ABSTRACT Knowledge about the effect of chemical conditioners on reduction deleterious effects caused by salinity crops is great importance for expansion cultivation vegetable such as zucchini in semi-arid region Northeast. In this context, objective present study was to evaluate foliar application hydrogen peroxide a mitigator salt stress gas exchange, production, and postharvest fruit quality cultivated hydroponic system. The conducted NFT-type (Nutrient Film Technique) system greenhouse,...

Salt-induced redox and ion imbalance may lead to increased oxidative stress impair the plant growth. However, among many reactive oxygen species (ROS) produced under stress, hydrogen peroxide (H2O2) plays a central role in several signal transduction pathways triggering series of physiological mechanisms increase tolerance salt stress. Thus, this study aimed evaluate changes balance inorganic organic solutes induced by seed priming with H2O2 leaves roots sunflower plants grown In study, six...

ABSTRACT Salinity is one of the main limiting factors for crop growth. The metabolic responses to salt stress are variable and depend on species characteristics. This study aimed select sunflower genotypes tolerant evaluate some mechanisms tolerance in two contrasting (salt-tolerant salt-sensitive) genotypes. In first assay, biomass production accumulation Na+ K+ 26 were evaluated. Genotypes AG963, AG967, AG972, BRS321, BRS324, H251, H360 H863 showed lower characterized as salt-sensitive...

The aim of this study was to verify the effects application H2O2 on salt tolerance and oil production in basil cv. `Gennaro de Menta? grown a hydroponic system. Seedlings were subjected 3 levels (0, 1, 1000 ?M) nutrient solution during 2 different exposure periods (24 48 h) NaCl (0 80 mM). plants harvested at preflowering (at 15 days) postflowering 25 days). At days, 1 ?M H2O2/48 h its reapplication increased leaf dry mass compared other treatments. Relative water content decreased while...

Salinity is still one of the main factors that limit growth and production crops. However, currently, hydrogen peroxide (H2O2) priming has become a promising technique to alleviate deleterious effects caused by salt. Therefore, this study aimed test different leaf spraying strategies with H2O2 for acclimation sunflower plants salt stress, identifying physiological biochemical changes involved in process. The experiment was conducted completely randomized design, four replications. Initially,...

Salt stress is abiotic that directly affects the gas exchange and redox metabolism of plants. However, some studies claim combination potassium-phosphorus fertilization may increase salt tolerance in In this context, objective study was to evaluate antioxidant enzyme activity responses combined tissues West Indian cherry during fructification phase, 240 days after application treatments (DAT) second year brackish water irrigation production. The were distributed randomized blocks, a 5 × 4...

Saline water has been used in irrigation due to the limited availability of fresh water, especially arid and semi-arid regions. However, use this type can affect crop growth development. Studies have tested chemical conditioners minimize negative effects salinity on plants. In scenario, present study examined role hydrogen peroxide mitigating salt stress zucchini plants grown a hydroponic system. The was carried out greenhouse Pombal - PB, Brazil. NFT (nutrient film technique) system...

Several studies have shown hydrogen peroxide (H2O2) as a metabolic messenger that increases plant tolerance to various stress conditions. However, little is known about its effect on the mobilization of seed reserves in establishment seedlings. Thus, this study aimed evaluate pretreatment with H2O2 salt-tolerance and during germination seeds sunflower Seeds were pre-imbibed for 24 hr solutions containing: deionized water (control); (1 mM); NaCl (100 mM). Subsequently, distributed germitest...

Salinity commonly affects photosynthesis and crop production worldwide. However, some studies have shown that hydrogen peroxide seed priming can increase the tolerance of plants to salt stress. In this context, study aimed test hypothesis H2O2 improve photosynthetic efficiency in sunflower under The experiment was conducted a completely randomized design, with four replicates. Six treatments were tested: control (deionized water); (100 mM NaCl); 0.1 (36 h) + 100 NaCl; 1 (24 10 (12 NaCl....

The aim of this study was to evaluate the effect salt stress on contents inorganic and organic solutes, pigments essential oil in two basil genotypes cultivated hydroponic system. experiment carried out a greenhouse. Treatments were distributed randomized blocks, 2 × factorial arrangement, corresponding contrasting (‘Toscano folha de alface’ (TFA) ‘Gennaro menta’ (GM)) levels (0 - control 80 mM NaCl), with six replicates. Na+, Cl- K+ accumulation leaves, stem roots did not differ between...

ABSTRACT Brackish waters has been increasingly used in hydroponic systems for the cultivation of vegetables. However, its use can cause significant losses crop production. Therefore, new alternatives to enhance tolerance plants salt stress are being studied, including seed priming with hydrogen peroxide (H2O2). Thus, this study aimed assess H2O2 at different periods exposure enhancing production, water status and pigments concentration crisp lettuce grown under stress. The experiment was...

Esse estudo teve como objetivo avaliar o efeito de diferentes níveis salinos da água irrigação no crescimento inicial minimelancia cv. Sugar Baby através técnicas estatísticas univariada e multivariada. O experimento foi desenvolvido em casa vegetação na Universidade Federal do Recôncavo Bahia, Cruz das Almas, BA. As sementes foram semeadas bandejas plásticas polietileno contendo substrato composto fibra coco húmus proporção 3:1 (v/v). delineamento utilizado inteiramente casualizado com...

ASPECTOS BIOQUÍMICOS E FLUORESCÊNCIA DA CLOROFILA A EM PLANTAS DE MINIMELANCIA HIDROPÔNICA SOB ESTRESSE SALINO* LAÍS MONIQUE GOMES DO Ó1, ALIDE MITSUE WATANABE COVA2, PETTERSON COSTA CONCEIÇÃO SILVA3, HANS RAJ GHEYI4, ANDRÉ DIAS AZEVEDO NETO5, ROGÉRIO FERREIRA RIBAS6 1Doutoranda em Engenharia Agrícola da Universidade Federal do Recôncavo Bahia, Rua Rui Barbosa, s/n, Cruz das Almas, Brasil laisnique@hotmail.com. 2Pós-Doutoranda no Programa de Pós-graduação Brasil, alidewatanabe@yahoo.com.br....

Pasture degradation is an evolutionary process of losing vigor, productivity and capacity natural recovery pastures. It can economically cripple the production forage quality required by animals. This have a physical and/or chemical biological origin. The aim this study was to evaluate effects tillage, liming fertilization on yellow distrofic oxisol from oastal land zone its consequences Brachiaria decumbens root system. experiment located at UFRB experimental area, Cruz das Almas – BA,...

Salinity remarkably inhibits NO3 - uptake but the mechanisms are not well understood. This study was addressed to elucidate role of ionic and osmotic components salinity on influx efflux employing classic kinetics involving a low affinity transport system (LATS) high (HATS). In presence KCl, NaCl, Na2SO4 at 100 mM concentrations, in both LATS HATS, Michaelis constant (Km) similar for three salts maximum rate (Vmax) decreased as follows: KCl > NaCl Na2SO4, compared control indicating...

Salt stress causes several physiological and biochemical disorders impairs plant growth. However, adequate fertilization can improve the nutritional status may reduce significantly harmful effects caused by salt stress. From this perspective, study aimed to evaluate impact of different combinations nitrogen, phosphorus potassium on antioxidant activity accumulation organic inorganic solutes in West Indian cherry leaves, second year production. The experimental design was randomized blocks,...