Photosynthetic characteristics of grafted plants of different Carya illinoinensis varieties

doi:10.3969/j.issn.1000-2006.201903004

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (3): 81-88.doi: 10.3969/j.issn.1000-2006.201903004

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Photosynthetic characteristics of grafted plants of different Carya illinoinensis varieties

TANG Wenhua¹(), DOU Quanqin²(), PAN Pingping¹, JI Yanhong¹, XIE Yinfeng¹()

^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:2019-03-01 Revised:2019-08-26 Online:2020-05-30 Published:2020-06-11
Contact: DOU Quanqin,XIE Yinfeng E-mail:1481971986@qq.com;douqq2008@163.com;xxyyff@njfu.edu.cn

Abstract

Abstract: Objective

To provide scientific basis for the selection and popularization of Carya illinoinensis varieties, an experiment was conducted to investigate the photosynthetic characteristics of six C. illinoinensis varieties, including ‘Forket’, ‘Western’, ‘Cape Fear’, ‘Moore’, ‘Sioux’ and ‘Apache’.

Method

The Li-6400 portable photosynthetic system and other equipment were used in the study. The photosynthetic physiological characteristics of the six varieties including diurnal variation of photosynthesis, light response curves, and chlorophyll fluorescence parameters were analyzed. The gas exchange and fluorescence parameters were analyzed together so that the photosynthetic physiological characteristics of the six varieties could be more comprehensively understood and identified. While analyzing the diurnal variation of photosynthesis, the reasons for midday depression in photosynthesis were investigated. The extent of the influence of physiological and ecological factors on the net photosynthetic rate (P_n) was explored by grey relational analysis. Through grey relational analysis, the main factors that affected the P_n could be clearly found and understood, based on which accurate and appropriate measures could be taken to change certain factors to improve the photosynthetic capacity of the varieties. Correlation analysis was also used to analyze the light response and chlorophyll fluorescence parameters. The light response parameters were able to reflect the photosynthetic capacity of plants under ideal conditions in some ways and chlorophyll fluorescence parameters could reflect the photosynthetic potential of plants, and hence, they were recognized as molecular probes for photosynthetic analysis. The results of the correlation analysis could be used to understand the correlation between the fluorescence and light response parameters and to explore the internal cause of high light efficiency of the varieties from the perspective of photosynthetic mechanism.

Result

The diurnal variation of photosynthesis of ‘Moore’ was unimodal and the diurnal variation of the other five varieties was imodal. Limitation of non-stomatal factors was considered as the main reason for midday depression in photosynthesis in ‘Moore’. The peak values and average values of the P_n of ‘Western’ were significantly higher than those of the other five varieties. Through grey relational analysis, it was found that the diurnal variation of the P_n and grey relational analysis was different for different varieties. The varieties with poor diurnal variation in the P_n were more susceptible to physiological and ecological factors. The main physiological factors that affected the P_nof the six varieties were stomatal conductance (G_s) and transpiration rate (T_r), and the environmental factor that affected the P_nof the six varieties was atmospheric temperature (T_a). The results of the analysis of light response parameters revealed that the maximum net photosynthetic rate (P_{n, max}) and light saturation point (L_sp) of ‘Western’ were significantly higher than those of the other varieties, which meant that its adaptability to strong light was the best, followed by ‘Forket’. The light compensation point (L_cp) of ‘Forket’ was significantly lower than that of the other varieties, followed by ‘Western’. The results of the analysis of chlorophyll fluorescence parameters revealed that the apparent quantum efficiency (A_QY) and dark respiration rate (R_d) of ‘Western’ and ‘Forket’ were better than those of others, which meant that they were more adaptable to weak light. The PSⅡ maximum photochemical quantum yield (F_v/F_m) and potential photochemical activity (F_v/F₀) of ‘Western’ were the highest, followed by those of ‘Forket’. The F_v/F_mand F_v/F₀of ‘Moore’ were significantly lower than those of the other varieties. The correlation analysis showed that there was a significant correlation between the fluorescence parameters and characteristic parameters of the light response curve. The F_v/F_m and F_v/F₀ were positively correlated with P_n,max, which reflected the photosynthetic efficiency of the varieties.

Conclusion

The photosynthetic characteristics of six different varieties of C. illinoinensis were quite different. According to the results of this study, the photosynthetic characteristics of ‘Western’ were recognized as the best of all with the characteristics of ‘Forket’ being slightly inferior to those of ‘Western’. The characteristics of the other four varieties were average compared to those of ‘Western’ and ‘Forket’. It was clear that ‘Western’ and ‘Forket’ have a wide range of light adaptations and high photosynthetic efficiency and thus have a great potential for popularization and utilization.

