نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد بیوتکنولوژی کشاورزی، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه لرستان، خرم‌آباد، ایران

2 استاد، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه لرستان، خرم‌آباد، ایران

3 استادیار، گروه کشاورزی، دانشگاه پیام‌نور، تهران، ایران

4 استادیار، گروه بیوتکنولوژی، پژوهشکده گیاهان دارویی جهاد دانشگاهی، کرج، ایران

5 استادیار، گروه اصلاح نباتات، دانشکده کشاورزی، دانشگاه پیام‌نور، تهران، ایران

چکیده

چکیده
این آزمایش با هدف بررسی بیان ژن‌های دخیل در مسیر بیوسنتز مونوترپن‌ها و برخی صفات مورفولوژی (شامل وزن تر ریشه و اندام هوایی، ارتفاع بوته، طول ریشه و تعداد ساقه جانبی) در قالب طرح بلوک‌های کامل تصادفی با 4 تیمار شامل شرایط 100 درصد (T1، شاهد)، 70درصد (T2، تنش ملایم)، 40 درصد (T3، تنش متوسط) و 20 درصد (T4، تنش شدید) ظرفیت مزرعه‌ای در گلخانه تحقیقاتی پژوهشکده گیاهان دارویی جهاد دانشگاهی کرج در سال ۱۳۹۴ اجرا گردید. نتایج حاصل از صفات مورفولوژی نشان داد که با افزایش تنش کم‌آبی وزن تر ریشه، وزن تر اندام هوایی، ارتفاع بوته، طول ریشه و تعداد ساقه‌های جانبی کاهش یافت. نتایج بررسی بیان ژن‌ها نشان داد که بیشترین میزان بیان ژن‌های TPS2 و HMGR و بیشترین میزان تیمول و کارواکرول در تیمار T2 حاصل شد. روند تغییرات بیان ژن‌های TPS2 و HMGR با روند تغییرات میزان مونوترپن تیمول و کارواکرول در همه تیمارها مشابه بود؛ به‌طوری‌که بیشترین میزان مونوترپن‌ها و بیان ژن‌های TPS2 و HMGR در تیمار T2 و سپس در تیمار T1 مشاهده شد و کمترین نیز در تیمارهای T3 و T4 حاصل شد. در مجموع با توجه به نتایج حاصل از این پژوهش، تنش ملایم بر افزایش بیان ژن‌های TPS2 و HMGRمؤثر بود و منجر به تولید بیشتر مونوترپن‌ها گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Study on Gene Expression of 3-Hydroxy-3-Methylglutaryl-Coa Reductase (HMGR) and γ-Terpinene Synthesis in Thymus Vulgaris L. Under Water Deficit Stress

نویسندگان [English]

  • Fatemeh Mirzaei 1
  • Ahmad Ismaili 2
  • Foad Fatehi 3
  • Ardeshir Ghaderi 4
  • Soheila Afkar 5

1 M.Sc. Student of Agricultural Biotechnology, Department of Plant Breeding, Faculty of Agriculture, Lorestan University, Khorramabad, Iran

2 Professor, Department of Plant Breeding, Faculty of Agriculture, Lorestan University, Khorramabad, Iran

3 Assistant Professor, Department of Agriculture, Payame Noor University, Tehran, Iran

4 Assistant Professor, Department of Plant Breeding, Institute of Medicinal Plant Research, Jahad Daneshgahi, Karaj, Iran

5 Assistant Professor, Department of Plant Breeding, Faculty of Agriculture, Payame Noor University, Tehran, Iran

چکیده [English]

Abstract
 
Background and Objectives
Drought is a major abiotic stress that limits agricultural crop production. Thyme (Thymus vulgaris L.) is an aromatic and medicinal plant which is very important for the herbal industry. This study was aimed to investigate the variation some of the secondary metabolites and morphological traits as well as changes in expression of genes involved in the biosynthesis of thymol (including HMGR and TPS2) by real-time PCR. One of the main goals of the present study was to find out the relationship between the transcript of these genes and related metabolites in thyme.
 
Materials and Methods
This study was conducted in the greenhouse of Iranian Institute of Medicinal Plants of Jahad Daneshgahi (Karaj, Iran) in 2016. The experimental design was a randomized complete block design with 5 replication and 4 water deficit stress treatments, including 100% (T1, control), 70% (T2, mild stress), 40% (T3, moderate stress), and 20% (T4, severe stress) of field capacity (FC). Total RNA was extracted from leaves using TRIzol reagent following the manufacturer’s instructions. First strand synthesis of cDNA was performed immediately using 1 µg of total RNA with simultaneous use of oligo-dT (50 µM) primers and random hexamer and reverse transcriptase enzyme following the manufacturer protocol. In order to examine gene expression by real-time PCR, the method of fluorescence dye SYBR green (Fermentase, USA) was used. The amount of thymol and carvacrol were measured by HPLC.
 
Results
Results of morphological traits showed that increasing the water deficit stress caused a decrease in root biomass, shoot fresh weight, plant height, root length, and the number of side branches. Results of gene expression profiling showed that the highest expression of TPS2 and HMGR genes and the highest amount of thymol and carvacrol was obtained in treatment T2 (70% FC).
 
Discussion
TPS2 and HMGR gene expression changes were similar to the changes of monoterpenes thymol and carvacrol in all treatments and the highest number of monoterpenes and gene expression were obtained in mild water deficit stress treatment in comparison with control, moderate, and severe stresses. Altogether, according to the results of this study, mild stress had a significant effect on increasing the expression of HMGR and TPS2 and led to a higher production of monoterpenes.
 

کلیدواژه‌ها [English]

  • Carvacrol
  • Morphological traits
  • Thymol
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