Use of hydrogen peroxide for acclimation of sorghum plants to salt stress

Barbosa, Joicy L.; Limão, Marcelo A. R.; Medeiros, Aldair de S.; Pimenta, Thiago A.; Gonzaga, Giordano B. M.

doi:10.1590/1983-21252023v36n415rc

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Agricultural Engineering • Rev. Caatinga 36 (4) • Oct-Dec 2023 • https://doi.org/10.1590/1983-21252023v36n415rc copy

Use of hydrogen peroxide for acclimation of sorghum plants to salt stress

Uso de peróxido de hidrogênio na aclimatação do sorgo ao estresse salino

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The use of chemical conditioners, such as hydrogen peroxide (H₂O₂), is important for mitigating deleterious effects caused by salt stress on plants. This practice can increase the production of agricultural crops, including sorghum, in the Semiarid region of Brazil. In this sense, the objective of this study was to evaluate effects of different electrical conductivities of the irrigation water and H₂O₂ concentrations on plant growth and biomass accumulation of sorghum plants grown in the Semiarid region of Brazil. The experiment was conducted from November 2020 to January 2021 in a greenhouse at the Center for Agri-Food Sciences and Technologies of the Federal University of Campina Grande, in Pombal, Paraiba, Brazil. A randomized block experimental design was used, in a 4×4 factorial arrangement, consisted of four electrical conductivities of the irrigation water [0.30 (control), 1.50, 3.50, and 5.50 dS m^-1] and four H₂O₂ concentrations [0 (control), 6, 12, and 18 µM], with three replications and one plant per plot, totaling 48 experimental units. Plant height, stem diameter, flag leaf length, and fresh and dry weights of leaves and stems were evaluated. The results showed that applying irrigation water with electrical conductivities higher than 1.50 dS m^-1 decreases plant growth and biomass accumulation in sorghum plants. Treating sorghum seeds with H₂O₂ concentrations of up to 12 µM mitigates adverse effects caused by salt stress on sorghum plants subjected to the salinity levels evaluated in the present study.

Keywords
Sorghum bicolor (L.) Moench; H₂O₂; Brackish water; Semiarid region

Chemical attributes
pH	P	_K+	Na⁺	H⁺+Al⁺³	_Ca+2		_Mg+2	SB	CEC	OM
pH	(mg dm^-3)	cmol_c dm^-3								g kg^-1
6.5	6.14	0.37	0.07	0.81	1.20		0.71	2.28	3.09	4.79
Physical attributes
	Particles (g kg^-1)		Density (g cm^-3)		Porosity (%)				Texture
Sand	Silt	Clay	Soil	Particle	Porosity (%)				Sandy-loam
851	99	50	1.26	2.71		53.50			Sandy-loam

Source of variation	DF	Mean squares
Source of variation	DF	PH	SD	FLL
ECw	3	6213.50^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	71.49^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	155.81^ns ns and
Linear regression	1	17673.08^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	103.43^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	345.60^ns ns and
Quadratic regression	1	862.75^ns ns and	89.65 ^ns ns and	67.68^ns ns and
H₂O₂	3	2837.47^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	31.55^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	874.34^ = not significant and significant at p ≤ 0.01 by the F test, respectively.
Linear regression	1	4828.55^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	0.04^ns ns and	300.38^ns ns and
Quadratic regression	1	84.00^ns ns and	81.90^ = not significant and significant at p ≤ 0.01 by the F test, respectively.	2146.68^ = not significant and significant at p ≤ 0.01 by the F test, respectively.
Interaction (ECw × H₂O₂)	9	1107.39^ns ns and	3.55^ns ns and	62.96^ns ns and
Blocks	2	308.31	5.35	143.34
CV (%)	-	11.60	12.09	13.08

Source of variation	DF			Mean squares
		LFW	LDW	SFW	SDW
ECw	3	81.83^ns ns ,	76.53^* * = not significant and significant at p ≤ 0.01 and p ≤ 0.05 by the F test, respectively.	21006.59^ , and	10690.60^ns ns ,
Linear regression	1	166.66^ns ns ,	191.42^* * = not significant and significant at p ≤ 0.01 and p ≤ 0.05 by the F test, respectively.	51627.84^ , and	25240.83^ns ns ,
Quadratic regression	1	16.10^ns ns ,	25.40^ns ns ,	11327.07^* * = not significant and significant at p ≤ 0.01 and p ≤ 0.05 by the F test, respectively.	2024.10^ns ns ,
H₂O₂	3	1725.13^ , and	173.72^ , and	13002.25^ , and	4319.09^ , and
Linear regression	1	3360.46^ns ns ,	172.41^ns ns ,	21767.29^ , and	8466.63^ns ns ,
Quadratic regression	1	1277.40^ , and	337.39^ , and	13950.31^ , and	1533.41^ , and
Interaction (ECw × H₂O₂)	9	180.78^ns ns ,	30.08^ns ns ,	3888.89^* * = not significant and significant at p ≤ 0.01 and p ≤ 0.05 by the F test, respectively.	4620.10^ns ns ,
Blocks	2	4.04	14.12	916.70	369.71
CV (%)	-	13.62	15.08	15.15	15.64

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[1] Conflict of interest: The authors declare no conflict of interest related to the publication of this manuscript.