scholarly journals Physiological indices and phytomass partition in precocious dwarf cashew clones irrigated with saline waters

2020 ◽  
Vol 11 ◽  
pp. e3196
Author(s):  
Geovani Soares de Lima ◽  
Jailson Batista da Silva ◽  
Lauriane Almeida dos Anjos Soares ◽  
Hans Raj Gheyi ◽  
Reginaldo Gomes Nobre ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Salt Stress ◽  
Leaf Area ◽  
Water Salinity ◽  
Stress Indicators ◽  
Relative Growth ◽  
Physiological Indicators ◽  
Shoot Ratio ◽  
Physiological Indices ◽  
Root Shoot Ratio

This research aimed to evaluate the physiological indices and the accumulation of phytomass in clones of precocious dwarf cashew under salt stress during rootstock formation. The experiment was conducted in greenhouse in the municipality of Pombal-PB. The experimental design was in randomized blocks, and the treatments were organized in a 5 x 3 factorial arrangement, constituting the levels of electrical conductivity of the irrigation water - ECw (0.4 -Control; 1.2; 2.0; 2.8, and 3.6 dS m-1) and the clones of precocious dwarf cashew (Faga 11, Embrapa 51, CCP 76), with three replications and two plants per plot. Water salinity higher than 0.4 dS m-1 resulted in a decrease of the relative growth in plant height, leaf area, and phytomass accumulation in the cashew plant. The cashew clones are sensitive to water salinity from 0.4 dS m-1. Among the physiological indicators, the leaf area ratio, the sclerophylly index, and the root/shoot ratio of the precocious dwarf cashew are highlighted as salt stress indicators. The use of water with 0.4 dS m-1 of electrical conductivity is recommended for the formation of cashew rootstocks.

scholarly journals Phytomass and quality of yellow passion fruit seedlings under salt stress and silicon fertilization

2020 ◽  
Vol 11 ◽  
pp. e3400
Author(s):  
Genilson Lima Diniz ◽  
Reginaldo Gomes Nobre ◽  
Geovani Soares de Lima ◽  
Leandro de Pádua Souza ◽  
Lauriane Almeida dos Anjos Soares ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Salt Stress ◽  
Block Design ◽  
Passion Fruit ◽  
Northeastern Brazil ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Silicon Fertilization ◽  
Plant Nursery

The semiarid region of Northeastern Brazil is characterized by long drought periods, and the use of saline waters appears as an alternative for the expansion of irrigated areas. Associated with the use of these waters, silicon fertilization constitutes an important attenuator of salt stress. In this perspective, this study aimed to evaluate the phytomass production and quality of the passion fruit cultivar ‘Gigante Amarelo’ grown with saline water and silicon fertilization. The experiment was conducted in a plant nursery belonging to the Center of Agrifood Science and Technology, in the municipality of Pombal-PB. A completely randomized block design in a 5 x 5 factorial scheme was used, referring to five levels of electrical conductivity of the irrigation water (0.3, 1.0, 1.7, 2.4, and 3.1 dS m-1) and five doses of silicon fertilization (0; 25; 50; 75, and 100 g of potassium silicate/plant), with four replications and two plants per plot. The phytomass accumulation (leaves, stem, and roots), as well as the total dry phytomass, shoot dry phytomass, root/shoot ratio, and the quality index of Dickson were evaluated. The data obtained were subjected to the F-test at 0.01 and 0.05 level of probability. The electrical conductivity of water from 0.3 dS m-1 caused the decrease of phytomass production in seedlings of the passion fruit cultivar ‘Gigante Amarelo’, although it is possible to produce good quality passion fruit seedlings with water salinity up to 3.1 dS m-1. The doses of silicon fertilization mitigated the effect of salt stress on the root/shoot ratio of plants of the passion fruit cultivar ‘Gigante Amarelo’.

