H<sub>2</sub>O<sub>2</sub> as attenuator of salt stress on the physiology and growth of hydroponic cherry tomato

Guedes, Maria A.; Lima, Geovani S. de; Gheyi, Hans R.; Soares, Lauriane A. dos A.; Silva, Luderlândio de A.; Oliveira, Valeska K. N.; Brito, Larissa A.; Silva, André A. R. da

doi:10.1590/1983-21252024v3712002rc

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Scientific Article • Rev. Caatinga 37 • 2024 • https://doi.org/10.1590/1983-21252024v3712002rc copy

H₂O₂ as attenuator of salt stress on the physiology and growth of hydroponic cherry tomato

H₂O₂ como atenuante do estresse salino na fisiologia e crescimento de tomate cereja hidropônico

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In arid and semi-arid regions, agricultural production is challenging due to the scarcity of water for irrigation, so brackish water is commonly used. However, the use of these waters negatively affects the growth and development of crops. In this context, it is essential to look for strategies to mitigate the effects of salt stress on plants. The objective of this study was to evaluate the effects of foliar application of H₂O₂ on gas exchange, photosynthetic pigments, photochemical efficiency, and growth of cherry tomato plants in hydroponic cultivation with saline nutrient solution. The experiment was carried out in a greenhouse in Pombal-PB, using a Nutrient Film Technique (NFT) hydroponic system. Treatments were distributed in a split-plot scheme, in which the levels of electrical conductivity of the nutrient solution - ECns (2.1, 2.8, 3.5, and 4.2 dS m^-1) were considered the plots and the five concentrations of H₂O₂ (0, 12, 24, 36, and 48 μM) were considered the subplots, with six replicates and two plants per plot. ECns from 2.1 dS m^-1 reduced gas exchange, photochemical efficiency, photosynthetic pigments, relative water content, and growth of cherry tomato. H₂O₂ at concentrations of 36 and 48 μM associated with saline nutrient solution of 2.1 dS m^-1 stimulated plant height, growth, and chlorophyll b synthesis, respectively. Hydrogen peroxide alone did not affect gas exchange, chlorophyll fluorescence, photosynthetic pigments, and growth of cherry tomato.

Keywords:
Solanum lycopersicum ; Acclimatization; Nutrient solution

Nutrients	Fertilizers	Quantity (g 1000L^-1)
P/K	KH₂PO₄	136.09
K/N	KNO₃	101.10
Ca /N	Ca (NO₃)₂.4H₂O	236.15
Mg	MgSO₄.4H₂O	246.49
B	H₃BO₃	3.10
Mn	MnSO₄.4H₂O	1.70
Zn	ZnSO₄.7H₂O	0.22
Cu	CuSO₄	0.75
Mo	(NH₄)₆Mo₇O₂₄. 4H₂O	1.25
	EDTA – Na	13.9
Fe	FeSO₄	13.9

Sources of Variation	DF	Mean squares
Sources of Variation	DF	gs	E	A	Ci	WUE	CEi	WUEi
Saline nutrient solution (ECns)	3	0.0092^*	1.623*	22.57**	6719.12**	0.799 ^ns	0.00012**	1387.0**
Linear regression	1	0.0096^**	4.06**	57.80**	14967.2**	2.36 ^ns	0.00035**	38.72**
Quadratic regression	1	0.00023^*	0.60*	9.93^ns	4593.7**	0.00^ns	0.00073^ns	83.66**
Residual 1	6	0.0025	0.060	0.409	31.06	0.016	0.00015	5.44
Hydrogen peroxide (H₂O₂)	4	0.0071^*	0.672^ns	1.077^ns	645.27*	0.309 ^ns	0.00018^ns	568.3**
Linear regression	1	0.0018^*	1.65^ns	2.67*	1044.3**	0.91 ^ns	0.00013^ns	38.07*
Quadratic regression	1	0.009^*	0.05^ns	0.71^ns	656.09**	0.01^ns	0.00010*	1191.7**
Interaction (ECns × H₂O₂)	12	0.0029^*	0.179^ns	0.858^ns	175.14*	0.039^ns	0.00014^ns	118.84**
Residual 2	34	0.0066	0.270	1.091	96.42	0.021	0.00011	37.85
CV 1(%)		5.57	6.56	10.57	2.17	7.89	14.17	5.89
CV 2(%)		5.25	13.92	17.25	3.82	8.90	14.90	15.77

