| Citation: |
Zhu K，Fan YX，Zuo QH，Tan SY，Liu FW，Zhang J，Qin JM，Gao LN. Photosynthetic limitation in soybean in response to soil water-nitrogen interactions and its relationship with leaf water use efficiency[J]. Plant Science Journal，2024，42（5）：634−643. DOI: 10.11913/PSJ.2095-0837.24036
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Glycine max (L.) Merr. in northern China were selected as the experimental materials, with photosynthetic limitation as the primary focus of this study. A soil water-nitrogen interaction experiment was designed to explore the relationship between photosynthetic limitation and leaf instantaneous (WUEins) and intrinsic water use efficiency (WUEint). Results showed that: (1) CO2 diffusion limitations, including mesophyll limitation (lm) and stomatal limitation (lsc), gradually increased with water stress, while biochemical limitation (lb) gradually decreased. (2) The interaction between water and nitrogen reduced lm and lsc, while lb significantly increased. (3) lm and lb were negatively and positively correlated with WUEins and WUEint, respectively (P<0.05), while lsc showed no significant correlation with either. (4) Among the limiting factors, lm contributed most to soybean photosynthetic carbon assimilation and leaf water use efficiency, making it the dominant constraint on photosynthetic and water use capacity. These findings reveal the ecological effects of soil drought and atmospheric nitrogen deposition on crop photosynthetic carbon assimilation and their intrinsic relationship with water use capacity.
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