Article | . 2018 Vol. 36, Issue. 5
Nondestructive Measurement of Paprika (Capsicum annuum L.) Internal Electrical Conductivity and Its Relation to Environmental Factors

Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University1
School of Crop Science and Agricultural Chemistry, Chungbuk National University2
Protected Horticulture Research Institute, National Institute of Horticultural and Herbal Science3

2018.. 691:701


The electrical properties of plants represent physiological activities including water and ion transport in their stems. Therefore, monitoring electrical conductivity in plants (ECp) can be used to detect plant responses to changes in environmental conditions. Stable measurement of internal ECp was developed to evaluate the relationship between the ECp and environmental factors. Two electrodes with three needles were inserted into each side of paprika stems to monitor paprika ECp in response to the environmental factors of temperature, irradiation, and relative humidity. The ECp was positively correlated with irradiation and temperature (R2 = 0.642 and 0.815, respectively), but negatively correlated with relative humidity (R2 = -0.416). The ECp was higher in May than in February due to size differences in the vascular bundle sheaths as well as changes in irradiation and temperature. The ECp was predicted using a regression equation that described environmental data, and the predicted results corresponded well to plant measurements. The ECp was higher during the day than at night, which was attributed to higher daytime water content in the stems.

1. Al Hagrey SA (2006) Electrical resistivity imaging of tree trunks. Near Surf Geophys 4:179-187. doi:10.3997/1873-0604.2005043  

2. Benlloch-González M, Quintero JM, Suárez MP, Sánchez-Lucas R, Fernández-Escobar R, Benlloch M (2016) Effect of moderate high temperature on the vegetative growth and potassium allocation in olive plants. J Plant Physiol 207:22-29. doi:10.1016/j.jplph.2016.10.001  

3. Bieker D, Rust S (2010) Electric resistivity tomography shows radial variation of electrolytes in Quercusrobur. Can J Forest Res 40:1189-1193. doi:10.1139/X10-076  

4. Carvajal M, Martínez, V, Alcaraz CF (1999) Physiological function of water channels as affected by salinity in roots of paprika pepper. Physiol Plant 105:95-101. doi:10.1034/j.1399-3054.1999.105115.x  

5. Dobbertin M (2005) Tree growth as indicator of tree vitality and of tree reaction to environmental stress: a review. Eur J Forest Res 124:319-333. doi:10.1007/s10342-005-0085-3  

6. Fensom DS (1963) The bioelectric potentials of plants and their functional significance. V. Some daily and seasonal changes in the electrical measurements of water potential in avocado and white spruce. Can J Bot 41:831-851. doi:10.1139/b63-068  

7. Fischer RA, Hsiao TC (1968) Stomatal opening in isolated epidermal strips of Vicia faba. II. Responses to KCl concentration and the role of potassium absorption. Plant Physiol 43:1953-1958. doi:10.1104/pp.43.12.1953  

8. Fromm J, Lautner S (2007) Electrical signals and their physiological significance in plants. Plant Cell Environ 30:249-257. doi:10.1111/ j.1365-3040.2006.01614.x  

9. Gardeström P, Igamberdiev AU (2016) The origin of cytosolic ATP in photosynthetic cells. Physiol Plant 157:367-379. doi:10.1111/ppl.12455  

10. Gibert D, Le Mouël, JL, Lambs L, Nicollin F, Perrier F (2006) Sap flow and daily electric potential variations in a tree trunk. Plant Sci 171:572-584. doi:10.1016/j.plantsci.2006.06.012  

11. Gora EG, Bitzer PM, Burchfield JM, Schnitzer SA, Yanoviak SP (2017) Effects of lightning on trees: A predictive model based on in situ electrical resistivity. Ecol Evol 7:8523-8534. doi:10.1002/ece3.3347  

12. Gora EM, Yanoviak SP (2015) Electrical properties of temperate forest trees: a review and quantitative comparison with vines. Can J Forest Res 45:236-245. doi:10.1139/cjfr-2014-0380  

13. Jeon E, Choi S, Yeo KH, Park KS, Rathod ML, Lee J (2017) Development of electrical conductivity measurement technology for key plant physiological information using microneedle sensor. J Micromech Microeng 27:085009. doi:10.1088/1361-6439/aa7362  