Key words: Carya illinoinensis, diurnal variations of photosynthesis, light response curves, chlorophyll fluorescence

CLC Number:

S718

TANG Wenhua, DOU Quanqin, PAN Pingping, JI Yanhong, XIE Yinfeng. Photosynthetic characteristics of grafted plants of different Carya illinoinensis varieties[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(3): 81-88.

Figures/Tables 8

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Table1

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Table 2

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品种varieties	P_n关联度relatimal degree
品种varieties	G_s	C_i	T_r	T_a	P_AR	H_R	C_a
‘Forket’	0.804	0.597	0.774	0.732	0.721	0.643	0.688
‘Western’	0.848	0.580	0.910	0.720	0.691	0.651	0.689
‘Cape Fear’	0.925	0.577	0.885	0.773	0.580	0.637	0.698
‘Moore’	0.908	0.774	0.940	0.891	0.764	0.820	0.839
‘Sioux’	0.856	0.679	0.672	0.816	0.540	0.729	0.769
‘Apache’	0.859	0.708	0.724	0.786	0.512	0.758	0.774

品种varieties	A_QY/(mol·mol^-1)	R_d/(μmol·m^-2·s^-1)	P_n,max/(μmol·m^-2·s^-1)	L_sp/(μmol·m^-2·s^-1)	L_cp/(μmol·m^-2·s^-1)
‘Forket’	0.044±0.002 a	0.853±0.100 c	15.436±0.990 a	1 235.770±37.602 b	31.831±4.280 d
‘Western’	0.043±0.003 a	1.086±0.240 c	16.538±1.260 a	1 477.450±56.323 a	38.400±1.829 c
‘Cape Fear’	0.032±0.002 b	1.039±0.062 c	14.385±1.288 ab	1 263.941±49.069 b	46.422±2.764 b
‘Moore’	0.026±0.006 c	2.167±0.577 a	12.813±0.590 b	1 045.340±25.230 d	56.920±7.441 a
‘Sioux’	0.029±0.001b c	1.971±0.042 a	12.584±1.231 b	1 182.190±41.667 c	53.651±2.918 a
‘Apache’	0.038±0.002 ab	1.655±0.033 b	13.531±0.988 ab	996.821±33.720 d	45.851±3.183 b

品种varieties	叶绿素含量/(mg·g^-1) chlorophyll content			叶绿素a/b比值Chl a/b	F_o	F_m	F_v/F_m	F_v/F_o
品种varieties	Chla	Chlb	Ch1	叶绿素a/b比值Chl a/b	F_o	F_m	F_v/F_m	F_v/F_o
‘Forket’	2.388±0.224 ab	0.835±0.088 ab	3.223±0.311 ab	2.858±0.058 bc	502±44.748 ab	2620±264.809 a	0.806±0.030 a	4.272±0.870 a
‘Western’	2.776±0.112 a	0.955±0.050 a	3.731±0.162 a	2.906±0.040 b	490±13.571 ab	2652±292.859 a	0.813±0.021 a	4.411±0.559 a
‘Cape Fear’	2.257±0.061 b	0.726±0.038 b	2.983±0.097 b	3.111±0.093 a	529±22.666 a	2674±277.274 a	0.801±0.016 a	4.048±0.400 ab
‘Moore’	2.404±0.231 ab	0.860±0.100 ab	3.264±0.330 ab	2.797±0.076 bc	516±27.779 ab	2119±341.109 b	0.749±0.024 b	3.142±0.868 b
‘Sioux’	2.545±0.243 ab	0.939±0.110 a	3.484±0.353 ab	2.709±0.057 c	464±32.468 b	2097±119.894 b	0.778±0.016 ab	3.532±0.333 ab
‘Apache’	2.001±0.137 b	0.714±0.040 b	2.715±0.175 b	2.803±0.069 bc	506±33.538 ab	2022±179.074 b	0.789±0.056 ab	3.152±0.407 b

参数parameters	F_v/F_m	F_v/F_o	A_QY	R_d	P_n,max	L_sp	L_cp
F_v/F_m	1
F_v/F_o	0.840^*	1
A_QY	0.841^*	0.671	1
R_d	-0.915^*	-0.882^*	-0.788	1
P_n,max	0.843^*	0.884^*	0.853^*	-0.862^*	1
L_sp	0.718	0.914^*	0.504	-0.663	0.813^*	1
L_cp	-0.858^*	-0.735	-0.969^**	0.883^*	-0.845^*	-0.495	1

Photosynthetic characteristics of grafted plants of different Carya illinoinensis varieties

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