Acclimation to a Change in Light Regime in Seedlings of Six Australian Rainforest Tree Species

1991 ◽  
Vol 39 (6) ◽  
pp. 591 ◽  
Author(s):  
OO Osunkoya ◽  
JE Ash
Keyword(s):  
Light Availability ◽  
Area Ratio ◽  
Light Regime ◽  
Light Environment ◽  
Specific Leaf Weight ◽  
Relative Growth ◽  
Light Regimes ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Acclimation Potential

Acclimation potential of seedlings of six non-pioneer, North Queensland rainforest tree species (Diploglottis diphyllostegia, Flindersia brayleyana, Dysoxylum schgneri, Prunus turnerana, Neisosperma poweri and Castanospora alphandii) were evaluated in three different light regimes. The seedlings were grown from seeds and raised in 37, 10 and 2.5% photosynthetically active radiation (PAR) of full sunlight in a shade house. Plants were harvested at 1, 4, and 15 months after germination. At 4 months, for each species, one-third of the seedlings in each light environment were transferred to each of the two other light environments. The remaining one-third stayed in the same light environment and formed the control. The control seedlings of all species showed a marked response to increasing PAR: relative growth rate (RGR) and total biomass were low in the 2.5% PAR level, increased in the 10% PAR level and were maximal in the 37% PAR level, except for Neisosperma. The seedlings in the 25% PAR level showed a typical shade plant morphology with a high leaf area ratio, low root-shoot ratio and low specific leaf weight. For seedlings of Dysoxylum and Prunus, a change in light regime from 37% PAR to 2.5% PAR resulted in negative relative growth rates. Eleven months after transfer, many growth characteristics still showed significant initial × final light environment interactions, an indication of incomplete adjustment. Acclimation to increasing light availability was faster than acclimation to decreasing light availability. On the basis of biomass allocation patterns (root-shoot ratio, leaf area ratio and specific leaf weight), the six species could not be differentiated under the three light regimes and their dynamics. However, using RGR as a relative measure of carbon economy, it was possible to differentiate the species in their acclimation ability to decreased but not to increased irradiance. It was concluded that, for non-pioneer species, acclimation potential may be more related to physiological than to morphological plasticity.

Greenhouse production of Echinacea purpurea (L.) and E. angustifolia using different growing media, NO3−/NH4+ ratios and watering regimes

2006 ◽  
Vol 86 (3) ◽  
pp. 809-815 ◽  
Author(s):  
Youbin Zheng ◽  
Mike Dixon ◽  
Praveen Saxena
Keyword(s):  
Water Stress ◽  
Medicinal Plant ◽  
Leaf Area ◽  
Production System ◽  
Echinacea Purpurea ◽  
Root Production ◽  
Total Biomass ◽  
Greenhouse Production ◽  
Shoot Ratio ◽  
Root Shoot Ratio

Current field cultivation and wild-harvest methods for the medicinal plant Echinacea are struggling to meet the requirements for a high-quality, uniformly produced crop for human consumption. To help meet this challenge, the potential of using a greenhouse production system for Echinacea production was explored. Echinacea purpurea (L.) Moench and angustifolia DC. var. angustifolia plants were grown in three types of greenhouse production systems: (1) deep flow solution culture (D), (2) pots with either Pro-Mix (P) or (3) sand (S). Plants were irrigated with one of three nutrient solutions containing NO3−/NH4+ ratios of 7:1, 5:1 or 3:1, respectively. The plants grown in the Pro-Mix and the sand systems were either well-watered or subjected to periodical water stress. The results obtained after 12 wk of growth showed that Echinacea root production in the greenhouse systems was comparable with or better than that in the field. Based on root and total biomass production, the Pro-Mix system was the best production system for both E. angustifolia and E. purpurea. In most cases, the NO3−/NH4+ ratio did not have significant effects on the growth of either species. When effects were seen, however, higher NO3−/NH4+ levels generally resulted in greater leaf area, root and total biomass, and a higher root/shoot ratio. Mild periodic water stress did not affect the root/shoot ratio or the root biomass in either species. The application of a periodic water stress reduced leaf area of both species, but a reduction in total biomass was only observed in E. purpurea. Key words: Echinacea, greenhouse production, hydroponic production, medicinal plant, NO3−/NH4+ ratio, water stress

scholarly journals Utilização de macrófitas aquáticas em substrato para a produção de mudas de moringa

