Formation of guava seedlings under salt stress and foliar application of hydrogen peroxide

Silva, Saulo S. da; Lima, Geovani S. de; Ferreira, Jean T. A.; Soares, Lauriane A. dos A.; Gheyi, Hans R.; Nobre, Reginaldo G.; Silva, Fellype J. L. da; Mesquita, Evandro F. de

doi:10.1590/1807-1929/agriambi.v28n2e276236

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Original Article • Rev. bras. eng. agríc. ambient. 28 (2) • Feb 2024 • https://doi.org/10.1590/1807-1929/agriambi.v28n2e276236 copy

Formation of guava seedlings under salt stress and foliar application of hydrogen peroxide¹ 1 Research developed at Universidade Federal de Campina Grande, Centro de Ciências e Tecnologia Agroalimentar, Pombal, PB, Brazil

Formação de mudas de goiabeira sob estresse salino e aplicação foliar de peróxido de hidrogênio

Authorship SCIMAGO INSTITUTIONS RANKINGS

HIGHLIGHTS:

Application of hydrogen peroxide at up to concentration of 75 µM reduces the relative water content of leaf.

Gas exchange and synthesis of photosynthetic pigments are negatively affected by water salinity from 0.3 to 4.3 dS m^-1.

Hydrogen peroxide at concentrations of up to 75 µM does not attenuate the effects of salt stress on guava seedlings.

ABSTRACT

The occurrence of water with high concentrations of salts hinders the expansion of irrigated agriculture in the semi-arid region of the Brazilian Northeast, making it necessary to adopt strategies capable of minimizing the effects of salt stress on plants. In this context, the objective of present study was to evaluate the effects of hydrogen peroxide application on water relations, gas exchange, photosynthetic pigments, and growth of guava cv. Paluma under irrigation with saline waters in the seedling formation stage. A randomized block design was used, in a 5 × 4 factorial scheme, with three replicates, with five levels of electrical conductivity of water - ECw (0.3, 1.3, 2.3, 3.3, and 4.3 dS m^-1) and four concentrations of hydrogen peroxide - H₂O₂ (0, 25, 50, and 75 µM). Irrigation water salinity above 0.3 dS m^-1 increased electrolyte leakage in the leaf blade and reduced the relative water content, synthesis of photosynthetic pigments, gas exchange, and growth of seedlings of guava cv. Paluma, at 80 days after sowing. Foliar application of hydrogen peroxide at concentrations of up to 75 µM reduces the relative water content in the leaf blade of guava seedlings and did not mitigate the effects of salt stress on guava plants in the seedling formation stage.

Key words:
Psidium guajava L.; salinity; acclimatization

Chemical characteristics
pH (H₂O)		OM		P		K⁺		Na⁺		Ca²⁺		Mg²⁺		Al³⁺		H⁺
(1:2.5)		(g kg^-1)		(mg kg^-1)		(cmol_c kg^-1)
8.53		3.10		77.30		0.56		0.20		5.08		5.11		0		0
Chemical characteristics							Physical characteristics
EC_se	CEC		SAR_se		ESP		Particle-size fraction (g kg^-1)						Moisture (dag kg^-1)
(dS m^-1)	(cmol_c kg^-1)		(mmol L^-1)^0.5		(%)		Sand		Silt		Clay		33.42 kPa¹		1519.5 kPa²
0.46	10.95		1.02		1.83		775.70		180.90		43.40		12.45		5.00

Source of variation	DF	Mean squares
Source of variation	DF	%EL	RWC	Chl a	Chl b	Car	Chl T
Electrical conductivity of water (ECw)	4	63.17**	66.89*	102.87**	11.42**	175.50^ns	179.50**
Linear regression	1	240.38**	215.52**	358.94**	44.45**	51.94^ns	655.62**
Quadratic regression	1	0.91^ns	9.75^ns	8.17**	0.21^ns	250.85^ns	5.76**
Hydrogen peroxide (H₂O₂)	3	1.08^ns	60.21*	3.42^ns	0.96^ns	134.74^ns	7.54^ns
Linear regression	1	1.00^ns	152.72**	0.04^ns	0.26^ns	263.61^ns	0.53^ns
Quadratic regression	1	1.83	0.22^ns	9.07^ns	2.57^ns	122.98^ns	21.34^ns
Interaction (ECw × H₂O₂)	12	3.37^ns	21.83^ns	9.25^ns	3.35^ns	129.85^ns	23.19^ns
Blocks	2	3.71^ns	308.31**	40.11*	28.84**	168.65**	137.01**
Residual	38	2.69	20.32	7.72	2.52	142.21	18.30
CV (%)		13.70	5.21	15.19	27.40	18.23	17.76

