ارزیابی تحمل به خشکی نهالهای دو گونه بلوط ایرانی و وی‌ول با استفاده از پارامتر‌های مرفولوژیکی، فیزیولوژیکی و جذب عناصر

نوع مقاله: مقاله پژوهشی

نویسندگان

استادیار/دانشگاه یاسوج

چکیده

خشکی از جمله تنش های محیطی مهم است که بر رشد و نمو گیاهان اثر منفی می‌گذارد و از آن جایی که جنگل‌های زاگرس با اقلیم مدیترانه‌ای جز جنگل‌های خشکی‌گرا هستند، به این منظور تاثیر تنش خشکی بر روی صفات رویشی و فیزیولوژیک و جذب عناصر در دو گونه‌ی بلوط (برودار و وی‌ول) بررسی شد. برای انجام این آزمایش، تیمار در 4 سطح کنترل و تنش خشکی اعمال شد. نتایج این مطالعه نشان داد که تنش خشکی تاثیرات منفی بر پارامتر‌های رویشی، مورفولوژیکی و فیزیولوژیکی در دو گونه بلوط مورد نظر داشت، به طوری که اکثر پارامترهای رویشی و فیزیولوژیکی کاهش یافت اما نرخ نشت الکترولیت اندامها افزایش یافت. نتایج جذب عنصر نیز نشان داد که تنش خشکی باعث افزایش میزان پتاسیم در ریشه و ساقه گردید. نتایج نشان داد که میزان شاخص تحمل نیز در گونه بلوط ایرانی در تمام پارامتر‌های مورد مطالعه به جز وزن تر و خشک برگ بیشتر از گونه وی‌ول می‌باشد. به طور کلی نتایج این تحقیق نشان داد که گونه بلوط ایرانی نسبت به گونه وی‌ول با جذب سدیم کمتر برگ و در نتیجه نسبت سدیم به پتاسیم کمتر و نیز کاهش تعداد برگ توانست مقاومت بهتری را نسبت به تنش خشکی از خود نشان دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Assesment of drought resistant of Quercus branti and ًQ. Libanii seedlings using growth, physiological and nutrient uptake

نویسندگان [English]

  • Maryam Sisakhtnejad
  • Roghayeh Zolfaghari
  • Payam Fayyaz

Assistant Professor / Yasouj University

چکیده [English]

Drought is the one of the major environmental stresses that it has a negative effect on plant growth. The Zagros forests with Mediterranean climate are dry forests, So that, for this purpose, the effect of drought stress on growth and physiological traits and nutrient uptake in two species of Quercus (Brantii and Libani) were investigated. ّFor doing this experiment, the treatment wase 4 levels includes of control and drought stress. The results showed that drought stress had negative effects on growth, morphological and physiological parameters of two oak species, so that most of parameters decreased but electrolyte leakage rate of organs were increased. Results of nutrient uptake also showed that K uptake rate of root and shoot was increased under drought stress. The results showed that stress tolerance index (STI) of Q. Brantii for all parameters except of fresh and dry weight of leaf were higher than Q. Libani. Overall, these results indicated that the Q. Brantii could show more resistant to drought stress than Q. Libani, which may be due to lower Na uptake rate of leaves and so Na/K ratio and number of leaf.

کلیدواژه‌ها [English]

  • Quercus Brantii
  • Drought stress
  • nutrient uptake
  • Quercus Libani

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