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Plant function and evolutionary biology
RESEARCH ARTICLE

Improved leaf nitrogen reutilisation and Rubisco activation under short-term nitrogen-deficient conditions promotes photosynthesis in winter wheat (Triticum aestivum L.) at the seedling stage

Jingwen Gao A , Feng Wang A B , Hang Hu A , Suyu Jiang A , Abid Muhammad A , Yuhang Shao A , Chuanjiao Sun A , Zhongwei Tian A , Dong Jiang A and Tingbo Dai A C
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, P.R. China.

B Center of Excellence for Soil Biology, College of Resources and Environment, Southwest University, Beibei, Chongqing 400715, P.R. China.

C Corresponding author. Email: tingbod@njau.edu.cn

Functional Plant Biology 45(8) 840-853 https://doi.org/10.1071/FP17232
Submitted: 9 April 2017  Accepted: 6 February 2018   Published: 29 March 2018

Abstract

Excess N input results in low N use efficiency and environmental crisis, so nitrogenous fertiliser applications must be reduced. However, this can lead to low-N stress. Previous studies on low N have not explored the unique adjustment strategy to N deficiency in the short term, which is important for developing long-term N deficiency tolerance. In this case, two wheat (Triticum aestivum L.) cultivars with different tolerances to low N, Zaoyangmai (sensitive) and Yangmai158 (tolerant), were exposed to 0.25 mM N as a N-deficient condition with 5.0 mM N as a control. Under long-term N-deficient conditions, a significant decrease in Rubisco content resulted in decreased Rubisco activity and net photosynthetic rate (Pn) in both cultivars. However, the NO3 : soluble protein ratio decreased, and nitrate reductase and glutamine synthetase activity increased under short-term N deficiency, especially in Yangmai158. As a result, Rubisco content was not decreased in Yangmai158, while total N content decreased significantly. Moreover, increased Rubisco activase activity promoted Rubisco activation under short-term N deficiency. In sequence, Rubisco activity and Pn improved under short-term N deficiency. In conclusion, N deficiency-tolerant cultivars can efficiently assimilate N to Rubisco and enhance Rubisco activation to improve photosynthetic capabilities under short-term N deficiency conditions.

Additional keywords: glutamine synthetase; net photosynthetic rate; nitrate reductase; nitrogen deficiency; NO3 remobilisation.


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