2016 ◽  
Vol 36 (85) ◽  
pp. 25 ◽  
Author(s):  
Walda Monteiro Farias ◽  
Leonaldo Alves de Andrade ◽  
Manoel Bandeira de Albuquerque ◽  
João Rodrigues da Cunha
Keyword(s):  
Water Hyacinth ◽  
Dry Matter ◽  
Aquatic Macrophytes ◽  
Moringa Oleifera ◽  
Water Lettuce ◽  
Relative Growth ◽  
Substrate Composition ◽  
Crown Diameter ◽  
Shoot Ratio ◽  
Root Shoot Ratio

A utilização de macrófitas aquáticas na composição de substratos para produção de mudas de moringa constitui uma alternativa sustentável. Portanto, objetivou-se com esta pesquisa avaliar o desenvolvimento de mudas de moringa, utilizando subtratos com macrófitas aquáticas, e determinar os teores de N, P e K nas mudas. Utilizaram-se diferentes combinações de macrófitas (M), esterco bovino (E) e terra vegetal (TV) para compor os subtratos. O experimento foi conduzido em esquema fatorial 3 × 4, em delineamento em blocos casualizados com quatro repetições. Foram avaliados: alturas das plantas, diâmetro da copa e caule, taxa relativa de crescimento em altura, em diâmetro da copa e do caule, matéria seca da parte aérea e raízes, comprimento de raízes e razão raízes/parte aérea, além dos teores de N, P e K das mudas. As mudas de moringa apresentam crescimento reduzido quando produzidas em substratos constituídos unicamente com taboa. Alface d’água e os substratos compostos por 60% M + 30% E + 10% TV e 70% M + 30% E, proporcionaram melhor nutrição e crescimento das mudas de moringa. O substrato 60M+30E+10TV composto pelo aguapé e taboa promoveram maior aporte de P para as mudas de moringa.Use of aquatic macrophytes in substrate composition to produce moringa The use of aquatic macrophytes in substrate composition to produce seedlings of moringa is a sustainable alternative. Therefore, the objective of this research was to evaluate the development of moringa seedlings using substrates composed with aquatic macrophytes, and to determine concentrations of N, P and K in the seedlings. We used different combinations of weeds (M), manure (E) and topsoil (TV) to compose the substrates. The experiment was conducted in a 3 × 4 factorial in randomized arrangement with four replications. We evaluated plant height, crown diameter and stem, relative growth rate in height, canopy diameter and in stem, dry matter of aerial part and of roots, root length and root/shoot ratio, besides the content of N, P and K in seedlings. Moringa seedlings showed reduced growth when produced in substrates composed only with cattail. Water lettuce and substrates composed of 60% M + 30%E + 10 % TV and 70% M + 30% E, promoted greater nutrition and growth of moringa seedlings. The substrate 60M +30E +10TV composed by water hyacinth and cattail resulted in greater amount of P in moringa seedlings.Index terms: Organic compound;Typha domingensis;Moringa oleifera

scholarly journals Influence of Day and Night Temperatures on Sweet Pepper Seedling Development

1996 ◽  
Vol 121 (4) ◽  
pp. 699-704 ◽  
Author(s):  
Yaping Si ◽  
Royal D. Heins
Keyword(s):  
Leaf Area ◽  
Dry Weight ◽  
Sweet Pepper ◽  
Internode Length ◽  
Stem Diameter ◽  
Stem Length ◽  
Shoot Dry Weight ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
The Difference

Sweet pepper (Capsicum annuum `Resistant Giant no. 4') seedlings were grown for 6 weeks in 128-cell plug trays under 16 day/night temperature (DT/NT) regimes from 14 to 26 °C. Seedling stem length, internode length, stem diameter, leaf area, internode and leaf count, plant volume, shoot dry weight (DW), seedling index, and leaf unfolding rate (LUR) were primarily functions of average daily temperature (ADT); i.e., DT and NT had similar effects on each growth or development parameter. Compared to ADT, the difference (DIF, where DIF = DT - NT) between DT and NT had a smaller but still statistically significant effect on stem and internode length, leaf area, plant volume, stem diameter, and seedling index. DIF had no effect on internode and leaf count, shoot DW, and LUR. The root: shoot ratio and leaf reflectance were affected by DT and DIF. Positive DIF (DT higher than NT) caused darker-green leaf color than negative DIF. The node at which the first flower initiated was related to NT. The number of nodes to the first flower on pepper plugs grown at 26 C NT was 1.2 fewer than those of plants grown at 14 °C NT.

