Chin J Plan Ecolo ›› 2016, Vol. 40 ›› Issue (12): 1310-1318.doi: 10.17521/cjpe.2016.0082

• Research Articles • Previous Articles     Next Articles

Photosynthetic characteristics and photosynthesis-light response curve models of summer maize

Li LI1, Xiang-Xing ZHANG1, Rui ZHENG1,2,*, Jian-Qing GUO1,2   

  1. 1School of Environmental Science & Engineering, Chang’an University, Xi’an 710054, China;
    and
    2Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Xi’an 710054, China;
  • Online:2016-12-30 Published:2016-12-31
  • Contact: Rui ZHENG

Abstract:

Aim The photosynthesis-light response curve is the most commonly used method to explore the relationship between photosynthetically active radiation and the net photosynthetic rate, because it is more effective to reflect the plant photosynthetic characteristics. And it is very meaningful for researchers to choose a suitable summer corn (Zea mays) photosynthetic model and optimal the models of photosynthesis-light response curve by analyzing the differences between simulation and observation in each growth period of some plant. So the object of this paper was to propose some useful suggestions for the choice of summer corn photosynthetic modes and the optimization of the photosynthetic light response curves model in further.Methods In this paper, three typical photosynthetic models were used to fitting the photosynthetic light response curve for upper leaf, leaf at ear of grain and lower leaf of summer corn during bell and milk period. And then the fitting degree of each model was compared to the measured data. Photosynthetic active radiation was divided into three parts, and the fitting residual errors of these three models were analyzed individually.Important findings The photosynthetic characteristic parameters such as maximum net photosynthetic rate (Pnmax), saturated light intensity (Isat) and dark respiration rate (Rd) decreased constantly with a top-down leaf position and the parameters at milk stage were generally lower than the bell stage. Each growth period and leaf position could fit the curve, but some deviation exists for the Pnmax and Isat in the rectangular hyperbolic model and the non-rectangular hyperbolic model. The results of curve fitting residual showed that the simulation values from Ye Zi-Piao model were closest to the actual values, and especially for the high photosynthetically active radiation section.

Key words: photosynthetic characteristic parameters, Ye Zi-Piao model, saturated irradiance, residue

Table 1

Photosynthetic characteristic parameters of Zea mays at bell stage and milk stage respectively"

时期 Period 叶位 Leaf position 表观量子效率 AQE
(μmol CO2·μmol-1 photons)
最大净光合速率 Pnmax
(μmol·m-2·s-1)
饱和光强 Isat
(μmol·m-2·s-1)
光补偿点 Ic
(μmol·m-2·s-1)
暗呼吸速率 Rd
(μmol·m-2·s-1)
大喇叭口期
Bell stage
上部叶
Upper leaf
0.061a 36.78a 2 000a 48.87a 3.36a
穗位叶
Leaf at ear of grain
0.057b 36.99a 2 000a 49.14a 3.25a
下部叶
Lower leaf
0.051c 24.20b 1 800b 43.40b 2.63b
上部叶
Upper leaf
0.053a 19.70a 1 800a 32.29a 2.24a
乳熟期
Milk stage
穗位叶
Leaf at ear of grain
0.042b 18.66a 1 800a 32.32a 1.74b
下部叶
Lower leaf
0.040c 16.44b 1 800a 31.43a 1.50c

Table 2

Simulation results of light response parameters fitted by three models and the measured data at bell stage and milk stage respectively"

