ارزیابی گلخانه‌ای مقاومت به بیماری لکه‌برگی سرکوسپورایی (Cercospora beticola) در برخی ارقام‌ چغندرقند

نوع مقاله: علمی-پژوهشی

نویسندگان

1 کارشناسی ارشد اصلاح نباتات دانشگاه محقق اردبیلی

2 دانشیار دانشگاه محقق اردبیلی

3 استاد دانشگاه محقق اردبیلی

4 استادیار دانشگاه محقق اردبیلی

10.22055/ppr.2019.14749

چکیده

لکه­ برگی سرکوسپورایی از بیماری­ های برگی مهم چغندرقند می­ باشد که در برخی مناطق خسارت­ هایی را در این محصول وارد می­ سازد. به منظور بررسی مقاومت ارقام متداول چغندرقند در مقابل این بیماری، مطالعه­ ای به صورت آزمایش فاکتوریل در قالب بلوک­ های کامل تصادفی انجام گرفت. فاکتورهای آزمایشی شامل بیماری لکه­ برگی سرکوسپورایی در دو سطح (شاهد و بیمار) و 11 رقم چغندرقند (Cesira, Lisetta, Antek, BTS 853, Merak, Yasmene, Qualita, SB16, 25447-79, 25448-79, HI 0063) بود. صفات مورد اندازه­ گیری شامل دوره نهفتگی، روز ظهور علایم، تعداد لکه، قطر لکه و درصد آلودگی بوته بود. نتایج حاصل از این بررسی نشان داد که بین مقاومت به بیماری و دوره نهفتگی و همچنین سایر صفات مورد بررسی ارتباط مستقیمی وجود داشت، به­ طوری که ارقام متحمل به بیماری، طولانی­ ترین دوره نهفتگی، کمترین تعداد لکه، کمترین درصد آلودگی بوته و رقم حساس کوتاه­ترین دوره نهفتگی، بیشترین تعداد لکه و بیشترین درصد آلودگی بوته را داشتند. بر این اساس، رقم HI 0063 به­عنوان اولین گروه در تجزیه خوشه­ ای به­ عنوان حساس­ترین رقم و ارقام SB16، 25447 و Merak در گروه چهارم به­ عنوان ارقام متحمل دسته­ بندی شدند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of resistance of some sugar beet cultivars to leaf spot (Cercospora beticola) disease under greenhouse Conditions

نویسندگان [English]

  • Z. Joudi 1
  • S. Jahanbakhsh 2
  • M. Davari 2
  • A. Ebadi 3
  • Gh. Parmoon 4
1 M. Sc. of plant breeding, University of Mohaghegh Ardabili
2 Associate professor, University of Mohaghegh Ardabili
3 Professor, University of Mohaghegh Ardabili
4 Assistant professor, University of Mohaghegh Ardabili
چکیده [English]

Background and Objectives
Leaf spot is the most important disease of sugar beet around the world. It is prevalent in areas with hot and humid weather. Damage to leaves is associated with a decrease in root and sugar content which results in lower root and white sugar yields.
Materials and Methods
This study was conducted as a factorial experiment in a completely randomized design in laboratory and greenhouse of the Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardebili in 2017. Experimental factors included Leaf spot disease in two levels (control, disease) and 11 cultivars (Cesira, Lisetta, Antek, BTS 853, Merak, Yasmene, Qualita, SB16, 25447-79, 25448-79, HI 0063) of sugar beet.
Results
Results showed a direct connection between the incubation period and the first day of the onset of symptoms. The first infected spot was recorded eight days after incubation equal to 12.26 ° C for the HI 0063 cultivar. Moreover HI 0063 cultivar had the shortest incubation period (of 137.17° C), and the shortest day of the onset of symptoms (5.9 days). The highest number of spots (405.33) was obtained by the 25748 Cultivar and smallest number of spots (18.08) was recorded by the Merak cultivar. Also the Merak cultivar had the largest stain diameter (905.1 mm), while highest percentage of plant infection (31.75%) and lowest percentage of plant infestation (27.93%) was observed by HI 0063, and SB16 cultivars respectively. The results of cluster analysis of resistance to disease showed that the cultivars were divided into 4 groups, HI 0063 cultivar in one group, Antek, 25448, Qualita and BTS 853 cultivars in another group, the cultivars of Cesira, Yasmene and Lisetta in the third group and SB16, 25447 and Merak cultivars were in the last group.
Discussion
In this study, the sensitive cultivar of HI 0063 had the shortest time for incubation period, the day of symptom emergence, the highest number of blemishes and percentage of plant infestation. The overall results of this study showed that all of the studied traits were involved in resistance except in exceptional cases, increasing degree of resistance, increased the length of the incubation period and decreased the density of the stain per unit area, the diameter of the stain, the percentage of the infected leaves and the number of spores produced in the surface of the stain. Also there was a direct connection between resistance and disease, incubation period and other traits examined. In conclusion, the resistant varieties to disease had the longest time for incubation period, the first day of symptom emergence, the lowest number of spots and percentage of plant infections. However, sensitive varieties had the shortest time for incubation period and the day of symptom emergence and the lowest number of spots and percentage of plant contamination. Accordingly, the HI 0063 cultivar was the most sensitive cultivar and SB16, 25447 and Merak cultivars were resistant cultivars.

کلیدواژه‌ها [English]

  • Sugar beet
  • resistance to disease
  • incubation period
  • stain diameter
  • percentage of plant contamination

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