文献类型： 外文期刊

第一作者： Ye, Zi-Piao

作者： Ye, Zi-Piao;Liu, Yu-Guo;Kang, Hua-Jing;Duan, Hong-Lang;Chen, Xian-Mao;Zhou, Shuang-Xi

作者机构：

关键词： Electron flow; Light response; Photoprotection; Photorespiration; Photosynthesis; Saturation light intensity

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

ISSN： 0176-1617

年卷期： 2019 年 240 卷

页码：

收录情况： SCI

摘要： Suppression of photorespiration by low O-2 concentrations (Method 1) and simultaneous measurements of gas exchange and chlorophyll fluorescence (Method 2) are often used to estimate leaf photorespiration rate (R-p) of C-3 plants. However, it is largely unknown whether Method 1 and Method 2 can be used equivalently in estimating R-p. Using a field experiment on two wheat cultivars (T. aestivum JM22 and T. aestivum Z39-118) whose leaf gas exchange and chlorophyll fluorescence at low and normal O-2 concentrations (2% versus 21% O-2) were simultaneously measured across a wide range of light intensities (I), this study assessed the impacts of the two measures on R-p and its response under changing irradiance conditions. All the above quantities increased with the increasing I until reaching the cultivar-specific maximum values and the corresponding saturation light intensities. However, there were significant differences between R-p estimated by Method 1 and Method 2 at the I range from 150 to 2000 mu mol m(-2) S-1 for T. aestivum JM22 and from 150 to 1000 mu mol m(-2) S-1 for T. aestivum Z39-118. These findings demonstrated that the two methods cannot be used equivalently under changing irradiance conditions.

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