Crops ›› 2017, Vol. 33 ›› Issue (4): 96-104.doi: 10.16035/j.issn.1001-7283.2017.04.017

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Comparison of Photosynthesis-Light Response Curve Fitting Model of Hulless Barley

Hou Weihai,Wang Jianlin, ,Hu Dan   

  1. Institute of Plant Sciences/Plateau Crop Molecular Breeding Laboratory,Xizang Agiriculture and Animal Husbandry College,Linzhi 860000,Tibet,China
  • Received:2017-04-13 Revised:2017-06-27 Online:2017-08-15 Published:2018-08-26
  • Contact: Jianlin Wang

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Abstract:

Astract The mostly planted hulless barley species “Himalaya 22” in Tibet was used as the test material, and LI-6400XT photosynthetic apparatus was used to measure the photosynthetic light response curves of barley leaves in the 1st, 2nd and 3rd leaf at the flowering stage, and the rectangle hyperbola curve model (RH), modified rectangle hyperbolic curve model (MRH), exponential model (EM) and modified exponential model (MEM) were used to portray the light response curves of barley leaves at different positions. The fitting parameters of each model were compared and analyzed. The results showed that the maximum net photosynthetic rate (Pnmax) of barley leaves in the 1st, 2nd and 3rd leaf fitted by RH and NRH model was higher than the measured values, while the EM model fitting values were less than the measured value. The light saturation points (Is) of barley leaves in the 1st, 2nd and 3rd leaf fitted by RH and NRH were far less than the measured values, while the EM model fitting values were slightly less than the measured value; the Pnmax and Is of MRH were close to the measured values of the highland barley leaves at different position. Due to light suppression, the phase of the MRH model was negative, leading to that the Pnmax and Is could not be calculated. Under the condition of strong photosynthetically active radiation light (PAR>1 200μmol photon/m2·s), only the photosynthetic light response curve of barley leaves in the 1st, 2nd and 3rd leaf fitted by the model MRH was the closest to the measured photosynthetic curve with the best goodness of fit. The model fittng ranking was as follow: MRH model> MEM model> EM> RH, NRH model, therefore, the model MRH was the best fitting model of hulless barley.

Key words: Hulless barley, Light response model, Net photosynthetic rate, Light response curve

Table 1

Measured and fitted values of net photosynthetic rate-light response parameters of different position leaves on hulless barley in the five models"

光响应模型
Light response model		 器官Organ α AQE Pnmax
[μmol CO2/
(m2·s)]		 Is
[μmol CO2/(m2·s)]		 Ic
[μmol CO2/(m2·s)]		 Rd
[μmol CO2/(m2·s)]		 β λ γ ξ k
Pnmax实测值 倒1叶 - - ≈17.16 1 200~1 600 ≈17.40 - - - - - -
Pnmaxmeasured value 倒2叶 - - ≈14.30 1 200~1 600 ≈15.20 - - - - - -
倒3叶 - - ≈10.22 1 600~2 000 ≈12.00 - - - - - -
RH 倒1叶 0.101 0.05 20.59 428.12 8.43 0.818 - - - - -
倒2叶 0.100 0.05 17.17 414.93 16.42 1.499 - - - - -
倒3叶 0.062 0.03 11.87 419.37 12.18 0.710 - - - - -
NRH 倒1叶 0.067 0.05 18.70 395.12 16.04 1.053 - - - - 0.654
倒2叶 0.063 0.05 15.62 368.42 16.29 0.963 - - - - 0.678
倒3叶 0.056 0.03 11.65 392.20 11.87 0.635 - - - - 0.187
MRH 倒1叶 0.083 - 18.31 1 609.37 15.82 1.250 0.000091 - 0.003 - -
倒2叶 0.074 - 15.36 1 320.69 16.39 1.035 0.000127 - 0.003 - -
倒3叶 0.054 - 10.95 2 022.56 10.99 0.568 0.000049 - 0.004 - -
EM 倒1叶 0.063 - 16.35 1 209.00 14.10 - - - - - -
倒2叶 0.059 - 13.72 1 085.00 13.80 - - - - - -
倒3叶 0.037 - 9.79 1 223.09 4.46 - - - - - -
MEM 倒1叶 - 0.07 - - 15.46 1.008 -0.000027 15.705 16.713 0.004 -
倒2叶 - 0.06 13.73 1 229.40 12.66 0.740 0.000032 14.400 15.142 0.004 -
倒3叶 - 0.04 - - 8.98 5.000 -0.000058 8.915 9.246 0.004 -

Fig.1

Comparative analysis measured and fitted values of net photosynthetic rate-light response model in the top three leaves of the hulless barley"

Fig.2

Comparative analysis measured and fitted values of net photosynthetic rate-light response model in the top three leaves of the hulless barley under high light conditions"

Table 2

Goodness of fit from fitted values of net photosynthetic rate-light response parameters of different position leaves on hulless barley in the five models"

光响应模型
Light response model		 器官
Organ		 拟合优度Goodness of fit
AIC Ra2 RMSE MAPE R2
RH 倒1叶 -11.34 0.990 0.671 12.740 0.991
倒2叶 -9.14 0.983 0.722 10.582 0.985
倒3叶 -41.01 0.994 0.283 3.380 0.995
NRH 倒1叶 -18.55 0.992 0.551 6.650 0.994
倒2叶 -13.76 0.986 0.646 9.552 0.989
倒3叶 -41.47 0.995 0.291 3.013 0.996
MRH 倒1叶 -19.92 0.994 0.526 8.767 0.995
倒2叶 -22.62 0.992 0.481 8.034 0.994
倒3叶 -45.82 0.996 0.254 3.404 0.997
EM 倒1叶 -17.43 0.993 0.547 6.418 0.994
倒2叶 -14.33 0.988 0.588 9.468 0.990
倒3叶 -30.46 0.990 0.363 6.559 0.991
MEM 倒1叶 -18.03 0.992 0.560 6.537 0.994
倒2叶 -15.80 0.987 0.603 9.505 0.990
倒3叶 -33.06 0.990 0.379 6.558 0.992
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