A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves
Abstract
:1. Introduction
2. Results
2.1. Differences in the Leaf Structure of Various Plant Species
2.2. Effect of Local Illumination on the Respiration Rate of Adjacent Region in the Same Leaves
2.3. Effect of Local Illumination on the Photosynthetic Rate of the Adjacent Region in the Same Leaves
2.4. Effects of the Changing Light Environment on the Respiration and Photosynthetic Rate of the Same Maize Leaves in the Field
3. Discussion
3.1. Lateral CO2 Diffusion Supports Photosynthesis in Maize Leaves
3.2. Mechanism of Lateral CO2 Diffusion inside the Maize Leaves
3.3. The Significance of Lateral CO2 Diffusion within the Leaf
4. Materials and Methods
4.1. Plant Materials and Experimental Design
4.2. Determination of Anatomical Structure and Leaf Porosity
4.3. Determination of Gas Exchange under a Controlled Light Environment
- (1)
- First, the measurement of the photosynthetic induction under the dark–light transition in the local regions was carried out. In this process, the light intensity in the local regions was maintained in darkness (0 μmol−2 m−2 s–1). After stabilization of the respiration rate in the local regions, the Light-Emitting Diode (LED) of the leaf chamber in the local regions was then turned on (light intensity: 1600 μmol m−2 s−1). During this process, the photosynthetic induction under the dark–light transition was recorded every 5 s (Figure 3A).
- (2)
- Secondly, the measurement of respiration in darkness and photosynthetic rate under steady light intensity in the adjacent region was carried out: The light intensity in the adjacent region was controlled to 0 or 1600 μmol m−2 s−1 via an LED of the leaf chamber, while the local regions were maintained in darkness. After a stable respiration rate or a steady-state photosynthetic rate in the adjacent region was achieved, the local regions were subjected to a light intensity of 1600 μmol m−2 s−1 controlled by an LED, and the changes in respiration rate or photosynthetic rate in the adjacent region under steady light intensity were recorded every 5 s (Figure 3B).
4.4. Determination of Gas Exchange in the Field
- (1)
- To investigate the effects of natural fluctuating light on photosynthesis in the local regions, the measurements in the local regions were carried out in the field with a gas exchange system (removal of LED light source) (Figure 3A).
- (2)
- To study the effects of natural fluctuating light on respiration or photosynthetic rate in the adjacent region, the measurements in the adjacent region were performed with a gas exchange system (with LED light source). The light intensity of the leaf chamber (adjacent region) was controlled to 0 or 1600 µmol m−2 s−1, and the respiration rate or photosynthetic rate in steady light intensity was determined, respectively (Figure 3B).
4.5. Statistical Analysis
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Wu, H.-Y.; Zou, Q.-Q.; Ji, W.-T.; Wang, Y.-W.; Zhang, W.-F.; Jiang, C.-D. A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves. Int. J. Mol. Sci. 2022, 23, 14530. https://doi.org/10.3390/ijms232314530
Wu H-Y, Zou Q-Q, Ji W-T, Wang Y-W, Zhang W-F, Jiang C-D. A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves. International Journal of Molecular Sciences. 2022; 23(23):14530. https://doi.org/10.3390/ijms232314530
Chicago/Turabian StyleWu, Han-Yu, Qing-Qing Zou, Wen-Tao Ji, Ying-Wei Wang, Wang-Feng Zhang, and Chuang-Dao Jiang. 2022. "A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves" International Journal of Molecular Sciences 23, no. 23: 14530. https://doi.org/10.3390/ijms232314530