Chin J Plan Ecolo ›› 2018, Vol. 42 ›› Issue (4): 498-507.doi: 10.17521/cjpe.2017.0320

• Research Articles • Previous Articles     Next Articles

Determination of maximum electron transport rate and its impact on allocation of electron flow

Zi-Piao YE1,Shi-Hua DUAN2,Ting AN1,Hua-Jing KANG3,*()   

  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
  • Online:2018-03-21 Published:2018-04-20
  • Contact: Hua-Jing KANG
  • Supported by:
    Supported by the National Natural Science Foundation of China (31560069).


Aims The non-rectangular hyperbolic model (termed as model I) is the main submodel of the FvCB biochemical model, which is used to estimate the maximum electron transport rate (Jmax) of plant leaves. The submodel is widely applied to fit the light-response curves of electron transport rate (J-I curves), and obtain Jmax. However, it has not been strictly verified whether Jmax calculated by model I is consistent with the measured values.

Methods Light-response curves of electron transport rate and of photosynthesis rate of soybean (Glycine max) (under shading and full sunlight) were simultaneously measured by LI-6400-40, then these data were simulated by model I and the mechanistic model of light-response of electron transport rate (termed as model II).

Important findings The results showed that there was the significant differences between Jmax estimated by model I and the observation data irrespective of shading and full sunny leaves of soybean. However, there was no significant difference between Jmax calculated by model II and the measured value. Because Jmax was overestimated by model I, it must lead to overestimate the amount of photosynthetic electron flow to allocate to photorespiration pathway, and magnify the photoprotection of photorespiration on plants. On the contrary, the Jmax and saturation light intensity (PARsat) obtained by the model II were in very close agreement with the observations. It can be concluded that the model II was superior to the model I in estimates of Jmax and PARsat. Therefore, we recommend model II to be used as an operational model for fitting J-I curves and accurately assess the role of photorespiration on plant photo-protection.

Key words: Glycine max, non-rectangular hyperbolic model, mechanistic model, FvCB biochemical model, electron transport rate

Fig. 1

Light response of electron transport rate for leaves of Glycine max under shading (A) and full sunlight (B) environments (mean ± SE, n = 5). Model I, non-rectangular hyperbola model; Model II, mechanistic model of light-response of electron transport rate."

Table 1

Observed data and results fitted by non-rectangular hyperbola model (model I) and the mechanistic model of light-response of electron transport rate (model II) for light-response curves of electron transport rate (J-I curves) of soybean under two light environments (mean ± SE, n = 5)"

参数 Parameter 处理 Treatment
遮阴 Shading 全日照 Full sunlight
Model I
Model II
Observed value
Model I
Model II
Observed value
Maximum electron transport rate (Jmax, mmol·m-2·s-1)
269.13 ± 5.22a 236.68 ± 1.39b ?236.29 354.26 ± 17.73a 307.91 ± 8.95b ?306.43
Saturated light intensity (PARsat, mmol·m-2·s-1)
1 839.98 ± 50.53 ?1 800 1 967.69 ± 110.64 ?2 000
确定系数 Determination coefficient (R2) 0.999 0.999 0.999 0.999

Fig. 2

Light-response curves of photosynthesis for shade (A) and sun (B) leaves of soybean (mean ± SE, n = 5). Model I, non-rectangular hyperbola model; Model II, mechanistic model of light-response of electron transport rate."

Table 2

Observed data and photosynthetic parameters fitted by non-rectangular hyperbola model (model I) and the mechanistic model of light-response of electron transport rate (model II) for light-response curves of photosynthesis (An-I curves) of soybean under two light environments, respectively (mean ± SE, n = 5)."

参数 Parameter 处理 Treatment
遮阴 Shading 全日照 Full sunlight
Model I
Model II
Observed value
Model I
Model II
Observed value
初始斜率 Initial slope of A-I curve, α (mmol·mol-1) 0.061 ± 0.044b 0.081 ± 0.032a - 0.064 ± 0.025a 0.069 ± 0.025a -
Maximum net photosynthetic rate, Anmax (mmol·m-2·s-1)
31.28 ± 1.33a 26.92 ± 1.23b ?27.23 45.56 ± 1.41a 35.52 ± 1.26b ?36.17
饱和光强 Saturated irradiance, Isat (mmol ·m-2·s-1) - 1 569.96 ± 24.89 ?1 600 - 1 998.36 ± 36.45 ?1 800
光补偿点 Light compensation point, Ic (mmol·m-2·s-1) 40.65 ± 2.85a 40.83 ± 2.74a ?41.59 51.49 ± 3.52a 51.62 ± 3.45a ?51.96
暗呼吸速率 Dark respiration, Rd (mmol·m-2 ·s-1) 2.42 ± 0.87b 2.99 ± 0.58a ?3.12 3.19 ± 0.56a 3.45 ± 0.42a ?3.51
确定系数 Determination coefficient, R2 0.999 0.999 0.999 0.999 0.999 0.999

Table 3

Photosynthetic electron flows of partitioning C assimilation and photorespiration pathway"

参数 Parameter 处理 Treatment
遮阴 Shading 全日照 Full sunlight
Model I
Model II
Observed value
Model I
Model II
Observed value
最大电子传递速率 Maximum electron transport rate, Jmax (mmol·m-2·s-1) 269.13a 236.68b 236.29b 354.26a 307.91b 306.43b
最大净光合速率 Maximum net photosynthetic rate, Anmax (mmol·m-2·s-1) 31.28a 26.92b 27.23b 45.56a 35.52b 36.17b
碳同化电子流 Electron flow of partitioning C assimilation, JC-max (mmol·m-2·s-1) 166.48a 155.67a 155.54a 219.23a 203.78a 203.26a
Electron flow of partitioning photorespiration assimilation, JO-max (mmol·m-2·s-1)
102.65a 81.01b 80.75b 135.03a 104.13b 103.17b
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