Source of variation	DF	Mean squares
Source of variation	DF	gs¹	E	Ci	A¹	WUEi¹	CEi¹
Electrical conductivity of water (ECw)	4	0.021**	1.46**	9054.97**	127.11**	2.45^ns	0.0004^ns
Linear regression	1	0.080**	5.20**	33567.07**	439.87**	6.11^ns	0.00102^ns
Quadratic regression	1	0.001^ns	0.04^ns	70.72^ns	0.13^ns	0.02^ns	0.00001^ns
Hydrogen peroxide (H₂O₂)	3	0.001^ns	0.10^ns	254.77^ns	7.69^ns	0.07^ns	0.0004^ns
Linear regression	1	0.002^ns	0.19^ns	530.67^ns	11.06^ns	0.14^ns	0.0008^ns
Quadratic regression	1	0.001^ns	0.05^ns	36.81^ns	8.07^ns	0.04^ns	0.0001^ns
Interaction (ECw × H₂O₂)	12	0.003^ns	0.23^ns	612.50^ns	18.63^ns	4.90^ns	0.0005^ns
Blocks	2	0.008^ns	0.29^ns	8490.9**	1.22^ns	0.98^ns	0.0022^ns
Residual	38	0.004	0.19	1068.45	24.79	3.89	0.0009
CV (%)		14.32	14.57	16.71	16.10	17.89	17.79

Source of variation	DF	Mean squares
Source of variation	DF	AGR_PH	AGR_SD	AGR_LA	RGR_PH	RGR_SD	RGR_LA
Electrical conductivity of water (ECw)	4	0.1059**	0.0005*	45.4234*	0.00001^ns	0.00006^ns	0.000118^ns
Linear regression	1	0.3370**	0.0007**	133.41^ns	0.000001^ns	0.000008^ns	0.000001^ns
Quadratic regression	1	0.3325**	0.0008**	33.17**	0.000029^ns	0.000048^ns	0.000015^ns
Hydrogen peroxide (H₂O₂)	3	0.0245^ns	0.0002^ns	0.6731^ns	0.00001^ns	0.00001^ns	0.000006^ns
Linear regression	1	0.0458^ns	0.000033^ns	1.6383^ns	0.000048^ns	0.000001^ns	0.000083^ns
Quadratic regression	1	0.0040^ns	0.000007^ns	0.1118^ns	0.000001^ns	0.000002^ns	0.000002^ns
Interaction (ECw × H₂O₂)	12	0.0295^ns	0.0003^ns	9.3379^ns	0.00001^ns	0.00003^ns	0.000062^ns
Blocks	2	0.0891*	0.0002^ns	170.1010**	0.00001^ns	0.00001^ns	0.000327^ns
Residual	38	0.0240	0.0001	14.9472	0.00001	0.00002^ns	0.000069
CV (%)		20.76	30.57	38.63	20.87	41.35	32.95

Unidade Acadêmica de Engenharia Agrícola Unidade Acadêmica de Engenharia Agrícola, UFCG, Av. Aprígio Veloso 882, Bodocongó, Bloco CM, 1º andar, CEP 58429-140, Campina Grande, PB, Brasil, Tel. +55 83 2101 1056 - Campina Grande - PB - Brazil
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[1] * Corresponding author - E-mail: saulosoares90@gmail.com

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Formation of guava seedlings under salt stress and foliar application of hydrogen peroxide1 1 Research developed at Universidade Federal de Campina Grande, Centro de Ciências e Tecnologia Agroalimentar, Pombal, PB, Brazil

Formação de mudas de goiabeira sob estresse salino e aplicação foliar de peróxido de hidrogênio

HIGHLIGHTS:

ABSTRACT

Formation of guava seedlings under salt stress and foliar application of hydrogen peroxide¹ 1 Research developed at Universidade Federal de Campina Grande, Centro de Ciências e Tecnologia Agroalimentar, Pombal, PB, Brazil