文章基本信息

标题：Effects of nitrogen stress on the photosynthetic CO2 assimilation, chlorophyll fluorescence and sugar-nitrogen ratio in corn
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作者：Xiuliang Jin ; Guijun Yang ; Changwei Tan 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep09311
语种：English
出版社：Springer Nature
摘要：A field experiment was conducted using three corn cultivars (Jingyu7, Nongda80, and Tangyu10) and three nitrogen (N) application rates (0, 75, and 150 kg N ha⁻¹). The objectives of this study were to investigate the responses of photosynthetic CO₂ assimilation (Ph), the maximum quantum yield of photosystem II (F_v/F_m), leaf dry weight (LDW), leaf nitrogen concentration (LNC), leaf sugar concentration (LSC), and the sugar-to-nitrogen concentration ratio (S/N) to N levels in three different field-grown corn cultivars on three sampling dates. The results showed that the LDW, F_v/F_m, Ph, LNC, and LSC increased with increasing N levels, and the variation patterns of F_v/F_m, Ph, and LNC were “low-high-low”. In contrast, S/N decreased with increasing N levels, and its variation pattern was “high-low-high”. The values of LDW, F_v/F_m, Ph, LNC, LSC, and S/N were greatest under high N conditions, followed by medium N conditions, and finally low N conditions. Significant interactions occurred between Ph, F_v/F_m, LNC, LSC, LDW, and S/N, with the exception of the interaction between LSC and S/N and between LSC and LDW. The correlation coefficients between Ph and S/N and between F_v/F_m and S/N were −0.714 and −0.798, respectively.