Effects of long-term magnesium stress on chlorophyll fluorescence characteristics and antioxidant properties of celery

doi:10.3969/j.issn.1004-1524.20230022

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (2): 295-307.DOI: 10.3969/j.issn.1004-1524.20230022

• Horticultural Science • Previous Articles Next Articles

Effects of long-term magnesium stress on chlorophyll fluorescence characteristics and antioxidant properties of celery

HU Lixia(), ZHANG Jing, GAO Yanqiang, MAO Erye, HAN Kangning, YANG Yan, XIE Jianming^*()

College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China

Received:2022-01-11 Online:2024-02-25 Published:2024-03-05

Abstract

Abstract:

In order to study the effects of long-term magnesium deficiency and magnesium excess stress on chlorophyll fluorescence characteristics and antioxidant system of celery, American celery was used as the material, and the Yamazaki total nutrient solution was used as the control (CK, 1.0 mmol·L^-1 Mg²⁺), magnesium deficiency (0, 0.5 mmol·L^-1) and magnesium excess (2.5 mmol·L^-1) treatments were set. After 65 days of treatment, the chlorophyll content, chlorophyll fluorescence parameters and antioxidant related indicators of celery were determined. The results showed that the chlorophyll content, the maximum photochemical efficiency (F_v/F_m) of PSⅡ, the photochemical quenching coefficient (qP), the photochemical quenching (qL), the photosynthetic electron transfer rate (ETR), the light energy absorbed per unit reaction center (ABS/RC) and the light energy absorbed per unit area (ABS/CSm) of celery leaves were significantly reduced by magnesium deficiency and magnesium excess stress, while the relative variable fluorescence (V_j) of J point, the dissipated energy per unit reaction center (DIo/RC), the thermal dissipation energy per unit area (DIo/CSm) were significantly increased, and the OJIP curve was significantly deformed. Excessive magnesium leads to the performance index (PI abs) based on the absorption of light energy, and the quantum yield of the electron transport flux from Q_A to Q_B (φEo) significantly decreased, and non-photochemical quenching (qN) significantly increased. The activities of phenylalanine ammonia-lyase (PAL), cinnamate hydroxylase (C4H), 4-coumaryl coenzyme A ligase (4CL) and the content of flavonoids in celery leaves were significantly increased under magnesium excess stress. The activities of superoxide dismutase (SOD), catalase (CAT) and ascorbic acid peroxidase (APX) in celery leaves and petioles decreased significantly under deficiency and excess stress of magnesium, while the contents of malondialdehyde (MDA), proline (Pro) and hydrogen peroxide (H₂O₂) increased significantly. The peroxidase (POD) activity of celery leaves was significantly increased and the content of superoxide anion was significantly decreased under magnesium deficiency stress. The effect of magnesium excess stress on chlorophyll fluorescence characteristics and antioxidant capacity of celery was significantly greater than that of magnesium deficiency stress.

Key words: celery, magnesium, chlorophyll fluorescence, phenolic metabolism, antioxidase

CLC Number:

S636.3

HU Lixia, ZHANG Jing, GAO Yanqiang, MAO Erye, HAN Kangning, YANG Yan, XIE Jianming. Effects of long-term magnesium stress on chlorophyll fluorescence characteristics and antioxidant properties of celery[J]. Acta Agriculturae Zhejiangensis, 2024, 36(2): 295-307.

Figures/Tables 12

References 47

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MgSO₄·7H₂O浓度 MgSO₄·7H₂O concentration/(mmol·L^-1)	F_v/F_m	Y(Ⅱ)	Y(NPQ)	NPQ	qN	qP	qL	ETR
0	0.719 ±0.001 c	0.578 ±0.003 a	0.144 ±0.002 a	0.129 ±0.002 a	0.451 ±0.005 ab	0.850 ±0.014 b	0.638 ±0.024 c	17.467 ±0.533 c
0.5	0.727 ±0.001 b	0.582 ±0.002 a	0.138 ±0.005 a	0.124 ±0.005 a	0.437 ±0.012 ab	0.869 ±0.012 b	0.694 ±0.020 bc	21.667 ±0.167 b
1.0 (CK)	0.752 ±0.001 a	0.590 ±0.005 a	0.115 ±0.010 a	0.095 ±0.009 a	0.356 ±0.023 b	0.920 ±0.005 a	0.811 ±0.009 a	24.600 ±0.208 a
2.5	0.729 ±0.003 b	0.485 ±0.017 b	0.190 ±0.035 a	0.176 ±0.036 a	0.523 ±0.067 a	0.872 ±0.010 b	0.726 ±0.012 b	18.267 ±0.775 c