14. Jung DH, Kim D, Yoon HI, Moon TW, Park KS, Son JE (2016) Modeling the canopy photosynthetic rate of romaine lettuce (Lactuca sativa L.) grown in a plant factory at varying CO concentrations and growth stages. Hortic Environ Biotechnol 57:487-492. doi:10.1007/ s13580-016-0103-z  

15. Koppán A, Fenyvesi A, Szarka L, Wesztergom V (2002) Measurement of electric potential difference on trees. Acta Biol Szeged 46:37-38  

16. Koppán A, Szarka L, Wesztergom V (1999) Temporal variation of electrical signal recorded in a standing tree. Acta Geod Geophys Hu 34:169-180  

17. Koppán A, Szarka L, Wesztergom V (2000) Annual fluctuation in amplitudes of daily variations of electrical signals measured in the trunk of a standing tree. Compt Rendus Acad Sci III - Sci Vie 323:559-563. doi:10.1016/S0764-4469(00)00179-7  

18. Lekas TM, MacDougall RG, MacLean DA, Thompson RG (1990) Seasonal trends and effects of temperature and rainfall on stem electrical capacitance of spruce and fir trees. Can J Forest Res 20:970-977. doi:10.1139/x90-130  

19. Love CJ, Zhang S, Mershin A (2008) Source of sustained voltage difference between the xylem of a potted Ficus benjamina tree and its soil. PLoS ONE, 3:e2963, 1-4. doi:10.1371/journal.pone.0002963  

20. Mancuso S (2000) Electrical resistance changes during exposure to low temperature measure chilling and freezing tolerance in olive tree (Olea europaea L.) plants. Plant Cell Environ 23:291-299. doi:10.1046/j.1365-3040.2000.00540.x  

21. Moon TW, Jung DH, Chang SH, Son JE (2018) Estimation of greenhouse CO concentration via an artificial neural network that uses environmental factors. Hortic Environ Biotechnol 59:45-50. doi:10.1007/s13580-018-0015-1  

22. Morat P, Le Le Mouël, J-L, Granier A (1994) Electrical potential on a tree. A measurement of the sap flow? Compt Rendus Acad Sci II 317:98-101  

23. Navarro JM, Garrido C, Martínez V, Carvajal M (2003) Water relations and xylem transport of nutrients in pepper plants grown under two different salts stress regimes. Plant Growth Regul 41:237-245. doi:10.1023/B:GROW.0000007515.72795.c5  

24. 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 24:491-503. doi:10.1046/j.1365-3040.2001.00704.x  

25. Piene H, Thompson RG, McIsaac JE, Fensom DS (1984) Electrical resistance measurements of young balsam fir trees in relation to specific volume increment, foliar biomass, and ion content of bark and wood. Can J Forest Res 14:177-180. doi:10.1139/x84-034  

26. Shigo AL, Shigo A (1974) Detection of discoloration and decay in living trees and utility poles. USDA Forest Service, Northeastern Forest Experiment Station, Upper Darby, Pennsylvania, Research Paper, NE-294  

27. Shortle WS, Shigo AL, Berry P, Abusamra J (1977) Electrical resistance in tree cambium zone: relationship to rates of growth and wound closure.Forest Sci 23:326-329  

28. Smith DM, Allen SJ (1996) Measurement of sap flow in plant stems. J Exp Bot 47:1833-1844. doi:10.1093/jxb/47.12.1833  

29. Smith KT, Ostrofsky WD (1993) Cambial and internal resistance of red spruce trees in eight diverse stands in the northeastern United States. Can J Forest Res 23:322-326. doi:10.1139/x93-044  

30. Stone GE, Chapman GH (1912) Electrical resistance of trees. 24th Annual Report Massachusetts Agricultural Experiment Station 31:144-176  

31. Tattar TA, Shigo AL, Chase T (1972) Relationship between degree of resistance to a pulsed electric current and wood in progressive stages of discoloration and decay in living trees. Can J Forest Res 2:236-243. doi:10.1139/x72-039