Changes in growth and essential oil content of dill (Anethum graveolens) organs under drought stress in response to salicylic acid

Document Type : Research Paper

Authors

1 Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

2 Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

Abstract

 
Some of the harmful impacts of water shortage on crop performance may be alleviated by growth regulators such as salicylic acid. So, an experiment was arranged as a split-plot design based on randomized complete blocks in three replicates to assess changes in essential oil content of dill (Anethum graveolens L.) organs in response to water availability (water supply after 70, 100, 130, 160 mm evaporation as normal watering and mild, moderate and severe stresses, respectively), and salicylic acid (SA) levels (water spray and 0.6, 1.2 mM SA). Irrigation levels and salicylic acid treatments were assigned to the main and sub-plots, respectively. The results showed that chlorophyll a and especially chlorophyll b decreased with increasing drought stress. The ground green cover and plant organ masses (leaves and stem, flowers, and seeds) were only decreased under severe water deficit. Essential oil percentage of dill organs increased with increasing water deficit up to moderate stress, but thereafter it was decreased as water deficit severed. The highest essential oil yield of the vegetative parts and flowers was also produced in moderately stressed plants, but the greatest essential oil yield of seeds was recorded under mild water deficit. Exogenous salicylic acid enhanced the essential oil percentage of all dill organs, especially under moderate water limitation. The essential oil yield of dill organs was also increased by the salicylic acid treatment. The application of 1.2 mM salicylic acid was more effective in improving essential oil production of dill.

Keywords


Article Title [Persian]

تغییرات رشد و محتوای اسانس اندام های شوید (Anethum graveolens) تحت تنش خشکی در واکنش به سالیسیلیک اسید

Authors [Persian]

  • کاظم قاسمی گلعذانی 1
  • رقیه صلحی خواجه مرجان 2
1 گروه اکوفیزیولوژی، دانشکده کشاورزی، دانشگاه تبریز، تبریز.
2 گروه اکوفیزیولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز، تبریز
Abstract [Persian]

برخی از اثرات مضر محدودیت آب بر عملکرد گیاه زراعی ممکن است توسط تنظیم­ کننده ­های رشد مانند سالیسیلیک اسید کاهش یابد. بنابراین، آزمایشی به صورت کرت­ های خرد­شده  در قالب طرح بلوک­ های کامل تصادفی در سه تکرار برای ارزیابی تغییرات محتوای اسانس اندام ­های شوید (Anethum graveolens L.) در واکنش به فراهمی آب (تأمین آب پس از 70، 100، 130 و 160 میلی­ متر تبخیر به ترتیب به عنوان آبیاری معمول و تنش ­های ملایم، متوسط ​​و شدید) و سطوح سالیسیلیک اسید (آب ­پاشی و 6/.، 1/2 میلی مولار سالیسیلیک اسید) ترتیب داده شد. فواصل آبیاری و تیمار­های سالیسیلیک اسید به ترتیب به کرت­ های اصلی و فرعی اختصاص داده شدند. نتایج نشان داد که کلروفیل a و به ویژه کلروفیل b با افزایش تنش خشکی کاهش یافته ­اند. پوشش سبز زمین و وزن اندام ­های گیاه (شاخه و برگ، گل ­ها و بذرها) فقط تحت کمبود شدید آب کاهش یافتند. درصد اسانس اندام ­های شوید با افزایش کمبود آب تا تنش متوسط فزونی یافت، اما پس از آن با تشدید کمبود آب کم شد. بیشترین محصول اسانس بخش­ های رویشی و گل­ ها نیز در گیاهان با تنش متوسط تولید شد، اما بیشترین محصول اسانس بذرها تحت کمبود ملایم آب ثبت گردید. کاربرد خارجی سالیسیلیک اسید درصد اسانس همه اندام­ های شوید را، به ویژه تحت محدودیت متوسط آب، افزایش داد. محصول اسانس اندام ­های شوید نیز با تیمار سالیسیلیک اسید افزایش یافت. کاربرد 1/2 میلی ­مولار سالیسیلیک اسید در بهبود تولید اسانس شوید مؤثرتر بود. 
 

Keywords [Persian]

  • کلروفیل
  • شوید
  • اسانس
  • پوشش سبز
  • سالیسیلیک اسید
  • تنش آبی
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