Comparison of photosynthetic characteristics of two new Triadica sebifera varieties

doi:10.12302/j.issn.1000-2006.202003080

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1): 93-100.doi: 10.12302/j.issn.1000-2006.202003080

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Comparison of photosynthetic characteristics of two new Triadica sebifera varieties

XU Zhongqiu¹(), SUI Dezong²^,^*(), XIE Yinfeng¹^,^*(), WANG Junyi¹

1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
2. Jiangsu Academy of Forestry, Nanjing 210014, China

Received:2020-03-26 Accepted:2020-08-03 Online:2021-01-30 Published:2021-02-01
Contact: SUI Dezong,XIE Yinfeng E-mail:1923743340@qq.com;535122107@qq.com;xxyy@njfu.edu.cn

Abstract

Abstract:

【Objective】The photosynthetic characteristics of two new Triadica sebifera varieties ‘Haibin Feihong’ (‘Feihong’) and ‘Haibin Zijing’ (‘Zijing’) in summer were studied and compared. This provided a theoretical basis for the cultivation and application of new T. sebifera varieties. 【Method】The photosynthetic pigment content, diurnal variation of photosynthesis, light response curve and CO₂ response curve of 2-year-old grafted seedlings were measured under pot culture conditions, and a grey correlation analysis was conducted. 【Result】① The contents of chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoid (Car) and chlorophyll a/b (Chl a/b) of ‘Zijing’ were all higher than that of ‘Feihong’, and the differences in Chl a, Chl b and Car content were significant. ② The diurnal variation curves of the photosynthesis of the two cultivars in August were a typical single peak type, and there was no ‘noon break’ phenomenon. The daily mean and peak values of the net photosynthetic rate (P_n), stomatal conductance (G_s) and transpiration rate (T_r) of ‘Zijing’ were significantly higher than those of ‘Feihong’, while the intercellular CO₂ concentration (C_i) was the opposite. The grey correlation analysis showed that the main environmental factors affecting the two varieties of P_n were atmospheric temperature (T_a) and light intensity (PAR). Compared with ‘Feihong’, P_n was more related to T_a, but less to atmospheric CO₂ concentration (C_a) in ‘Zijing’. ③ The maximum net photosynthetic rate (P_n,max), light saturation point (LSP), dark respiration rate (R_d) and light compensation point LCP) of ‘Zijing’ were all higher than those of the ‘Feihong’, and the apparent quantum efficiency (AQY) was lower than that of the ‘Feihong’, in which P_n,max, LSP and R_d were significantly different. ④ The maximum photosynthetic capacity (A_n,max), CO₂ saturation point (CSP), carboxylation efficiency (CE) and light absorption rate (R_p) of the ‘Zijing’ were higher than those of ‘Feihong’, the CO₂ compensation point (CCP) was smaller than that of the ‘Feihong’, and there were significant differences between A_n,max and CSP. 【Conclusion】The two new varieties of S. sebiferum showed strong adaptability to summer growth in terms of photosynthetic characteristics. Compared with ‘Feihong’, ‘Zijing’ had the best photosynthetic performance and better adaptability to high temperature and strong light. Its stronger photosynthetic capacity is related to its relatively small non-stomatal limitation. The higher carboxylation efficiency and RUBP regeneration ability may be the main reason for the improvement of non-stomatal limitation by ‘Zijing’. Photorespiration may be a mechanism to avoid light suppression and light destruction under high temperature and strong light.

Key words: new varieties of Triadica sebifera, diurnal variation of photosynthesis, light response curve, CO₂ response curve

CLC Number:

S718

XU Zhongqiu, SUI Dezong, XIE Yinfeng, WANG Junyi. Comparison of photosynthetic characteristics of two new Triadica sebifera varieties[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(1): 93-100.

Figures/Tables 7

Table 1

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品种 varieties	叶绿素a/ (mg·g^-1) Chl a	叶绿素b/ (mg·g^-1) Chl b	叶绿素a/b Chl a/Chl b	类胡萝卜素/ (mg·g^-1) carotenoid
‘海滨绯红’ ‘Haibin Feihong’	1.375±0.002 b	0.496±0.003 b	2.772±0.026 a	0.597±0.001 b
‘海滨紫晶’ ‘Haibin Zijing’	1.507±0.026 a	0.518±0.004 a	2.910±0.077 a	0.728±0.002 a

品种 varieties	P_n关联度 relatimal degree
品种 varieties	T_r	C_i	G_s	T_a	光合有效辐射 PAR	φ	C_a
‘海滨绯红’ ‘Haibin Feihong’	0.876	0.577	0.872	0.885	0.858	0.580	0.623
‘海滨紫晶’ ‘Haibin Zijing’	0.879	0.592	0.819	0.903	0.859	0.579	0.605

品种 varieties	P_n,max/ (μmol·m^-2·s^-1)	表观量子效率/ (mol·mol^-1) AQY	R_d/ (μmol·m^-2·s^-1)	光补偿点/ (μmol·m^-2·s^-1) LCP	光饱和点/ (μmol·m^-2·s^-1) LSP	R²
‘海滨绯红’ ‘Haibin Feihong’	11.131±0.685 b	0.093±0.007 a	1.022±0.318 b	12.388±3.856 a	1092.497±40.028 b	0.997
‘海滨紫晶’ ‘Haibin Zijing’	13.436±0.818 a	0.089±0.005 a	1.591±0.138 a	18.909±1.530 a	1602.780±71.216 a	0.997

品种 varieties	A_n,max/ (μmol·m^-2·s^-1)	羧化效率/ (mol·m^-2·s^-1) CE	R_p/ (μmol·m^-2·s^-1)	CO₂补偿点/ (μmol·mol^-1) CCP	CO₂饱和点/ (μmol·mol^-1) CSP	R²
‘海滨绯红’ ‘Haibin Feihong’	18.591±1.305 b	0.034±0.008 a	4.036±0.232 a	128.206±24.243 a	1 366.167±60.715 b	0.987
‘海滨紫晶’ ‘Haibin Zijing’	22.445±0.882 a	0.037±0.121 a	4.171±0.662 a	119.252±14.500 a	1 542.790±62.312 a	0.993

Comparison of photosynthetic characteristics of two new Triadica sebifera varieties

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