In vitro evaluation of drought tolerance in two grape (Vitis vinifera L.) cultivars

Document Type : Research Paper


Department of Horticultural Science, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran


Abiotic stresses pose a major threat to agriculture. Therefore, developing plants that are more tolerant of these stresses is very important for improving crop productivity. Grapevines (Vitis vinifera L.) is an important fruit crop cultivated in the world. An in vitro experiment was designed to study the response of ‘White Seedless’ and ‘Flame Seedless’ cultivars of Vitis to drought stress. Treatments included four concentrations of PEG 6000, i.e., 0, 0.5, 1, and 2% (w/v), which were equivalent to 0, -0.035, -0.07, and -0.14 times the water potential, respectively. The single-node explants of Vitis grown on MS medium, supplemented with growth regulators BA (2 mg/l), NAA (0.2 mg/l), sucrose (30 g/l), agar (7 gr), and activated charcoal )200 mg/l), were transferred to the same medium but with different concentrations of PEG for 30 days. The results showed that the Flame Seedless cultivar had better growth characters than the White Seedless cultivar on the average of PEG concentrations. Flame Seedless also managed drought stress in terms of shoot length, the number of leaves per shoot, dry weight, chlorophyll a, chlorophyll b, and soluble carbohydrates more efficiently than White Seedless, and produced a high percentage of callus (87.5%) at the 1% PEG stress level. Although the White Seedless cultivar was not more vigorous than Flame Seedless but showed significantly higher proline content, non-significant reduction in relative water content, and a slightly lower reduction in shoot length, and fresh weight at 2% PEG as compared to the control. It seems that both grapevine varieties succeeded in dealing with the PEG drought stress with their special mechanisms. 


Article Title [Persian]

ارزیابی واکنش دو رقم انگور (Vitis vinifera L.) به تنش خشکی در شرایط درون درون شیشه ای

Authors [Persian]

  • فاطمه شیرازی
  • منصور غلامی
  • حسن ساریخانی
گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان
Abstract [Persian]

تنش ­های غیر زنده تهدیدی بزرگ برای کشاورزی به حساب می ­آیند. بنابراین، تولید گیاهان متحمل به تنش از اهمیت زیادی در افزایش بهره ­وری برخوردار است. انگور (Vitis vinifera L.) یکی از گیاهان خوراکی مهم تحت کشت در سراسر جهان است. به منظور بررسی واکنش دو رقم انگور، بیدانه سفید و فلیم سیدلس، به تنش خشکی، آزمایشی در شرایط درون شیشه­ ای طراحی شد. عامل دوم شامل چهار غلظت 0، 0/05، 1 و 2 درصد پلی اتیلن گلیکول 6000 بود. این غظت­ ها به ترتیب معادل 0، 0.035-، 0/07- و 0/14- بار پتانسیل آب بودند. ریزنمونه­­ های تک گره ­ای انگور رشد یافته در محیط موراشیگ و اسکوک با تنظیم کننده ­های بنزیل آدنین  (2 میلی گرم در لیتر)، نفتالین استیک اسید (0/2  میلی گرم در لیتر)، ساکارز (30 گرم در لیتر)، آگار (7 گرم) و ذغال فعال (200 میلی گرم در لیتر)، پس از استقرار کامل به محیط کشت مشابه ولی با غلظت ­های مختلف پلی اتیلن گلیکول به مدت 30 روز منتقل شدند. نتایج نشان داد که رقم فلیم سیدلس از ویژگی ­های رشد بهتری نسبت به رقم بیدانه سفید در متوسط غلظت­ های PEG برخوردار بود. فلیم سیدلس همچنین تنش خشکی را از نظر طول شاخساره، تعداد برگ در شاخساره، وزن خشک ریزنمونه، کلروفیل a، کلروفیل b و کربوهیدرات­ های محلول به طور موثرتر از رقم بیدانه سفید مدیریت کرد و از درصد بالای کالوس (87/5 درصد) در غلظت 1 درصد PEG  برخوردار بود.. اگرچه رقم بیدانه سفید از نظر ویژگی­ های رشدی قوی‌تر از فلیم سیدلس نبود، ولی محتوای پرولین  بالاتر معنی‌دار، کاهش غیرمعنی‌دار در محتوای آب نسبی و کاهش اندکی در طول ساقه و وزن تر ریزنمونه‌ها در غلظت 2 درصد PEG نسبت به شاهد نشان داد. به نظر می­ رسد هر دو رقم انگور با سازوکارهای ویژه خود موفق به مقابله با تنش خشکی PEG شده ­اند.

Keywords [Persian]

  • انگور
  • پلی اتیلن گلیکول
  • تنش خشکی
  • کشت درون شیشه ای
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