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KMID : 0379119880160010001
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Korean Journal of Mycology
1988 Volume.16 No. 1 p.1 ~ p.8
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Original Effects of Ammonium , Nitrite and Calcium Compounds Affecting to Germination and Mycelial Growth of Phytophthora capsici Causing Red Pepper Fruit Rot
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Abstract
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Effect of suppression for zoosporangial germination and mycelial growth of Phytophthora capsici causing red pepper fruit rot, was carried out in vitro test by using NH₄OH and KNO₂ as ammonium/ammonia, nitrite/nitrous acid and CaCl₂ as calcium ion. Results of in vitro teats with NH₄OH, KNO₂ and CaCl₂ ㏖ solutions demonstrated that zoosporangial germination of P. capsici was inhibited about 15 to 50% compared with control, according to NH₃, HNO as nonionized form and Ca^(2+) ions. Ammonia concentration(NH₃) was proportionally increased by high pH level and ㏖ concentration, whereas low pH and high ㏖ concentration showed rather higher concentration of HNO₂.
Ammonia were more toxic at pH 8 than at pH 7 under the same concentration., while nitrous acid(HNO₂) was more toxic than at pH 8. The zoosporangial germination inhibition in the ammonium/ammonia and nitrite/nitrous acid solutions demonstrated that NN₃ and HNO₂ were primarily responsible for the inhibition at lower concentration and more toxic by increasing concentration. Ca^(2+) ions showed that zoosporangial germination was inhibitory by high pH level and increasing ㏖ concentration in comparison with buffer control. pH levels affected to mycelial growth of the fungus, and especially, high pH caused rather retardation of mycelial growth. There was no definite inhibitory response of mycelial growth at various degree concentrations of the toxicant solutions.
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