Genotypic variation in photosynthetic limitation responses to K deficiency of Brassica napus is associated with potassium utilisation efficiency
Zhifeng Lu A B , Jianwei Lu A B , Yonghui Pan A B , Xiaokun Li A B , Rihuan Cong A B and Tao Ren A B C
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture, Wuhan 43 0070, China.
B Microelement Research of Centre, Huazhong Agricultural University, Wuhan 43 0070, China.
C Corresponding author. Email: rentao@mail.hzau.edu.cn
Functional Plant Biology 43(9) 880-891 https://doi.org/10.1071/FP16098
Submitted: 14 March 2016 Accepted: 18 May 2016 Published: 17 June 2016
Abstract
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 (SL), mesophyll conductance (MCL) and biochemical (BL) 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 SL for H9. Nevertheless, with increasing K supply, SL 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 SL, MCL and BL.
Additional keywords: K-based threshold, K utilisation efficiency, photosynthetic limitations, potassium deficiency.
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