Quantum Yield, Photosynthetic Pigments and Biomass of Miniwatermelon Under Irrigation Strategies and Potassium1

Silva, Saulo Soares da; Lima, Geovani Soares de; Lima, Vera L. A. de; Soares, Lauriane Almeida dos Anjos; Gheyi, Hans Raj; Fernandes, Pedro Dantas

doi:10.1590/1983-21252021v34n318rc

Cited by 11 publications

(3 citation statements)

References 25 publications

(31 reference statements)

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“…The reduction in biomass may be associated with the deleterious effects of salinity on plants, which reduces water absorption capacity and causes immediate interference in CO2 assimilation processes and energy diversion to other processes, such as osmotic adjustment, maintenance of basic metabolic processes and repair of damage caused by salt stress (Silva et al, 2021b). In a study conducted by Souza et al (2017), evaluating the influence of irrigation with different salinity levels (ECw between 0.3 and 3.5 dS m -1 ) on 'Paluma' guava rootstock, the authors also verified a linear reduction in the RDM of plants with the increase in irrigation ECw.…”

Section: Resultsmentioning

confidence: 99%

Gas exchange, growth and quality of guava seedlings under salt stress and salicylic acid

Xavier¹,

Lima²,

Gheyi³

et al. 2022

Rev. ambiente água

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Guava is a popular Brazilian fruit that is widely produced in Northeastern Brazil, a region with water sources that commonly have high concentrations of salts. Thus, searching for techniques that allow the management of these waters is extremely important for the expansion of irrigated agriculture. In this context, salicylic acid is a phytohormone that can contribute to reducing the effects of salt stress on plants. Given the above, this study evaluated the effect of foliar application of salicylic acid at different concentrations in the mitigation of salt stress on gas exchange, growth, and quality of 'Paluma' guava seedlings. The experiment was conducted in a greenhouse, in Campina Grande - PB, Brazil, using a randomized block design in a 5 × 5 factorial arrangement, corresponding to five levels of electrical conductivity of water (0.6, 1.5, 2.4, 3.3, and 4.2 dS m-1) and five concentrations of salicylic acid (0 - Control; 0.8, 1.6, 2.4, and 3.2 mM), with four replicates and two plants per plot. Foliar application of salicylic acid at a concentration of up to 1.4 mM reduced the deleterious effects of salt stress on the instantaneous water use efficiency of 'Paluma' guava seedlings at 180 days after sowing. The concentrations of salicylic acid applied via foliar did not mitigate the harmful effects of irrigation water salinity on the growth and quality of 'Paluma' guava seedlings. Keywords: Abiotic stress, Psidium guajava L., water scarcity.

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Section: Resultsmentioning

confidence: 99%

Gas exchange, growth and quality of guava seedlings under salt stress and salicylic acid

Xavier¹,

Lima²,

Gheyi³

et al. 2022

Rev. ambiente água

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“…It is important to highlight that the intensity of salt stress effects depends on the species, genotype, duration of exposure, fertilization, irrigation management, and development stage [ 12 ], in addition to stress tolerance mechanisms, including the maintenance of ion homeostasis and the osmotic balance and the elimination of reactive oxygen species [ 13 ]. Thus, the use of water with a high concentration of salts in the phenological phase(s) in which the crop expresses tolerance is a promising alternative for reducing the effects of salt stress [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Another strategy capable of mitigating salt stress in plants is potassium fertilization [ 12 , 13 , 14 , 15 ]. Potassium is involved in almost all plant physiological processes that require water.…”

Section: Introductionmentioning

confidence: 99%

NPK Accumulation, Physiology, and Production of Sour Passion Fruit under Salt Stress Irrigated with Brackish Water in the Phenological Stages and K Fertilization

Lima

Silva

Torres

et al. 2023

Plants

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This research aimed to evaluate the effects of salt stress, varying the phenological stages, and K fertilization on NPK concentrations, physiology, and production of Passiflora edulis Sims. The research was carried out at the University Farm of São Domingos, Paraíba, Brazil, using a randomized block design with a 6 × 2 factorial arrangement. Six irrigation strategies were evaluated (use of low electrical conductivity water (0.3 dS m−1) during all stages of development and application of high-salinity water (4.0 dS m−1) in the following stages: vegetative, flowering, fruiting, successively in the vegetative/flowering, and vegetative/fruiting stages) and two potassium levels (207 and 345 g K2O per plant), with four replications and three plants per plot. The leaf concentrations of N, P, and K in the sour passion fruit plants found in the present study were below the optimal levels reported in the literature, regardless of the development stage and the cultivation cycle. The relative water content, stomatal conductance, and photosynthesis were reduced by salt stress in the first cycle. However, in the second cycle, irrigation with 4.0 dS m−1 in the vegetative/flowering stages increased the CO2 assimilation rate. Passion fruit is sensitive to salt stress in the vegetative/flowering stages of the first cycle. In the second cycle, salt stress in the fruiting stage resulted in higher production per plant.

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Irrigation with saline water in the cultivation of mini watermelon under phosphate fertilization

Lima,

Silva,

Soares

et al. 2023

Braz. J. Biol.

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The objective of this study was to evaluate the water status, photosynthetic pigments, and photochemical efficiency of mini watermelon plants under salt stress and phosphate fertilization. The experiment was conducted in pots under greenhouse conditions in Pombal, PB, Brazil. The experimental design used was randomized blocks in a 5 × 4 factorial scheme, with five levels of electrical conductivity of irrigation water - ECw (0.3, 1.3, 2.3, 3.3, and 4.3 dS m-1) and four doses of phosphorus (60, 80, 100, and 120% of the recommendation), with three replicates. The relative water content in the tissues decreased with the increase in ECw levels in all phosphorus doses, with decreases of 7.05, 7.81 and 8.83% per unit increase in ECw, in plants fertilized with 80, 100 and 120% P2O5. On the other hand, ECw levels increased electrolyte leakage, regardless of phosphorus doses of the recommendation. The synthesis of photosynthetic pigments and the quantum efficiency of photosystem II were inhibited by increasing water salinity from 0.3 dS m-1 in plants grown under phosphorus doses above 60% of the recommendation. Water salinity from 0.3 dS m-1 reduced chlorophyll b contents, initial, maximum, and variable fluorescence of mini watermelon plants, with a decrease of 11.86, 4.51, 4.53, and 4.54% per unit increment of ECw, respectively.

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Quantum Yield, Photosynthetic Pigments and Biomass of Miniwatermelon Under Irrigation Strategies and Potassium1

Cited by 11 publications

References 25 publications

Gas exchange, growth and quality of guava seedlings under salt stress and salicylic acid

Gas exchange, growth and quality of guava seedlings under salt stress and salicylic acid

NPK Accumulation, Physiology, and Production of Sour Passion Fruit under Salt Stress Irrigated with Brackish Water in the Phenological Stages and K Fertilization

Irrigation with saline water in the cultivation of mini watermelon under phosphate fertilization

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