Photochemical efficiency of cashew rootstocks under salt stress and foliar application of potassium silicate

Cashew is a fruit species of great economic importance in Brazil, especially in its Northeast region. However, abiotic factors such as water and soil salinity stand out as limiting parameters for this crop, affecting all phases of development as well as physiological and biochemical processes. In th...

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Bibliographic Details
Published in:Comunicata Scientiae 2022-01, Vol.13, p.1-9
Main Authors: de Fatima, Reynaldo Teodoro, Nobre, Reginaldo Gomes, de Lima, Geovani Soares, Figueiredo, Francisco Romdrio Andrade, Souza, Leandro de Padua, Pimento, Thiago Alves
Format: Article
Language:English
Subjects:
Abiotic factors
Abiotic stress
Anacardiaceae
Economic importance
Economics
Efficiency
Electrical conductivity
Electrical resistivity
Experiments
Foliar applications
Irrigation
Irrigation water
Photochemicals
Photochemistry
Photosynthesis
Photosynthetic apparatus
Photosystem II
Physiology
Potassium
Potassium silicates
Rootstocks
Salinity
Salinity effects
Salt
Silicates
Soil salinity
Soil water
Water salinity
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Summary:Cashew is a fruit species of great economic importance in Brazil, especially in its Northeast region. However, abiotic factors such as water and soil salinity stand out as limiting parameters for this crop, affecting all phases of development as well as physiological and biochemical processes. In this scenario, the use of products to mitigate such damage becomes a necessary practice, with silicon and potassium being viable alternatives. From this perspective, the present study aimed to evaluate the photochemical efficiency of cashew rootstocks subjected to water salinity and foliar application of potassium silicate. A randomized block design arranged in a 5x5 factorial with four replications and two plants per plot was used in the experiment. Treatments consisted of different levels of irrigation water electrical conductivity - ECw (0.3, 1, 1.7, 2.4, and 3.1 dS m-1) and potassium silicate concentrations (0, 250, 500, 750, and 1000 mg L-1) supplied via foliar application. Irrigation water salinity levels from 2.1 dS m-1 reduce the photochemical efficiency of photosystem II by at least 10%, consequently affecting the photosynthetic apparatus of cashew plants 70 days after sowing. The potassium silicate concentration of 250 mg L-1 increases the quantum yield of cashew plants under salt stress conditions.
ISSN:2179-9079
2177-5133
DOI:10.14295/CS.v13.3760