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Acta Agron Sin ›› 2017, Vol. 43 ›› Issue (01): 149-154.doi: 10.3724/SP.J.1006.2017.00149

• RESEARCH NOTES • Previous Articles    

Photosynthetic Characteristics and 14C-Assimilate Translocation in Wheat Spike during Mid- to Late-filling Stage under Water Deficit

MI Hui-Cong1,XIE Shuang-Ze2,LI Yue1,DING Han2,LYU Jin-Yin1,*   

  1. 1 College of Life Sciences, Northwest A&F University, Yangling 712100, China; 2 College of Science, Northwest A&F University, Yangling 712100, China
  • Received:2016-04-08 Revised:2016-09-18 Online:2017-01-12 Published:2016-09-20
  • Contact: 吕金印,E-mail: jinyinlu@163.com, Tel: 13572196187 E-mail:mihuicong@163.com
  • Supported by:

    This study was supported by the National Natural Science Foundation of China (31271624).


The objective of this study was to understand the effect of water deficit onphotosynthetic and assimilate translocation in wheat spike during mid- to late-filling stage by using two pot-cultured14C-labelled varieties differing in drought tolerance. Under moderate water deficit, the net photosynthetic rate (Pn) of flag leaf and spike at 20 days after anthesis (DAA) decreased by 50.2% and 19.9% in Zhengyin 1 (drought sensitive) and by 33.7% and 12.8% in Pubing 143 (drought tolerance), respectively. Obviously, the decrease of photosynthetic capacity greater in the drought-sensitive variety than in the drought-resistant variety in response to water stress. The 14C-assimilates accumulated rapidly in grains during 15–20 DAA and reached the peak at 25 DAA. Simultaneously, the 14C-assimilates in glume, lemma, and awn had a quick outward transportation during 15–20 DAA, and completely transferred to grains at 25 DAA. Compared with normal water condition, moderate water deficit resulted in significantly higher 14C-assimilates in grains at maturity. The 14C-assimilate accumulation in Pubing 143 was significantly higher than that in Zhengyin 1, and the yield loss caused by drought stress was 23.2% in Pubing 143 and 36.7% in Zhengyin 1. Compared with drought-sensitive variety, drought-tolerant variety received less influence of moderate water deficit on spike Pn and stronger assimilate translocation from spike bracts to grain. This might be the physiological basis of stable yield in drought-resistant wheat variety.

Key words: Wheat, Water deficit, Assimilates translocation, 14C-labelling

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