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

doi:10.17521/cjpe.2018.0129

Abstract

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-C_a 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 CO₂for 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.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201810003

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

YE Zi-Piao, DUAN Shi-Hua, AN Ting, KANG Hua-Jing. Construction of CO₂-response model of electron transport rate in C₄ crop and its application[J]. Chin J Plant Ecol, 2018, 42(10): 1000-1008.

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References 33

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光合参数 Photosynthetic parameter	玉米 Maize		千穗谷 Grain amaranth
光合参数 Photosynthetic parameter	拟合值 Fitted value	估算值 Estimated value	拟合值 Fitted value	估算值 Estimated value
α_c	0.247 ± 0.033^b	—	0.334 ± 0.022^a	—
A_c-max(mmol·m^-2·s^-1)	59.12 ± 0.67^b	? 60.39	69.97 ± 0.71^a	? 70.49
C_a-sat(mmol·mol^-1)	1 335.74 ± 196.52^a	? 1 400	976.25 ± 12.06^b	? 1 000
Γ (mmol·mol^-1)	4.35 ± 2.08^b	? 4.25^b	12.77 ± 0.53^a	? 13.41
R_l(mmol·m^-2·s^-1)	1.13 ± 0.64^b	? 0.24	2.44 ± 0.15^a	? 0.28
R²	0.997	—	0.991	—

光合参数 Photosynthetic parameter	玉米 Maize		千穗谷 Grain amaranth
光合参数 Photosynthetic parameter	拟合值 Fitted value	估算值 Estimated value	拟合值 Fitted value	估算值 Estimated value
α_c	0.247 ± 0.033^b	—	0.334 ± 0.022^a	—
A_c-max(mmol·m^-2·s^-1)	59.12 ± 0.67^b	? 60.39	69.97 ± 0.71^a	? 70.49
C_a-sat(mmol·mol^-1)	1 335.74 ± 196.52^a	? 1 400	976.25 ± 12.06^b	? 1 000
Γ (mmol·mol^-1)	4.35 ± 2.08^b	? 4.25^b	12.77 ± 0.53^a	? 13.41
R_l(mmol·m^-2·s^-1)	1.13 ± 0.64^b	? 0.24	2.44 ± 0.15^a	? 0.28
R²	0.997	—	0.991	—

光合参数 Photosynthetic parameter	玉米 Maize		千穗谷 Grain amaranth
光合参数 Photosynthetic parameter	拟合值 Fitted value	估算值 Estimated value	拟合值 Fitted value	估算值 Estimated value
α_ce(mol·m^-2·s^-1)	1.215 ± 0.543^a	—	1.208 ± 0.357^a	—
J_max(mmol·m^-2·s^-1)	262.41 ± 1.64^b	? 265.66	393.07 ± 37.84^a	? 397.82
C_a-sat(mmol·mol^-1)	1 198.58 ± 342.78^a	? 1 200	1 229.10 ± 59.14^a	? 1 200
J₀(mmol·m^-2·s^-1)	22.22 ± 8.35^a	? 27.69	27.43 ± 4.97^a	? 29.26
R²	0.978	—	0.992	—

光合参数 Photosynthetic parameter	玉米 Maize		千穗谷 Grain amaranth
光合参数 Photosynthetic parameter	拟合值 Fitted value	估算值 Estimated value	拟合值 Fitted value	估算值 Estimated value
α_ce(mol·m^-2·s^-1)	1.215 ± 0.543^a	—	1.208 ± 0.357^a	—
J_max(mmol·m^-2·s^-1)	262.41 ± 1.64^b	? 265.66	393.07 ± 37.84^a	? 397.82
C_a-sat(mmol·mol^-1)	1 198.58 ± 342.78^a	? 1 200	1 229.10 ± 59.14^a	? 1 200
J₀(mmol·m^-2·s^-1)	22.22 ± 8.35^a	? 27.69	27.43 ± 4.97^a	? 29.26
R²	0.978	—	0.992	—

光合作用参数 Photosynthetic parameter (mmol·m^-2·s^-1)	[CO₂] = 380 mmol·mol^-1		[CO₂] = 0 mmol·mol^-1
光合作用参数 Photosynthetic parameter (mmol·m^-2·s^-1)	玉米 Maize	千穗谷 Grain amaranth	玉米 Maize	千穗谷Grain amaranth
A_c-max	59.12	69.97	-	-
R_n	2.86	1.32	3.27	3.17
R_d	1.43	0.66	0.24	0.28
R_e	1.43	0.66	3.02	2.89
J_max	262.41	393.07	-	-
J₀	-	-	22.22	27.43
J_c	242.20	282.52	0.96	1.12
J_a	20.21	110.55	21.26	26.31
J°_c	247.92	285.16	13.08	12.68
J°_a	14.49	107.91	9.14	14.75

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

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