Gas exchanges and photochemical efficiency of hydroponic bell pepper under salinity and plant density

Cavalcante, Antônio Ramos; Júnior, José Amilton Santos; Furtado, Guilherme de Freitas; Chaves, Lúcia Helena Garófalo

doi:10.1590/1807-1929/agriambi.v23n1p3-8

Cited by 9 publications

(9 citation statements)

References 19 publications

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Section: Resultssupporting

confidence: 58%

“…As a defense mechanism, the plant reduces its transpiration rate when there are excess of salts in the solution, in order to retain a greater amount of water in the leaf, besides reducing the absorption and transport of Na + and Clions to its tissues, thus mitigating the deleterious effects of salinity(Ebrahim et al, 2017). Similar results were observed byCavalcante et al (2019) when studying gas exchange in bell pepper plants subjected to increasing electrical conductivity of the nutrient solution in hydroponic system, which reduced E on average by 67% between the lowest and highest ECns.The excess of ions in the brackish solution significantly reduced stomatal conductance (gs) in all cultivars at 15 DAT (Figure2A), and the cultivars Samambaia, Tomate Vermelho and Caroline showed a decrease in gs from ECns values of 4.8, 4.5 and 2.4 dS m -1 , respectively, reaching maximum gs of 0.288, 0.265 and 0.255 mol m -2 s -1 , which hence demonstrates that the cv. Samambaia obtained higher gs with higher ECns (4.8 dS m -1 ), thus being the most adapted to ECns.…”

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confidence: 65%

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Physiology and production of cherry tomato cultivars in a hydroponic system using brackish water

Batista

Nascimento

Júnior

et al. 2021

Rev. bras. eng. agríc. ambient.

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Agricultural production has become a challenge in arid and semi-arid regions due to the scarcity of water for irrigation, so brackish water is commonly used. The present study aimed to evaluate the physiological and production responses of cherry tomato cultivars under salinity levels of the nutrient solution in a hydroponic system. The experiment was conducted in a split plot and 5 × 3 factorial scheme with four repetitions. The factors corresponded to different values of electrical conductivity of the nutrient solution (ECns 2.5, 4.0, 5.5, 7.0 and 8.5 dS m-1) and cultivars (Samambaia, Tomate Vermelho and Caroline). The increase in nutrient solution salinity negatively affected the gas exchange, electrolyte leakage and photosynthetic pigments of the cherry tomato cultivars, mainly with the prolongation of stress. The photosynthetic system was efficient up to 4.0 dS m-1, but, above this electrical conductivity in the nutrient solution, there was photoinhibition or photodamage in the cherry tomato plants at 30 days after transplanting. The cherry tomato cultivars Samambaia and Caroline were the most adapted to brackish solutions, while Tomate Vermelho was the most susceptible.

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Section: Resultssupporting

confidence: 58%

supporting

confidence: 65%

Physiology and production of cherry tomato cultivars in a hydroponic system using brackish water

Batista

Nascimento

Júnior

et al. 2021

Rev. bras. eng. agríc. ambient.

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“…The deleterious effect of salinity on the photosynthetic apparatus is common in Solanaceae plants. For instance, in bell pepper (C. annuum L.) plants, F 0 , F v and F m reduced significantly above the estimated ECw level of 3.98 dS m -1 (Cavalcante et al, 2019). Such response was also observed in tomato (S. lycopersicum L.) plants under increased salinity of irrigation water (Tatagiba et al, 2014).…”

Section: /7mentioning

confidence: 77%

“…Such conditions severely affect the development of crops in the region (Almeida et al, 2019). The high salt content in water and soil causes salt stress in plants which may disturb growth and development, by mainly affecting the photosynthetic apparatus (Cavalcante et al, 2019), resulting in biomass production losses.…”

Section: Introductionmentioning

confidence: 99%

Photochemical efficiency, biomass and chlorophyll of phyális under salinity and biostimulant

Nóbrega

Fátima

Ferreira

et al. 2021

Agraria

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Physalis peruviana L. has great exploitation potential especially for small producers in the Brazilian Northeast. However, production in semiarid regions may be limited by high salt content in soils and water sources used for irrigation. Thus, this study evaluated the application of Ascophyllum nodosum seaweed extract as saline stress attenuator in P. peruviana L. The randomized block design was used, in an incomplete 5 × 5 factorial scheme, with five of electrical conductivities of the irrigation water (0.50, 1.23, 3.00, 4.77 and 5.50 dS m -1 ) and five increasing concentrations of kelp extract (0.00, 1.45, 5.00, 8.55 and 10.00 mL L -1 ), with nine combinations generated by the Central Box matrix, with four replicates of four plants to evaluate the effect on phytomass accumulation, chlorophyll fluorescence and pigment content. Results showed, salinity significantly reduced biomass production and chlorophyll fluorescence and pigment indices. However, when plants were treated with 9.9 mL L -1 seaweed extract they increased biomass production and seedling quality. On the other hand, up to 4.1 mL L -1 , the biostimulant increased dark-adapted fluorescence indices which indicate it reduces damages to the photosynthetic apparatus caused by salt-stress and thus improving photosynthetic activity and photoassimilates production. Thus the application of A. nodosum seaweed extract attenuates the deleterious effect of salt stress in photosynthesis and thus in biomass production of P. peruviana plants.

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“…Gas exchanges are very important to maintain plant vital processes, such as nutrients transport, the production of photoassimilates, cell expansion, cooling and plant cell water regulation. For these events to happen, the characteristics of the soil must provide good conditions for the plants (Cavalcante et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Gas exchanges and chlorophyll content in green pepper plants under bio-fertilization and times of application

et al. 2021

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This study aimed to determine the gas exchange and the chlorophyll content of green pepper plants under doses and times of application of bio-fertilizers based on manure and enriched organic compost. Two experiments were carried out simultaneously with applications of bio-fertilizers prepared from manure and enriched organic compost, one using cattle manure (CBF) and the other sheep manure (SBF). For these, four doses of biological fertilizers (100, 200, 300 and 400 dm³ ha-1), three application times (0, 30 and 60 days after transplantation - DAT) and absolute control, referring to the absence of fertilization, were used. treatments. were arranged in a randomized block design, totaling 13 treatments. The variables evaluated were: the relative chlorophyll a, b and total content; liquid photosynthesis (A); stomatal conductance (gs); internal CO2 concentration (Ci); instant carboxylation efficiency (iCE - A/Ci); transpiration rate (T); intrinsic water use efficiency (iWUE - A/gs); and water use efficiency (WUE - A/E). Gs, A and T, showed significant effect at 60 DAT with the application of SBF and Ci at 30 DAT with CBF. The dose of 400 dm³ ha-1 of SBF provided greater gas results, and the doses of 200 and 300 dm³ ha-1 of CBF promoted a greater Ci, greater stomatal conductance, greater liquid photosynthesis and better water use efficiency, which results in a greater plant fresh weight at the time of flowering induction.

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Gas exchanges and photochemical efficiency of hydroponic bell pepper under salinity and plant density

Cited by 9 publications

References 19 publications

Physiology and production of cherry tomato cultivars in a hydroponic system using brackish water

Physiology and production of cherry tomato cultivars in a hydroponic system using brackish water

Photochemical efficiency, biomass and chlorophyll of phyális under salinity and biostimulant

Gas exchanges and chlorophyll content in green pepper plants under bio-fertilization and times of application

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