Elimination of Plant Pathogenic Bacteria by Solar Ultraviolet Radiation in Hydroponic Systems
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Ankara Üniversitesi
Abstract
Removing plant pathogens with the sun as a free, available, clean, and
sustainable source of energy is interesting. However, there is no data for
disinfecting major plant pathogenic bacteria such as Pseudomonas
syringae and Clavibacter michiganensis subsp. michiganensis by solar
ultraviolet radiation. To obtain the required time for killing these
bacteria at different temperatures, a bacterial suspension of active
growing cells (approximately 107 CFU mL-1
) was prepared and
subjected to heat inside a water bath. The minimum required time for
killing both of the bacteria was achieved 420, 45, and 15 min at 50, 55,
and 60 °C, respectively. To examine the effect of solar ultraviolet
radiation, the bacteria suspensions inside a quartz tube were exposed to
the sun on a horizontal surface at the constant temperature of 50 °C
within the water bath (water depth: 0.1 m). Both of the bacteria were
killed after one hour by receiving 95.481 kJ m-2 ultraviolet and 2.79315
MJ m-2
solar radiation doses. The synergy of heat and solar UV could
considerably reduce the killing time of the bacteria (7 to 1 hours) at
50 °C. The recommended solar UV dose is 95.481 kJ m-2
for this
condition
Description
Keywords
Disinfection, Heat, Renewable energy