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Evaluating plant stress conditions in paprika by comparing internal electrical conductivity, photosynthetic response, and sap flow

Park, Hyun Jun, Park, Jin Hee, Park, Kyoung Sub, Son, Jung Eek
Horticulture, environment and biotechnology 2019 v.60 no.1 pp. 41-48
analytical methods, drought, electrical conductivity, environmental factors, irradiation, paprika, photosynthesis, plant response, plant stress, relative humidity, sap flow, stems, stomatal conductance, temperature, water shortages
A non-destructive analytical method to measure plant internal electrical conductivity (ECₚ) was developed to monitor plant responses to changes in environmental conditions. However, the relationship between ECₚ and plant physiological responses has not yet been established. The objective of the study was to evaluate the relationships among ECₚ, photosynthetic responses, and sap flow in paprika to monitor ECₚ in relation to changes in environmental conditions. High ECₚ levels were related to high photosynthetic rate, stomatal conductance, and transpiration rate. Sap flow in the plant was also associated with ECₚ with a correlation coefficient of 0.606. However, the sap flow reflected only water flux, while ECₚ was determined by both water and ion content in stems of paprika. The ECₚ was predicted using environmental factors including temperature, irradiation, and relative humidity. A comparison of measured and predicted ECₚs could be used to detect unusual cultivation conditions for paprika such as drought and high temperature. Plant responses to water shortage were reflected by lower ECₚ compared to the predicted value.