时期
Period
叶位
Leaf
position
模型
Model
初始量子效率
α (μmol CO2·
μmol-1 photons)
最大净光合速率
Pnmax
(μmol·m-2·s-1)
饱和光强
Isat
(μmol·m-2·s-1)
光补偿点
Ic
(μmol·m-2·s-1)
暗呼吸速率
Rd
(μmol·m-2·s-1)
决定系数
Determination coefficient
上部叶
Upper leaf
直角双曲线
Rectangular hyperbolic
0.083a 55.89Aa 997Aa 48.35Aa 3.70Aa 0.998
非直角双曲线
Non-rectangular hyperbolic
0.064b 48.70Ab 846Ab 49.33Aa 3.06Ab 0.998
叶子飘模型
Ye Zi-Piao model
0.068c 37.12Bc 2 235Bc 48.71Aa 3.15Ab 0.999
测量值
Measured data
- 36.78B 2 000B 48.87A 3.36B -
直角双曲线
Rectangular hyperbolic
0.079a 57.44Aa 1 071Aa 50.01Aa 3.65Aa 0.997
大喇叭口期
Bell stage
穗位叶
Leaf at
ear of
非直角双曲线
Non-rectangular hyperbolic
0.057b 47.35Ab 880Ab 50.75Aa 2.83Ab 0.998
grain 叶子飘模型
Ye Zi-Piao model
0.063c 37.10Bc 2 061Ac 50.23Aa 3.01Ac 0.999
测量值
Measured data
- 36.99B 2 000B 49.14A 3.25B -
直角双曲线
Rectangular hyperbolic
0.090a 33.93Aa 729Aa 41.46Aa 3.27Aa 0.996
下部叶
Lower leaf
非直角双曲线
Non-rectangular hyperbolic
0.059b 29.56Ab 628Ab 44.14Aa 2.50Ba 0.999
叶子飘模型
Ye Zi-Piao model
0.070c 24.18Bc 1 789Bc 42.98Aa 2.76Bb 0.999
测量值
Measured data
- 24.20B 1 800B 43.40A 2.63B -
直角双曲线
Rectangular hyperbolic
0.102a 25.30Aa 540Aa 31.31Aa 2.71Aa 0.997
上部叶 非直角双曲线
Non-rectangular hyperbolic
0.076b 23.90Bb 499Aa 32.29Aa 2.29Bb 0.999
Upper leaf 叶子飘模型
Ye Zi-Piao model
0.089c 22.71Bb 1 973Bb 31.63Aa 2.45Ba 0.998
测量值
Measured data
- 19.70B 1 800B 32.29Aa 2.24B -
直角双曲线
Rectangular hyperbolic
0.076a 24.94Aa 645Aa 32.09Aa 2.16Aa 0.996
乳熟期
Milk stage
穗位叶
Leaf at
ear of
非直角双曲线
Non-rectangular hyperbolic
0.050b 20.02Ab 561Ab 32.88Aa 1.59Bb 0.998
grain 叶子飘模型
Ye Zi-Piao model
0.062c 18.55Bc 1 819Bc 32.36Aa 1.83Bb 0.999
测量值
Measured data
- 18.66B 1 800B 32.32A 1.74B -
直角双曲线
Rectangular hyperbolic
0.073a 21.88Aa 595Aa 30.41Aa 1.92Aa 0.996
下部叶
Lower leaf
非直角双曲线
Non-rectangular hyperbolic
0.049b 19.67Ab 528Ab 30.81Aa 1.45Bb 0.998
叶子飘模型
Ye Zi-Piao model
0.059c 16.45Bc 1 777Bc 30.40Aa 1.61Bb 0.999
测量值
Measured data
- 16.44B 1 800B 31.43A 1.50B -

Fig. 1

Light response curves fitted by three models at bell stage and milk stage for summer maize. A, Light response curves fitted by rectangular hyperbolic model at bell stage. B, Light response curves fitted by non-rectangular hyperbolic model at bell stage. C, Light response curves fitted by Ye Zi-Piao model at bell stage. D, Light response curves fitted by rectangular hyperbolic model at milk stage. E, Light response curves fitted by non-rectangular hyperbolic model at milk stage. F, Light response curves fitted by Ye Zi-Piao model at milk stage."

Table 3

Residual sum of squares of light-response curves fitted by three models"

光合有效辐射 PAR
(μmol·m-2·s-1)
0-200 400-1 000 1 200-2 000
直角双曲线
Rectangular hyperbolic
0.75 1.15 1.92
非直角双曲线
Non-rectangular hyperbolic
0.40 0.31 0.50
叶子飘模型
Ye Zi-Piao model
0.28 0.14 0.05
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