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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (08): 1514-1519.doi: 10.3724/SP.J.1006.2013.01514

• RESEARCH NOTES • Previous Articles    

Photosynthetic Characteristics of Spike and Distribution of 14C-Assimilates Accumulated Before Anthesis in Wheat under Water Deficit Condition

ZHANG Lei,LÜ Jin-Yin*,JIA Shao-Lei   

  1. College of Life Sciences, Northwest A&F University, Yangling 712100, China
  • Received:2013-01-31 Revised:2013-04-22 Online:2013-08-12 Published:2013-05-20
  • Contact: 吕金印, E-mail: jinyinlu@163.com

Abstract:

Photosynthate in spike has an important contribution to grain yield in wheat. Two wheat cultivars, Xinong 928 (drought resistant) and Zhengyin 1 (drought sensitive), were labeled with 14CO2 seven days before anthesis to monitor the drought-responses in photosynthetic characteristics and dry matter translocation of spike during grain-filling period. Under water-deficit condition, the net photosynthetic rate of spike and contents of chlorophyll and sugar in glume at early- and mid-filling stage had slight declines in Xinong 928 but significant decreases in Zhengyin 1. At maturity stage, Xinong 928 showed no significant variations in water use efficiency and 14C-assimilate ratio in grain under water-deficit condition; whereas, Zhengyin 1 had a significant decrease (16.9%, P < 0.05) in water use efficiency and a significant increase (7.8%, P < 0.05) in 14C-assimilate ratio in grain. These results suggested that water deficit had limited influences on the photosynthesis of spike in the drought-resistant cultivar Xinong 928; however, moderate drought stress stimulated the translocation of dry matter from glume, palea, and lemma into grain in the drought-sensitive cultivar Zhengyin 1, which resulted in the increase of 14C-assimilate ratio in spike before anthesis.

Key words: Wheat, Water deficit, Photosynthetic characteristics of spike, Biomass translocation, 14C-labelling

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