ببیان ژن‌های کیتیناز، بتا- 1 و 3 گلوکوناز و پراکسیداز در برنج تحت تیمارهای قارچ عامل بیماری سوختگی غلاف، باکتری‌های آنتاگونیست و القاءکننده مقاومت و سیلیکات پتاسیم

نوع مقاله: بیماری‌شناسی گیاهی

نویسندگان

1 گروه گیاهپزشکی دانشگاه فردوسی مشهد

2 عضو هیئت علمی دانشگاه

10.22092/jaep.2019.125350.1272

چکیده

سوختگی غلاف برنج ناشی ازقارچ Rhizoctonia solani AG-1 IA به‌عنوان یکی از عوامل خسارت‌زای مهم در بسیاری از مناطق برنج‌کاری دنیا شناخته شده است. این تحقیق با هدف بررسی اثر دو جدایه باکتری آنتاگونیست و القاء‌کننده مقاومت از گونه Pseudomonas protegenesبه‌تنهایی و در تلفیق با سیلیکات پتاسیم بر تغییرات بیان ژن و تولید آنزیم‌های کیتیناز، گلوکونازو پراکسیداز انجام شد. پس از اعمال تیمارها، در زمان‌های صفر، 6، 12، 24، 48 و 72 ساعت بعد از مایه­ زنی گیاهچه‌های برنج (رقم فجر) با قارچ عامل بیماری، از غلاف و برگ نمونه‌برداری شد. 1000 و 200 میلی‌گرم از پودر غلاف و برگ نیتروژن مایع به‌ترتیب در بافرهای استات سدیم و فسفات برای اندازه‌گیری آنزیم‌های کیتیناز،
بتا- 1 و 3 گلوکوناز و پراکسیداز و 100 میلی گرم از آن درRNX-plus solution برای استخراج RNA، استفاده شد. میزان تولید آنزیم بتا 1 و 3 گلوکوناز در 72 ساعت و آنزیم کیتیناز در زمان 48 ساعت پس از مایه‌زنی در حداکثر مقدار خود بود. باتوجه به این‌که بیان ژن‌های کیتیناز و پراکسیداز در تیمار باکتری آنتاگونیست در تلفیق با سیلیکات پتاسیم نسبت به سایر تیمارها در زمان اولیه فرآیند بیمارگری یعنی 6 ساعت پس از مایه‌زنی با بیمارگر در بالاترین سطح مشاهده شده و ژن بتا 1 و 3 گلوکوناز در فاصله زمانی 24 ساعت به‌حداکثر بیان خود رسید، لذا این تیمار به‌عنوان بهترین تیمار در تحریک واکنش دفاعی گیاه شناسایی شد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Genes expression of chitinase, β- 1, 3- gluconase and peroxidase enzymes in rice treated with the causal agent of sheath blight diseases, antagonistic and inducer bacteria, and potassium silicate

نویسندگان [English]

  • Mahdi Rostami 1
  • Saeed Tarighi 1
  • Parissa Taheri 1
  • Heshmatollah Rahimian 2
1 Department of Crop protection, Ferdowsi university of Mashhad
2 Department
چکیده [English]

Rice sheath blight disease caused by Rhizoctonia solani AG-1 IA has been recognized as a major damaging factor in many rice regions of the world. The aim of this research was investigatingon the effect of two isolates of Pseudomonas protegenes, antagonistic and inducer isolates alone and in combination with potassium silicate on expression rate and production of chitinase, β- 1, 3- gluconase and peroxidase enzymes at 0, 6, 12, 24, 48 and 72 hours after inoculation of Fajr cultivar with the causal agent of rice sheath blight disease.The amount of 1000 and 200 mg of sheath- leaf tissue was prepared as powdered in liquid nitrogen and thenin sodium acetate and phosphate buffers respectively to measure chitinase, β- 1, 3- gluconase and peroxidas eenzymes and 100 mg of the powder in RNAX-Plus solution to study the genes expression and RNA extraction. The amount of β- 1, 3- gluconas eenzyme in 72 hours and chitinase enzyme in 48 hours of infection was at maximum level. As regards, compared with other treatments, the highest level of expression of the genes for chitinase and peroxidase was observed in treatment of antagonistic bacteria in combination with potassium silicate in the early hours of the pathological process, 6 hours after inoculation with the fungal agent, and β- 1, 3- gluconase reached the maximum at 24 h, Thus this treatment recognized as the best treatment.

کلیدواژه‌ها [English]

  • biological control
  • Enzyme activity
  • Rhizoctonia solani AG-1 IA

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