تنوع بیماریزایی در جمعیت های قارچ (Lib.) de Bary Sclerotinia sclerotiorum در گیاهان روغنی در شمال و شمال غرب کشور

نوع مقاله: مقاله کامل پژوهشی

نویسندگان

1 مسئول مکاتبه

2 نویسنده

چکیده

پوسیدگی طوقه آفتاب گردان با عامل Sclerotinia sclerotiorumیکی از بیماری های مهم در شمال غرب کشور است که با جوانه زنی میسلیوژنیک سختینه ها سبب آلودگی میزبان می شود. در مقابل، در شمال کشور آلودگی ساقه کلزا به طریقه جوانه زنی کارپوژنیک از طریق آسکوسپورهای هوازی صورت می گیرد. این پژوهش به منظور مقایسه بیماریزایی جدایه هاییاز جمعیت های قارچ در مزارع آفتاب گردان و کلزا در مناطق فوق انجام شد. تنوع در بیماریزایی جدایه ها با استفاده از روش مایه زنی با قرص میسلیومی و اندازه گیری محل زخم انجام  شد. نتایج  نشان داد که تفاوت معنی داری (P<0.001) بین گروه های سازگار رویشی در جمعیت های این قارچ در شمال و شمال غرب کشور در بیماریزایی جدایه های مورد مطالعه وجود دارد. جدایه های متعلق به MCG هایی که از مکان های مختلف جداسازی شده بودند مانند MCG56،از نظر بیماریزایی در سطح یک درصد تفاوت معنی داری داشتند. ولی در بیشتر موارد جدایه هایی که از یک محل جداسازی شده بودند، مانندMCGs 17, 28, 42, 51and 64  از نظر بیماریزایی تفاوت معنی داری نداشتند.

کلیدواژه‌ها


عنوان مقاله [English]

Diversity of aggressiveness of Sclerotinia sclerotiorum (Lib.) de Bary populations in oil plants fields of north and northeast of Iran.

نویسندگان [English]

  • hoseein irani 1
  • mohamad javan nikkhah 2
  • agha vali ebrahim af 2
  • asghar heidari 2
چکیده [English]

Sclerotinia sclerotiorum in which the infection is occurred by myceliogenic activity of sclerotia. In contrast, in the northern regions of the country, Sclerotinia stem rot is the most destructive disease on canola and the fungus germinates carpogenically to produce airborne ascospores. This study was conducted to compare aggressiveness of isolates of S. sclerotiorum populations in the above-mentioned areas in sunflower and canola fields. Variation in aggressiveness of isolates was assessed using mycelial plug inoculation technique and the measurement of lesion development was used to compare aggressiveness among isolates. Highly significant differences in aggressiveness were found among MCGs (P<0.001) from the north and northwest of Iran. The isolates belonging to MCGs such as MCG 56 which collected from different areas, showed significant differences of aggressiveness (P<0.001). But the isolates belonging to MCG17, MCG28, MCG42, MCG51 and MCG 64 which obtained from the same location in canola and sunflower fields, did not show significant differences of aggressiveness

کلیدواژه‌ها [English]

  • Sclerotinia rot
  • MCG
  • Canola
  • sunflower
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