Effects of Regulated Deficit Irrigation and Elevated CO2 Concentration on the Photosynthetic Parameters and Stomatal Morphology of Two Maize Cultivars

文献类型： 外文期刊

第一作者： Han, Yuxin

作者： Han, Yuxin;Wang, Shuji;Han, Yuxin;Zhang, Yanqun;Han, Yuxin;Zhang, Yanqun;Wang, Jiandong

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关键词： CO2 concentration; Cultivars; Stomatal conductance; Stomatal density; Intrinsic water use efficiency

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.64； 五年影响因子：4.469 ）

ISSN： 0721-7595

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收录情况： SCI

摘要： 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 mu mol center dot 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 mu mol center dot mol(-1) CO2 concentration, when the light intensity range was 1200-1800 mu mol center dot m(-2)center dot 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 mu mol center dot mol(-1) CO2 concentration and a light intensity of 1800 mu mol center dot m(-2)center dot s(-1), Jingke 968 was the preferred maize cultivar because of its high WUE.

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