04187nab a2200301 i 4500003000900000005001700009008004100026040001800067072001400085072000800099100004000107100003200147100002800179100003800207100004000245245009500285500007700380520137700457520166401834650001303498650001903511650001803530650001103548650001303559650001703572773021803589856007803807BR-BrBNA20231204152858.0231204b2021    bl.qr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aH50b1105  aF60  aSilva, André Alisson Rodrigues da  aCapitulino, Jessica Dayanne  aLima, Geovani Soares de  aAzevedo, Carlos Alberto Vieira de  aVeloso, Luana Lucas de Sá Almeida  aTolerance to salt stress in soursop seedlings under different methods of H2O2  application  a
Publicação on-line; 28 ref.; 4 illus.; 3 tables; Summaries (En, Pt)  a

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 fi ve 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.  a

RESUMO - Objetivou-se com o presente trabalho, avaliar o efeito de diferentes métodos de aplicação de peróxido de
hidrogênio sobre a produção de biomassa e qualidade de mudas de gravioleira sob estresse salino. O estudo foi conduzido
em casa de vegetação, utilizando-se de um Neossolo Regolítico Psamitico de textura franco-arenosa. Os tratamentos foram
distribuídos em delineamento inteiramente casualizados, em arranjo fatorial 5 x 4, sendo cinco níveis de condutividade
elétrica da água de irrigação – CEa (0,6; 1,2; 1,8; 2,4 e 3,0 dS m-1) e quatro métodos de aplicação de peróxido de hidrogênio –
(Testemunha; aplicação por embebição das sementes; aplicação por pulverização e aplicação por embebição e pulverização),
com duas plantas por parcela e quatro repetições. A salinidade da água de irrigação a partir de 0,6 dS m-1 inibiu a produção de
biomassa seca e altera os índices morfofi siológicos foliares de mudas de gravioleira, aos 145 dias após o semeio; O método
de aplicação de peróxido de hidrogênio por embebição das sementes minimizou o efeito do estresse salino sobre a produção
de biomassa seca radicular e na qualidade das mudas de gravioleira e aumentou da suculência foliar, destacando-se como
mecanismo de tolerância ao estresse salino; A aplicação de peróxido de hidrogênio por embebição das sementes favoreceu
o aumento da relação raiz/parte aérea da gravioleira quando exposta a salinidade da água de irrigação.


Palavras-chave: Annona Muricata L. Águas salinas. Peróxido de hidrogênio.  aGRAVIOLA  aFRUTA TROPICAL  aÁGUA SALINA  aSTRESS  aBIOMASSA  aBIOQUÍMICA0 04290dFortaleza-CE Universidade Federal do Ceará. Centro de Ciências Agrárias 2002o2023-436724tRevista Ciência Agronômica (Brazil)x0045-6888; 1806-6690 (on-line)gv. 52(3) p. 1-9; (2021)wBR2023002122  uhttps://www.scielo.br/j/rca/a/v5fRDDFTcdm8cG7NwL5bx7Q/?format=pdf&lang=en