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اثر کیتوزان در بیان ژن و فعالیت آنزیم‌های مؤثر در القای مقاومت به بلایت فوزاریومی خوشۀ گندم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد بیماری‌شناسی گیاهی، گیاه‌پزشکی، دانشکدۀ کشاورزی، دانشگاه زابل

2 استادیار بیماری‌شناسی گیاهی، گروه گیاه‌پزشکی، دانشکدۀ کشاورزی، دانشگاه زابل و پژوهشکدۀ زیست‌فناوری کشاورزی دانشگاه زابل

چکیده

در این تحقیق، نقش کیتوزان به عنوان یک محرک زیستی مکانیسم دفاعی در گندم آلوده به Fusarium graminearum عامل بلایت فوزاریومی خوشۀ گندم بررسی شد. به منظور بررسی بیان ژن‌های مرتبط با بیماری‌زایی و فعالیت آنزیمی، آزمایش گلخانه‌ای به‌صورت طرح فاکتوریل در قالب طرح کاملاً تصادفی در چهار تکرار انجام گرفت. در این مطالعه محلول کیتوزان با غلظت‌های مختلف (0، 100، 200 و 500 میلی‌گرم در لیتر) به‌صورت اسپری برگی استفاده شد. گیاهان تیمارشده پس از 24 ساعت با سوسپانسیون اسپور قارچ (با غلظت 106 ماکروکنیدی در میلی‌لیتر) به روش تزریق خوشه، مایه‌زنی شده و تحت شرایط گلخانه نگهداری شدند. نمونه‌برداری در بازه‌های زمانی مختلف بعد از آلودگی انجام گرفت و سپس سطوح بیان برخی ژن‌های دخیل در مقاومت و فعالیت آنزیم‌های مرتبط بررسی شد. تجزیه و تحلیل داده‌ها کاهش شدت بیماری را در گیاهان تیمارشده نسبت به گیاه شاهد نشان داد. همچنین افزایش معناداری در فعالیت آنزیم پراکسیداز و پلی فنل اکسیداز مشاهده شد. نتایج آنالیز مولکولی به روش qRT-PCR نشان از افزایش شایان توجه سطوح بیان mRNA ژن‌های بتا- 1 و 3 گلوکانازو اگزالات اکسیداز داشت. نتایج این پژوهش نشان می‌دهد که کیتوزان با القای مقاومت سیستمیک اکتسابی مقاومت گیاهان را علیه قارچ‌های بیماری‌زا تحت تأثیر قرار می‌دهد.
 
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of chitosan on gene expression and activity of enzymes involved in resistant induction to fusariuse of wheat

نویسندگان [English]

  • Vahid Ghazimohseni 1
  • Seyed Kazem Sabbagh 2
1 M.Sc. Student of Plant Pathology, University of Zabol
2 Assistant Professor, Department of Plant Protection, Faculty of Plant Pathology, University of Zabol and Institute of Plant Biotechnology, University of Zabol
چکیده [English]

In this research, the role of chitosan as a bio-inducer of defense mechanism in infected wheat by Fusarium graminearum, the causal agent of Fusarium head blight was investigated. To investigate the expression of genes associated with pathogenicity and enzymatic activity, a factorial experiment in a completely randomized design with four replications was done under greenhouse condition. The adjusted solution containing different concentrations of chitosan (0, 100, 200 and 500 mg l-1) were used via spray. Treated plants after 24 hours with a spore suspension (at a concentration of 106 Macro conidia ml-1) were inoculated by spikelet injection and were kept under greenhouse conditions. Sampling was performed at various time points after inoculation and then the expression level of some genes involved in resistance and activity of relative enzyme was studied. Data analysis showed that disease severity was reduced in treated plants compared with control plants. Enzyme measurement showed the greatest variation for peroxidase and polyphenol oxidase enzymes. The results of molecular analysis by qRT-PCR showed significantly increased mRNA expression levels of beta-1, 3-glucanase and oxalate oxidase genes. The results of this research indicate that chitosan could influence plant resistance against pathogenic fungi through induction of systemic acquire resistance.
 
 
 

کلیدواژه‌ها [English]

  • Chitosan
  • qRT-PCR
  • head blight
  • polyphenol oxidase
  • Peroxidase
 
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