Foliar H 2 O 2 Application Improve the Photochemical and Osmotic Adjustment of Tomato Plants Subjected to Drought

Gustavo Ribeiro Barzotto, Caroline Pardine Cardoso, Letícia Galhardo Jorge, Felipe Girotto Campos () and Carmen Sílvia Fernandes Boaro
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Gustavo Ribeiro Barzotto: School of Agriculture, São Paulo State University (UNESP), Campus Botucatu, Ave. Universitária, n° 3780-Altos do Paraíso, Botucatu 18610-034, SP, Brazil
Caroline Pardine Cardoso: Institute of Biosciences, São Paulo State University (UNESP), Campus Botucatu, Street Prof. Dr. Antonio Celso Wagner Zanin, 250-District de Rubião Junior, Botucatu 18618-689, SP, Brazil
Letícia Galhardo Jorge: Institute of Biosciences, São Paulo State University (UNESP), Campus Botucatu, Street Prof. Dr. Antonio Celso Wagner Zanin, 250-District de Rubião Junior, Botucatu 18618-689, SP, Brazil
Felipe Girotto Campos: Institute of Biosciences, São Paulo State University (UNESP), Campus Botucatu, Street Prof. Dr. Antonio Celso Wagner Zanin, 250-District de Rubião Junior, Botucatu 18618-689, SP, Brazil
Carmen Sílvia Fernandes Boaro: Institute of Biosciences, São Paulo State University (UNESP), Campus Botucatu, Street Prof. Dr. Antonio Celso Wagner Zanin, 250-District de Rubião Junior, Botucatu 18618-689, SP, Brazil

Agriculture, 2024, vol. 14, issue 9, 1-18

Abstract: Water limits may have a disastrous impact on agricultural productivity, and the current climate change scenario presents additional problems for crops that rely on regular rainfall. Reactive oxygen species, such as hydrogen peroxide (H 2 O 2 ), are a recognized stress-sensing mechanism in plants, and may be investigated as an approach for reducing stress impact via systemic acquired acclimation. Here, we looked at how H 2 O 2 foliar application impacts tomato plants’ photosynthetic activity, antioxidant system, sugar chemical profile, and osmotic adjustment during drought and recovery. The experiment was in randomized blocks, 3 × 2 factorial design, with no, one, or two foliar application of 1 mM H 2 O 2 , on plants that were either continually watered or subjected to drought. The plants were tested both during the drought period and after they had resumed irrigation (recovered). Leaf water potential, chlorophyll a fluorescence, gas exchange, lipid peroxidation, H 2 O 2 concentrations, phenols, proline, antioxidant enzyme activity, and sugar chemical profile were all measured. Our findings showed that H 2 O 2 application generated metabolic alterations in tomato plants independent of water status, and that two applications in drought plants resulted in a 30% decrease in oxidative stress during drought and faster recovery following irrigation return, with greater production of defence-related molecules such as the APX enzyme, phenols, arabinose, and mannose. Continually watered plants also benefited from H 2 O 2 application, which increased carbon assimilation by 35%.

Keywords: hydrogen peroxide; Solanum lycopersicum; sugar profile; trehalose (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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