Protection effect of antagonist Candida sp. to ice nucleation - active bacteria on frost injury of pear blossoms at late frost period
1989
Kim, K.S. | Kim, K.C. | Cho, B.H. (Chonnam National Univ., Kwangju (Korea R.). Coll. of Agriculture)
Epiphytic populations of ice nucleation-active (INA) bacteria on winter buds or blossoms of pear and of Japanese apricot trees growing at Naju Branch Station of Horticultural Experiment Station were estimated around the late frost period. The density of INA bacteria was the highest at the blooming stage in April, in both plants, but that on Japanese apricot was higher about 100-1,000 times than on pear showing 10** (5)-10** (6) colony forming unit/g fresh weight of petal. Besides, the density of INA bacteria on pear blossoms which had been sprayed with INA Pseudomonas syringae 8401 suspension (10** (8) cells/ml) on February 28 was maintained as almost the same level as on Japanese apricot until late April. Pear trees under field conditions and pear trees sprayed with INA P. syringae on February 28 were damaged at -1 - -2deg C at the blooming stage showing 30 and 65 % frost injury, respectively, but both plants which had been sprayed with the antagonist Candida sp. 8501 suspension (10** (8) cells/ml) showed around 30 % frost injury. Antagonist application at the late frost period was the most effective in reducing frost damage when pear blossoms were sprayed two times with the antagonist at closeness to the prearranged date of late frost as possible. Population densities of the antagonist on pear, Japanese apricot, sweet persimmon and Chinese quinse leaves which had been sprayed with the antagonist suspension (10** (8) cells/ml), decreased with increasing time after application, and were about 10** (3) cells/ml in Japanese apricot and about 10** (2) cells/ml in the other plants at 45 days after application, respectively
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