期刊
FUNCTIONAL PLANT BIOLOGY
卷 43, 期 9, 页码 880-891出版社
CSIRO PUBLISHING
DOI: 10.1071/FP16098
关键词
K-based threshold; K utilisation efficiency; photosynthetic limitations; potassium deficiency
资金
- earmarked fund for China Agriculture Research System [CARS-13]
- Special Fund for Agroscientific Research in the Public Interest [201203013]
- PhD Candidate Research Innovation Project of Huazhong Agricultural University [2014bs17]
Cultivars with higher potassium utilisation efficiency (KUtE) are likely to have superior photosynthesis (A) under K deficiency. However, the inner link between KUtE and photosynthesis remains unclear. A quantitative analysis of stomatal (S-L), mesophyll conductance (MCL) and biochemical (B-L) limitations on A in response to K supplementation was performed on upper and lower leaves of Brassica napus L. Huayouza No. 9 (H9, high KUtE) and Zhongshuang No. 11 (Z11, low KUtE). Both cultivars showed remarkable improvement in leaf area and lower leaf photosynthesis with elevated K supply. The total photosynthetic limitation of Z11 in lower leaf was 51.9% higher than that of H9 under K deficiency. Most of limitation under K deficiency was dominated by MCL for Z11, yet it was equally controlled by MCL and S-L for H9. Nevertheless, with increasing K supply, S-L became the primary limitation for both cultivars. Z11 needed a 12.0% higher leaf K concentration to avoid A decline, and higher K-based thresholds for each limitation. Overall, cultivars higher in KUtE have improved inherent leaf photosynthesis and area, and present lower K-based thresholds for S-L, MCL and B-L.
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