Tolerance to salt stress in soursop seedlings under different methods of H<sub>2</sub>O<sub>2</sub> application

Silva, André Alisson Rodrigues da; Capitulino, Jessica Dayanne; Lima, Geovani Soares de; Azevedo, Carlos Alberto Vieira de; Veloso, Luana Lucas de Sá Almeida

doi:10.5935/1806-6690.20210030

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Scientific Article • Rev. Ciênc. Agron. 52 (3) • 2021 • https://doi.org/10.5935/1806-6690.20210030 copy

Tolerance to salt stress in soursop seedlings under different methods of H₂O₂ application¹ 1 Parte da dissertação de Mestrado apresentada ao Curso de Pós-Graduação em Engenharia Agrícola, Universidade Federal de Campina Grande/UFCG, financiada pelo Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq

Tolerância ao estresse salino de mudas de gravioleira sob diferentes métodos de aplicação de H₂O₂

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The aim of this study was to evaluate the effect of different methods of hydrogen peroxide application on biomass production and quality in soursop seedlings under salt stress. The study was conducted in a greenhouse, in a Psammitic Regolithic Neosol of a sandy-loam texture. The treatments were distributed in a completely randomised design, in a 5 x 4 factorial scheme, with five levels of electrical conductivity for the irrigation water - ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m^-1) and four methods of hydrogen peroxide application (Control, application by soaking the seeds, application by spraying, and application by soaking and spraying), with two plants per plot and four replications. From 0.6 dS m^-1, the salinity of the irrigation water inhibited dry matter production and altered the leaf morpho-physiological index of the soursop seedlings 145 days after sowing. The method of hydrogen peroxide application by soaking the seeds minimised the effect of salt stress on root dry matter production and the quality of the soursop seedlings, and increased leaf succulence, standing out as a tolerance mechanism to salt stress. The application of hydrogen peroxide by soaking the seeds favoured an increase in the root to shoot ratio in soursop exposed to salinity of the irrigation water.

Key words:
Annona Muricata L; Saline water; Hydrogen peroxide

Chemical characteristics
pH (H₂O) (1:2. 5)	O.M. %	P (mg kg^-1)	K⁺	Na⁺	Ca²⁺	Mg²⁺	Al³⁺ + H⁺	PES (%)	ECse (dS m^-1)
pH (H₂O) (1:2. 5)	O.M. %	P (mg kg^-1)	.....................................(cmolckg^-1)...............................					PES (%)	ECse (dS m^-1)
5.90	1.36	6.80	0.22	0.16	2.60	3.66	1.93	1.87	1.0
Physical and hydraulic characteristics
Particle size fraction (dag kg^-1)			Textural class	Moisture (kPa)		AW	Total porosity %	Ds	PD
Sand	Silt	Clay	Textural class	33.42	1519.5 dag kg^-1	AW	Total porosity %	(g cm^-3)
73.29	14.21	12.50	FA	11.98	4.32	7.66	47.74	1.39	2.66

Source of variation	Mean square
Source of variation	LDM	STDM	SDM	RDM	TDM	R/S
Levels of salinity (LS)	9.53^ ,	4.09^ ,	2.54^ ,	7.62^ ,	55.65^ ,	0.24^ ,
Linear regression	37.25^ ,	16.31^ ,	9.64^ ,	29.08^ ,	220.29^ ,	0.59^ ,
Quadratic regression	0.11^ns ns ,	0.03^ns ns ,	0.22^ns ns ,	1.13^ns ns ,	0.86^ns ns ,	0.17^ns ns ,
Methods application (MA)	0.23^ns ns ,	0.11^ns ns ,	1.17^ ,	0.34^ ,	3.29^ns ns ,	0.09^ns ns ,
Interaction (LS x MA)	0.22^ns ns ,	0.12^ns ns ,	0.41^ ,	0.26^ ,	1.04^ns ns ,	0.21^ ,
Residual	0.13	0.04	0.07	0.08	0.14	0.04
CV (%)	25.85	22.05	8.28	27.99	10.93	32.19

Source of variation	Mean Square
Source of variation	SUC	SLA	LAR	DQI
Levels of salinity (LS)	91.79^ ,	345943.66^ ,	114410.79^ ,	2.96^ ,
Linear regression	352.12^ ,	992366.55^ ,	343572.19^ ,	11.58^ ,
Quadratic regression	1.47^ns ns ,	208000.27^ns ns ,	86346.87*	0.03^ns ns ,
Methods application (MA)	9.81^ ,	143560.06^ ,	41731.41^ ,	0.26^ ,
Interaction (LS x MA)	11.37^ ,	112212.56^ ,	19256.88^ ,	0.10^ ,
Residual	0.69	1883.41	295.60	0.01
CV (%)	16.69	10.44	10.17	11.67

Universidade Federal do Ceará Av. Mister Hull, 2977 - Bloco 487, Campus do Pici, 60356-000 - Fortaleza - CE - Brasil, Tel.: (55 85) 3366-9702 / 3366-9732, Fax: (55 85) 3366-9417 - Fortaleza - CE - Brazil
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Tolerância ao estresse salino de mudas de gravioleira sob diferentes métodos de aplicação de H2O2

ABSTRACT

Tolerância ao estresse salino de mudas de gravioleira sob diferentes métodos de aplicação de H₂O₂