تأثیر اسید سالیسیلیک بر ویژگی‌های فیزیولوژیکی و مورفولوژیکی چمن لولیوم (Lolium perenne cv. Numan) تحت تنش خشکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکدۀ کشاورزی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران

2 استاد گروه علوم باغبانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

3 استادیار، دانشکده کشاورزی، دانشگاه زنجان

چکیده

چمن لولیوم یا رای گراس چندساله گیاهی با نام علمی Lolium perenne L. از خانوادۀ گندمیان است که در طراحی فضای سبز اهمیت بسیاری دارد. هدف از انجام این پژوهش، بررسی تأثیر غلظت­های مختلف اسید سالیسیلیک بر بهبود برخی از ویژگی­های رشدی و بیوشیمیایی گیاه لولیوم تحت تنش خشکی بود. آزمایش به‌صورت فاکتوریل در قالب طرح کامل تصادفی با چهار تکرار اجرا شد. تیمار­های موردبررسی در این آزمایش، اسید سالیسیلیک در سه سطح (0، 75/0 و 5/1 میلی‌مولار) و تنش خشکی در سه سطح (50، 75 و 100 درصد ظرفیت زراعی) بود. نتایج نشان داد تنش خشکی سبب افزایش میزان نشت یونی و تجمع پرولین شده اما میزان سبزینه (کلروفیل)، محتوای نسبی آب و میزان وزن خشک‌ریشه و رشد شاخساره را کاهش داد. کاربرد برگی اسید سالیسیلیک تحت تنش خشکی در 5/1 میلی‌مولار، میزان سبزینه و محتوای نسبی آب را افزایش و نشت یونی و تجمع پرولین را کاهش داد. همچنین بالاترین میزان وزن خشک‌ریشه و رشد شاخساره از پاشش اسید سالیسیلیک در غلظت 75/0 میلی‌مولار به دست آمد. با توجه به نتایج به‌دست‌آمده، کاربرد برگی تیمار­های اسید سالیسیلیک توانست اثرگذاری‌های منفی ناشی از تنش خشکی را بر شاخص­های رشدی و بیوشیمیایی چمن لولیوم بهبود بخشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Salicylic acid on physiological and morphological characteristics of Lolium perenne cv. Numan under drought stress

نویسندگان [English]

  • Seyedeh Mahsa Hosseini 1
  • Mohsen Kafi 2
  • Masoud Arghavani 3
1 Master,Master ,Department of Horticulture Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 Professor, Department of Horticultural Sciences, University of Tehran.
3 Assistant prof, Department of Horticultural Sciences, University of Zanjan
چکیده [English]

Perenial Rygrass (Lolium perenne cv. “Numan”)belongs to Poaceae family as an important lawn in landscape design. The objective of this research was to evaluate effects of different concentrations of salicylic acid to enhance the growth and biochemical characteristics of Lolium perenne L. under drought conditions. Factorial experimental design was arranged in a completely randomized block design with four replications. Treatments consist of SA at 3 levels (0, 0.75 and 1.5 mM) and drought stress at 3 levels (50, 75 and 100 % FC). Results showed that drought stress increased the electrolyte leakage and proline accumulation, however decreased chlorophyll rate, relative water contents, root dry weight and shoot growth. Foliar application of SA at the 1.5 mM increased chlorophyll rate and relative water content, but decreased electrolyte leackage and proline accumulation under drought stress. SA application also resulted in highest root dry weight and shoot growth at the 0.75 mM. Based on the present results, foliar application of SA treatments can ameliorate the negative effects of drought stress on the growth and biochemical characteristics of Lolium perenne cv. “Numan”.

کلیدواژه‌ها [English]

  • Chlorophyll
  • electrolyte leakage
  • proline
  • relative water contents
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