Germination and morphophysiological responses of flax (Linum usitatissimum L.) ecotypes to salinity stress

Document Type : Research Paper

Authors

Department of Genetics and Crop Production, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.

Abstract

Salinity is one of the most important factors that limit plant growth in many regions of the world. In order to evaluate the effects of salinity stress on germination, growth and some physiological characteristics of flax, two separate experiments were carried out in the laboratory and greenhouse. The experimental factors included three ecotypes of flax (Kurdistan Native, L18, E37) and four salinity levels (0, 50, 100 and 150 mM NaCl). The results showed that with increasing salinity, germination percentage, germination rate, seedling vigor index, length and dry weight of hypocotyl and radicle decreased as compared to the control. At 150 mM salinity, Kurdistan Native and E37 ecotypes had the highest and lowest germination and seedling growth, respectively. Also, salinity decreased shoot and root length, shoot and root dry weight and relative water content, whereas, increased electrolytes leakage and soluble sugars. Kurdistan Native had the highest shoot and root dry weight, relative water content and total soluble sugar at 150 mM salinity followed by L18 and E37 ecotypes. At salinity of 150 mM, Kurdistan Native had the lowest electrolyte leakage and L18 and E37 ecotypes had the highest electrolyte leakage. In general, the most sensitive and most tolerant ecotypes were E37 and Kurdistan Native, respectively. Therefore, Kurdistan Native has potential for cultivation in areas with saline water.
 

Keywords


Article Title [فارسی]

واکنش جوانه زنی و مورفوفیزیولوژیک اکوتیپ‌های کتان روغنی به تنش شوری

Authors [فارسی]

  • بتول مهدوی
  • فرناز علاسوندیاری
Abstract [فارسی]

در بسیاری از نواحی جهان شوری از مهمترین فاکتورهای محدود کننده رشد گیاه است. برای ارزیابی اثرات تنش شوری روی جوانه زنی، رشد و برخی ویژگی‌های کتان روغنی دو آزمایش جداگانه در آزمایشگاه و گلخانه انجام شد. فاکتورهای آزمایشی شامل سه اکوتیپ کتان روغنی (بومی کردستان، L18 ، E37) و چهار سطح شوری ( 0، 50، 100 و 150 میلی مولار) بودند. نتایج نشان داد که با افزایش شوری درصد جوانه‌زنی، سرعت جوانه‌زنی، بنیه گیاهچه، طول و وزن خشک ساقه‌چه و ریشه‌چه نسبت به شاهد در هر سه اکوتیپ کاهش یافت. در شوری 150 میلی مولار، اکوتیپ بومی کردستان و E37 به ترتیب بالاترین و پایین­ترین جوانه زنی و رشد گیاهچه را داشتند. همچنین شوری طول ساقه و ریشه، وزن خشک ساقه و ریشه و محتوی نسبی آب را کاهش داد درحالی که نشت الکترولیت‌ها و قندهای محلول را در هر سه اکوتیپ افزایش داد. اکوتیپ بومی کردستان بیشترین وزن خشک ریشه و ساقه، محتوی نسبی آب و قندهای محلول را داشت و بعد از آن L18 و E37 قرار گرفتند. در شوری 150 میلی مولار اکوتیپ بومی کردستان پایین­ترین و اکوتیپ­های L18 وE3 بالاترین نشت الکترولیت­ها را دارا بودند. به طور کلی، حساس‌ترین و متحمل‌ترین اکوتیپ‌ها به ترتیب E37 و بومی کردستان بودند. بنابراین، اکوتیپ بومی کردستان دارای پتانسیل برای کاشت در مناطق با آب شور است.
 
 

Keywords [فارسی]

  • پرولین
  • جوانه زنی
  • قندهای محلول کل
  • نشت الکترولیت
  • NaCl
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