scholarly journals Root Applications of Gibberellic Acid Enhance Growth of Seven Pelargonium Cultivars

HortScience ◽  
1991 ◽  
Vol 26 (5) ◽  
pp. 555-556 ◽  
Author(s):  
Richard N. Arteca ◽  
Carl D. Schlagnhaufer ◽  
Jeannette M. Arteca
Keyword(s):  
Growth Rate ◽  
Gibberellic Acid ◽  
Root Systems ◽  
Relative Growth ◽  
Unit Leaf ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Wide Range ◽  
Percent Moisture ◽  
Hydroponically Grown

Four concentrations of GA, (0.05, 0.5, 5.0, or 50 mg·liter–1) were applied to the root systems of seven hydroponically grown geranium (Pelargonium × hortorum cv. Empress Irene, Glacier Crimson, Sincerity, Pink Fiat, Sybil Holmes, and Mrs. Parker and P. × domesticum cv. Lavender Grand Slam) cultivars. The relative growth rate of all cultivars tested increased with GA3 treatments. In conjunction with the increase in growth rate, each of the cultivars showed a reduction in the root: shoot ratio and chlorophyll content per unit leaf area with no change in the percent moisture. These Pelargonium cultivars are genetically diverse, showing that GA3 can stimulate growth over a wide range of cultivars. Chemical name used: gibberellic acid (GA3).

scholarly journals Induction of tolerance to salt stress in soursop seedlings using hydrogen peroxide

2019 ◽  
Vol 10 (4) ◽  
pp. 484-490 ◽  
Author(s):  
André Alisson Rodrigues Da Silva ◽  
Geovani Soares De Lima ◽  
Carlos Alberto Vieira de Azevedo ◽  
Luana Lucas De Sá Almeida Veloso ◽  
Jessica Dayanne Capitulino ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrogen Peroxide ◽  
Antioxidant Enzymes ◽  
Salt Stress ◽  
Salt Tolerance ◽  
Gas Exchange ◽  
Irrigation Water ◽  
Water Salinity ◽  
Exogenous Application ◽  
Induction Of Tolerance

The exogenous use of hydrogen peroxide is an alternative in the acclimatization of plants to salt stress due to the greater activity of antioxidant enzymes. In this perspective, this study aimed to evaluate the gas exchange and the growth of soursop seedlings under salt stress using hydrogen peroxide. The study was conducted under greenhouse conditions. The treatments were distributed in randomized blocks, in a 5 x 2 factorial arrangement, related to five levels of electrical conductivity of the irrigation water - 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. The effects of the treatments were evaluated by the variables of gas exchange and growth. The increase in water salinity negatively affected the gas exchange and the growth of the soursop seedlings. The gas exchange and growth variables presented deleterious effects caused by the salinity of the irrigation water, mitigated by the exogenous application of hydrogen peroxide at the concentration of 20 μM. The exogenous use of hydrogen peroxide at the concentration of 20 μM can be used to induce salt tolerance in soursop seedlings.

scholarly journals GROWTH AND FOLIAR CONTENTS OF Na+ AND Cl- IN GENOTYPES OF FORAGE SORGHUM IRRIGATED WITH SALINIZED WATERS

Irriga ◽  
2018 ◽  
Vol 23 (1) ◽  
pp. 108-120 ◽  
Author(s):  
Daniela Siqueira Coelho ◽  
Welson Lima Simões ◽  
Alessandra Monteiro Salviano ◽  
Moisés Alves de Souza ◽  
Jair Andrade Lima ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Salt Stress ◽  
Sorghum Bicolor ◽  
Leaf Area ◽  
Growth And Yield ◽  
Forage Sorghum ◽  
Sorghum Genotypes ◽  
Foliar Concentration ◽  
E Mail ◽  
Sorghum Bicolor L

