiagen) following the manufacturer’s instructions. Sequencing was carried out using an Illumina HiSeq instrument according to manufacturer’s instructions (Illumina, San Diego, CA, USA). Gene-expression level was calculated and normalized to fragments per kilobase of transcript per million mapped reads. Fig. S7 Relative methylation modification levels of genes that change simultaneously at the transcription level and methylation level in plants from different maternal [CO2] environments (ambient maternal [CO2]: a[CO2]m; elevated maternal [CO2]: e[CO2]m) under different offspring [CO2] treatments (ambient offspring [CO2]: a[CO2]o; elevated offspring [CO2]: e[CO2]o). The genomic DNA was extracted from a mixture of nine leaves using the DNeasy Plant Mini Kit (Qiagen). Bisulfite conversion of DNA was carried out using the Epitect Bisulfite Kit (Qiagen) according to manufacturer’s instructions. Bisulfite-treated DNA was sequenced to determine the DNA methylation level. (DOCX 1741.7 kb)

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Lv, C., Hu, Z., Wei, J. et al. Transgenerational effects of elevated CO2 on rice photosynthesis and grain yield. Plant Mol Biol 110, 413–424 (2022). https://doi.org/10.1007/s11103-022-01294-5

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  • DOI: https://doi.org/10.1007/s11103-022-01294-5

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