Evaluating plant stress conditions in paprika by comparing internal electrical conductivity, photosynthetic response, and sap flow
- 60 Downloads
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.
KeywordsPlant response Stomatal conductance Transpiration rate Water stress
This research was supported by Korea Institute of Planning and Evaluation for Technology of Food, Agriculture and Forestry (iPET) (115104033SB010).
- Kalaji HM, Jajoo A, Oukarroum A, Brestic M, Zivcak M, Samborska IA, Cetner MD, Łukasik I, Goltsev V et al (2016) Chlorophyll a fluorescence as a tool to monitor physiological status of plants under abiotic stress conditions. Acta Physiol Plant 38:102. https://doi.org/10.1007/s11738-016-2113-y CrossRefGoogle Scholar
- Koppán A, Fenyvesi A, Szarka L, Wesztergom V (2002) Measurement of electric potential difference on trees. Act Biol Szeg 46:37–38Google Scholar
- Park HJ, Park JH, Park JS, Son JE (2018) Nondestructive measurement of paprika (Capsicum annuum L.) internal electrical conductivity and its relation to environmental factors. Hortic Sci Technol 36:691–701Google Scholar
- Peuke AD, Rokitta M, Zimmermann U, Schreiber L, Haase A (2001) Simultaneous measurement of water flow velocity and solute transport in xylem and phloem of adult plants of Ricinus communis over a daily time course by nuclear magnetic resonance spectrometry. Plant Cell Environ 24:491–503CrossRefGoogle Scholar
- Steinberg S, van Bavel CH, McFarland MJ (1989) A gauge to measure mass flow rate of sap in stems and trunks of woody plants. J Am Soc Hortic Sci 114:466–472Google Scholar