Sources of Variation	DF	Mean squares
Sources of Variation	DF	F₀	F_m	F_v	F_v/F_m	F_v/F₀
Saline nutrient solution (ECns)	3	2206.7^ns	3883.3**	2117.6**	0.004^ns	0.109^ns
Linear regression	1	5401.7^ns	11445.3**	6311.2**	0.014**	0.3181^ns
Quadratic regression	1	62.0^ns	120.4^ns	19.26^ns	0.000^ns	0.001^ns
Residual 1	6	89.76	101.1	14.57	0.000	0.058
Hydrogen peroxide (H₂O₂)	4	26.94^ns	743.8^ns	524.41^ns	0.002^ns	1.995^ns
Linear regression	12	16.13^ns	800.8^ns	73.63^ns	0.003^ns	5.106^ns
Quadratic regression	1	66.88^ns	1030.0^ns	257.52^ns	0.004^ns	0.991^ns
Interaction (ECns × H₂O₂)	12	407.85^ns	262.5^ns	24.07^ns	0.000^ns	0.055^ns
Residual 2	34	47.39	136.30	575.40	0.000	0.042
CV 1(%)		6.87	1.79	0.86	1.93	7.51
CV 2(%)		4.99	2.08	5.43	2.84	6.44

Sources of Variation	DF	Mean squares
Sources of Variation	DF	Chl a	Chl b	Chl a/b	Chl T	Car	RWC
Saline nutrient solution (ECns)	3	0.008^**	0.004**	0.730 ^ns	0.028^ns	0.00073^ns	387.52**
Linear regression	1	0.023^**	0.012**	2.14**	0.085**	0.00027*	986.2**
Quadratic regression	1	0.001^**	0.000^ns	0.028^ns	0.00001^ns	0.00013^ns	154.2**
Residual 1	6	0.000	0.000	0.019	0.001	0.00029	4.69
Hydrogen peroxide (H₂O₂)	4	0.003^**	0.003**	0.391^ns	0.0036^ns	0.00018^ns	20.57^ns
Linear regression	1	0.000^ns	0.002**	0.448^ns	0.007^ns	0.00012^ns	0.198^ns
Quadratic regression	1	0.000^*	0.000**	0.781^ns	0.00001^ns	0.00010^ns	80.20**
Interaction (ECns × H₂O₂)	12	0.001^**	0.000*	0.051^ns	0.002^ns	0.00024^ns	14.10^ns
Residual 2	34	0.000	0.000	0.029	0.001	0.00052	15.88
CV 1(%)		3.59	6.76	6.22	11.72	6.10	3.80
CV 2(%)		8.81	10.30	7.59	12.08	9.58	6.62

Sources of Variation	DF	Mean squares
Sources of Variation	DF	PH	SD	NL	LDM	SDM	RDM
Saline nutrient solution (ECns)	3	1014.8^**	18.82^*	60.977^ns	10.675^ns	16.770^*	6.46^*
Linear regression	6	2914.0^**	51.79^**	0.000^ns	14.822^ns	36.45**	11.46^*
Quadratic regression	1	120.41^ns	2.59^ns	117.60^ns	5.787^ns	10.79*	0.277^ns
Residual 1	1	20.62	0.978	16.09	2.691	1.662	0.61
Hydrogen peroxide (H₂O₂)	4	36.54^ns	0.857^ns	22.566^ns	3.294^ns	3.149^ns	1.41^ns
Linear regression	1	0.208^ns	0.001^ns	0.033^ns	1.961^ns	0.741^ns	5.24^ns
Quadratic regression	1	118.33^ns	1.537^ns	14.880^ns	7.978^ns	7.86^ns	0.08^ns
Interaction (ECns × H₂O₂)	12	88.87^*	1.632^ns	17.144^ns	8.194^ns	3.358^ns	1.42^ns
Residual 2	34	27.00	0.525	6.395	3.205	0.926	0.57
CV 1(%)		6.47	10.84	11.85	9.72	10.15	11.07
CV 2(%)		7.40	7.94	7.47	10.60	7.58	10.63

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E-mail: caatinga@ufersa.edu.br

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[1] *Corresponding author: <amandagueedscc@gmail.com>

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H2O2 as attenuator of salt stress on the physiology and growth of hydroponic cherry tomato

H2O2 como atenuante do estresse salino na fisiologia e crescimento de tomate cereja hidropônico

ABSTRACT

H₂O₂ as attenuator of salt stress on the physiology and growth of hydroponic cherry tomato

H₂O₂ como atenuante do estresse salino na fisiologia e crescimento de tomate cereja hidropônico