GROWTH AND FOLIAR CONTENTS OF Na+ AND Cl- IN GENOTYPES OF FORAGE SORGHUM IRRIGATED WITH SALINIZED WATERS  DANIELA SIQUEIRA COELHO1; WELSON LIMA SIMÕES2; ALESSANDRA MONTEIRO SALVIANO3; MOISÉS ALVES DE SOUZA4; JAIR ANDRADE LIMA5 E JOSÉ EZEQUIEL DE SANTOS6 1 Instituto do Meio Ambiente e Recursos Hídricos, rua A, s/n, 48906-652, Juazeiro - BA, e-mail: [email protected] Embrapa Semiárido, rodovia BR-428, Km 152, s/n, Zona Rural, 56302-970, Petrolina - PE, e-mail: [email protected] Embrapa Semiárido, rodovia BR-428, Km 152, s/n, Zona Rural, 56302-970, Petrolina - PE, e-mail: [email protected] Departamento de Biologia – Fisiologia Vegetal, Universidade Federal de Lavras, Câmpus Universitário, Caixa Postal 3037,  37200-000, Lavras - MG, e-mail: [email protected] Embrapa Semiárido, rodovia BR-428, Km 152, s/n, Zona Rural, 56302-970, Petrolina - PE, e-mail:  [email protected] Departamento de Biologia, Universidade de Pernambuco, rodovia BR 203, Km 2, s/n, 56328-903, Petrolina - PE,e-mail: [email protected]  1 ABSTRACT Plant efficiency in developing specific mechanisms to survive under salt stress can vary significantly among genotypes, which implies different responses in growth and yield. The aim of this study was to evaluate the salt tolerance of forage sorghum genotypes by analysis of growth variables correlated with the levels of Na+ and Cl- accumulated in the leaves. The research was carried out in a greenhouse belonging to the Brazilian Agricultural Research Corporation (EMBRAPA) – Semiarid, in Petrolina, Pernambuco state, Brazil. The treatments were arranged in a randomized block design with factorial arrangement 10x6 with ten genotypes (‘F305’, ‘BRS 655’, ‘BRS 610’, ‘Volumax’, ‘1,015,045’, ‘1,016,005’, ‘1,016,009’, ‘1,016,013’, ‘1,016,015’ and ‘1,016. 031’), salt solutions with six levels of electrical conductivity (0, 2.5, 5.0, 7.5, 10 and 12.5 dS m-1) and three replications. The variables evaluated were dry mass and water content of the shoots and roots, plant height, stern diameter, leaf area and foliar concentration of Na+ and Cl-. It was found that the growth of forage sorghum genotypes is similarly affected due to the increase of Na+ and Cl- foliar contents. The growth of forage sorghum is reduced by 50% when the plants are submitted to the application of saline solution with electrical conductivity of 8 dS m-1. Keywords: leaf area, salt stress, dry matter, Sorghum bicolor (L.) Moench.  COELHO, D. S.; SIMÕES, W. L.; SALVIANO, A. M.; SOUZA, M. A. de; LIMA, J. A.; SANTOS, J. E. deCRESCIMENTO E TEORES FOLIARES DE Na+ E Cl- EM GENÓTIPOS DE SORGO FORRAGEIRO IRRIGADOS COM ÁGUAS SALINIZADAS   2 RESUMO A eficiência das plantas em desenvolver mecanismos específicos para sobreviver ao estresse salino pode variar significativamente entre genótipos, implicando em respostas diferenciadas no seu crescimento e rendimento. O objetivo do presente estudo foi avaliar o crescimento e teores foliares de Na+ e Cl- em dez genótipos de sorgo forrageiro submetidos a irrigações com águas salinizadas. O experimento foi conduzido em casa de vegetação localizada na sede da Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) – Semiárido, em Petrolina – PE. Utilizou-se o delineamento experimental em blocos casualizados dispostos em esquema fatorial 10x6, considerando dez genótipos (‘F305’, ‘BRS 655’, ‘BRS 610’, ‘Volumax’, ‘1.015.045’, ‘1.016.005’, ‘1.016.009’, ‘1.016.013’, ‘1.016.015’ e ‘1.016.031’), soluções salinas com seis valores de condutividade elétrica (0; 2,5; 5,0; 7,5; 10 e 12,5 dS m-1) e três repetições.  As variáveis avaliadas foram massa seca e conteúdo de água da parte aérea e raízes, altura da planta, diâmetro do colmo, área foliar e teores foliares de Na+ e Cl-. Verificou-se que o crescimento dos genótipos de sorgo forrageiro foi afetado  similarmente com o aumento da salinidade devido à elevação das concentrações de Na+ e Cl- nas folhas. O crescimento do sorgo forrageiro é reduzido em 50% quando as plantas são submetidas à aplicação de solução salina com condutividade elétrica de 8 dS m-1. Palavras-chave: área foliar, salinidade, massa seca, Sorghum bicolor (L.) Moench. 

