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Ice-nucleation activity of Pseudomonas Syringae Pv. Syringae in relation to frost injury of wheat [electronic resource].

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Abdel-Gawad, T. I

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Language: English Summary language: Arabic Description: p.127-136Other title:

تكوين البللورات الثلجية بواسطة البكتيريا بسيدوموناس سيرنجي سلاله ممرضة سيربجي وعلاقتها بضرر الصقيع في القمح [Added title page title]

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Egyptian journal of phytopathology, 2002 v. 30 (1) [electronic resource].

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In: Egyptian journal of phytopathology 2002.v.30(1)Summary: Ice-nucleation activity (INA) of four Pseudomonas syringae pv. syringae isolates from wheat (Triticum aestivum L), along with an isolate from basil, was determined by the droplet test at -5oC. The basil isolate showed low pathogenicity to wheat, though the five isolates gave positive (INA) reaction. Wheat seedlings (cvs. Sakha 69 and Giza 146) exposed to frost at. -5°C before inoculation is obviously increased susceptibility to infection. Wheat seedlings inoculated with a bacterial suspension (108 cfu/ml) expressed greater sensitivity to frost compared to checks sprayed with water. The frost damage was observed to be increased as the exposure to freezing was increased, though wounding and misting were among the most important factors. It could be concluded that a direct relationship exists between the inoculum concentration and the sensitivity to frost.

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Ice-nucleation activity (INA) of four Pseudomonas syringae pv. syringae isolates from wheat (Triticum aestivum L), along with an isolate from basil, was determined by the droplet test at -5oC. The basil isolate showed low pathogenicity to wheat, though the five isolates gave positive (INA) reaction. Wheat seedlings (cvs. Sakha 69 and Giza 146) exposed to frost at. -5°C before inoculation is obviously increased susceptibility to infection. Wheat seedlings inoculated with a bacterial suspension (108 cfu/ml) expressed greater sensitivity to frost compared to checks sprayed with water. The frost damage was observed to be increased as the exposure to freezing was increased, though wounding and misting were among the most important factors. It could be concluded that a direct relationship exists between the inoculum concentration and the sensitivity to frost.

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