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Photochemical efficiency and growth of soursop rootstocks subjected to salt stress and hydrogen peroxide

1 Irrigation and Salinity Laboratory, Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, PB, Brazil
2 Department of Sciences and Agrifood Technology, Federal University of Campina Grande, Pombal, PB, Brazil
3 Center of Agrarian, Biological and Environmental Science, Federal University of Reconcavo Bahiano, Cruz das Almas, BA, Brazil
4 Department of Science and Technology of UFERSA, Federal Rural University of Semi-arid, Caraúbas-RN, Brazil

Hydrogen peroxide has been used in agriculture as a way to minimize the negative effects caused by biotic and abiotic stresses on plants. Thus, the objective of this study was to evaluate the mitigating effect of hydrogen peroxide on chlorophyll a fluorescence and growth of soursop subjected to salt stress in the rootstock production phase. The study was conducted in plastic bags under greenhouse conditions. The treatments were distributed in randomized blocks, in a 5 × 2 factorial arrangement, corresponding to five levels of irrigation water electrical conductivity—ECw (0.6; 1.2; 1.8; 2.4 and 3.0 dS m-1) and two concentrations of hydrogen peroxide—H2O2 (0 and 20 μM), with four replicates and two plants per plot. Irrigation water salinity hamper the quantum efficiency of photosystem II in soursop plants, at 120 days after sowing and it inhibits the growth of rootstocks in the period from 80 to 140 days after sowing. Hydrogen peroxide applications at concentration of 20 μM minimized the negative effects of salinity on the soursop initial fluorescence and favored the variable fluorescence and quantum efficiency of PSII.
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