scholarly journals Combined effect of green-colored covers and shading on the growth of sisal (Furcraea hexapetala) plants

2017 ◽  
Vol 35 (3) ◽  
pp. 314-322
Author(s):  
Fánor Casierra-Posada ◽  
Fernando Portilla-Fuentes ◽  
Julián Molano-Díaz
Keyword(s):  
Leaf Area ◽  
Dry Mass ◽  
Infrared Light ◽  
Relative Growth ◽  
Light Reduction ◽  
Plant Morphogenesis ◽  
Shoot Ratio ◽  
Content Index ◽  
Use Efficiency

Plants have the ability to respond in different ways to the quality of light, its intensity, and the combination of both. In addition, chlorophyll absorbs light in the blue and red bands of the spectrum, but green and infrared light are poorly absorbed or not absorbed, yet they affect plant morphogenesis. An experiment was carried out in Tunja, Colombia, in which the influence of shading on sisal plants (Furcraea hexapetala) was evaluated. The plants were placed under green polypropylene filters that induced 55.4, 85.8 and 90.1% light reduction and were compared with open exposure plants in a greenhouse. As a consequence of shading, the values of the following variables were reduced: chlorophyll content index by between 52.2 and 55.0%, dry mass by between 80.8 and 94.0%, water uptake by between 40.9 and 44.9%, water use efficiency by between 23.0 and 53.7% and relative growth rate by between 35.1 and 58.4%, as compared to the control, while the values for the root to shoot ratio, specific leaf area and leaf area ratio were increased by ranges of 24.2 to 73.5%, 107.5 to 132.4% and 116.6 to 174.9%, respectively. The shading with green filters induced a reduction in the red/far red ratio of light. Based on these results, it was possible to infer that the sisal plants presented low plasticity for tolerating the abiotic stress induced by green-filter shading.

scholarly journals Hydrogen peroxide on acclimation of soursop seedlings under irrigation water salinity

2019 ◽  
Vol 40 (4) ◽  
pp. 1441 ◽  
Author(s):  
André Alisson Rodrigues da Silva ◽  
Geovani Soares de Lima ◽  
Luana Lucas de Sá Almeida Veloso ◽  
Carlos Alberto Vieira de Azevedo ◽  
Hans Raj Gheyi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrogen Peroxide ◽  
Leaf Area ◽  
Salt Concentration ◽  
Irrigation Water ◽  
Sandy Loam ◽  
Water Salinity ◽  
Limiting Factor ◽  
Exogenous Application ◽  
Plastic Bags

The Brazilian Northeast region provides favorable conditions for the exploitation of several crops, but the high salt concentration in irrigation water constitutes a limiting factor for production in most cases. In this context, this study aimed to evaluate the emergence, growth and partition of photoassimilates in soursop seedlings, cv. ‘Morada Nova’, subjected to irrigation with water of increasing salinity levels and to exogenous application of hydrogen peroxide. The study was carried out in plastic bags under greenhouse conditions, using a sandy loam Regolithic Neosol, in the municipality of Campina Grande, PB, Brazil. Treatments were distributed in randomized blocks, in a 5 x 5 factorial arrangement, relative to five levels of irrigation water electrical conductivity - ECw (0.7, 1.4, 2.1, 2.8 and 3.5 dS m-1) and five concentrations of hydrogen peroxide - H2O2 (0, 25, 50, 75 and 100 µM), with four replicates and three plants per plot. Increasing salt concentration compromised all variables analyzed and leaf area was most sensitive. As irrigation water electrical conductivity increased, the deleterious effects of water salinity on the emergence percentage, emergence speed index, stem diameter and leaf area were attenuated by the exogenous application of hydrogen peroxide, with highest efficiency at the concentration of 50 µM. Hydrogen peroxide concentrations above 38 µM inhibited the specific leaf area of soursop, cv. ‘Morada Nova’.

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