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KMID : 0903619920330020220
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Journal of the Korean Society for Horticultural Science
1992 Volume.33 No. 2 p.220 ~ p.228
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Ice Nucleation Activity of Plant Epiphytic Bacteria Causing Frost Injury on Crops
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Abstract
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This study has been carried out to confirm ice nucleation activity of some bacteria which may cause frost damages on various crops in Korea.
Two strains of Pseudomonas syringae, 4 strains of Pseudomonas fluorescens and 2 strains of Erwinia herbicola were isolated from various plant surfaces. Freezing temperature of bacterial suspensions (10^8 cells/㎖) of these bacteria was -2.5∼-3.8℃. They had been sprayed onto corn seedlings. The density of ice nucleation-active (INA) Pseudomonas spp. on the leaves of pear and Japanese apricot ranged from 10² to 10³, and from 10⁴ to 10^5 cells/gram of fresh leaf weight, respectively, when they were counted at late frost period. The maximum population of the bacteria appeared during the month of April (blossom period).
Ice nucleation activity of the bacteria changed with fluctuation of temperature and pH of the bacterial suspension, and the changes was reversible. Frost damage of com seedling by INA bacteria was remarkably reduced by application of dilute hydrochloric acid (10^(-2) N HCl) to the seedling.
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KEYWORD
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