پاسخ برخی توده‌های هندوانه به سطوح مختلف تنش کم‌آبی ناشی از پلی‌اتیلن گلیکول

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

2 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

چکیده

به‌منظور بررسی پاسخ پنج تودۀ هندوانه (TN.93.765، TN.93.469، TN.93.485،  TN.93.425و TN.93.330) به تنش خشکی، آزمایشی به‌صورت فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با سه تکرار انجام شد. این تحقیق در محیط آبکشت (هیدروپونیک) با چهار سطح مختلف پتانسیل اسمزی ناشی از پلی‌اتیلن گلیکول6000 شامل 0 (شاهد)، 4/0-، 8/0-، 2/1- مگاپاسکال بررسی شد. بر پایۀ نتایج به‌دست‌آمده در بین توده­های هندوانه تفاوت معنی‌داری مشاهده شد. توده­های  TN.93.765و TN.93.485 کمترین کاهش وزن تر، خشک و سطح برگ و بیشترین میزان رنگیزه­های نورساختی (فتوسنتزی) را در سطح تنش شدید (Mpa2/1-) به خود اختصاص دادند. میزان رنگدانه‌های سبزینه (کلروفیل) و کاروتنوئید با افزایش میزان پتانسیل اسمزی تا سطح 8/0- افزایش تدریجی نشان داد اما در سطح تنش 2/1- میزان آن‌ها کاهش یافت. در بین توده‌های موردبررسیTN.93.765  از اصفهان و TN.93.485 از خراسان بیشترین مقدار پرولین، فنل کل و ارزش پاداکسندگی (آنتی‌اکسیدانی) را در سطح تنش شدید به خود اختصاص دادند. با توجه به نتایج به‌دست‌آمده می‌توان استنباط کرد که این توده­ها به شرایط تنش خشکی در مقایسه با توده­های دیگر متحمل‌تر هستند.

کلیدواژه‌ها


عنوان مقاله [English]

Response of some watermelon accessions to water deficiency stress induced by poly ethylene glycol

نویسندگان [English]

  • Zahra Mohammadzadeh 1
  • Forouzandeh Soltani 2
1 Former M. Sc. Student, University College of Agriculture & Natural Resources, University of Tehran, 31587, Karaj, Iran
2 Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, 31587, Karaj, Iran
چکیده [English]

In order to study the response of five watermelon accessions (TN.93.765, TN.93.469, TN.93.485, TN.93.425 and TN.93.330) to drought stress an experiment was conducted as factorial experiment in Randomized Completely Block Design with three replications. This research were investigated in hydroponic system with four levels of osmotic potential induced by poly ethylene glycol 6000 (PEG) including 0 as control, -0.4, -0.8 and -1.2 MPa. Based on results among accessions remarkable differences were observed. Accessions of TN.93.765 and TN.93.485 revealed the lowest reduction in fresh and dry weight and leaf area and also the highest amount of photosynthetic pigments at severe stress condition (-1.2 Mpa). Amount of chlorophyll and carotenoid pigments gradually increased with increasing osmotic potential up to -0.8Mpa but reduced at -1.2 Mpa. Accessions of TN.93.765 from Isfahan and TN.93.485 from Khorasan obtained maximum amount of proline, total phenolic compound and antioxidant capacity in severe stress condition. Based on the results we could demonstrate that these accessions were more tolerable to drought stress in comparison with others.

کلیدواژه‌ها [English]

  • osmotic potential
  • phenolic compound
  • photosynthetic pigment
  • proline
  • Watermelon
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