نقش سیلیکون در فعالیت مولکولی ژن های ضداکسنده جو تحت تنش خشکی

نوع مقاله: علمی پژوهشی

نویسندگان

1 دانشگاه بین المللی امام خمینی (ره) - دانشکده فنی و مهندسی- گروه بیوتکنولوژی کشاورزی

2 دانشیار گروه بیوتکنولوژی کشاورزی، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین

چکیده

سیلیکون از جمله عناصری است که باعث القای مقاومت به انواع تنش‌ها به ویژه تحت تنش خشکی در گیاهان می‌شود.‌ در این پژوهش به بررسی اثر سیلیکون در فعالیت آنزیم‌های ضداکسنده کاتالاز، اسکوربات پراکسیداز و سوپراکسید دیسموتاز و الگوی بیانی ژن‌های مربوطه و محتوای هیدروژن پراکساید بر روی دو رقم نیمروز (مقاوم به خشکی) و گرگان (رقم نیمه حساس) در مرحله چهار برگی، تحت سه تیمار خشکی، سیلیکون-خشکی و شاهد به صورت فاکتوریل در قالب طرح کاملا تصادفی با سه تکرار در گلخانه پرداخته شد. بر اساس نتایج تجزیه، میزان فعالیت آنزیم CAT تحت تنش خشکی در رقم حساس کاهش و تیمار سیلیکون در هر دو رقم باعث افزایش آن گردید. در صورتیکه فعالیت دو آنزیم دیگر (آسکوربات پراکسیداز و سوپراکسید دیسموتاز) در اثر تنش خشکی افزایش یافته و تیمار سیلیکون باعث تشدید فعالیت آن‌ها نسبت به شاهد شد. الگوی بیان ژنی فعالیت این آنزیم‌ها مشابه با تغییرات آنزیمی آنها بود. از نتایج حاصل از این آزمایش می‌توان چنین نتیجه گرفت که نقش سیلیکون در افزایش تحمل به تنش خشکی در گیاه جو بدلیل افزایش فعالیت آنزیم‌های ضداکسنده و تشدید بیان ژن‌های مسئول پاسخ به تنش بوده و احتمالا باعث کاهش آسیب‌های ناشی از فعالیت گونه‌های فعال اکسیژن حاصل تحت تنش خشکی شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Silicon role in molecular activity of barley antioxidant genes under drought stress

نویسندگان [English]

  • Roya Heidari 1
  • Raheem Haddad 2
1 M.Sc. in Agricultural Biotechnology, Imam Khomeini International University. Qazvin, Iran
2 Associated Professor, Agricultural Biotechnology Department, Imam Khomeini International University, Qazvin, Iran.
چکیده [English]

Silicon is accounted as one of the elements that induces resistance to different kinds of stresses especially drought stress in plants. In this study, the effect of silicon was analyzed on the activity of antioxidant enzymes Catalase, Ascorbate peroxidase and Superoxide dismutase and also related genes expression pattern and H2O2 content on two varsities, NIMROOZ (drought resistant) and GORGAN (semi-resistant) under three treatments of drought, silicon-drought and control in a completely randomized design with three replications in four leaf developmental stage in a green house. Based on the results of factorial test, catalase activity was decreased in semi-sensitive varity and silicon treatment increased such activity in both varieties under drought stress. While the activity of two other enzymes (Ascorbat peroxidase and Superoxide dismutase) was increased under drought stress and silicon treatment intensified their activity in comparison with control. Their pattern of gene expression changed in a similar way of enzyme activity. It might be concluded that, the role of silicon in enhancing drought tolerance in barley plant is because of increasing activity of antioxidant enzymes and expression of stress responsible genes, and therefore, causes reduction in activity of reactive oxygen spices produced under drought stress.

کلیدواژه‌ها [English]

  • Antioxidants enzymes
  • Gene expression
  • Drought stress
  • Barley
  • Silicon
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