Abstract
Maize growth is limited by various environmental factors. There is a variation in response of different maize cultivars released in different years to environmental changes. The objective of this study was to investigate the drought resistance of two maize cultivars released in different years, Jingke 968 and Zhengdan 958, under two environmental factors viz. CO2 concentration and irrigation. Two CO2 concentrations, 400 and 600 μmol·mol−1, and three irrigation treatments, high, medium, and low, were considered. By analyzing the photosynthetic parameters and stomatal morphological parameters, it was concluded that higher CO2 improved the value of the water use efficiencies (WUE). Moreover, Jingke 968 showed 55.45% higher value of WUE in comparison to Zhengdan 958. As compared to other treatments, drought significantly improved the WUE. Additionally, higher CO2 reduced the value of the stomatal area and stomatal shape index. At 600 μmol·mol−1 CO2 concentration, when the light intensity range was 1200–1800 μmol·m−2·s−1, Jingke 968 showed slightly higher value of the WUE in comparison to Zhengdan 958, but, the WUE of Zhengdan 958 was not limited by light intensity. Therefore, the results showed that under 600 μmol·mol−1 CO2 concentration and a light intensity of 1800 μmol·m−2·s−1, Jingke 968 was the preferred maize cultivar because of its high WUE.
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Numbers 51979288, 51879277, and 51909276).
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YH conducted the experiment, analyzed the data and wrote the first draft of the manuscript; YZ and SW designed the experiment, gave suggestions on data analysis and revised the manuscript; JW gave suggestions on data analysis and revised the manuscript.
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Han, Y., Wang, J., Zhang, Y. et al. Effects of Regulated Deficit Irrigation and Elevated CO2 Concentration on the Photosynthetic Parameters and Stomatal Morphology of Two Maize Cultivars. J Plant Growth Regul 42, 2884–2892 (2023). https://doi.org/10.1007/s00344-022-10754-7
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DOI: https://doi.org/10.1007/s00344-022-10754-7