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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (11): 2039-2045.doi: 10.3724/SP.J.1006.2011.02039

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Estimation of Use Efficiency of Electrons in Fixation of CO2 and Photorespiration for Maize (Zea mays) and Sorghum (Sorghum bicolor) under Photorespiratory Conditions

KANG Hua-Jing1,TAO Yue-Liang2,WANG Li-Xin1,YE Zi-Piao3,4,*,LI Hong1   

  1. 1 Department of Landscape Architecture, Wenzhou Vocational & Technical College, Wenzhou 325006, China; 2 College of Life & Environmental Science, Wenzhou University, Wenzhou 325035, China; 3 Research Center for Jinggangshan Eco-Environmental Sciences, Jinggangshan University, Ji’an 343009, China; 4 Maths & Physics College, Jinggangshan University, Ji’an 343009, China
  • Received:2011-01-21 Revised:2011-07-15 Online:2011-11-12 Published:2011-09-06
  • Contact: 叶子飘, E-mail: yezp@jgsu.edu.c

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Abstract: Gas exchange and chlorophyll fluorescence for maize (Zea mays L.) and sorghum (Sorhumbicolor L.) at 380 μmol CO2 mol-1 and 30℃under photorespiratory condition, using a gas analyzer Li-6400, were measured. The results showed that the light response curve and rapid light curve (RLC) were well simulated by a modified rectangular hyperbola model. Calculation based on the simulated results indicated the electron flows to fix CO2 for maize and sorghum were 198.60 and 178.00 μmol m-2 s-1, with the rate of 75.34% and 74.81%, respectively. The electron flows in photorespiration of maize and sorghum were 7.04 and 7.84 μmol m-2 s-1, with the rate of 2.67% and 3.29%, respectively. While by method of Valentini and Epron, the electron flows to fix CO2 of maize and sorghum were 217.92 and 188.54 μmol m-2 s-1, with the rate of 82.68% and 79.24%, respectively, and those in photorespiration of maize and sorghum were 45.67 and 49.40 μmol m-2 s-1, with the rate of 17.32% and 20.76%, respectively. The results obtained by the former method showed that some electrons via PSII were used to CO2 assimilation and photorespiration, whereas others associated with electron-consuming processes (e.g. O2 acceptor cycle or water-water cycle) which should not be ignored, and the electron-consumption in this process was not constant under photorespiratory conditions. While the electron flows via PSII in photorespiration of maize and sorghum were overestimated by the latter method. The value of electron flows in photorespiration calculated by the latter method was about six times higher than those by the former. This is very important to evaluate the effect of photorespiration for plant protection.

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