آلودگی مخلوط ویروس موزائیک هندوانه و ویروس موزاییک پیسک سبز خیار در گیاهان کدوییان
محورهای موضوعی : گیاه پزشکی
زهره مرادی
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بهروز جعفرپور
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کلید واژه: ویروس موزائیک هندوانه, ویروس موزاییک پیسک سبز خیار, آلودگی همزمان, اثر تشدید کننده, CGMMV, WMV, mixed infection, Synergism,
چکیده مقاله :
آلودگی مخلوط ویروس موزائیک هندوانه (WMV) و ویروس موزاییک پیسک سبز خیار (CGMMV) اثر تشدید کننده ای را نشان داد. آلودگی همزمان این دو ویروس در برخی گیاهان کدوییان از جمله هندوانه، خیار و طالبی سبب ایجاد واکنش های شدید بیماری زایی به همراه زردی، پژمردگی آوندی و در نهایت مرگ گیاهان شد. تجمع RNA ویروس CGMMV در آلودگی مخلوط با WMV تا حدی بیشتر از زمان آلودگی این ویروس به تنهایی بود. به علاوه سطح پروتئین پوششی ویروس CGMMV نیز در زمان آلودگی همزمان افزایش یافت. با این حال سطح RNA و پروتئین پوششی ویروس WMV افزایش قابل توجهی در آلودگی مخلوط نسبت به آلودگی انفرادی نشان نداد. آلودگی انفرادی هر یک از ویروسهای WMV و CGMMV سبب ایجاد علایمی از قبیل رگبرگ روشنی، تاولی، موزاییک سیستمیک یا پیسکی روی برگهای بالایی گیاهان کدوییان شد، ولی در زمان آلودگی مخلوط این دو ویروس همین علایم افزایش پیدا کرد و به صورت سینرژیک (تشدید کننده) نمایان گردید. نتایج حاصل از این بررسی نشان می دهد که آلودگی همزمان دو ویروس WMV و CGMMV سبب ایجاد اثرات تشدید کننده می شود که این به نوبه خود می تواند سبب عواقب همه گیر شدن شود.
Mixed infections of cucurbits by Cucumber green mottle mosaic virus (CGMMV) and Watermelon mosaic virus (WMV) exhibit a synergistic interaction. Watermelon, cucumber and cantaloupe co-infected by the WMV and CGMMV displayed synergistic pathological responses, finally in some cases, progressing to vascular wilt and plant death. Accumulation of CGMMV RNAs in a mixed infection with WMV in some cucurbits was higher than infection with CGMMV alone. Moreover, the level of capsid protein from CGMMV increased in mixed infection. However, the level of WMV did not show any significantly increase in doubly versus singly infected plants. Single infections of WMV or CGMMV on the same hosts produced only vein clearing, blistering, systemic mosaic or mottling on the upper leaves and similar symptoms developed after double infection. It is concluded that co-infections with WMV and CGMMV displayed synergistic interaction which could have epidemiological consequence.
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