Analysis of Photosynthetic Characteristics and Assimilates Distribution of Three Olea europaea Varieties

doi:10.11924/j.issn.1000-6850.casb2023-0224

Abstract

Abstract:

The aim was to study the photosynthetic characteristics and assimilates distribution of Olea europaea. photosynthetic indexes and assimilates were measured with Li-6400XT photosynthetic instrument and carbon-13 isotope labeling. The results showed that, the diurnal variation of photosynthesis of the three varieties presented a bimodal curve and an obvious ‘midday depression’ phenomenon. The main factors affecting net photosynthetic rate were stomatal conductivity and air CO₂ concentration. The three O. europaea varieties were strong light demander. The light compensation point and light saturation point of the three O. europaea varieties were higher than general sun species. There were differences in photosynthetic parameters and CO₂ response curves parameters among the three varieties. ‘Foao’ and ‘Ezhi 8’ had a strong photosynthetic capability, a wide utilization range and a high utilization rate of light and CO₂. The photosynthetic assimilates mainly concentrated in leaves and the distribution rate was 39.52%-49.92% after the 72 hours of ¹³C isotope labeling. The photosynthetic assimilates concentrated in seeds was the least and the distribution rate was only 6.67%-8.18%.

Key words: Olea europaea, diurnal variation of photosynthesis, relevant parameters of photosynthetic light response curve, relevant parameters of photosynthetic CO₂ response curve, photoassimilate partitioning

WANG Ruiwen, HUANG Ying, ZHENG Jingjin, JIANG Dezhi, HUANG Faxin. Analysis of Photosynthetic Characteristics and Assimilates Distribution of Three Olea europaea Varieties[J]. Chinese Agricultural Science Bulletin, 2024, 40(7): 20-26.

Figures/Tables 13

References 31

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品种	Pn与生理因子关联度				Pn与环境因子关联度
品种	Gs	Ci	Tr	WUE	PAR	Ta	RH	Ca
佛奥	0.92	0.75	0.48	0.67	0.60	0.81	0.75	0.92
莱星	0.97	0.85	0.52	0.67	0.66	0.71	0.68	0.81
鄂植8号	0.75	0.66	0.68	0.71	0.63	0.56	0.54	0.65

品种	Pn与生理因子关联度				Pn与环境因子关联度
品种	Gs	Ci	Tr	WUE	PAR	Ta	RH	Ca
佛奥	0.92	0.75	0.48	0.67	0.60	0.81	0.75	0.92
莱星	0.97	0.85	0.52	0.67	0.66	0.71	0.68	0.81
鄂植8号	0.75	0.66	0.68	0.71	0.63	0.56	0.54	0.65

品种	最大净光合速率/ [μmol/(m²·s)]	暗呼吸速率/ [μmol/(m²·s)]	光补偿点/ [μmol/(m²·s)	光饱和点/ [μmol/(m²·s)]	表观量子效率	线性拟合的判定系数
佛奥	28.39±0.56a	2.11±0.24 a	37.66±1.37b	1203.78±20.96a	0.07±0.002a	0.952
莱星	26.80±0.30b	0.50±0.13b	31.52±3.26c	831.66±15.43c	0.02±0.006c	0.935
鄂植8号	28.76±0.48a	0.32±0.05b	62.88±5.13a	966.72±31.86b	0.05±0.004b	0.975

品种	最大净光合速率/ [μmol/(m²·s)]	暗呼吸速率/ [μmol/(m²·s)]	光补偿点/ [μmol/(m²·s)	光饱和点/ [μmol/(m²·s)]	表观量子效率	线性拟合的判定系数
佛奥	28.39±0.56a	2.11±0.24 a	37.66±1.37b	1203.78±20.96a	0.07±0.002a	0.952
莱星	26.80±0.30b	0.50±0.13b	31.52±3.26c	831.66±15.43c	0.02±0.006c	0.935
鄂植8号	28.76±0.48a	0.32±0.05b	62.88±5.13a	966.72±31.86b	0.05±0.004b	0.975

品种	最大净光合速率/ [μmol/(m²·s)]	羧化效率/ [mol/(m²·s)]	光呼吸速率/ [μmol/(m²·s)]	CO₂补偿点/ [μmol/(m²·s)]	CO₂饱和点/ [μmol/(m²·s)]	线性拟合的判定系数
佛奥	28.035±3.478a	0.037±0.005a	2.101±0.655a	28.034±0.653b	1518.836±34.156b	0.983
莱星	27.583±1.952b	0.018±0.003b	0.904±0.327b	36.246±0.912a	793.815±20.634c	0.935
鄂植8号	27.163±6.249b	0.016±0.008b	2.311±0.499a	24.427±0.361c	1673.253±41.533a	0.927