غربالگری ارقام خیار مقاوم به سفیدک پودری و بررسی مقایسه‌ای فلورسانس کلروفیل در ارقام حساس و مقاوم

نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 دانشگاه کشاورزی ومنابع طبیعی رامین خوزستان

چکیده

خیار یکی از اقتصادی‌ترین صیفی‌جات تولیدی در ایران است که به شدت توسط سفیدک پودری مورد هجوم قرار می‌گیرد. یکی از مؤثرترین راه‌های کنترل اپیدمی این بیماری شناسایی و کاربرد ژنوتیپ‌های مقاوم به بیماری است. در مطالعه حاضر تعداد 23 رقم خیار گلخانه‌ای و مزرعه‌ای از نظر مقاومت به سفیدک پودری غربالگری شده و ارقام مقاوم بر اساس برآورد درصد شاخص بیماری (PDI) شناسایی شدند. در ادامه فلورسانس کلروفیل برگ در 5 رقم از گروه‌های مقاوم، نیمه مقاوم و حساس برآورد و مورد تجزیه و تحلیل قرار گرفت. بر اساس نتایج برآورد شاخص بیماری، اختلاف قابل ملاحظه‌ای از نظر مقاومت به این بیماری در بین ارقام مشاهده شد به طوری که در چهار گروه مقاوم، نیمه مقاوم، نیمه حساس و حساس دسته‌بندی شدند. دو رقم گلخانه‌ای CLE و Green Magic به ترتیب با شاخص بیماری 78/7 و 33/8 مقاوم‌ترین و دو رقم مزرعه‌ای Beit Alpha و SuperN3 به ترتیب با شاخص بیماری 11/31 و 67/31 حساس‌ترین ارقام شناخته شدند. در تجزیه واریانس شاخص‌های فلورسانس کلروفیل، اثر بیماری بر 3 شاخص فلورسانس حداقل (Fo)، فلورسانس متغیر (Fv) و شاخص سرزندگی گیاه (Fv/Fm) و اثر رقم بر شاخص Fo معنی‌دار بود (P

کلیدواژه‌ها

عنوان مقاله [English]

Screening of Cucumber Cultivars Resistant to Powdery Mildew and Comparative Assessment of Chlorophyll Florescence in Resistant and Sensitive Cultivars

نویسندگان [English]

  • Namdar Moradi 1
  • Heshmatollah Rahimian 1
  • Ali Dehestani 1
  • Valiollah babaeizad 1
  • Yaser Yaghoubian 2
1 Sari University of agricultural sciences and natural resources
2 Ramin agriculture and natural resources of Khouzestan
چکیده [English]

Cucumber is one of the economically important vegetables in Iran which is extensively attacked by powdery mildew. Identification and application of disease resistant genotypes is an efficient method to escape the disease epidemic. A number of 23 greenhouse and field cucumber cultivars were evaluated and screened for powdery mildew resistance and putative resistant cultivars were identified based on percent Disease Index (PDI) measurement. In addition, leaf chlorophyll fluorescence was measured and analyzed in 5 cultivars selected from resistant, semi-resistant and sensitive groups. Based on the results of PDI measurements, a considerable variation between the cultivars was observed so that the cultivars classified to four groups including resistant, semi-resistant, semi susceptible and susceptible. Two greenhouse cultivars i.e. CLE and Green Magic with the PDIs of 7.78 and 8.33 were the most resistant and the two field cultivars Beit Alpha and SuperN3 with the PDIs of 31.11 and 31.67 were the most susceptible cultivars. Based on the ANOVA of chlorophyll florescence parameters, a significant infection effect on minimal florescence (Fo), variable florescence (Fv) and vitality index (Fv/Fm) and a significant genotype effect on Fo parameters was observed (P

کلیدواژه‌ها [English]

  • Cucumber
  • Powdery Mildew
  • Photosynthesis
  • photosystem II
  • vitality index

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