Study on photosynthetic characteristics of four pecan cultivars

doi:10.12302/j.issn.1000-2006.202104040

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5): 67-74.doi: 10.12302/j.issn.1000-2006.202104040

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Study on photosynthetic characteristics of four pecan cultivars

TIAN Mengyang¹(), DOU Quanqin²^,^*(), XIE Yinfeng¹^,^*(), TANG Wenhua¹, JI Yanhong¹

1. Co-Innovation Center for 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:2021-04-23 Revised:2021-06-16 Online:2022-09-30 Published:2022-10-19
Contact: DOU Quanqin,XIE Yinfeng E-mail:13803819054@163.com;douqq2008@163.com;xxyyff@njfu.edu.cn

Abstract

Abstract:

【Objective】The photosynthetic and growth characteristics of four pecan cultivars ‘Mochou’ ‘Caddo’ ‘Shaoxing’ and ‘Wichita’ were investigated to provide a scientific basis for their breeding and popularization. 【Method】Diurnal changes in photosynthesis, the light response curve, chlorophyll fluorescence and the growth parameters of five years old plants from the four grafted cultivars were investigated, and the degree of correction for these factors was analyzed.【Result】In late July, the diurnal changes in photosynthesis for the four cultivars showed single peak changes. The peak and average values for the net photosynthetic rate (P_n) of ‘Shaoxing’ were significantly higher than those of the other three cultivars. The main factors affecting P_n were found to be photosynthetically active radiation (PAR), the transpiration rate (T_r) and stomatal conductance (G_s). Analysis of the light response parameters showed that the maximum net photosynthetic rate (P_{n, max}) and the light saturation point (P_LSP) of ‘Shaoxing’ were significantly higher than for the other three cultivars, while the light compensation point (P_LCP) and the respiration rate (R_d) were lower than the other cultivars. The PSⅡ of ‘Shaoxing’ had the highest photochemical quantum yield (F_v/F_m) and potential photochemical activity (F_v/F₀), followed by ‘Mochou’. Correlation analysis showed that there was a significant correlation between the fluorescence parameters and the characteristic parameters for the light response curve. F_v/F_m and F_v/F₀ were significantly correlated with P_{n, max}, and the ground diameter was highly significantly correlated with P_{n, max}.【Conclusion】All four pecan cultivars have a strong ability to adapt to strong light and high temperatures. ‘Shaoxing’ has the strongest growth adaptability, followed by ‘Mochou’. There is an strong positive correlation between the growth and photosynthetic performance during summer. The better photosynthetic performance of ‘Shaoxing’ is mainly manifested in its high photochemical efficiency and wide light intensity use ability.

Key words: pecan (Carya illinoinensis), photosynthetic characteristics, light response curves, chlorophyll fluorescence, growth parameter

CLC Number:

S718

TIAN Mengyang, DOU Quanqin, XIE Yinfeng, TANG Wenhua, JI Yanhong. Study on photosynthetic characteristics of four pecan cultivars[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(5): 67-74.

Figures/Tables 9

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Table 1

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品种 cultivar	G_s	C_i	T_r	T_a	光合有效辐射 PAR	H_R	C_a
‘莫愁’‘Mochou’	0.412	0.301	0.668	0.292	0.315	0.245	0.267
‘卡多’‘Caddo’	0.262	0.254	0.420	0.294	0.308	0.242	0.254
‘绍兴’‘Shaoxing’	0.564	0.284	0.548	0.287	0.299	0.257	0.320
‘威奇塔’‘Wichita’	0.363	0.303	0.399	0.274	0.287	0.298	0.282

品种 cultivar	η_AQY/ (mol·mol^-1)	P_LSP/ (μmol·m^-2·s^-1)	P_LCP/ (μmol·m^-2·s^-1)	P_n,max/ (μmol·m^-2·s^-1)	R_d/ (μmol·m^-2·s^-1)
‘莫愁’‘Mochou’	0.044±0.004 a	988.000±26.026 a	44.329±4.978 ab	9.681±0.342 ab	1.986±0.230 b
‘卡多’‘Caddo’	0.018±0.001 b	680.000±58.287 b	51.714±0.333 a	6.183±0.174 c	2.554±0.069 a
‘绍兴’‘Shaoxing’	0.050±0.002 a	1 177.333±218.004 a	37.425±4.055 b	10.660±0.297 a	1.914±0.043 b
‘威奇塔’‘Wichita’	0.027±0.008 b	748.000±20.000 b	56.322±2.667 a	7.455±0.925 bc	2.260±0.216 ab

品种cultivar	F₀	F_m	F_v/F_m	F_v/F₀
‘莫愁’‘Mochou’	333.000±10.440 c	1 954.333±80.603 b	0.825±0.003 a	4.715±0.106 a
‘卡多’‘Caddo’	443.000±6.429 a	2 231.000±41.861 a	0.801±0.004 b	4.026±0.109 b
‘绍兴’‘Shaoxing’	351.667±9.770 c	2 155.667±111.469 ab	0.829±0.003 a	4.840±0.090 a
‘威奇塔’‘Wichita’	409.000±2.887 b	2 135.083±55.210 ab	0.815±0.008 ab	4.432±0.241 ab

参数 parameter	F_v/F_m	F_v/F₀	η_AQY	P_LSP	P_LCP	P_n,max	R_d
F_v/F_m	1
F_v/F₀	0.998^**	1
η_AQY	0.885^**	0.887^**	1
P_LSP	0.635^**	0.645^**	0.807^**	1
P_LCP	-0.671^*	-0.684^*	-0.782^**	-0.772^*	1
P_n,max	0.761^**	0.767^**	0.736^**	0.776^*	-0.539	1
R_d	-0.768^**	-0.762^**	-0.667^*	-0.624^*	0.370	-0.578^*	1

品种 cultivar	苗高/m seedling height	地径/cm ground diameter
‘莫愁’‘Mochou’	5.067±0.033 b	10.900±0.436 a
‘卡多’‘Caddo’	5.000±0.058 b	8.567±0.371 b
‘绍兴’‘Shaoxing’	5.833±0.203 a	11.067±0.176 a
‘威奇塔’‘Wichita’	5.500±0.173 ab	9.333±0.120 b

Study on photosynthetic characteristics of four pecan cultivars

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参数 parameter	地径 ground diameter	苗高 seedling height	P_n,max	η_AQY	P_LSP	P_LCP	R_d
地径 ground diameters	1
苗高 seedling height	0.388	1
P_{n, max}	0.898^**	0.519	1
η_AQY	0.749^**	0.297	0.736^**	1
P_LSP	0.763^**	0.528	0.766^**	0.807^*	1
P_LCP	-0.468	-0.354	-0.539	-0.782^**	-0.772^*	1
R_d	-0.742^**	-0.226	-0.578^*	-0.667^*	-0.624^*	0.370	1