Chin J Plant Ecol ›› 2018, Vol. 42 ›› Issue (10): 1000-1008.DOI: 10.17521/cjpe.2018.0129

• Research Articles • Previous Articles     Next Articles

Construction of CO2-response model of electron transport rate in C4 crop and its application

YE Zi-Piao1,DUAN Shi-Hua2,AN Ting1,KANG Hua-Jing3,*()   

  1. 1 College of Math and Physics, Jinggangshan University, Ji’an, Jiangxi 343009, China
    2 School of Life Sciences, Jinggangshan University, Ji’an, Jiangxi 343009, China
    3 Wenzhou Academy of Agricultural Sciences, Wenzhou, Zhejiang 325006, China
  • Received:2018-05-29 Online:2018-10-20 Published:2019-01-30
  • Contact: Hua-Jing KANG
  • Supported by:
    Supported by the National Natural Science Foundation of China(31560069)

Abstract:

Aims Accurate estimation of variation tendency of photosynthetic electron flow response to CO2 is of great significance to understand the photosynthetic processes.
Methods A model of electron transport rate (J) response to CO2 (model II) was developed based on a new model of photosynthesis response to CO2 (model I). The data of maize (Zea mays) and grain amaranth (Amaranthus hypochondriacus) that were measured by LI-6400-40 portable photosynthetic apparatus were fitted by the two models, respectively.
Important findings The results indicated that the model II could well characterize and fit the CO2-response curves of electron transport rate (J-Ca curve) for maize and grain amaranth, and the maximum electron transport rates of maize and grain amaranth were 262.41 and 393.07 mmol·m -2·s -1, which were in very close agreement with the estimated values (p > 0.05), respectively. Based on these results, the allocation to other pathways of photosynthetic electronic flow were discussed. At 380 mmol·mol -1 CO2, the photosynthetic electron flows for carbon assimilation of maize and grain amaranth carbon were 247.92 and 285.16 mmol·m -2·s -1, respectively, when the CO2 for recovery of mitochondrial respiration was considered, and the photosynthetic electron flows for other pathways were 14.49 and 107.91 mmol·m -2·s -1, respectively. The photosynthetic electron flows for other pathways in grain amaranth were more six times than that in maize. The analysis shows that this difference is closely related to the types of catalytic decarboxylase and the locations of decarboxylation reactions. This finding provides a new perspective for investigating the differences between the two subtypes of nicotinamide adenine dinucleotide phosphate malic acid enzyme type and nicotinamide adenine dinucleotide malic acid enzyme type in C4 species. In addition, the CO2-response model of electron transport rate offers us an alternative mathematical tool for investigating the photosynthetic electron flow of C4 crop.

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Key words: C4 crop, electron transport rate, CO2 response, electron flow allocation, model development