MgSO₄·7H₂O浓度 MgSO₄·7H₂O concentration/(mmol·L^-1)	F_v/F_m	Y(Ⅱ)	Y(NPQ)	NPQ	qN	qP	qL	ETR
0	0.719 ±0.001 c	0.578 ±0.003 a	0.144 ±0.002 a	0.129 ±0.002 a	0.451 ±0.005 ab	0.850 ±0.014 b	0.638 ±0.024 c	17.467 ±0.533 c
0.5	0.727 ±0.001 b	0.582 ±0.002 a	0.138 ±0.005 a	0.124 ±0.005 a	0.437 ±0.012 ab	0.869 ±0.012 b	0.694 ±0.020 bc	21.667 ±0.167 b
1.0 (CK)	0.752 ±0.001 a	0.590 ±0.005 a	0.115 ±0.010 a	0.095 ±0.009 a	0.356 ±0.023 b	0.920 ±0.005 a	0.811 ±0.009 a	24.600 ±0.208 a
2.5	0.729 ±0.003 b	0.485 ±0.017 b	0.190 ±0.035 a	0.176 ±0.036 a	0.523 ±0.067 a	0.872 ±0.010 b	0.726 ±0.012 b	18.267 ±0.775 c

MgSO₄·7H₂O浓度 MgSO₄·7H₂O concentration/(mmol·L^-1)	V_i	V_j	S_m	PI abs	φP_o	φE_o	φR_o	dV/dto
0	0.903 ±0.087 a	0.579 ±0.004 a	17.221 ±0.920 a	1.783 ±0.082 ab	0.851 ±0.004 a	0.358 ±0.004 a	0.082 ±0.007 b	1.144 ±0.017 a
0.5	0.875 ±0.005 ab	0.582 ±0.009 a	18.144 ±0.608 a	1.900 ±0.055 a	0.840 ±0.003 a	0.363 ±0.015 a	0.105 ±0.004 ab	1.140 ±0.065 a
1.0 (CK)	0.865 ±0.008 b	0.543 ±0.006 b	18.706 ±0.562 a	1.980 ±0.107 a	0.843 ±0.002 a	0.385 ±0.005 a	0.113 ±0.006 a	1.046 ±0.035 a
2.5	0.894 ±0.006 ab	0.606 ±0.007 a	15.936 ±0.529 a	1.480 ±0.079 b	0.844 ±0.004 a	0.320 ±0.007 b	0.090 ±0.005 ab	1.223 ±0.040 a

MgSO₄·7H₂O浓度 MgSO₄·7H₂O concentration/(mmol·L^-1)	V_i	V_j	S_m	PI abs	φP_o	φE_o	φR_o	dV/dto
0	0.903 ±0.087 a	0.579 ±0.004 a	17.221 ±0.920 a	1.783 ±0.082 ab	0.851 ±0.004 a	0.358 ±0.004 a	0.082 ±0.007 b	1.144 ±0.017 a
0.5	0.875 ±0.005 ab	0.582 ±0.009 a	18.144 ±0.608 a	1.900 ±0.055 a	0.840 ±0.003 a	0.363 ±0.015 a	0.105 ±0.004 ab	1.140 ±0.065 a
1.0 (CK)	0.865 ±0.008 b	0.543 ±0.006 b	18.706 ±0.562 a	1.980 ±0.107 a	0.843 ±0.002 a	0.385 ±0.005 a	0.113 ±0.006 a	1.046 ±0.035 a
2.5	0.894 ±0.006 ab	0.606 ±0.007 a	15.936 ±0.529 a	1.480 ±0.079 b	0.844 ±0.004 a	0.320 ±0.007 b	0.090 ±0.005 ab	1.223 ±0.040 a

MgSO₄·7H₂O浓度 MgSO₄·7H₂O concentration/(mmol·L^-1)	ABS/RC	DIo/RC	TRo/RC	ETo/RC	ABS/CSm	DIo/CSm	TRo/CSm	ETo/CSm
0	2.307 ±0.014 b	0.379 ±0.004 a	1.965 ±0.010 ab	0.838 ±0.011 a	3 144 ±45.764 b	527 ±4.410 a	2 664 ±45.622 a	1 145 ±29.008 a
0.5	2.293 ±0.032 b	0.374 ±0.001 a	1.919 ±0.031 b	0.864 ±0.019 a	3 183 ±38.886 b	492 ±6.557 b	2 687 ±49.319 a	1 184 ±64.506 a
1.0 (CK)	2.395 ±0.007 a	0.343 ±0.005 b	2.041 ±0.034 a	0.882 ±0.013 a	3 373 ±66.419 a	472 ±3.512 b	2 784 ±68.280 a	1 254 ±25.829 a
2.5	2.308 ±0.026 b	0.381 ±0.004 a	1.980 ±0.027 ab	0.829 ±0.054 a	3 138 ±71.445 b	542 ±10.333 a	2 657 ±66.494 a	1 113 ±93.512 a

Effects of long-term magnesium stress on chlorophyll fluorescence characteristics and antioxidant properties of celery

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